Download or read book Population Genetics of the Green Sea Urchin Strongylocentrotus Droebachiensis microform written by Jason Andrew Addison and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetics of the Green Sea Urchin Strongylocentrotus Droebachiensis written by Jason Andrew Addison and published by . This book was released on 2004 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Edible Sea Urchins Biology and Ecology written by John M. Lawrence and published by Elsevier. This book was released on 2006-12-07 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sea urchins are a major component of the world ocean. They are important ecologically and often greatly affect marine communities. They have an excellent fossil record and consequently are of interest to paleontologists. Research has increased in recent years stimulated first by a recognition of their ecological importance and then because of their economic importance. Scientists around the world are actively investigating their potential for aquaculture. This book is designed to provide a broad understanding of the biology and ecology of sea urchins. Synthetic chapters consider biology of sea urchins as a whole to give a broad view. The topics of these chapters include reproduction, metabolism, endocrinology, larval ecology, growth, digestion, carotenoids, disease and nutrition. Subsequent chapters consider the ecology of individual species that are of major importance ecologically and economically. These include species from Japan, New Zealand, Australia, Europe, North America, South America and Africa. * First comprehensive book devoted to the biology and ecology of sea urchins * NEW chapter on Nutrition of Sea Urchins and Ecology of Diadema * Brand NEW illustrations * Hot NEW topic: Immunology of the Sea Urchin * Chapters written by internationally recognized experts * Each chapter revised and updated from the first edition * Biological chapters include reproduction, endocrinology, carotenoids and disease * Ecological chapters include species of major economic interest for fisheries and aquaculture
Download or read book Sea Urchins written by John M. Lawrence and published by Academic Press. This book was released on 2013-05-31 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fully revised and expanded edition of Sea Urchins provides a wide-ranging understanding of the biology and ecology of this key component of the world's oceans. Coverage includes reproduction, metabolism, endocrinology, larval ecology, growth, digestion, carotenoids, disease and nutrition. Other chapters consider the ecology of individual species that are of major importance ecologically and economically, including species from Japan, New Zealand, Australia, Europe, North America, South America and Africa. In addition, six new contributions in areas such as immunology, digestive systems and community ecology inform readers on key recent developments and insights from the literature.Sea urchins are ecologically important and often greatly affect marine communities. Because they have an excellent fossil record, they are also of interest to paleontologists. Research on sea urchins has increased in recent years, stimulated first by recognition of their ecological importance and subsequently their economic importance. Scientists around the world are actively investigating their potential for aquaculture and fisheries, and their value as model systems for investigations in developmental biology continues to increase. Continues the series "Developments in Aquaculture and Fisheries Science" with a newly revised volume Collects and synthesizes the state of knowledge of sea urchin biology and ecology Expanded from previous edition to include non-edible species, providing the needed basis for broader evolutionary understanding of sea urchins
Download or read book Pathogenic Impacts on the Green Sea Urchin Strongylocentrotus Droebachiensis in the Gulf of Maine written by Scott Raymond Randolph Haskell and published by . This book was released on 2008 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Dynamics and Spatial Analysis of the Maine Green Sea Urchin strongylocentrotus Droebachiensis Fishery written by Robert C. Grabowski and published by . This book was released on 2003 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Sea Urchin written by Paul de Bijl and published by CRC Press. This book was released on 2002-06-01 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume deals with various aspects of the biology and aquaculture of the sea urchin.
Download or read book Survey Results of Green Sea Urchin Strongylocentrotus Droebachiensis Populations in Haro Strait British Columbia March 2008 March and August 2009 and March 2010 written by B. J. Waddell and published by . This book was released on 2017 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report presents the results of the initial four surveys of a continuing series of Green Sea Urchin (Strongylocentrotus droebachiensis) surveys, undertaken jointly between Fisheries and Oceans Canada (DFO) and industry (West Coast Green Urchin Association - WCGUA) in Haro Strait, British Columbia, between March 2008 and March 2010. These surveys are complementary to a similar continuing series of Green Sea Urchin surveys conducted in Queen Charlotte Strait, originating in October 1995. Data were collected by SCUBA divers using the transect-quadrat method, and include information on size and abundance of Green Sea Urchins, gonad weight and quality, and on the depth and substrate. The long-term objectives are to assess variability in Green Sea Urchin populations over time to monitor harvest impacts"--Abstract, p. vii.
Download or read book Sea Urchin written by Maria Agnello and published by BoD – Books on Demand. This book was released on 2017-10-04 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is addressed to the readers operating in the sea urchin field of research, as well as to the lovers of this fascinating organism. Sea urchin, among the most known marine invertebrates belonging to the deuterostomes, is more closely related to humans than other invertebrates, thus representing a suitable model system not only for developmental biology and ecotoxicology but also for biomedicine. The topics described highlight the validity and versatility of this organism for different kinds of investigations. A collection of interesting chapters contributes to this volume and clearly shows the reason of the high interest manifested by a huge number of scientists around the world for this organism over time. Each contribution is a separate and comprehensive chapter but within the book's aim.
Download or read book Resilience of Green Sea Urchin strongylocentrotus Droebachiensis Populations Following Fishing Mortality Marine Protected Areas Alternate Stable States and Larval Ecology written by John Vavrinec III and published by . This book was released on 2003 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Approaches to Assessing Red Sea Urchin Strongylocentrotus Franciscanus Populations written by Patty Debenham and published by . This book was released on 1997 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Survey Results of Green Sea Urchin Strongylocentrotus Droebachiensis Populations in Queen Charlotte Strait British Columbia written by B. J. Waddell and published by . This book was released on 2005 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Individual and Population Level Responses to the Environment written by Kathleen Anne MacGregor and published by . This book was released on 2020 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Feeding and the search for food are one of the most important activities of all mobile animals, providing individuals with the energy and resources to grow and reproduce. Foraging is fundamentally concerned with movement through an explicit landscape. Marine environments present a set of unique opportunities and challenges for mobile foragers because water is much denser than air and exerts significant drag and lift forces on benthic organisms moving across the bottom. Substratum type, therefore, functions as a key determinant of movement in subtidal marine environments. Urchins (Phylum Echinodermata, Class Echinoidea) are one of the most important marine grazers worldwide. When urchin populations are large, they can overgraze brown macroalgal (kelp) beds and form urchin barren grounds, characterized by a complete lack of kelp and high densities of urchins. Under such conditions, the foraging of adult urchins largely determines the state of subtidal benthic habitats by limiting the recolonization of macroalgae. Urchins in barren grounds thus exist in a resource-limited state, and the rapid detection and consumption of resource patches, particularly pieces of macroalgae from adjacent algal beds, is therefore key in determining individual growth and reproduction. However, there are very few detailed examinations of urchin movement and none which explicitly take both seascape and the presence of food into account, making predictions about community responses to environmental changes difficult. My objective in this thesis was to evaluate the environmental factors modifying the movement behaviour of urchins in barren grounds, including the role of environment in determining the response of these communities to perturbations such as a fishery or disease outbreak which entail a reduction in urchin numbers and biomass. First, I combined a global literature review of previous experimental manipulations of urchin abundances with my own replicated urchin removal experiment in order to examine the causal link between grazing pressure exerted by urchins and macroalgal colonization and growth. In the published literature, urchin removals result in kelp colonization in only two thirds of cases worldwide. In my own manipulations in the Gulf of St. Lawrence, site was the most important determinant of successful reduction of urchin densities. Spatial variability, possibly related to the strength of indirect interactions such as competition between large and small urchins, was essential in determining the outcomes of perturbation experiments. In order to examine the movement behaviour that could explain the spatial variability in community response in detail, I then experimentally manipulated substrata composition in the field to examine the interacting effects of substrata and the presence of drift kelp on urchin movement behaviour. Unstable substrata (sand) did not function as absolute barriers to urchin movement in barren grounds, but urchin densities were lower on sand relative to adjacent rocky substrata, and sand barriers slowed cumulative consumption of drift kelp. Once again, however, there were clear and consistent site-to-site differences in movement behaviour, possibly related to the size-structure of urchin populations. Sand patches v appear to reduce movement of very large urchins (test diameter > 50 mm) but not of medium-sized urchins (test diameter of 20-50 mm). Finally, I used time-lapse photography to describe the movements of individual urchins in relation to the presence of kelp and differences in seascape substratum composition. Green sea urchins were able to detect the presence of drift kelp in barren ground habitats and alter their movement behaviour in response but did not move directly towards the kelp. Seascapes with increased proportions of rocky substrata facilitated increased urchin movement in response to the presence of drift, but only in the summer and not in spring. The intriguing relationships between movement behaviour and urchin size at specific sites combined with the observed seasonal variability indicate that the role of seascape in determining the movement behaviour of urchins is complex and modified by important intrinsic and extrinsic factors. My results are the first detailed observations of urchin movement in a spatially explicit context and clearly demonstrate that a mechanistic understanding of the responses of barren ground systems to future perturbations must include detailed information on environmental modification of behaviour.
Download or read book Spawning Inducers of the Green Sea Urchin Strongylocentrotus Droebachiensis written by Nicole Caron and published by . This book was released on 1999 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of Growout Strategies for the Green Sea Urchin Strongylocentrotus Droebachiensis in the Gulf of Maine written by Pamelia Elise Fraungruber and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental and Biological Drivers of Feeding and Spatial Dynamics in the Green Sea Urchin Strongylocentrotus Droebachiensis written by Desta Lynne Braden Frey and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In eastern Canada, the destruction of foundational kelp beds by dense aggregations (fronts) of the omnivorous green sea urchin, Strongylocentrotus droebachiensis, is a key determinant of the structure and dynamics of shallow reef communities. Current knowledge about factors affecting the ability of S. droebachiensis to exert top-down community control is based largely on observational studies of patterns in natural habitats, yielding fragmentary, and sometimes contradictory, results. The present research incorporated laboratory microcosm experiments and surveys of urchins in natural habitats to test the effects of abiotic (wave action, water temperature) and biotic (body size, population density) factors on: (1) individual and aggregative feeding on the winged kelp, Alaria esculenta; and (2) displacement, microhabitat use, distribution, and aggregation in food-depleted habitats. Wave action, water temperature, and body size strongly affected the ability of urchins to consume kelp: individual feeding increased with increasing body size and temperature, while aggregative feeding decreased with increasing wave action. Yet, feeding in large urchins dropped by two orders of magnitude between 12 and 18°C. Increasing wave action triggered shifts in urchin displacement, microhabitat use, distribution, and aggregation: urchins reduced displacement and abandoned flat surfaces in favour of crevices. They increasingly formed two-dimensional aggregations at densities ≥110 individuals m−2. Collectively, results provide a foundational understanding of some of the drivers of feeding and spatial dynamics of S. droebachiensis and potential impacts on the formation of grazing fronts.
Download or read book Growth and Reproduction in Kelp Bed and Barren Populations of Strongylocentrotus Droebachiensis Muller the Green Sea Urchin written by Stephen P. Truchon and published by . This book was released on 1988 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
