Download or read book The Ecological Role of Non geniculate Coralline Red Algae in Abalone Larval Settlement written by Sabine Maria Daume and published by . This book was released on 1998 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Settlement and Postlarval Ecology of the Red Abalone Haliotis Rufescens in Culture Systems written by and published by . This book was released on 1999 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies on abiotic and biotic factors that may influence metamorphosis induction and early postlarval survival and growth of the abalone Haliotis rufescens (Mollusca: Gastropoda) in culture systems were conducted. The availability of appropriate cues for metamorphosis induction is crucial. The conventional cue provided in abalone culture (diatom films) is inadequate for this species. This study shows, for the first time, that the gamma-aminobutyric acid (GABA) can be used successfully in massive-scale conditions. Metamorphosis induction by this amino acid was 75-76% (after 24 h) while only 8-12% larvae responded to diatom films. Bacterial interference can be minimized by exposing larvae to GABA in clean tanks and adding diatoms (and associated bacteria), as a postlarval food, after metamorphosis is induced. Alternatively, the conventional GABA concentration (1 micromolar) may be increased within safe limits (up to 2-3 micromolar) to cope with potential degradation of the amino acid by bacteria. Another important factor is the timing of settlement, since a suboptimal induction occurred in precompetent larvae or after a prolonged delayed metamorphosis. However, a maximum response to GABA and increased early postlarval development were observed for larvae settling 1-3 days after the onset of competence. Although GABA is now routinely used to improve settlement in many H. rufescens hatcheries, high mortality or slow postlarval growth are still common. Ecological conditions in the benthic boundary layers above diatom-films of culture systems may play an important role on postlarval fitness. Oxygen microgradients within 1 mm above biofilm surfaces were observed in laboratory studies, with bottom levels higher than 180% or lower than 50% saturation in light and dark conditions, respectively. Reduced postlarval survival and growth can also result from the depletion of biofilms after excessive grazing. Thus, information on grazing rates and the factors controlling them is crucial for the optimal management of culture systems. This contribution provides the first estimates of grazing rates of H. rufescens postlarvae, based on the digital analysis of video-recorded images, ranging from 20 to 724 diatom cells/individual/hour during the first month after settlement.
Download or read book Periphyton written by M. E. Azim and published by CABI. This book was released on 2005-11-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive monograph on periphyton, this book contains contributions by scientists fromaround the globe. Multi-disciplinary in nature, it covers both basic and applied aspects of periphyton,and is applicable worldwide in natural, extensive and intensive managed systems.Periphyton, as described in this book, refers to the entire complex of attached aquatic biota on submergedsubstrates, including associated non-attached organisms and detritus. Thus the periphyton communitycomprises bacteria, fungi, protozoa, algae, zooplankton and other invertebrates. Periphyton is importantfor various reasons: as a major contributor to carbon fixation and nutrient cycling in aquatic ecosystems;as an important source of food in aquatic systems; as an indicator of environmental change. It can alsobe managed to improve water quality in lakes and reservoirs; it can greatly increase aquaculture production;it can be used in waste water treatment.The book provides an international review of periphyton ecology, exploitation and management. Theecology part focuses on periphyton structure and function in natural systems. The exploitation part coversits nutritive qualities and utilization by organisms, particularly in aquaculture. The final part considersthe use of periphyton for increasing aquatic production and its effects on water quality and animal healthin culture systems. This book will help scientists and entrepreneurs further understand the ecology andproduction of aquatic systems and venture into new and promising areas.
Download or read book Workshop on Rebuilding Abalone Stocks in British Columbia written by Alan Campbell and published by NRC Research Press. This book was released on 2000 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international Workshop on Rebuilding Abalone Stocks in British Columbia was held during February 23-26 , 1999, in Nanaimo, British Columbia, Canada. The main goal of the workshop was to develop a realistic strategy to rehabilitate depleted northern (pinto) abalone, Haliotis kamtschatkana, stocks in British Columbia. The workshop was also meant to clarify the roles, expectations, and shared interests of many of the interest groups in British Columbia,emphasizing the key role in the rebuilding plan of local communities,including First Nations and non-native communities.
Download or read book Ecology of Australian Temperate Reefs written by Scoresby Shepherd and published by CSIRO PUBLISHING. This book was released on 2013-10-23 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the ecology of important elements of southern Australian sub-tidal reef flora and fauna, and the underlying ecological principles.
Download or read book The Biology and Ecology of Giant Kelp Forests written by David R. Schiel and published by Univ of California Press. This book was released on 2015-05-01 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: The largest seaweed, giant kelp (Macrocystis) is the fastest growing and most prolific of all plants found on earth. Growing from the seafloor and extending along the ocean surface in lush canopies, giant kelp provides an extensive vertical habitat in a largely two-dimensional seascape. It is the foundation for one of the most species-rich, productive, and widely distributed ecological communities in the world. Schiel and Foster’s scholarly review and synthesis take the reader from Darwin’s early observations to contemporary research, providing a historical perspective for the modern understanding of giant kelp evolution, biogeography, biology, and physiology. The authors furnish a comprehensive discussion of kelp species and forest ecology worldwide, with considerations of human uses and abuses, management and conservation, and the current and likely future impacts of global change. This volume promises to be the definitive treatise and reference on giant kelp and its forests for many years, and it will appeal to marine scientists and others who want a better appreciation and understanding of these wondrous forests of the sea.
Download or read book Coralline Algae Globally Distributed Ecosystem Engineers written by Laurie Carol Hofmann and published by Frontiers Media SA. This book was released on 2020-07-08 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Chemical Ecology written by James B. McClintock and published by CRC Press. This book was released on 2001-06-13 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interdisciplinary field of marine chemical ecology is an expanding and dynamic science. It is no surprise that the breadth of marine organisms studied expanded in concert with developments in underwater technology. With its up-to-date subject reviews by experts, Marine Chemical Ecology is the most current, comprehensive book on the subject. The
Download or read book Ecology Taxonomy and Microbiology of Crustose Coralline Algae and Their Role in Mediating Recruitment of Scleractinian Corals written by Aurora Giorgi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coral reefs are one of the most productive ecosystems on Earth. Despite their great importance, they are among the most fragile ecosystems and have been facing dramatic declines over recent decades. Thus, studies on the conditions necessary for the recruitment of coral larvae are warranted, as this has direct implications for the resilience and recovery of coral species worldwide. For many scleractinian coral species, larval recruitment is influenced by the presence of crustose coralline algae (CCA) and/or by the biofilm of microorganisms covering the surface of these algae. However, little is known about the ability of individual CCA species to mediate coral recruitment, largely due to knowledge gaps regarding the distribution, abundance, taxonomy, chemical ecology, and microbiology of CCA. This work provides information on the distribution and abundance of CCA in the western tropical North Atlantic through reefs surveys, addressed problems regarding their taxonomy through the implementation of an integrative taxonomic approach, and employed settlement experiments to investigate the chemical ecology, microbiology of CCA and the potential of individual species to mediate settlement and metamorphosis of scleractinian corals. Results from these studies demonstrated that CCA were present at low abundance on the reefs examined and that rare CCA species were more likely to induce higher settlement rates for planulae. This dissertation also provided evidence that morpho-anatomical studies were not sufficient to accurately estimate diversity within this group of algae and that the use of multiple molecular markers as well as sequences of type specimens were necessary. Analysis of the algal-associated prokaryotic communities revealed that CCA species hosted distinct bacterial assemblages on their surface and that the response of scleractinian larvae to CCA was species-specific, therefore broad inferences about the potential of CCA to induce coral settlement cannot be made. In conclusion, these results provide support for additional efforts to identify specific settlement requirements for individual scleractinian coral species, especially those species which are currently listed as threatened. Lastly, conservation efforts to preserve CCA should be implemented since they, like scleractinian corals, are impacted by chronic and acute anthropogenic disturbances and their presence is important for continued settlement of coral larvae.
Download or read book Encyclopedia of Tidepools and Rocky Shores written by Mark W. Denny and published by Univ of California Press. This book was released on 2007 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This is the book I have been waiting for! Written by experts in each field, this Encyclopedia provides a wealth of information not only about the tidepool and shore life but also the oceanography associated with these habitats. This will be a major reference guide for years to come."--Dr. Nigella Hillgarth, Executive Director, Birch Aquarium at Scripps, Scripps Institution of Oceanography "The "Encyclopedia of Tidepools and Rocky Shores" covers much more than one might guess. It ranges from oceanography, to physiology, biomechanics, and conservation science, along with the expected treatment of the diverse groups of organisms that live in those habitats. The coverage of each topic is kept short and comprehensible to almost everyone, from high schools to colleges, and certainly to the general public interested in learning more about this fascinating part of our natural world. Best of all, the editors have managed to get some of the best scientists in the world, the absolute experts in their fields, to write the articles. The relatively short length of each entry also makes this book an ideal source for assigned readings to accompany marine biology, ecology, or oceanography classes, laboratories and field trips. It will be much appreciated by teachers and students."--Ken Sebens, Director of the Friday Harbor Marine Laboratories, University of Washington "The place where vast oceans meet the land is wondrous, complex and fascinating. Visitors from research scientists to toddlers have explored these ecosystems--one of nature's most popular theme parks. Anyone who has spent time amongst the sea stars, crabs and kelp departs full of unanswered questions. Now these questions can beanswered by dipping into the "Encyclopedia of Tidepools and Rocky Shores," The editors and contributors to this reference have created a new standard that will be an immediate classic."--Leon Panetta, Director, The Leon & Sylvia Panetta Institute for Public Policy "This volume is a wonderful introduction to the hidden and fascinating world of rocky tidepools. Grab a copy and head out with your kids or students for an outdoor experience that's sure to get them hooked. From remarkable adaptations of marine algae to weird animal life histories, tidepools hold amazing stories to tell. They deserve our interest--and our care--as part of earth's natural systems that sustain us all."--Julie Packard, Executive Director, Monterey Bay Aquarium "Tide pool lovers the world around will satisfy their curiosity, uncover new gems of insight and renew their wonder of nature at lands' end in this authoritative, fascinating and insightful compilation. Revealed within are the secrets of rocky shores and tide pools--that most dynamic of interfaces between the land and the sea, that treasure chest of rich biodiversity and keen insight, that world where science, literature, beauty and stewardship combine to form the now that integrates the past and tempts the future."--Jane Lubchenco, Wayne and Gladys Valley Professor of Marine Biology, Oregon State University
Download or read book Journal of Shellfish Research written by and published by . This book was released on 2007 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probiotics written by Everlon Rigobelo and published by BoD – Books on Demand. This book was released on 2012-10-03 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few decades the prevalence of studies about probiotics strains has dramatically grown in most regions of the world. Probiotics are specific strains of microorganisms, which when served to human or animals in proper amount, have a beneficial effect, improving health or reducing risk of getting sick and the probiotics are used in production of functional foods and pharmaceutical products. This book provides the maximum of information approaching issues as probiotics in food, health, biotechnological aspects and the use of probiotics in aquaculture for all that need them trying with this to help many people at worldwide.
Download or read book Aquaculture of Emergent Marine Invertebrates Advances in Nutrition Rearing Technology and End Product Quality written by Sílvia Lourenço and published by Frontiers Media SA. This book was released on 2022-12-05 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sea level research a manual for the collection and evaluation of data written by O. van de Plassche and published by Springer. This book was released on 2013-12-20 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: An editorial by Wanless (1982), entitled "Sea level is rising - so what?", tells the case of an executive editor of a major city newspaper, who, when confronted with evi dence for a recent sea-level rise, replied: "That just means the ocean is six inches deeper, doesn't it?". Whether his "so what?" attitude was real or put on to dike a threat of sensation, there is at present a wide and deepening interest in ongoing and future global sea-level change. This interest has grown along with the concern over global warming due to increasing levels of C02 and trace gases. A stage has been reached where investigators of climat- sea-level relationships call for long-term measurement programmes for ice-volume changes (using satellite altimetry) and changes in temperature and salinity of the oceans (ther mal expansion). This manual, however, is primarily concerned with sea level changes in the past, mainly since the end of the last glaciation. Its major objective is to help answer the ques tion: "how?", which, of course, is little else but to assist in the gathering of fuel for the burning question: "why?" Good fuel, hopefully, for the less smoke and ashes, and the more heat and light produced by that fire, the better scientists are enabled to develop a quantitative under standing of past, and hence of future, sea-level changes on different spatial and temporal scales.
Download or read book Changes in Settlement Behavior of Haliotis Rufescens Larvae After Exposure to Acidified Conditions written by Molly Sueko Gleason and published by . This book was released on 2014 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean acidification (OA) could potentially alter the interaction between settling invertebrate larvae and the settlement cue-producing crustose coralline algae (CCA). We hypothesized this arises from the impairment of larval cue detection and/or physiological changes to CCA. We examined the interaction between the larvae of the commercially valuable red abalone (Haliotis rufescens) and its preferred settlement substrata, CCA species Lithothamnium californicum, under high pCO2 conditions created to mimic future OA scenarios. CCA were exposed to high pCO2 conditions (treatment pH 0.2 ± 0.05 units lower than ambient) for 6 weeks and larvae were exposed during early development. Physiological studies were first conducted to determine whether high pCO2 directly impacts CCA growth and larval survival. Three unique orthogonal larval settlement experiments were performed to determine if larval substrate preference was affected by : 1) larval exposure to high pCO2, 2) CCA exposure to high pCO2, or 3) both organisms' exposure to high pCO2. My results show that 1) CCA suffered a reduction in net calcification, 2) four out of five trials did not reveal an impact of high pCO2 on abalone larval survival, 3) CCA exposure to high pCO2 did not affect larval settlement to CCA, 4) larval exposure to high pCO2 reduced settlement to CCA and 5) both organisms exposure to high pCO2 did not affect settlement. Larval survival and settlement responses were variable after larval exposure to high pCO2. This may have been a result of the conditions adult abalone were raised, adult fitness and possibly genetic adaptation to OA.
Download or read book Marine Algae written by Leonel Pereira and published by CRC Press. This book was released on 2014-09-26 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is divided into three thematic areas. The first covers a revision of the taxonomy of algae, based on the algae portal, as well as the general aspects of biology and the methodologies used in this branch of marine biology. The second subject area focuses on the use of algae in environmental assessment, with an intensive implementation in Western economies and some emerging economies. The third topic is the potential use of algae in various industries including food, pharmaceuticals, cosmetics, agricultural fertilizers, and the emerging biofuels industries.
Download or read book Biology of the Red Algae written by Kathleen M. Cole and published by Cambridge University Press. This book was released on 1990-11-30 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: When Biology of the Red Algae was first published in 1990, it was the first comprehensive monograph to be written on the Rhodophyta in over fifteen years. This book presents an authoritative review on the state of knowledge on the biology of the red algae. Written by a group of 26 internationally renowned experts, the eighteen chapters of Biology of the Red Algae range from molecular and cellular to biochemical, physiological, organismal, and ecological aspects of this important group of algae. Together they will be of interest for students of oceanography and plant evolution.
