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Choudhury, Sharmila. "Mate choice in Barnacle geese." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306596.
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Smith, Pauline Anne. "Hormonal regulation of barnacle development." Thesis, Royal Holloway, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300467.
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Hyder, Kieran. "Barnacle demography : a matrix modelling approach." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285626.
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Gude, Adrian R. "Assessment and implications of the supply of Semibalanus balanoides (L.) larvae to shores in Fife, East Scotland." Thesis, University of St Andrews, 2007. http://hdl.handle.net/10023/164.
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Investigations into the supply, settlement and recruitment of the barnacle Semibalanus balanoides (L.) to shores in Fife, East Scotland were undertaken over three consecutive years (2004 – 2006). Several designs of a passive larval trap, based on earlier published designs, were employed to quantify the delivery (supply) of cyprids to the substratum. Pump samples from the water column were collected to provide a measure of intertidal cyprid concentration. Cyprid concentration was found to exhibit both spatial and temporal variation, but was also found to be significantly correlated with cyprid supply, as quantified by the traps. In some years, pump and trap samples suggested that cyprid abundance in the intertidal was mediated by wind-driven processes. An artificial substratum was used to quantify cyprid settlement, allowing investigations into the supply-settlement relationship. Supply and settlement were found to be two very distinct biological phases. Supply describes the flux of larvae to the substratum. Settlement provides a measure of the amount of larvae that decide to settle on the substratum, as initial attachment for barnacle larvae is not permanent. Whilst supply saturation is unfeasible, daily saturation of the substratum by settlers was observed at many sites along the Fife coast. Levels of settlement saturation were found to vary both temporally, between years, and spatially, over scales of km. Varying levels of the desperation of larvae to settle, mediated by dwindling energy reserves, was thought to explain some of this variation. The supply data also provided some evidence of the possible movement of cyprids along the Fife coast from Fife Ness to Tentsmuir. However, wind-induced transport may also play a dominant role on the Fife coast. A comparison of supply and recruitment of larvae into adult populations revealed that both pre- and post-settlement events may influence recruitment. The relative importance of these factors was shown to be density-dependent. Negative intraspecific interactions were only seen in denser aggregations of adults. In less crowded aggregations, recruitment reflected initial patterns of larval supply.
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Leone, Stacy E. "Predator induced plasticity in barnacle shell morphology /." Abstract Full Text (HTML) Full Text (PDF), 2008. http://eprints.ccsu.edu/archive/00000496/02/1952FT.htm.
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Thesis (M.A.) -- Central Connecticut State University, 2008.<br>Thesis advisor: Jeremiah Jarrett. "... in partial fulfillment of the requirements for the degree of Master of Arts in Biology." Includes bibliographical references (leaves 27-29). Also available via the World Wide Web.
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Naldrett, Michael James. "Cement and other adhesives in the barnacle." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306213.
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Di, Fino Alessio. "Comparative approach to barnacle adhesive-surface interactions." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2838.
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Barnacles are considered to be one of the major marine fouling organisms. Their settlement behaviour has been investigated using mainly Balanus amphitrite as a model organism. To better understand the mechanisms involved during the colonisation of surfaces by cypris larvae we have investigated another species, B. improvisus, which is reported to have different surface preferences compared to B. amphitrite. This study aims to unravel the effects of surface physicochemical cues, in particular surface free energy (SFE), surface charge and elastic modulus on the settlement of cyprids of both species. The use of well-defined surfaces under controlled conditions further facilitates comparison of the results with B. amphitrite. Furthermore, since this phase of presettlement behaviour is characterised by temporary adhesive (footprint) deposition, considered to be fundamental to surface exploration and surface discrimination by cyprids, some of the chemistries used for the settlement assays were used to investigate temporary adhesive-surface interactions. Cyprids were exposed to a series of model surfaces, namely self-assembled monolayers (SAMs) of alkanethiols with varying end-groups, homogenously applied to gold-coated polystyrene Petri dishes. The settlement response was significantly higher on negatively charged SAMs and lower on positively charged surfaces, while intermediate settlement occurred on neutral SAMs. Furthermore, no effects were observed when data were plotted against surface free energy after 48 hr of exposure. Temporary adhesive on SAMs was investigated using imaging ellipsometry and atomic force microscopy. Relatively thick footprints with low wetting were found on positively charged surfaces. Settlement of both species was also low on these surfaces. Footprints were thinner and spread more on hydrophobic surfaces. The adhesion force of temporary adhesive measured with functionalised AFM tips was higher on hydrophobic and negatively charged surfaces for both species. Furthermore, PDMS-based surfaces were prepared varying the elastic modulus, keeping constant other parameters, settlement behaviour and strength of adhesion of juveniles and adults were tested. We conclude that cyprid settlement behaviour of both species is influenced more by surface charge than SFE under controlled conditions. The temporary adhesives (footprints) of the two species had a stronger affinity for hydrophobic surfaces. Contrary ii to previous reports, therefore, the settlement preferences and adhesive secretion of these two species are similar. Elastic modulus influences settlement, juveniles and adults removal of both species, although B. improvisus is more sensitive if compared with B. amphitrite. This finding will be important for understanding the mechanism of surface selection by cyprids and for the development of future antifouling technologies.
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Fontani, Sonia. "Genetic biodiversity of the European barnacle Chthamalus montagui." Thesis, University of Plymouth, 2009. http://hdl.handle.net/10026.1/2733.
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Biodiversity ultimately is genetic diversity. Genetic diversity within species is eroded before negative trends in biodiversity become evident as loss of species or habitats. Hence, monitoring biodiversity at the genetic level may indicate what will happen at higher levels of organisation if the trend is allowed to continue. There is a pervasive belief that marine ecosystems are less vulnerable to biodiversity loss than terrestrial ones, due to marine species' high dispersal ability and connectivity, large geographic ranges, low genetic differentiation among populations and high genetic variation within populations. Many studies offer compelling evidence that it is not so: loss of genetic variation due to natural and anthropogenic factors has been detected even in marine species with potentially high dispersal. In this context the genetic pattern of the European barnacle Chthamalus montagui, a species with high dispersal capability, was investigated from three different perspectives using polymorphic microsatellite loci as molecular markers. The effect of structures created to protect coastal areas in the Adriatic Sea, was investigated to test the hypothesis that artificial substrates can act as "corridors" facilitating gene flow among previously isolated populations. The genetic pattern of central populations was compared to that of peripheral/marginal populations over the range of C. montagui in the UK, to test the hypothesis that marginal and peripheral populations tend to be less genetically variable than central ones. For both studies results were consistent with the formulated hypotheses at the 3 analysed loci. Finally, a broader survey of the NE Atlantic and Mediterranean range of this barnacle was carried out to assess spatial scales of genetic variation. A clear differentiation between Atlantic and Mediterranean samples was detected; however, the major source of genetic variation was within sites at a very small spatial scale. The information gained generates insights for marine genetic management and conservation planning.
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Goldberg, Harry. "An investigation of the feasibility of gooseneck barnacle mariculture (Lepas anatifera)." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24671.
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Gooseneck barnacles (Pollicipes cornucopia) exceeding 4 cm in length are a favourite seafood in Spain. In 1978 the British Columbia seafood industry introduced the indigenous species Pollicipes polymerus into this potentially lucrative market. Due to the problems associated with this species its export was unsuccessful.
Alternatively, to fill either the void left by Pollicipes pollymerus and/or future markets, the acquisition of seed and the subsequent suspended culture of the gooseneck barnacle, Lepas anatifera, were investigated.
Lepas anatifera successfully colonized the cultch (oyster shells, wooden dowelling and rubber) that was deployed at two locations off the west coast of Vancouver Island. The success of the colonization of cultch and the information obtained from a previous survey suggested that the set occurs regularly between the middle of April and the end of May off the west coast of Vancouver Island.
The suspended culture of Lepas anatifera indicated that growth may be site specific and that areas of a high phytoplankton/zooplankton ratio may be detrimental to growth and time to sexual maturation. At the densities studied, survival seems to be proportional to density. Capitulum growth and weight gain were significantly greater for Lepas anatifera protected from predation within lantern nets than for those grown exposed on lines of oyster shells and wooden doweling. The average total length (capitulum plus peduncle) exceeded 4cm within 17 to 23 weeks.<br>Land and Food Systems, Faculty of<br>Graduate
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Percival, Stephen Mark. "Grazing ecology of barnacle geese (Branta leucopsis) on Islay." Thesis, University of Glasgow, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338180.
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Candeias, Adriana Tojinha. "Feeding, swimming and respiration in barnacle larvae (Cirripedia: Thoracica)." Thesis, Bangor University, 2006. https://research.bangor.ac.uk/portal/en/theses/feeding-swimming-and-respiration-in-barnacle-larvae-cirripedia-thoracica(fa95c21c-28dd-4d89-a617-8d1a12e41045).html.
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For planktotrophic larvae, the availability of food is one of the major factors thatcontrol growth and development. In the present study, feeding and starvation were investigated within the scope of survival, swimming and respiration rates of Cirripedialarvae. Adults of Pollicipes pollicipes (Pedunculata: Scalpellidae) and Elminius modestus(Sessilia: Balanidae) were collected from the Iberian Peninsula and western UK coast, respectively, and a series of laboratory experiments conducted using a novel rotating wheel immersed in a temperature controlled tank. Observations were made on larval growth, gut size, mobility and oxygen consumption in response to both the supply of food in the form of controlled algal sources, as well as starvation conditions. Resulting data were analysed and revealed notable trends in the relationship between the different functional outputs at different stages of development, up to and including the cyprid. Mono- and mixed algal cultures were tested, confirming that both barnacle species have geographical related dietary preferences. Size of algal cells was only one of the factors associated with feeding rates, while volume densities and quality of the supplied phytoplankton proved of substantial importance throughout the whole study. Under starvation conditions, swimming performance did not deteriorate during 28 hours after hatching, indicating that E. modestus nauplius II carry enough yolk reserves to proceed the search for food. Nonetheless, oxygen consumption reduced after 8 hours indicating that larvae are able to adjust their metabolism as an energy conservation strategy. This would account for the oceanic distribution of spawned larvae even under conditions of impoverished plankton supply. Increase in oxygen consumption in earlier larval stages is associated with high energy expenditure of swimming and capture of food, while during the metanauplii, stable weight specific respiration rate accompanied by reduced swimming speeds suggests an increase in non-swimming related metabolic activity, possibly reflecting a radical physiological and functional shift at this stage. The first demonstration of specific dynamic action in barnacle larvae is discussed. The details provided on specific feeding rates and development, algal preference, physiological processes and swimming behaviour of barnacle larvae, contribute to the understanding of the effect of barnacles on the phytoplankton while part of the meroplankton communities.
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Johnston, Laurel A. "Temperature Affects Adhesion of the Acorn Barnacle (Balanus amphitrite)." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/243.
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Biofouling is the accumulation of sessile marine organisms, such as algae, tube worms and barnacles on man-made substrata and has negative economic and ecological implications. Ship hulls are readily fouled, which significantly increases drag while decreasing ship fuel efficiency when moving through water. Fouled hulls have also become important vectors of invasive species. These problems are minimized when hulls are painted with a toxic anti-fouling or non-toxic foul-release coating. Due to recent restrictions of anti-fouling paint use, research and development of non-toxic alternatives has increased.
Novel hull coating efficiency is often quantified by the critical removal stress value of barnacles from the coating. Barnacle adhesive cement protein content is thought to be responsible for barnacles’ incredible ability to adhere underwater. The expression level and type of adhesive proteins has eluded scientists due to their extreme insolubility within cured barnacle cement. Identification of these proteins may provide insight to the adhesion of fouling species and aid coating development.
Barnacles are a cosmopolitan organism, able to withstand a wide range of environmental conditions, yet foul-release coating research had not previously incorporated environmental factors as variables in determining coating performance. Temperature is known to affect protein structure and function and is also a formative factor of barnacle larvae survival and development. Even so, the interaction between temperature and barnacle adhesion to has not previously been explored. We examined the effect of temperature on barnacle adhesion to foul-release coatings. After observing differences in critical removal stress due to temperature, we attempted to attribute these differences to specific proteins within the adhesive using 2D SDS PAGE. Gel image analysis determined that there were significant differences in cement protein expression between barnacles raised within different temperatures. Preliminary protein identification with Mass Spectronomy (MALDI TOF/TOF) was performed, however further research and a larger barnacle genomic database is needed to elucidate barnacle cement protein sequences.
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Goodrick, Richard David. "The importance of the voluntary component in the measurement of cypris tenacity." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282222.
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Whillis, J. A. "Settlement behaviour of barnacles in relation to the patterns of marine fouling development." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377691.
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Stone, Carolyn J. "The effects of variations in diet, temperature and salinity on the development of Cirripede nauplii." Thesis, Swansea University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235943.
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Wong, King-wai Kelvin, and 黃景瑋. "Proteome response of barnacle larvae to CO2-driven seawater acidification." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46475084.
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Neal, A. L. "The influence of bacterial films upon barnacle cypris temporary adhesion." Thesis, Bangor University, 1994. https://research.bangor.ac.uk/portal/en/theses/the-influence-of-bacterial-films-upon-barnacle-cypris-temporary-adhesion(5dd9028f-ab39-473e-8d4d-b3206bf4abd9).html.
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The thesis describes experiments investigating interactions between barnacle cypris larvae and bacterial films covering substrata. The work begins with a confirmation of the link between temporary adhesion of cypris larvae and subsequent settlement. The following chapters then investigate, in detail, barnacle/biofilm interactions by measuring cypris temporary adhesion to films. Initially, bacterial strains were isolated from solid surfaces in the intertidal areas of the Menai Strait in an attempt to correlate bacterial zonation on the shore with barnacle zonation. However, the results of bacterial collection were inconclusive and a more in-depth study would have proved too onerous to be completed in this body of work. Instead the bacterial strains isolated were used to study the effect of monospecific films and their products on the larvae of Verruca strdemia larvae. The results show that individual biofilms differ in their likelihood to encourage settlement and that exopolysaccharides from one of the isolates (Pseudomonas W1+) have a concentration dependent inhibitory effect upon temporary adhesion. The next chapter deals with the effects of shear upon biofilms and the subsequent effect upon the temporary adhesion of Elminius modestus and Balanus perforates cyprids. The work demonstrates that the two species may appreciate differences in bacterial communities grown under contrasting shear regimes. Finally, the effect of individual polysaccharide components of bacterial films upon temporary adhesion of five barnacle species is studied showing that monosaccharides have an inhibitory effect upon temporary adhesion, but that pentoses have the least effect, whilst hexoses have a more marked effect. The greatest inhibition is caused by uronic acids, probably because of their more polar nature. The overall conclusions suggest that the physico-chemical nature of bacterial films has a more profound effect upon cypris adhesion and settlement than species composition and that bacterial films do have a role to play in settlement and possibly in zonation of barnacles.
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Song, W.-C. "Eicosanoid hatching factors in barnacles." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234779.
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Burrows, Michael Timothy. "The comparative biology of Chthamalus stellatus (Poli) and Chthamalus montagui southward." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236223.
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Lamont, Eleanor. "Swimming Kinematics and Thoracic Appendage Morphology in Cyprids of Balanus glandula." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23182.
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As the final larval stage before settlement, barnacle cyprids swim with six pairs of thoracic appendages used to maintain orientation, change direction, and swim against downwelling currents. This thesis examines thoracic appendage morphology and swimming behavior in cyprids of Balanus glandula Darwin, 1854. Cyprid swimming appendages carry arrays of plumose setae, unique among crustaceans in that setules of adjacent setae are permanently fused at their tips, creating a webbed setal array. Cyprids are drag-based swimmers, beating appendages sequentially through metachronal strokes during which interconnected arrays act as paddles. Setal arrays spread apart during metachronal power strokes (increasing surface area and drag force of the appendage) and collapse together during synchronous recovery strokes (decreasing surface area and limiting drag). Cyprids move at an average speed of 1.4 cm/sec (with peak speeds of 6 cm/sec) during a beat cycle, with a frequency of 16 beats/sec. This thesis includes previously unpublished co-authored material.<br>2019-01-09
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Geierman, Christina. "Barnacle feeding : comparing cirral anatomy, feeding behavior, Reynolds numbers, and cirral fan leakiness across three size classes of three species of common acorn barnacles /." Connect to title online (Scholars' Bank), 2007. http://hdl.handle.net/1794/6003.
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Geierman, Christina 1982. "Barnacle Feeding: Comparing Cirral Anatomy, Feeding Behavior, Reynolds Numbers, and Cirral Fan Leakiness Across Three Size Classes of Three Species of Common Acorn Barnacles." Thesis, University of Oregon, 2007. http://hdl.handle.net/1794/6003.
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xv, 97 p. : ill. A print copy of this title is available through the UO Libraries under the call numbers: SCIENCE QL444.C58 G45 2007<br>This thesis investigated feeding behavior, cirral anatomy, Reynolds numbers (Re's), and leakiness of the cirral fan for three barnacle species: Balanus glandula, Semibalanus cariosus, and Balanus nubilus. A study of the feeding of B. glandula revealed that newly-metamorphosed juveniles fed at Re's less than one and their cirral fan leakiness was <5% at current speeds of 4 cm/s. At this speed, large and medium individuals fed at Re's near unity, and their cirral fans were 6.8±O.7% leaky. The experiments were repeated using S. cariosus and B. nubilus with the same tissue mass as B. glandula. No clear species-specific or size-specific trends were identified in these species. The observed switch from low to high Re feeding in B. glandula may indicate a lower limit to the size of this species, if further research confirms low Re feeding is less efficient and field current velocities are sufficiently low.<br>Adviser: Richard Emlet
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Bacchetti, de Gregoris Tristano. "Studies on the acorn barnacle Balanus amphitrite and its associated bacteria." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1238.
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Despite being a model organism to study settlement in marine invertebrates, little is known about the genetics of the barnacle Balanus amphitrite. To fill this gap, cDNA libraries representative of different developmental stages were generated and sequenced. Nearly 14,000 genes were annotated, which may represent 2/3 of the species’ total protein coding regions. The database that was created to allow public access to this genetic information will profoundly benefit future research aiming to understand the molecular regulation of development and settlement in this species. Furthermore, a quantitative real-time PCR assay to study gene expression in B. amphitrite was designed and validated. Eleven genes were studied for their ability to normalize qRT-PCR data. Total RNA extracted from seven developmental stages was reverse transcribed and the expression stability of the selected genes was compared. It was found that transcripts encoding cytochrome b and NADH dehydrogenase subunit 1 were expressed most stably, and their use to normalize gene expression data is recommended. Conflicting evidence exists on the role of bacteria in B. amphitrite settlement. However, there is a paucity of information on the microbial community naturally associated with this barnacle. In order to reveal the existence of stable associations, a 16S rRNA-based, taxon-specific qPCR assay was developed to monitor the preponderance of 5 bacterial phyla and classes. Furthermore, attempts to profile these qPCR products by DGGE were made. This new method was applied to characterise the bacterial communities associated with different B. amphitrite developmental stages and body parts. It was found that the structure of these communities changed throughout the barnacle life cycle in a highly reproducible manner. Furthermore, bacteria isolated from the barnacle shell were capable of inducing settlement of conspecific larvae. The analysis of these communities at a lower taxonomic level should confirm if any of these ecologically important bacteria are vertically transmitted.
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Kirby, Margaret Rose. "Barnacle settlement behaviour in response to con- and allo-specific cues." Thesis, University of Newcastle Upon Tyne, 2006. http://hdl.handle.net/10443/860.
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The project aimed to investigate the utility of selected temperate barnacles as a model species for recently-developed laboratory assays, and to progress the understanding of barnacle con- and allo-specific settlement behaviour through laboratory and field experiments, and the partial characterisation of the adult cue. Elminius modestus larval settlement assays using a 24-well plate assay indicated a preferred settlement temperature of 22±1°C, and gregarious settlement was demonstrated significantly at a Settlement Factor (SF) concentration of 10 μg ml"1. Experiments on the effects of ageing revealed a pattern to settlement not previously observed in the larval community, with high settlement when cyprids were young, reduced when mid-aged, and then increasing with increasing age with an accompanying loss of discrimination to settlement cues. It was questioned whether this may be due to the species physiology, or the presence of different phenotypes. Similar experiments with Semibalanus balanoides wild cyprids were far from conclusive, though the preferred settlement temperature was 19±1°C. Further laboratory experiments using S. balanoides cyprids were not pursued The active adult protein, known as settlement-inducing protein complex (SIPC), was isolated from E. modestus. One subunit was selected for amino acid sequencing, and subsequent gene isolation by molecular methods. Two short amino acid sequences were isolated from the protein; 1) ATPSLPDNI and 2) QYTYEYEAK. Laboratory experiments investigating settlement behaviour of Emodestus and Balanus amphitrite larvae to SF, from six species including the conspecific, showed that settlement by each species was significantly different to different concentrations of each SF tested. However, comparisons between different SFs of the same concentration were not significantly different. Results of choice assays, using several species' SFs in a single experiment, again indicated that there was no significant difference in settlement between different species. In field experiments S. balanoides settlement preferences were defined as: - S. balanoides > E. modestus > (B. improvisus = B. crenatus = C. montagui) (where '>' indicates a significant preference and `=' indicates no significant difference), while settlement by E. modestus cyprids was the same to all SFs.
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Piyapattanakorn, Sanit. "Molecular ecology and evolution of an acorn barnacle, Balanus improvisus (Darwin)." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368157.
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Hur, Sunyoung. "Molecular mechanism of barnacle adhesion : a structural approach and underlying biochemistry." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS572.pdf.
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Les balanes adhèrent de manière robuste et permanente à divers substrats sous-marins grâce à de fortes interactions d’une couche complexe multiprotéique appelée « ciment ». Cependant, les interactions intermoléculaires responsables des fortes propriétés adhésives du ciment de bernacle restent mal comprises. Une hypothèse centrale de cette thèse est que les propriétés sous-marines du complexe cimentier sont intimement liées aux caractéristiques moléculaires des protéines de ciment (CP) formant le complexe de ciment. Des études antérieures ont montré que le ciment est fait de nanofibrilles de type amyloïde qui peuvent contribuer à l’adhérence. Cependant, la protéine responsable de la formation de ces nanofibrilles reste inconnue. Dans cette étude, les caractéristiques morphologiques à l’échelle nanométrique des protéines de ciment recombinantes (CP) de la balane Megabalanus rosa (MrCP19 et MrCP20, avec les chiffres indiquant un poids moléculaire de 19 kDa et 20 kDa respectivement) ont été caractérisées par la mesure du dichroïsme circulaire (CD), le test Thioflavin T (ThT), la microscopie à force atomique (AFM) et la microscopie électronique à transmission (TEM), suggérant le potentiel de former des structures nano-fibrillaires dans certaines conditions. Sur la base de la structure primaire et de la morphologie de surface des protéines, des études mécaniques, biochimiques et antimicrobiennes ont été menées pour comprendre les rôles uniques de ces protéines interfaciales sur la croissance des balanes et le processus d’attachement à la surface, par exemple la biominéralisation et le contrôle de la biodégradation. Les mesures effectuées à l’aide de l’appareil de force de surface (SFA) et de la microbalance à cristaux de quartz avec surveillance de la dissipation (QCM-D) ont montré que les interactions électrostatiques jouent un rôle clé dans l’adsorption et l’adhésion de surface de MrCP19 et MrCP20. En outre, l’influence mutuelle de la croissance de la plaque de base de bernacle (minéralisation de carbonate de calcium) et de la fibrillation de la protéine de ciment MrCP20 adjacente a été étudiée à l’aide de surfaces d’or fonctionnalisées monocouches (SAM) auto-assemblées, de spectroscopie Raman, de QCM-D, de spectromètre photoélectronique à rayons X (XPS) et de spectroscopie infrarouge à transformée de Fourier à réflectance totale atténuée (ATR-FTIR). Parallèlement, l’influence du substrat externe adjacent à la protéine de ciment MrCP19 sur les cellules bactériennes présentes dans le biofilm sur les surfaces sous-marines en milieu marin a été démontrée à l’aide de différents tests microbiologiques, notamment le test de zone d’inhibition, le test de concentration minimale inhibitrice (CMI), la MET, l’étude de fluorescence, etc. Plus intéressant encore, une hypothèse intrigante concernant le processus de fibrillation amyloïde et l’activité antimicrobienne a été suggérée. Sur la base de ces examens préliminaires, les deux PC interfaciaux ont montré des responsabilités potentielles distinctes sur le tassement des bernacles, non seulement avec son adhérence, mais aussi avec d’autres rôles fonctionnels aux interfaces. Ces travaux amélioreront nos connaissances sur les contributions individuelles de MrCP19 et MrCP20 dans le complexe cimentier et donc dans la capacité globale d’adhésion sous-marine des balanes. À cet égard, la thèse vise à fournir des lignes directrices moléculaires pour le développement de mimiques polymères inspirés des PC (à base de peptides ou de protéines) à partir de ce système moléculaire bio-adhésif<br>Barnacles adhere themselves robustly and permanently to diverse underwater substrates through strong interactions of a multi-protein complex layer called the “cement”. However, the intermolecular interactions responsible for the strong adhesive properties of the barnacle cement remains poorly understood. A central hypothesis of this thesis is that underwater properties of the cement complex are intimately linked to the molecular characteristics of cement proteins (CPs) forming the cement complex. Previous studies have shown that the cement is made of amyloid-like nanofibrils that may contribute to adhesion. However, the protein responsible for the formation of these nanofibrils remain unknown. In this study, the nanoscale morphological features of recombinant cement proteins (CPs) from the barnacle Megabalanus rosa (MrCP19 and MrCP20, with the numbers indicating molecular weight of 19 kDa and 20 kDa respectively) were characterized by Circular Dichroism (CD) measurement, Thioflavin T (ThT) assay, Atomic Force Microscopy (AFM), and Transmission Electron Microscopy (TEM), suggesting the potential to form nano-fibrillar structures under certain conditions. Based on the proteins’ primary structure and surface morphology, mechanical, biochemical, and antimicrobial studies were conducted to understand the unique roles of these interfacial proteins on barnacle growth and surface attachment process, for instance biomineralization and biodegradation control. Measurements using Surface Force Apparatus (SFA) and Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) illustrated that electrostatic interactions play a key role in surface adsorption and adhesion of MrCP19 and MrCP20. In addition, the mutual influence of barnacle base plate growth (calcium carbonate mineralization) and the adjacent cement protein MrCP20 fibrillation was investigated using self-assembled monolayer (SAM) functionalized gold surfaces, Raman spectroscopy, QCM-D, X-ray photoelectron spectrometer (XPS), and Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Concurrently, the influence of the external substrate adjacent cement protein MrCP19 on bacteria cells which are present in biofilm on underwater surfaces in marine environment was demonstrated using different microbiology tests including zone of inhibition test, Minimum inhibitory concentration (MIC) assay, TEM, fluorescence study, and so on. More interestingly, an intriguing hypothesis regarding amyloid fibrillation process and antimicrobial activity was suggested. Based on these preliminary examinations, the two interfacial CPs showed distinctive potential responsibilities on barnacle settlement not only with its adhesion but also with other functional roles at the interfaces. This work will improve our knowledge about individual contributions of MrCP19 and MrCP20 in cement complex and hence in overall underwater adhesion capacity of barnacles. In this regard, the thesis aims at providing molecular guidelines towards the development of CPs inspired polymeric (peptide or protein based) mimics from this bio-adhesive molecular system
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Berger, Michael Stuart. "Living along an estuarine gradient : juvenile performance, reproductive patterns, and heat-shock protein expession [sic] in the barnacle Balanus glandula /." view abstract or download file of text, 2004. http://wwwlib.umi.com/cr/uoregon/fullcit?p3136403.
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Thesis (Ph. D.)--University of Oregon, 2004.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 125-142). Also available for download via the World Wide Web; free to University of Oregon users.
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Kent, Adam. "Influence of recruitment on population persistence in open and closed systems." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340661.
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Allhouse, Leanne Dawn. "Characterisation of troponin C, the calcium binding protein of barnacle striated muscle." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312246.
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Maskrey, B. H. "Studies of eicosanoid biosynthesis and their involvement in barnacle reproduction and development." Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638022.
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The predominant eicosanoids generated by <i>Balanus perforatus</i> were examined on a monthly basis by reverse phase high pressure liquid chromatography and were identified as 8-hydroxyeicosapentaenoic acid, and 8-hydroxyeicosatetraenoic acid, with their generation correlating with the environmental seawater temperature. No change in either apparent lipoxygenase activity or precursor fatty acid levels were found with the time of year. Changes in fatty acid composition followed the trend expected by homeoviscous adaptation. The subtidal barnacle <i>B. balanus</i> was found to generate an unusual range of products which were tissue-specific in generation, with the testes/seminal vesicles producing large amounts of a novel eicosanoid identified by mass spectrometry as 8,13-dihydroxyeicosapentaenoic acid (diHEPE). This product was highly acid-labile, degrading to a range of unidentified conjugated triene- and pentaene-containing products. Addition of 8,13-diHEPE to excised barnacles increased muscular contractions which is believed to aid in fertilisation. Preliminary results suggest biosynthesis through joint lipoxygenase and cytochrome P450 pathways. The involvement of various eicosanoids, particularly trioxilins and hepoxilins in triggering egg-hatching of <i>Elminius modestus</i> larvae was examined. In contrast to previous reports, trioxilin A<sub>3</sub> was not found to cause egg-hatching, whereas its unstable epoxide precursor, hepoxilin A<sub>3</sub>, and the synthetic hepoxilin analogue, PBT-3, did at concentrations of 10<sup>-6 </sup>and 10<sup>-7</sup> M respectively. Crude barnacle extracts are known to cause an increase in the settlement of <i>B. amphitrite</i>, although in this study crude adult extracts separated by chromatography had no significant effect on levels of settlement, although the precursor fatty acid arachidonic acid caused an increase in settlement. A range of plant-derived terpenoids were found to inhibit settlement of <i>B. amphitrite.</i>
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Yan, Yan, and 嚴岩. "The ecology of the high shore barnacle: chthamalus malayensis in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31245006.
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Black, J. M. "The pair-bond, agonistic behaviour and parent-offspring relationships in barnacle geese." Thesis, Cardiff University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378102.
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Martin, Rebecca. "The adhesion of the barnacle Elminius modestus (Darwin) to fouling-release coatings." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3855.
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The main aim of this thesis was to investigate the potential of Elminius modestus (= Austrominius modestus) for evaluating the performance of fouling-release (FR) coatings. A secondary aim was to explore how the membranous-basis of this species influences the fracture mechanics and release from FR coatings in comparison to Balanus amphitrite (= Amphibalanus amphitrite), a barnacle with a calcareous-basis and widely adopted as a model for antifouling and FR studies. The critical removal stress (CRS) − the force required to remove fouling organisms, normalised by contact area − is a standard measure to evaluate FR coatings using either barnacles with calcareous-bases or metal studs (‘pseudobarnacles’). Testing FR coatings against a diverse range of fouling organisms is necessary to evaluate the global effectiveness of a coating. The percentage settlement of cyprids, growth rate, and CRS of laboratory-cultured barnacles were evaluated on polydimethylsiloxane (PDMS) standard coatings (Silastic T-2 and Sylgard 184). The percentage settlement on the PDMS coatings between the two species did not significantly differ, however, there were differences in the growth rate and CRS. When grown on Silastic T-2 and Sylgard 184 and fed Tetraselmis suecica algae, E. modestus grew at a faster rate than that of B. amphitrite. There was also a significant coating effect on the growth of E. modestus with barnacles on Sylgard 184 growing to larger size than those grown on Silastic T-2. The CRS of E. modestus was less than that for B. amphitrite but only for the coating Sylgard 184. Using high-speed photography, the separation processes of E. modestus and B amphitrite, from Silastic T-2 and Sylgard 184 coatings was observed. Four distinct separation patterns were characterised; lift, peel, adjacent peel and twist. These were based on the location of the initial separation and direction of propagating instabilities in respect to the direction of detachment force. The observed differences in the separation patterns between species may have more to do with the variations in shape and structure of the barnacle shell than to the type of basis. However, the flexibility of the membranous-basis of E. modestus was important for the propagation of the fracture as it hindered the formation of fingering instabilities as they progressed through the adhesive interface. The bulk properties of five polysiloxanes and three fluoropolymers were modified by changing the polymer chain length and cross-linker density, which provided coatings with a modulus ranging from 0.31 to 19.73 MPa. These were used to investigate whether laboratory assays were a good predictor of a coatings performance in the field, in terms of settlement/recruitment and CRS. Two field populations (Fairlie Quay and Burnham-on-Crouch) over two years (2010 and 2011) were compared to a laboratory culture of E. modestus barnacles. There were similarities between the laboratory settlement/field recruitment and CRS of E. modestus from the two field populations and the laboratory culture across the eight coatings. This made it possible to discriminate between the coatings. Although, the CRS measurements did significantly differ between locations and years, where the general pattern from highest to lowest in terms of CRS between the locations was Fairlie Quay > laboratory > Burnham-on-Crouch. These eight coatings were also used to investigate the degree in which the elastic modulus of a coating can influence the CRS of E. modestus, compared to the CRS of B. amphitrite. The regression analysis confirmed that as the modulus increases the CRS for both species increases. There were marked differences in the removal of barnacles from the high modulus fluoropolymers. B. amphitrite, unlike E. modestus, failed to detach and left the basis on the coating’s surface. As E. modestus can differentiate between the coatings in terms of FR efficacy and was amenable to laboratory culture with a comparable growth rate to B. amphitrite, this species is recommended as an additional model for FR studies.
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Royo-Gelabert, Eva. "Effects of copper on the acorn barnacle Elminius modestus (Darwin) (Cirripedia: Thoracica)." Thesis, Bangor University, 1995. https://research.bangor.ac.uk/portal/en/theses/effects-of-copper-on-the-acorn-barnacle-elminius-modestus-darwin-cirripediathoracica(b7a0be3b-390e-482e-8450-0865a2ca1687).html.
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The acorn barnacle Elminius modestus (Darwin) was shown to be an excellent organism in which to study the effects of pollution throughout the life cycle. Effects of copper were demonstrated on both larval and adult forms at acute, chronic and physiological levels. Acute effects of copper on E. modestus nauplii were shown through acute toxicity tests (100 ppb-500 ppb). The test procedure was standardised and subsequently used to identify the effects of various factors on copper toxicity. Rises in temperature from 12.5*C to 22.5*C increased copper toxicity to the nauplii. Parental maintenance could affect naupliar tolerance to copper. The organic content of seawater reduced copper toxicity to the nauplii. The tolerance of nauplii from the copper-contaminated Dulas Bay had a genetic origin. The complex interactions between food, feeding behaviour and copper toxicity were investigated throughout the development of E. modestus larvae. The major findings pinpointed 'nutritional stress' as the main factor that influenced the action of dissolved copper. In the laboratory, chronic effects on adult E. modestus barnacles were evidenced through reduced survivorship, growth and reproductive effort in a population exposed to 50 ppb copper for more than four months. Exposure of E. modestus adults to 20 ppb copper reduced feeding rates and altered feeding behaviour. Further physiological effects of copper were demonstrated on E. modestus nauplii through variations in oxygen consumption. At 16*C, nauplii exposed to 50 ppb had higher respiration rates than 'control' nauplii. The oxygen consumption of nauplii at higher concentrations was equivalent to that of uncontaminated nauplii. The result is interpreted as evidence that regulation (copper sequestration) incurs an energetic cost.
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Jeffrey, Carolyn Jean. "Ecology of the rocky shore intertidal barnacle Chamaesipho tasmanica in New South Wales." Thesis, University of Sydney, 1997. http://hdl.handle.net/2123/3765.
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Osborn, Jesse. "The Affect of Low Tide on the Digestion of Balanus glandula, the Acorn Barnacle." Scholarship @ Claremont, 2013. http://scholarship.claremont.edu/scripps_theses/141.
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The rocky intertidal zone, experiencing fully marine and fully terrestrial conditions, has become increasingly investigated as a model ecosystem for studying the future implications of climate change. The barnacle, Balanus glandula, a common rocky intertidal inhabitant, plays an important role as a key prey item for many organisms. Low tide can be particularly challenging for barnacles as they are marine organisms subjected to the abiotic conditions of a terrestrial environment. The most stressful of these are increased temperature and decreased oxygen availability. This study aimed to investigate how low tide impacts the energy budget, specifically the digestion, of B. glandula. Barnacles are unable to feed at low tide however, if they were able to digest at low tide, they could maximize their energy intake by emptying their stomach to prepare to feed at the next high tide. However, digestion is a metabolically costly activity, which could make it less energetically favorable to digest when there’s less oxygen available. To test for an effect of low tide on digestion, barnacles were fed, and the time to first fecal production measured as a ‘baseline’. This was repeated, but barnacles were exposed to either a 16ºC or 35 ºC low tide immediately after being fed. The change in digestion time was calculated by comparing these two times for each barnacle. It was found that regardless of temperature, barnacles delayed their digestion by about 50-60 minutes after exposure to a one hour low tide. To determine the energetic cost of digestion, the rate of oxygen consumption was compared between starved and digesting barnacles. I was unable to detect any evidence of elevated metabolic activity during digestion. Additional testing is needed to confirm these results as the barnacles may have not fed during the trial, thus had no food to digest. While it appears that increasing temperatures associated with climate change will have little impact on the digestion of barnacles at low tide, if climate change alters the duration of low tide, there could be an energetic impact to barnacles due to the slowing of their metabolism as indicated by the delay in their digestion.
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Pearson, Ryan. "Shell walls: A new hope. Using barnacle shell isotopes as a conservation tool for understanding the movement ecology of threatened sea turtles." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/380998.
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Understanding the geographic distribution of sea turtles within their sub-populations could enhance conservation and management, especially for sub-populations that are the most threatened. Isotope techniques have been used for this purpose and have become popular in the past decade, with an increasing year-to-year trend in published studies. Via systematic literature review of all studies using isotopes to understand sea turtle ecology, this thesis first presents a robust understanding of the current state of the science, identifying knowledge gaps and priorities for future sea turtle conservation research (Chapter 2). This identified that very few stable isotope studies aimed at understanding foraging distributions have been completed on threatened sub-populations of sea turtles, whereas those considered of least concern by the IUCN have been the focus of many. I aimed to address this mismatch between stable isotope studies and conservation needs by developing, validating, and applying a novel isotope technique to understand the foraging distribution of critically endangered South Pacific loggerhead turtles (Caretta caretta), and in doing so identifying critical habitats for priority management. The technique presented uses isotope ratios from commensal barnacle shells, which vary with temperature (SST) and salinity (SSS) rather than turtle diet. Barnacle shells are formed sequentially, storing chemical information about of the surrounding conditions at the time of formation. This makes it possible to assign a date to samples, and compare isotope ratios with the spatial and temporal distribution of sea water parameters (SST and SSS), if the growth of the animal is well understood. Thus, in this thesis I tested the applicability of using barnacles to understand sea turtle foraging distribution by quantifying barnacle growth rates (Chapter 3), regional relationships between barnacle isotopes (C and O) and SST & SSS (Chapter 5), and discriminating between foraging areas based on time dependent isoscapes for barnacle shell (Chapter 4, 5). Finally, the technique is applied to predict the home area of loggerhead turtles that nest in southern Queensland, Australia, identifying hotspots and relationships between nesting and foraging habitats (Chapter 6). This thesis demonstrates that isotopes from barnacle shells can be used to identify the origin and migration distances of host turtles at varying spatial scales, depending on water chemistry gradients present at the time and location of shell formation. In eastern Australia is it possible to assign turtles to home areas with >86% accuracy when areas are separated by at least 400 km (Chapter 4). Globally, many coastal areas are likely to offer similar or better resolution to this, while pelagic waters will typically offer lower resolution. This thesis also shows that estuarine habitats are important foraging habitats for adult loggerhead turtles, probably more so for southern foragers, while marine habitats are clearly important in northern Australia. Future research should focus on developing isoscapes for barnacle shell in other regions, and combining barnacle analyses with other methods to improve the achievable resolution. I also expect that this technique can be applied widely to other taxa and objects that carry commensal barnacles throughout marine journeys.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Environment and Sc<br>Science, Environment, Engineering and Technology<br>Full Text
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Kunzel, Theresa. "The influence of eutrophic conditions on the activity of the suspension-feeding barnacle Semibalanus balanoides." Thesis, Halmstad University, School of Business and Engineering (SET), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1255.
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<p>Eutrophication is a current problem on coastal lines worldwide. Cirripedia like the northern acorn barnacle Semibalanus balanoides actively help to prevent high amounts of plankton in the coastal zones by filtering plankton out of the surrounding water. This investigation focuses on the movements of Semibalanus balanoides in comparison to increasing concentrations of plankton in the water (between 33mg and 110 mg particles per litre) which simulate eutrophication. The four factors feeding activity, pumping activity, isolation time and clogging of the feeding apparatus in relation to the plankton concentration of the water were examined. </p><p>The results show significant interaction between pumping movement and the plankton concentration. The feeding activity, the isolation time and the clogging compared to the plankton concentration get no statistical results. </p><p>Less feeding activity and an increase in pumping behaviour will not decrease the amount of plankton in the coastal waters which will increase the problems of eutrophication. The paper shows that more investigation on suspension feeders and their surroundings needs to be done to be able to understand the dangers fully.</p>
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Maleschlijski, Stojan [Verfasser], and Axel [Akademischer Betreuer] Rosenhahn. "Behavior of barnacle larvae during surface exploration studied by stereoscopy / Stojan Maleschlijski ; Betreuer: Axel Rosenhahn." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180033272/34.
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Aldred, Nick. "The adhesion and adhesives of barnacle cyprids (Balanus amphitrite; Semibalanus balanoides) and mussels (Mytilus edulis)." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437942.
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Blythe, Jonathan N. "Recruitment of the intertidal barnacle Semibalanus balanoides : metamorphosis and survival from daily to seasonable timescales." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45609.
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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references.<br>The benthic habitat is the terminal destination for marine animals in terms of their reproductive lifecycle. Recruitment dynamics relating to seasonal changes in the benthic habitat may be the best source of information for predicting recruit abundance and for marine resources management. The transition from the pelagic to the benthic phases is the last stage in the connectivity between benthic populations. The transition to the benthos may be a process that dominates recruitment dynamics to the exclusion of other characteristics of larvae such as their quality and their density. Recruitment of benthic marine animals is influenced by two seasonally varying factors of the benthic habitat. First, the availability of suitable habitat for recruitment can in large part determine the survival probability for settlers, a trend that is most pronounced for low or no survival when the settlement substrate is saturated by conspecifics from a recruitment cohort. Preemption is caused by the presence of current occupants from a recruit cohort, and it influences the settlement rate or the survival probability of conspecifics. Descriptive statistics (Chapter 2) and a field experiment (Chapter 4) highlight the role of preemption on barnacle recruitment. The second factor results from seasonal changes in environmental conditions that settlers experience in the benthic habitat, which could affect the physiology and survival probability of barnacle settlers. Highly unpredictable features of recruitment dynamics also play a role, such as wind that enhances wave action in the rocky intertidal that has been linked to the rate of settlement. Day to day variability in wind may cause patterns of settlement to be highly unpredictable. Predator induced mortality is spatially aggregated, and the random pattern of mortality in space is highly unpredictable. In contrast to these high frequency sources of recruitment variability, seasonal factors that vary at lower frequencies and that often change monotonically lend great predictive ability for recruitment dynamics. It appears that barnacles have evolved to compete for suitable habitat and have mechanisms to cope with seasonally varying environmental conditions in the benthic habitat, which may be the basis for why these features dominate the barnacle recruitment dynamic.<br>by Jonathan N. Blythe.<br>Ph.D.
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Conlan, Sheelagh Louise. "Effects of environmental and surface factors on settlement and adhesion of the barnacle Balanus amphrite." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2486.
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Biofouling is a substantial problem for the maritime industry. Organisms growing on underwater surfaces increase drag on ships’ hulls and damage coastal machinery. Billions of dollars are spent annually on mitigating fouling. The tropical barnacle (Balanus amphitrite) is a major fouling species. This thesis investigates the effects of some of the major environmental controls for this benthic species, (surface chemistry, temperature and food availability), on the adhesion and adhesives of two of its life cycle stages, the settlement-stage cypris larva (the final larval stage of barnacles) and the adult.
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Larsson, Ann. "Flow effects on settlement and recruitment in the barnacle : balanus improvisus with applications for biogouling control /." Göteborg : Dept. of Marine Ecology, Göteborg University, 2006. http://www.loc.gov/catdir/toc/fy0706/2006411323.html.
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Nylund, Göran M. "Epibiosis of red algae and algal metabolites as settlement inhibitors of the barnacle Balanus improvisus Darwin." Göteborg [Sweden] : Dept. of Marine Botany, Göteborg University, 1999. http://bibpurl.oclc.org/web/20311.
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Thesis (master's)--Göteborg University, 1999.<br>Title from PDF t.p. (viewed on Sept. 25, 2007). At head of title: Tjärno Marine Biological Laboratory. Includes bibliographical references (p. 13-14).
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Eichhorn, Götz. "Travels in a changing world flexibility and constraints in migration and breeding of the barnacle goose /." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/.
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Larsson, Ann. "Flow effects on settlement and recruitment in the barnacle Balanus improvisus with application for biofouling control /." Göteborg : Göteborg University, Department of Marine Ecology, 2006. http://www.loc.gov/catdir/toc/fy0706/2006411323.html.
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Cardoso, Ana Cristina de Jesus. "The population biology of the gooseneck barnacle Pollicipes pollicipes (Gmelin, 1790) in the Algarve, southwest Portugal." Thesis, Bangor University, 1998. https://research.bangor.ac.uk/portal/en/theses/the-population-biology-of-the-gooseneck-barnacle-pollicipes-pollicipes-gmelin-1790-in-the-algarve-southwest-portugal(cdec5855-34ad-49d1-8705-9aee92c8c722).html.
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The pedunculated cirripede Pollicipes pollicipes (Gmelin) is of considerable economic importance in Portugal, particularly along the southwest coast. The current knowledge of its biology is poor, as evidenced by the paucity of available literature. Over a period of two years, P. pollicipes populations at Castelejo and Zavial were sampled from different tidal levels at approximately monthly intervals. Populations at two other sites, Ponta- da- Fisga and Sagres, were also sampled but at irregular intervals. The current study has provided definitive information on the annual reproductive cycle of P. pollicipes that is essential for any attempt at fisheries management. It is shown conclusively that shell-banding techniques are easily applicable to age and growth studies on these lepadomorph barnacles and has provided initial information on the growth rates and factors influencing shell deposition in experimental situations. An exhaustive data set provides a complete set of morphometric tools for the conversion of length measurements into dry and ash-free weights and demonstrates little differences between shapes of P. pollicipes on the different shores sampled. The demonstration that P. pollicipes is an obligate cross-fertilising barnacle has subtle implications in managing the fishery since it is imperative that any adopted policy incorporates aggregates of the barnacle as a unit necessary to ensure continuing recruitment. P. pollicipes when grown under simulated semi-diurnal conditions of emersion and immersion lay down clearly defined bands with almost an exact coincidence with the number of emersions. However, barnacles from the field showed no clear banding periodicity since band widths were very similar throughout the shell length with no regular "check" marks that could provide age estimation. Differences in the reproductive patterns between Castelejo and Zavial were minor and none statistically significant hence differences in environmental conditions between the two sites do not appeared to materially affect the species reproductive patterns. Adult barnacles carried fertilised eggs from April throughout September, and the percentage of individuals with egg masses correlated positively with air but not seawater temperature. Brooding success was greater with average air temperature in excess of 14 °C during months of strong upwelling and presumed food availability. Functional ovaries and testes are available in the population all year round but fertilisation does not appear to occur during the winter months. Reproduction of P. pollicipes on the southwest coast of the Algarve appears closely linked to the upwelling phenomenon with the rate of deposition of gonadal tissue probably determined by environmental temperature. Laboratory and field observations permitted to conclude that P. pollicipes is an obligate cross-fertiliser. Isolated and communal individuals were observed to carry ripe ovaries and seminal vesicles filled with sperm at the same time but fertilisation took place only on communal individuals. Increasing numbers of isolated individuals are found on the southwest coast of Portugal, probably as the result of an intense fishery. The assessment of the fishery impact on the natural population and the development of management policies for the fishery are imperative future measures in order to maintain the recruitment levels. Enforcement of reserve areas may prove a practical solution for Pollicipes management. Protected populations could serve as stocks for recruitment to other areas. A series of protected areas around the coastline would need to be established in areas that could easily be monitored and, if needed, physically protected. It might also be feasible to rotate areas every 3-4 years resulting in a better quality and increased quantity of P. pollicipes entering the fishery.
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Elbourne, Peter David. "Ecological role of an adult-derived, waterborne cue in cyprid settlement in the barnacle balanus amphitrite Darwin." Thesis, University of Newcastle Upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515026.
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Guo, Lian W. "Effects of Variable and Constant Acclimation Regimes on the Upper Thermal Tolerance of Intertidal Barnacle, Balanus Glandula." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/scripps_theses/331.
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As a unique habitat that encompasses steep environmental gradients, it is important to evaluate threats posed to the intertidal zone by rapid climate change. It is thought that intertidal ectotherms are living close to their physiological limit; therefore slight changes in temperature could result in high levels of mortality. Past studies on intertidal species measured thermal tolerance under constant temperatures, neglecting to consider the impacts of natural variation in field temperatures. I conducted a study on the barnacle, Balanus glandula, to assess if a variable thermal environment would alter thermal tolerance. Barnacles were acclimated in an intertidal mesocosm to either daily cold (maximum 20.4◦C), daily warm (maximum 26.5◦C), or variable (two days cold, two days warm) low-tide temperatures. I measured each barnacle’s critical thermal maximum (CTmax) by increasing air temperature 6◦C/hour and identifying the point at which the barnacle ceased to function. Barnacles exposed to any warm temperatures demonstrated an increased thermal tolerance, suggesting that this population of barnacles is capable of shifting their thermal maximum. Furthermore, acclimation to thermal heterogeneity raised thermal maximum, reinforcing the need for future thermal tolerance studies to incorporate biologically-relevant thermal regimes in laboratory experiments. These results demonstrate that B. glandula in the field are well-adapted for increasing air temperatures.
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Lang, Alison. "Individual behaviour and population ecology : developing an individual based model for the Svalbard population of barnacle geese." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302157.
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