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Dissertations / Theses on the topic 'Sea urchins'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Jones, Kate. "Monitoring, Assessment, and Management of the Green Sea Urchin (Strongylocentrotus droebachiensis) Fishery in Maine." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/JonesKX2006.pdf.

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2

Kling, Ashley Lindsey. "Effects of Formulated Feeds and Saccharina Latissima on Growth, Gonadal-Somatic Index, and Gonad Color in Grow-Out Stage Green Sea Urchins, Strongylocentrotus droebachiensis, in Land-Based Echiniculture." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/KlingAL2009.pdf.

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3

Lau, Chi Chung Dickey. "Population variability and impact of sea urchin Anthocidaris crassispina in Hong Kong." HKBU Institutional Repository, 2011. https://repository.hkbu.edu.hk/etd_ra/1298.

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4

Heyland, Andreas. "Thyroid hormone-like function in echinoids a modular signaling system coopted for larval development and critical for life history evolution /." Connect to this title online, 2004. http://purl.fcla.edu/fcla/etd/UFE0004542.

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5

Sweijd, Neville Anthony. "The digestive mechanisms of an intertidal grazer, the sea urchin Parechinus angulosus." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005346.

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Echinoids are important grazers in the near-shore ecosystem and can significantly effect their ecology. The sea urchin Parechinus angulosus occurs inter- and subtidally along the southern African coast. Within this range it consumes an extremely wide variety of algae. Since algal cell walls have an almost species specific chemical composition, the question arises as to how it can digest the algae that it consumes. In order to investigate the digestive mechanisms employed by P. angulosus, an ultrastructural study of the gut was undertaken to characterize the tissue and identify functional regio

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6

Chiu, Sein-tuck. "Aspects of the ecology of Anthocidaris crassispina (echinodermata: echinoidea) in Hong Kong /." [Hong Kong : University of Hong Kong], 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1233571X.

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7

Farquhar, Michael Robert. "Interspecific interactions of the sea urchin Parechinus angulosus and the effect of variations in microhabitat availability." Thesis, Rhodes University, 1995. http://hdl.handle.net/10962/d1005406.

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Intertidal populations of the sea urchin Parechinus angulosus were examined at seven sites along the south and east coasts of South Africa. At the five southerly sites, P. angulosus occurred in allopatry, while, at the two northerly sites, it occurred in sympatry with several species of Indopacific sea urchins. At the five southerly sites, there was a significant correlation of number of sea urchins per pool with the surface area of the overhang in that pool. This relationship broke down for P. angulosus at the two northerly sites, where there was a significant correlation between these two fa

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8

Tauchman, Eric Gary. "Effects of ultraviolet radiation on developing variegated sea urchins, lytechinus variegatus." [Pensacola, Fla.] : University of West Florida, 2008. http://purl.fcla.edu/fcla/etd/WFE0000142.

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9

Olquín, Irma. "Speciation in marine systems : the case study of the sea urchin Arbacia incisa (Agassiz 1863) /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Thesis (Ph. D.)--San Diego State University, and University of California, Davis, 2003.<br>Includes bibliographical references (leaves 65-72). Also available via the World Wide Web. (Restricted to UC campuses)

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10

Cowart, Dominique Alexandria. "Salinity sensitivity of embryos of the Antarctic sea urchin, Sterechinus neumayeri." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 47 p, 2008. http://proquest.umi.com/pqdweb?did=1597631011&sid=37&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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11

Pisut, Daniel P. (Daniel Peter). "The distance chemosensory behavior of the sea urchin Lytechinus variegatus." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5129.

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Many organisms that lack vision rely on chemical signals to glean information from their environment. Little is known, however, about the ability of sea urchins to detect and respond to such signals. This lack of understanding is especially surprising given the ecological impact of urchins in their respective communities. Regardless of geography, urchins exert strong top down control of plants, algae, and sedentary invertebrates, and these effects are especially evident when urchins, or urchin predators, are removed from an ecosystem. Facultative omnivorous species such as Lytechinus varie

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12

Husby, Kjell Runar. "Development of a Grading Machine for Sea Urchins." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22711.

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A preliminary study, conducted the fall of 2012, formed the basis for this master thesis. The thesis is issued by NTNU, and it is a part of a project in which Searis AS, Troms Kråkebolle and Norway Sea Urchins are participants. Searis AS is a start-up company, in which the student is a participant. Troms Kråkebolle and Norway Sea Urchins perform aquaculture farming, and wild catch, of sea urchins, respectively.The project was initated because of the need to automate the manual grading of sea urchins. The grading process is time consuming and increase cost for the customer. The gradin

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13

Filander, Zoleka. "Systematics and biodiversity of South African sea urchins." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/12925.

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Includes bibliographical references.<br>The South African Echinoidea (Echinodermata) were last reviewed by Clark & Courtman Stock (1976) and numerous unidentified specimens and records have accumulated since that time, plus there have been many taxonomic changes within the group. Therefore this study, which forms the first of its kind in 37 years, aims to update knowledge on the diversity and distribution patterns of South African echinoids and to provide a user-friendly, well-illustrated guide to the group. Dry and wet specimens, particularly those within the extensive collections of the Izi

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14

Lawson, T. N. "Physical mapping of an early sea urchin gene battery from Parenchinus angulosus." Master's thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/17701.

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Bibliography: pages 95-99.<br>The aim of this project was to characterise an early histone gene battery isolated from Parenchinus angulosus. An early histone gene battery (named H27) which was believed to have been isolated from Parenchinus angulosus, appeared by restriction enzyme mapping and partial sequencing to be identical to H22, an early histone gene battery isolated from Psammechinus miliaris. (This latter gene was obtained from M. Birnstiel.) This was further confirmed by electron microscopy, and proved to be a convenient testing ground for the electron microscopic techniques of denat

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15

Bennett, Kathleen 1977. "The Complete Development of the Deep-Sea Cidaroid Urchin Cidaris blakei (Agassiz, 1878) With an Emphasis on the Hyaline Layer." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10169.

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xv, 63 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>Living echinoids comprise two major sister clades, the Euechinoidea and the Cidaroidea. Cidaroids first appeared during the lower Permian (~255 mya) and are considered to represent the primitive form of all other living echinoids. The present study of Cidaris blakei, a deep-sea planktotrophic cidaroid urchin, provides a description of development from fertilization through early juvenile stages and is the first report of a deep-s

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16

Muller, Cornelius Marthinus. "The phylogeographic population structure of the Cape sea urchin, Parechinus angulosus." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/6899.

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Thesis (MSc)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: South Africa's coastline is in the region of 3650kms and encompasses many different and dynamic marine environments. To enhance our current understanding of the population structure and gene flow patterns of intertidal zone marine species in this region, this study sets out to investigate the phylogeographic population structure of the Cape sea urchin, Parechinus angulosus, using mitochondrial and nuclear DNA sequence data collected in 2007 and 2008. Individuals were sampled from 18 geographic locations between southern Namibia

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17

Egana, Ana Luisa. "Analysis of the centrosome during sea urchin oogenesis and the characterization of sphedgehog expression and function during sea urchin embryogenesis /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2000.

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Thesis (Ph.D.)--Tufts University, 2000.<br>Adviser: Susan G. Ernst. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 91-118). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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18

Carboni, Stefano. "Research and development of hatchery techniques to optimise juvenile production of the edible sea urchin, Paracentrotus lividus." Thesis, University of Stirling, 2013. http://hdl.handle.net/1893/13178.

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Research and development in aquaculture has supported the knowledge-based development of the sector over the last decades. In particular, species diversification is playing an important role to ensure sustainability of the industry and helping to reduce pressure on wild stocks of those aquatic species for which farming technology is still at the early stages. Due to the increasing pressures on more traditional carnivorous marine finfish species (aquafeed reliance on fishmeal and fish oil, environmental impact, market price) low trophic organisms are receiving more attention to provide sustaina

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19

Younglao, Deborah. "Spawning, aggregation and recruitment in the black sea urchin Diadema antillarum." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64064.

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20

Swanson, Rebecca School of Biological Earth &amp Environmental Sciences UNSW. "Histamine ??? a naturally occurring settlement cue for larvae of the Australian sea urchin Holopneustes purpurascens." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2006. http://handle.unsw.edu.au/1959.4/27240.

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The importance of chemical cues in triggering the settlement of marine invertebrate larvae has long been recognised but very few such cues have been definitively identified. Larvae of the Australian sea urchin Holopneustes purpurascens, which lives enmeshed in the fronds of macroalgae, are induced to settle by a water-soluble cue produced by the host alga Delisea pulchra. This cue was previously identified as a floridoside-isethionic acid complex. I present evidence in this thesis which supports histamine as the true settlement cue for larval H. purpurascens. The settlement cue was isolated fr

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21

Vrable, David Joseph. "A recombinant GST-EMBP440 fusion protein from sea urchin embryos that has myosin binding capabilities /." Connect to online version, 1997. http://hdl.handle.net/1989/3741.

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22

Szulgit, Greg Karl. "Mechanical investigations of the mutable collagenous tissues of the echinoderms, Eucidaris tribuloides, Cucumaria frondosa, and Parastichopus parvimensis /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823697.

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23

Cunningham, John Alexander. "The evolution of developmental strategy in cretaceous spatangoid sea urchins." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511069.

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24

Gong, Zhiyuan. "Regulation of tubulin gene expression in sea urchin embryos." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74267.

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Regulation of tubulin gene expression in embryos of the sea urchin Lytechinus pictus has been experimentally investigated by use of cloned recombinant tubulin DNA and anti-tubulin antiserum. Tubulin synthesis appears to be autogenously regulated at the level of tubulin mRNA stability by the level of unpolymerized tubulin; i.e., the more unpolymerized tubulin, the less stable the tubulin mRNA. Destabilization of tubulin mRNA requires continued protein synthesis. Most of tubulin stored in eggs is unpolymerized; during embryogenesis the mass of tubulin per embryo changes little, but unpolymerized

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25

Conlon, Ronald A. "Underexpression of paternal genes in sea urchin interspecies hybrid embryos." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63341.

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26

Pelikan, Kellie C. "The Effects of Petroleum Pollutants on Sea Urchins Reproduction and Development." NSUWorks, 2015. http://nsuworks.nova.edu/occ_stuetd/401.

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Disturbances, such as mass pollution events, threaten the health of vulnerable ecosystems. Recent media attention has focused on the devastating mass oil spills, but daily petroleum input from recreational and commercial ship bilge release has been overlooked. The focus of this study was the effect of petroleum products found in bilge water on fertilization success and larval viability of two sea urchin species, Lytechinus variegatus and Eucidaris tribuloides. Unlike other pollutant studies that have focused on sperm characteristics and concentrations, I chose to examine how egg integrity was

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27

Dos, Reis Ferreira Claudio. "Polyhydroxylated Naphthoquinone Pigments in Biomineral Coloration of Paracentrotus lividus Sea Urchins." Electronic Thesis or Diss., Sorbonne université, 2025. http://www.theses.fr/2025SORUS031.

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Les oursins présentent des couleurs vives en raison de la présence de pigments de naphtoquinone polyhydroxylée (PHNQ) dans leur squelette biominéralisé (test et épines). Les PHNQs sont synthétisés dans des cellules spécialisées appelées cellules à sphérules rouges (RSCs). Les mécanismes de libération des PHNQs et de leur incorporation dans le minéral restent inconnus. Paracentrotus lividus présente généralement des couleurs violettes et vertes, et la relation chimique entre la composition des PHNQs et la couleur du biominéral est peu étudiée. Nous montrons ici que la couleur violette est due à

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28

Baron-Taltre, Benjamin. "The Rise and Fall of the Maine Sea Urchin Industry: A Failure of Management and Institutions?" Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/Baron-TaltreBX2005.pdf.

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29

Duerr, Heike Edith. "Molecular characterisation of neuropeptides in echinoderms." Thesis, Royal Holloway, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314294.

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30

Sardhalia, Vaskar. "Calcium carbonate-naphthoquinone hybrid pigments inspired by biomineral coloration in sea urchins." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS644.pdf.

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Les couleurs vives observées dans les biominéraux provenant d'oursins adultes, allant du violet au vert, sont attribuées à la présence de molécules de naphtoquinone polyhydroxylée (PHNQs). Ces PHNQs sont intégrés dans la calcite, probablement au cours de la croissance cristalline, se produisant via l'intermédiaire de précurseurs de carbonate de calcium amorphe (ACC). La formation de minéraux chez les oursins s'accompagne de changements de couleur dépendant du stade de minéralisation. Le spinochrome A, par exemple, présente une couleur rouge lorsqu'il est extrait des épines violettes de Paracen

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31

Miner, Benjamin G. "Evolution of phenotypic plasticity insights from echinoid larvae /." Connect to this title online, 2003. http://purl.fcla.edu/fcla/etd/UFE0001450.

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32

Montpetit, Isabelle. "Localization and characterization of an ectodermal protein of sea urchin embryos." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59519.

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In the urchin Strongylocentrotus purpuratus, the expression of the Spec3 gene is associated with the growth of cilia, one of the first morphogenetic events during development. The product of this gene was characterized using an antiserum raised against a peptide corresponding to the predicted amino-terminal portion of the protein. This thesis describes the localization of the Spec3 protein at different stages during embryonic development. Immunocytochemistry indicated that the protein is associated with cilia and Golgi complexes of ectodermal cells. Agents that inhibit protein synthesis and Go

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33

Riedemann, Johann. "Functional analysis and recombinant expression of a sea urchin G-string binding factor." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52277.

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Part of work presented in this thesis has been published: Regulation of gene expressions by GC-rich DNA cis-elements / J.P. Hapgood, J. Riedemann and S.D. Scherer in Cell biology international, vol. 25, 2001.<br>Thesis (MSc)--Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: The sea urchin G-string binding factor 1 (suGF1) has previously been shown to bind with high affinity and selectivity to stretches of contiguous deoxyguanosine residues, a DNA motif found in the upstream regions of many unrelated genes from several organisms. It has been proposed that suGF1 plays a role in transcript

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34

Cole, Russell Gavin. "Distributional relationships among subtidal algae, sea urchins and reef fish in northeastern New Zealand." Thesis, University of Auckland, 1993. http://hdl.handle.net/2292/1912.

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Interactions among large brown macroalgae, sea urchins, and fishes were investigated in northeastern New Zealand during the period 1988 - 1993. The Cape Rodney to Okakari Point Marine Reserve was the site of many of these investigations. The patterns of abundance of large brown macroalgae and urchins down depth gradients over a wide geographic range were compared with those reported from earlier studies, and 3 major trends were identified. First, the fucoid alga Carpophyllum flexuosum now occurs at many sites which are exposed to wave action, in contrast to earlier studies. This alga occurred

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35

Harianto, Januar. "Physiological response of adult and juvenile sea urchins (Heliocidaris erythrogramma) to warming and acidification." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20420.

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Approximately 25 % to 40 % of anthropogenic carbon dioxide (CO2) emissions have been absorbed by the oceans, influencing the physical and chemical properties of seawater and contributing to ocean warming (OW) and acidification (OA). This thesis investigated the impact of long-term exposure to OW and OA, at levels predicted for up to the years 2050 and 2100 on the physiological responses of the sea urchin, Heliocidaris erythrogramma. This species is an ecologically important benthic ecosystem engineer in south-east Australia with the ability to reshape community assemblages through its herbivor

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36

Taylor, Anna M. "Effects of dietary carbohydrate on weight gain and gonad production in juvenile sea urchins, Lytechinus variegatus." Birmingham, Ala. : University of Alabama at Birmingham, 2006. http://www.mhsl.uab.edu/dt/2006m/taylor.pdf.

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37

Yamamori, Luna. "Ecology and adaptative evolution of gastropods and cirripeds symbiotic with sea urchins in marine rocky reefs." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263723.

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京都大学<br>新制・課程博士<br>博士(人間・環境学)<br>甲第23262号<br>人博第977号<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授加藤眞, 教授市岡孝朗, 准教授西川完途<br>学位規則第4条第1項該当<br>Doctor of Human and Environmental Studies<br>Kyoto University<br>DGAM

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38

Chiu, Sein-tuck, and 趙善德. "Aspects of the ecology of Anthocidaris crassispina (echinodermata: echinoidea) in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31230805.

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39

Fabrèges, Dimitri. "Phenotypic Variations In Animal Morphogenesis : Sea Urchin Twins And Cloned Rabbits." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS010/document.

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La variabilité est une propriété intrinsèque aux systèmes biologiques, essentielle pour l'évolution et l'embryogénèse. Souvent considérée comme du bruit, ce n'est que récemment que l'aléatoire des processus biologiques a commencé à être systématiquement étudié. Cette thèse pose les questions suivantes : qu'est-ce qu'un développement normal ? Quel est l'étendue et le rôle de la variabilité dans la robustesse et la résilience du développement embryonnaire ?Ces questions sont posées pour le lapin (Oryctolagus cuniculus) et l'oursin (Paracentrotus lividus et Sphaerechinus granularis).Nous nous som

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Vanderklift, Mathew Arie. "Interactions between sea urchins and macroalgae in south-western Australia : testing general predictions in a local context." University of Western Australia. School of Plant Biology, 2002. http://theses.library.uwa.edu.au/adt-WU2004.0086.

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Generalist herbivores profoundly influence the biomass and species composition of macroalgae assemblages. In subtidal ecosystems of temperate latitudes, large invertebrates are usually the most influential herbivores. I tested the prediction that exclusion of invertebrate herbivores would lead to changes in the biomass and species composition of the macroalgae assemblages that are a prominent feature of the reefs in south-western Australia. The most abundant invertebrate herbivores were sea urchins (Heliocidaris erythrogramma, Phyllacanthus irregularis and Centrostephanus tenuispinus), and the

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41

Hereu, Fina Bernat. "Role of trophic interactions between fishes, sea urchins and algae in the northwestern Mediterranean rocky infralittoral, The." Doctoral thesis, Universitat de Barcelona, 2007. http://hdl.handle.net/10803/1443.

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The discipline of ecology is habitually divided up into a whole range of different specialities, and this thesis forms part of what is commonly known as "community ecology" (Diamond and Case 1986). To be more precise, my work has centred on the degree to which the trophic relationships that exist between the organisms constituting a food web govern the structure and dynamics of the communities they form. I approached the subject from an experimental point of view and all the work was carried out in the field by means of what are referred to as "natural experiments", with all the advantages and

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42

Soars, Natalie Anne. "Habitat soundscapes and sound production by tropical and temperate sea urchins and the swimming behaviour of their larvae." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13923.

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The distribution, abundance and behaviour of soniferous organisms influence the spatial variability of underwater noise characteristics or ‘soundscape’. In this way, the soundscape provides useful information on habitat and assemblages that enables navigation in larvae and can be used for environmental assessment and monitoring. Despite the ecological importance of sea urchins and evidence they produce sound of their sound, knowledge gaps remain regarding the role of adult and larval sea urchins in acoustic ecology. In this thesis the sounds produced by 3 temperate and 3 tropical species of se

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43

Poorbagher, Hadi, and n/a. "Life-history ecology of two New Zealand echinoderms with planktotrophic larvae." University of Otago. Department of Marine Science, 2008. http://adt.otago.ac.nz./public/adt-NZDU20081029.160011.

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The importance of parental nutritional status on planktotrophic larvae was investigated in both laboratory-conditioned and field (populations) parents of two New Zealand echinoderms: the sea urchin Pseudechinus huttoni and the starfish Sclerasterias mollis. Three questions were addressed: (i) Does parental nutritional status affect the reproductive features (gonad index, gametogenesis, fecundity and biochemical composition) both in the laboratory and under natural conditions? (ii) Does parental nutritional status affect egg characteristics (diameter, number, dry weight, fertilization rate an

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44

Mörk, Erik. "Macroalgal community dynamics on coral reefs : Implications for management." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-48281.

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Although rather inconspicuous on healthy coral reefs, macroalgae form the basis of coral food webs. Today, macroalgae are generally increasing and many reefs undergo transitions from coral to macroalgal dominance resulting from e.g. enhanced nutrient loading or increased fishing. This thesis aims to investigate the relative importance of top-down and bottom-up regulation, and different herbivore types, on macroalgal distribution, fecundity and community composition on coral reefs. Papers I and II indicate that macroalgal abundance in a coral reef system is largely governed by top-down regulati

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45

Day, Elizabeth. "Ecological interactions between abalone (Haliotis midae) juveniles and sea urchins (Parechinus angulosus), off the south-west coast of South Africa." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/9690.

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Bibliography: 172-183.<br>Field surveys were carried out in the kelp beds of the shallow subtidal off the south western Cape of South Africa, which confirmed the existence of a strong positive relationship between the urchins Parechinus angulosus and juveniles of the abalone Haliotis midae. Both species occupied primarily hard substrates, showing preferences for encrusting corallines. Of the juvenile abalone sampled, > 98% were found beneath sea urchins. All small (3-10 mm shell length) and medium sized (11-20 mm shell length) abalone juveniles occurred under urchins, whether on flat or vertic

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46

Farina, Simone. "Scale-dependent factors modulate sea urchin predation in macrophyte communities." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/325691.

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Many nearshore temperate coastal ecosystems are strongly regulated by top-down control. This is particularly true of shallow macrophyte communities, where habitat structuring is heavily dependent on the ability of predators to control populations of herbivorous sea urchins. Released from predation pressure, urchins can quickly transform macroalgal ecosystems to unproductive barrens. While temperate seagrasses are less dramatically affected, top-down processes still play critical roles in mediating trophic interactions and habitat structure. There has been considerable attention paid to un

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47

Schäfer, Sabine [Verfasser]. "Reproductive disorders in sea urchins (Psammechinus miliaris) caused by environmental pollutants / Sabine Schäfer. Alfred Wegener Institute for Polar and Marine Research." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2010. http://d-nb.info/1034994751/34.

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Rendina, Francesco. "Effects of acute temperature increase on performance and survival of Caribbean echinoids." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10050/.

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Climate change is occurring at a faster rate than in the past, with an expected increase of mean sea surface temperatures up to 4.8°C by the end of this century. The actual capabilities of marine invertebrates to adapt to these rapid changes has still to be understood. Adult echinoids play a crucial role in the tropical ecosystems where they live. Despite their role, few studies about the effect of temperature increase on their viability have been reported in literature. This thesis work reports a first systematic study on several Caribbean echinoids about their tolerance to temperature rise i

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Stumpp, Meike [Verfasser]. "Mechanismen der CO2-Toleranz bei Seeigeln des Genus Strongylocentrotus = Mechanisms of CO2 tolerance in sea urchins of the genus Strongylocentrotus / Meike Stumpp." Kiel : Universitätsbibliothek Kiel, 2011. http://d-nb.info/1020200804/34.

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Cavalcanti, Augusto Muniz. "Dieta do ouri?o-branco, Tripneustes ventricosus (Lamarck, 1816), no Arquip?lago de Fernando de Noronha, PE." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12473.

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Made available in DSpace on 2014-12-17T14:01:57Z (GMT). No. of bitstreams: 1 AugustoMC.pdf: 592613 bytes, checksum: 225d64aaa5fdd2313487f3c6c109454b (MD5) Previous issue date: 2007-12-07<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Sea urchins are benthic macroinvertebrates that inhabit shallow coastal waters in tropical and temperate zones. Urchins are usually classified as generalists or omnivores as they can adjust their diet according to the food resources available in the environment. Due to the strong grazing pressure they may exert, urchins have an important rol

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