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Tesis sobre el tema "Marine biology"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Ridruejo, Carlos Mateo. "Isla del Rey : a marine biology center." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/69353.

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Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 1996.<br>Includes bibliographical references (p. 78-79).<br>In our changing times many of our necessities have geared us to search for new spaces that can accommodate them. This thesis attempts to devise the use and expansion of a distinguished 18th Century building dominating a small island, Isla del Rey; in the deep sea port, Port de Mao, of Menorca. The task allows for the exploration of a specific type of intervention, which transforms both the isolated object of the historical building and the landscape of th

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2

Klanjšček, Tin. "Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34623.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 2006.<br>"June 2006."<br>Includes bibliographical references.<br>Energy intake of individuals affects growth of organisms and, therefore, populations. Persistent lipophilic toxicants acquired with the energy can bioaccumulate and harm individuals. Marine mammals are particularly vulnerable because of their large energy requirements, and transfer of energy and toxicants from mothers to their young during gestation and lactation. Dynamic energy budget (DEB) models for energy assimilation and utilization, coupled with pharm

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3

Shoji, Akiko. "Incubation strategy in marine birds." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28466.

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The incubation shift length of the Ancient Murrelet ( Synthliboramphus antiquus), an exceptionally long and varied for an auk. I studied colonies of this species at East Limestone Island (1993-1995, 2002-2003: data collected by Laskeek Bay Conservation Society) and Reef Island (2007-2008), Haida Gwaii, British Columbia. Incubation shift length was correlated between pair members and my results show that maintaining incubation schedule was an essential component of reproductive success. Incubation shift length varied in response to prevailing local weather and sea conditions (e.g. wind speed, w

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4

Jones, Angela M. "Aspects of the biology of some marine ascaridoid nematodes." Thesis, University of Stirling, 1994. http://hdl.handle.net/1893/1498.

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Larval Anisakis simplex, Pseudoterranova decipiens, Contracaecum osculatum and larvae and adults of Hysterothylacium aduncum were recovered from specimens of cod, haddock, blue whiting and bull rout; however, only A.simplex were retrieved from long rough dab. The epidemiology of infection by these four nematode species was examined both in whole fish, and in individual host tissues and organs. Frequency distributions of nematodes were found to be generally overdispersed in fish. Preliminary investigations revealed no strong evidence to suggest that competi tive interactions occurred between as

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5

Reyes, Nikolle Susanne. "Marine bacterial isolates utilize unique mercury resistance mechanisms." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/25416.

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6

Foor, Brandon. "The biology and macroparasites of the sixgill sawshark Pliotrema warreni." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25303.

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Thirty-two specimens of the sixgill sawshark, Pliotrema warreni, were trawled near Bird Island in Algoa Bay on the Eastern coast of South Africa in April and May 2015. The specimens were examined for anatomical proportions, reproductive characteristics, diet, and parasite assemblages. Several external measurements were collected including mass, total length, standard length, girth, rostrum length, interoccular to pre-caudal length, first dorsal origin to second dorsal origin, first dorsal origin to pre-caudal origin, and mouth width. The equation for mass (g) vs. total length (mm) was ln(Mass)

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7

Pujade, Laura. "Development of a biomarker panel for identifying stressed marine mammals." Scholarly Commons, 2019. https://scholarlycommons.pacific.edu/uop_etds/3587.

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Increasing anthropogenic disturbance in marine ecosystems such as fishing, oil-drilling, and noise pollution can have detrimental effects on the reproduction and survival of apex predators such as marine mammals. Stress activates the hypothalamic-pituitary-adrenal (HPA) axis, resulting in increased circulating glucocorticoid (GCs) hormones, which alter expression of target genes encoding metabolic enzymes and other mediators of stress. Prolonged HPA axis stimulation may increase catabolism of nutrient stores and suppress immune and reproductive functions, impacting the fitness of marine mammal

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8

Stringer, Geraldine A. "The edge observed : island landscape for a marine biology facility." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/78973.

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Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 1987.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.<br>Includes bibliographical references (p. 70).<br>This thesis explores the concept of edges through observation and design. The intent of the observation/design is to understand and to illustrate possibilities for design that will enrich the experience of the built environment. For a building to start having reciprocal relationships with inside and outside territories, its structure and skin configurations must not be only one sided containments, but begin

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9

Grange, Laura Joanne. "Reproductive success in Antarctic marine invertebrates." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/41355/.

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The nearshore Antarctic marine environment is unique, characterised by low but constant temperatures that contrast with an intense peak in productivity. As a result of this stenothermal environment, energy input has a profound ecological effect. These conditions have developed over several millions of years and have resulted in an animal physiology that is highly stenothermal and sometimes closely coupled with the seasonal food supply, e.g. reproductive periodicity and food storage. Therefore, Antarctic marine animals are likely to be amongst the most vulnerable species worldwide to environmen

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10

Fullarton, J. Gregor. "Lipid biomarkers in marine symbiotic systems." Thesis, University of Stirling, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384931.

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11

Matich, Philip. "Environmental and Individual Factors Shaping the Habitat Use and Trophic Interactions of Juvenile Bull Sharks (Carcharhinus leucas) in a Subtropical Estuary." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1236.

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Top predators serve important roles within their respective ecosystem through top-down and bottom-up effects, yet understanding how these roles vary among individuals within predator populations is still in its early stages. Such individuality can have important implications for the functional roles predators play within their respective ecosystems. Therefore, elucidating the factors that drive persistent individual differences within populations is crucial for understanding how individuals, and in turn populations, will respond to environmental changes and anthropogenic stressors, and the imp

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12

Bossart, Gregory D. "Immunocytes of the Atlantic bottlenose dolphin (Tursiops truncatus) and West Indian manatee (Trichechus manatus latirostris) : morphologic characterizations and correlations between healthy and disease states under free-ranging and captive conditions." FIU Digital Commons, 1995. http://digitalcommons.fiu.edu/etd/1772.

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Interest in the health of marine mammals has increased due, in part, to the attention given to human impact on the marine environment. Recent mass strandings of the Atlantic bottlenose dolphin (Tursiops truncatus) and rising mortalities of the endangered Florida manatee (Trichechus manatus latirostris) have raised questions on the extent to which pollution, infectious disease, "stress," and captivity influence the immune system of these animals. This study has provided the first in-depth characterization of immunocytes in the peripheral blood of dolphins (n=180) and manatees (n=56). Immunocyte

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13

Dunphy-Daly, Meagan Mná. "Temporal variation in dwarf sperm whale (Kogia sima) habitat use and group size off Great Abaco Island, the Bahamas." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/3101.

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Dwarf sperm whales, Kogia sima, are among the most commonly stranded yet least known pelagic cetaceans. I assessed seasonal and spatial variation in dwarf sperm whale group size and abundance off Great Abaco Island, the Bahamas. After correcting for survey effort and variation in sighting efficiency among sea states, I found that dwarf sperm whale group size and habitat use varied seasonally. In summer, dwarf sperm whale groups were small (median = 2.5, range = 1-8) and were found only in the two deep habitats within the study area (slope 400-900 m, deep 900-1600 in). In winter, group sizes in

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14

Cubillos-Ruiz, Andrés Fernando, Jessica Weidemier Thompson, Jamie William Becker, et al. "Ecology and evolution of lanthipeptides in marine picocyanobacteria." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101829.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2015.<br>Cataloged from PDF version of thesis. Each chapter with its own abstract. Each appendix with its own summary.<br>Includes bibliographical references.<br>Microbial secondary metabolites are among the most structurally and functionally complex molecules in nature. Lanthipeptides are ribosomally derived peptide secondary metabolites that undergo extensive post-translational modification. Most lanthipeptides are bactericidal but they are also known to act as signaling molecules or morphogenetic peptides, neverth

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15

Thompson, Luke Richard. "Auxiliary metabolic genes in viruses infecting marine cyanobacteria." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/57562.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 2010.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student submitted PDF version of thesis.<br>Includes bibliographical references (p. 281-293).<br>Marine viruses shape the diversity and biogeochemical role of their microbial hosts. Cyanophages that infect the cyanobacteria Prochlorococcus and Synechococcus often carry metabolic genes not found in other bacteriophages. The proteins encoded by these `

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16

Kruger, Lisa Maria. "Feeding biology of intertidal sea anemones in the south-western Cape." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/19423.

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The species composition, abundance and distribution of intertidal sea anemone assemblages were investigated by means of line-transects at two sites on the Cape Peninsula - Wooley's Pool in False Bay and Blouberg in Table Bay. A single species, Bunodactis reynaudi dominated at Blouberg (average density 901 running m⁻¹). Juveniles < 35mm basal diameter) were particularly abundant in mussel beds. Seven species exhibiting clear vertical zonation were found at Wooley's Pool (average density 658 m⁻¹). High-shore species were Actinia equina and Anthothoe stimpsoni. A. stimpsoni was the smallest (9.1m

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17

Miller, Robert J. "Ecological factors shaping subtidal rock wall communities in the Gulf of Maine." View this thesis online, 2005. http://libraries.maine.edu/gateway/oroauth.asp?file=orono/etheses/37803141.pdf.

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Thesis (Ph.D.)--University of Massachusetts Boston, 2005.<br>Title from PDF title page. Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (p. 82-102). Also issued in print.

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18

Roel, Beatriz Adelaida. "Stock assessment of the Chokka Squid : Loligo vulgaris reynaudii." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/19576.

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Summary in English.<br>Bibliography: p. [199]-210.<br>The primary aim of the study was to assess the status and productivity of chokka squid. Main hypotheses examined are the following: that the sharp decline in the trawl fishery catch per unit effort (CPUE) data in the early 1980s, reflects a real decline in the trawlers catch rate; that the decline in the trawl CPUE index is caused by the jig fishery removing the biomass that otherwise would be available to the trawl fishery; that the jig fishery "disturbs" the spawning process and causes a decline in subsequent recruitment. Catch and effor

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19

Harington, Amy. "Trace metal effects on phytoplankton in subpolar seas with special emphasis on coccolithophores." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27354.

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Coccolithophores are a biogeochemically important phytoplankton group, fulfilling an important role in the global carbon cycle through primary production and the formation and export of calcium carbonate. Despite this biogeochemical importance, relatively little is known about their ecophysiology, for example their response to nutrient availability in terms of both macronutrient (nitrate, phosphate) and micronutrient (trace metal) or how this impacts on their competition with other phytoplankton groups (e.g. diatoms, Synechococcus). Hence, this study investigated the response of coccolithophor

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20

Nibam, Abi Henry. "Reproductive biology and diet of the St. Joseph (Callorhinchus capensis) in South Africa." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10791.

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Includes abstract.<br>Includes bibliographical references (p. 72-84).<br>The reproductive biology of the commercially exploited fish St. Joseph or Cape Elephant fish Callorhinchus capensis, is described based on 173 fishes caught by gillnets in October 2010 from Velddrif along the west coast of South Africa. Segregation by sex was reflected by a difference in sex ratio from 1:1 for females to males fishes collected from the fishery (?2 = 16.23, d.f. = 1, p = 5.6 x 10-5).

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21

Chien, Diana M. "Fine-scale ecological dynamics of closely related marine microbes." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105636.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Microbial dynamics in the environment are major drivers of global biogeochemical cycles; hence there is great interest in characterizing their rates and causes. While dynamics are affected by processes across many spatiotemporal scales, and even closely related microbes are known to vary in their ecological distributions, most work has characterized dynamics at bulk scales and with low genetic resolution. Thus, little is known a

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22

Willey, Joanne M. "Characterization of swimming motility in a marine unicellular cyanobacterium." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14611.

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23

Wänstrand, Ingrid. "Pigment and Thiamine Dynamics in Marine Phytoplankton and Copepods." Doctoral thesis, Uppsala universitet, Evolutionsbiologi, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4560.

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Based on a field study and several mesocosm experiments, I evaluated the use of pigments as chemotaxonomical biomarkers for phytoplankton community composition in the Baltic Sea and I examined effects of inorganic nutrients on the dynamics of carotenoids and thiamine (vitamin B1) at the phytoplankton–copepod level in marine pelagic food webs. My results show that HPLC pigment analysis combined with CHEMTAX data processing was an accurate alternative to microscopic analysis of Baltic Sea phytoplankton. Experimental supply of N, P and Si affected copepod growth and biochemical status via changes

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24

Kim, Jun-Woo. "Copper requirements of marine diatoms of the Thalassiosirales." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106254.

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Copper (Cu), one of about seven essential metals used by photoautotrophs, is a limiting resource in some parts of the ocean because of its low and variable concentration. This thesis examined copper dependence of growth, Cu uptake and quotas of diatoms of the Thalassiosirales isolated from different ocean habitats. A major finding of the research was that Cu quotas of diatoms of the Thalassiosirales are dependent on the type of photosynthetic electron transport gene they contain viz. plastocyanin; encoding a Cu-dependent protein versus cytochrome c6; encoding a Fe-dependent protein. Increased

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25

Porter, Donovan Stuart. "Isolation and characterisation of antibiotic-producing marine actinomycetes." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/8591.

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Bibliography: leaves 94-102.<br>Resistance to antibiotics poses a serious threat to healthcare and new drugs are needed. This is especially true for tuberculosis (TB), which is at epidemic levels in South Africa. Multidrug-resistance in Mycobacterium tuberculosis makes TB more difﬁcult and expensive to treat and increases mortality rates. The surfaces of 12 seaweed species found in South African coastal waters were screened for the presence of antibiotic-producing actinomycetes. Of the 67 strains isolated, 26 exhibited antibacterial activity against Mycobacterium aurum A+ and for Enterococcus

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26

Johnston, Olivia Ruth. "Distribution and biology of the marine invasive bivalve Theora lubrica (Semelidae)." Thesis, University of Canterbury. School of Biological Sciences, 2005. http://hdl.handle.net/10092/2453.

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This study examined aspects of the biology and distribution of the marine invasive bivalve Theora lubrica in the Lyttelton Basin from two distinct sampling areas. Samples were collected monthly, over a 13 month period (January 2004 and January 2005), with particular emphasis on seasonal sedimentary characteristics and contamination. The sample sites consisted of five Port sites and five Harbour sites. They were sampled using a 20 litre anchor dredge. In winter and summer, core samples from each of the sample sites were collected, and the top 1.5cm of sediment was used to obtain sediment charac

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27

Carloni, Riccardo. "Electron paramagnetic resonance applications: from drug discovery to marine biology studies." Doctoral thesis, Urbino, 2021. http://hdl.handle.net/11576/2682203.

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28

Ilikchyan, Irina N. "Phosphonates Utilization in Marine and Freshwater Picocyanobacteria." Bowling Green State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1229969527.

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29

Cunniff, Kevin M. "Phenology, sexual reproduction, and the factors affecting sexual reproduction of the marine angiosperm, Thalassia testudinum, in the Florida Keys National Marine Sanctuary (FKNMS)." FIU Digital Commons, 2005. http://digitalcommons.fiu.edu/etd/2691.

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This study investigated phenology and the factors affecting sexual reproduction of Thalassia testudinum in the FKNMS. Flowering was assessed at 30 permanent monitoring sites via direct observation and age reconstruction techniques of seagrass cores in 2002. The mean flowering frequency was 1.49%, was spatially variable, and exhibited sex-specific timing in floral anthesis. Historical flowering reconstruction demonstrated that flowering frequencies are not temporally variable. Floral sex ratios were female-biased, spatially variable, and likely temporally variable. Relative nitrogen availabilit

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30

Chon, Suet-ling, and 莊雪玲. "Remote sensing applications in studying marine biological processes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31255826.

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31

Gray, Victoria A. "Physiological consequences of temperature stress on the marine snail, Lottia gigantea." California State University, Long Beach, 2013.

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32

Salter, Lesley. "Effects of Barotrauma on Four Species of Pacific Rockfishes (Sebastes spp.)." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2007.

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Physoclistic fish, such as Pacific rockfishes (genus Sebastes), have closed swim bladders that help them regulate their buoyancy. When anglers catch these fish and reel them to the surface, gases within their swim bladder expand due to the decrease in pressure. This can cause their swim bladder to over inflate––a condition known as barotrauma. Overly buoyant fish experiencing barotrauma often struggle to swim back to dwelling depth if released at the ocean’s surface. These fish may experience high rates of mortality by thermal shock caused by the warmer surface temperatures, starvation, predat

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33

Shuuluka, Diina. "Ecophysiological studies of three South African Ulva species from integrated seaweed." Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10903.

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Includes bibliographical references (leaves 210-273).<br>In South Africa, Ulva cultivation is of paramount importance to the marine aquaculture industry. Three local Ulva species (Ulva lactuca Linnaeus, Ulva rigida C. Agardh and Ulva capensis Areschoug) were selected for this research. The first two are currently cultivated on abalone farms for abalone feed and for use as bio-filters, and Ulva capensis was included because it is morphologically and biogeographically distinct from Ulva rigida in nature, despite the inability of molecular methods to separate them. Ulva rigida was collected at I

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34

Mead, Angela. "Climate and Bioinvasives drivers of change on South African Rocky shores?" Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11308.

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Includes abstract.<br>Includes bibliographical references.<br>The overall aims of the thesis were to assess spatio-temporal change in macro species assemblages at sites located around the South African coast. Detected changes were considered in parallel with regional patterns of bioinvasion and climate change driven shifts in temperature trends over comparable time scales.

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35

Sankar, Kishan. "Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions." Bachelor's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/26051.

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Two morphs of Patiriella exigua occur in South Africa. These morphs occur on opposite sides of a temperature divide present at Cape Point. The green morph occurring on the West Coast (cold temperate) and the mottled morph occurring on the South Coast (warm temperate). In a previous study by Katherine Dunbar these two morphs were shown to be the same species. This project tests if there is a physiological difference between the two morphs of P. exigua. This was achieved by observing the activity coefficient of righting response of the two morphs of P. exigua under different temperatures and dis

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Innes, Sheona. "Tropical intertidal seaweed turf communities of Jesser Point, Sodwana Bay, South Africa." Bachelor's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/26378.

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Algal turfs play an important role in both tropical and temperate reef ecology, supporting a diverse array of macrofauna as well as being primary producers within both intertidal and subtidal ecosystems. Biodiversity and biomass patterns of the intertidal algal turfs at Sodwana Bay, South Africa have not yet been established so this study was undertaken to investigate these. It was hypothesised that both biodiversity and biomass would decrease with increasing height along the shore, as well as that sediment would have an effect on the community composition of the turfs. The community was sampl

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Olivieri, Emilia T. "Phytoplankton growth and zooplankton grazing in the southern Benguela current." Doctoral thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/22590.

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Bibliography: pages 135-146.<br>The development and production of several phytoplankton communities and the consumption of these communities plankton were investigated in newly by herbivorous mesozooupwelled waters of the southern Benguela Current by means of an electronic counting and sizing technique (Coulter counter). A feasibility study was initiated to test the accuracy of the Coulter counter (Model TAII) in estimating phytoplankton size and biomass in fresh and preserved samples from the Benguela current. Counting phytoplankton using this method gave a higher degree of reproducibility th

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38

Levy, Sarah Bernadette. "How reliable is morphological species delimitation in kelp? : a study of two closely related South African Ecklonia species." Bachelor's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/12923.

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Includes bibliographical references.<br>Ecklonia maxima and Ecklonia radiata are both kelp bed forming macroalgae along the South African coast, and the latter is also found in considerable abundance in Australia and New Zealand. Genetically they exist as two distinct species and can usually be differentiated morphologically, especially when occurring as geographically separate entities. However, they do appear to intergrade when growing together, where plants of apparent intermediate and indeterminate morphology have been observed. This study tested the reliability of morphology in separating

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39

Szeinfeld, Edy Sylvia Valdes. "Abundance and mortality of anchovy eggs caused by cannibalism and intraguild predation, and the potential effect on anchovy recruitment and clupeoid fluctuations." Doctoral thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/26106.

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This thesis is structured in the form of five main chapters, each written in the form of an independent paper and supported by a general conclusion and one previously published paper on the same general theme. The central theme is the dynamics, ecology and evolution of intraspecific and intraguild predation - specifically the determination of an interacting mechanism between the guild fish species Engraulis capensis and Sardinops ocellatus and its significance for future fisheries management.

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40

Raw, Robert Nicolas Vause. "Population structure, site fidelity, and fine-scale habitat use of the broadnose sevengill shark, Notorynchus cepedianusat Pyramid rock, False Bay, South Africa." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/11312.

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Includes bibliographical references.<br>The aims of this study were to investigate elements of the demographics, fine-scale habitat use and site fidelity of sevengill sharks. The study was conducted at an aggregation hotspot within a Marine Protected Area, near Miller’s Point in False Bay, South Africa.

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41

Shannon, Lynne Jane. "Modelling the oceanographic transport of young Cape anchovy Engraulis capensis by advective processes off South Africa." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/21784.

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Bibliography: pages 107-121.<br>A Monte-Carlo type model has been developed to investigate the importance of passive transport by currents above the thermocline for anchovy recruitment off South Africa. Simulation studies indicate that mean year-class strength of Cape anchovy is relatively robust to altered advective processes off South Africa. This occurs despite the fact that changed flow alters the likelihood of offshore advection and hence losses of anchovy from the system. Two different approaches have been taken to address the effects of altered advection, and the applicability of each i

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42

Wright, Amy Grace. "Deep water parapagurid hermit crabs: their distribution, abundance, population structure and associations in the Southern Benguela." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25650.

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The parapagurids Sympagurus dimorphus (Studer, 1883) and Parapagurus bouvieri (Stebbing, 1910) dominate South African deeper-water benthic invertebrate communities. Samples from the 2016 DAFF bi-annual hake demersal research trawl surveys provided data on population structure and morphology. Since these species forego the use of "traditional" gastropod shells in favour of symbiotically-associated Epizoanthus pseudoshells, these data were also used to investigate parameters of pseudoshell association. S. dimorphus to have a female-biased sex ratio of 1:1.5, and P. bouvieri of 1:1. The proportio

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Pasnin, Charles Olivier Arvin. "A marine systematic conservation plan for Rodrigues Island, Western Indian Ocean." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11054.

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Includes abstract.<br>Includes bibliographical references (p. 53-59).<br>In 2007 the local government of Rodrigues gazetted four marine reserves in the north of the island based on knowledge and insights from stakeholders, mainly from the fishing community. In order to verify the stakeholder-based design, a marine reserve network was designed using Marxan, a systematic conservation planning programme.

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Loosen, Kristina. "Predictors of white shark Carcharodon carcharias presence at two recreational beaches in a major metropole." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27493.

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The presence of white sharks Carcharodon carcharias in False Bay, South Africa follows a clear seasonal cycle. In the austral winter months, white sharks aggregate around Seal Island with female sharks in particular moving to the inshore areas in summer. What triggers these fine scale migrations at one of the largest white shark aggregation sites in the world remains a subject of debate. Previous research identified the environmental variables, water temperature and lunar phase, as significant influences on white shark presence inshore. In this study, I attempt to investigate the influence of

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45

Gersun, Leanne. "The abundance and diversity patterns of seaweed communities on natural and artificial substrata at Sodwana Bay, South Africa." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13051.

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Includes bibliographical references.<br>The high latitude coral communities of southern Africa suffered minimal impacts during mass bleaching events in the recent past. However, during the 2005 warm-water anomaly in the southern Indian Ocean, coral bleaching reached unprecedented levels. There is surprisingly little known about the fate of bleached corals, which may either regain their zooxanthellae and recover, or may die, in which case they generally become overgrown by macroalgae. The nature and dynamics of this algal overgrowth are not well understood. This study was done on Two-Mile Reef,

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46

Winckler, Heidi. "The application of univariate and distributional analyses to assess the impacts of diamond mining on marine macrofauna off the Namibian Coast." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/17969.

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Bibliography: pages 114-116.<br>This study is one of three based on grab samples of macrobenthos obtained before and at different times after mining for diamonds off the coast of Namibia. The first study dealt with multivariate clustering analysis of the first samples before and after mining. The second study focused on recovery times after mining and this study is aimed at estimating the amount of stress encountered by benthic communities, for comparision with the descriptive multivariate approach. Two research areas, classified as 'northern' and 'southern' were investigated. Data were aggreg

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47

Plagányi, Éva Elizabeth. "A model of copepod population dynamics in the southern Benguela upwelling region." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/14969.

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Bibliography: leaves 190-216.<br>A simple population dynamics model is constructed to simulate temporal variability in the biomass of a dominant copepod Calanoides carinatus (Copepoda: Calanoida) along the West Coast region of South Africa. C. carinatus is extensively preyed upon by the commercially important anchovy Engraulis capensis and variability in zooplankton production may serve as an useful predictor of variability in anchovy recruitment levels. The model developed here circumvents the need to include a large number of parameters because it uses satellite-derived estimates of chloroph

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48

Baker, Shirley Marie. "Oyster (Crassostrea virginica) metamorphosis: Effects of low oxygen." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539616556.

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The objective of my research was to examine the physiology and behavior of metamorphosing oysters, Crassostrea virginica, and to investigate the effects of low oxygen stress on metamorphic processes. Specifically, I examined the effects of hypoxia (20% of air saturation) and microxia (&<&1% of air saturation) on settlement, survival, growth, morphology, metabolic rate and feeding on post-settlement oysters. All of the functions I measured were adversely affected by hypoxia and microxia, compared to normoxic controls. Survival times indicate that, like larvae and adults, post-settlement oysters

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Brylawski, Bryce J. "Cultural eutrophication and the clam Macoma balthica: Evidence for trophic disruption and effects on blue crabs." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539616585.

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Cultural eutrophication (CE) is the allochthonous input introduction of a quantity of matter, such as sediments, organic material, or nutrients, into a water body over the pre-anthropogenic (natural) levels. In most coastal estuaries CE has come to refer primarily to an increase in the concentration of phyto-nutrients. CE has been identified as the cause of very graphic phenomena such as hypoxia and fish kills. In this work I examine the potential for CE to alter the composition of the primary producer community and potentially alter or disrupt the benthic food web, using Macoma balthica as an

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Robison, Clara L. "Impacts of Margalefidinium polykrikoides and Alexandrium monilatum on Oysters Cultured in Lower Chesapeake Bay." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1593092072.

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Harmful algal blooms (HABs) are expanding globally and are anticipated to continue increasing with climate change. Two dinoflagellate species, Margalefidinium polykrikoides and Alexandrium monilatum, form extensive and dense blooms most summers in the lower Chesapeake Bay. Alexandrium monilatum, which produces the toxin goniodomin A, tends to bloom soon after M. polykrikoides, for which a toxin has not yet been identified. Previous laboratory studies and a more limited number of field studies indicate mortality and pathology in multiple shellfish species associated with exposure to M. polykrik

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