Download or read book Eelgrass macroalgae Interactions written by Margot Hessing-Lewis and published by . This book was released on 2011 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the context-dependency of species interactions between seagrass and macroalgae in upwelling-influenced estuaries. In all coastal systems, nutrient loading is multidirectional, resulting from mostly freshwater and marine inputs. The directionality of nutrient inputs may affect the rate of supply of organic matter to the system. In systems where freshwater nutrient loading dominates, and has increased through time, research shows that blooms of fast-growing macroalgae often result in loss of critical seagrass habitats. In upwelling-influenced systems, marine- based nutrient inputs dominate during the summer, also resulting in blooms of ulvoid macroalgae during these productive months. The dominance of marine nutrients in these estuaries, coupled with additional variation in the physicochemical characteristics of seagrass beds, present novel contexts to study the outcomes of species interactions between the seagrass (Zostera marina L. (eelgrass) and ulvoid macroalgae. I studied these interactions at two different spatial scales that both address the relative importance of marine versus terrestrial nutrient sources on interaction outcome. Regionally, I studied between-estuary, latitudinal patterns in species interactions relative to differences in marine and terrestrial drivers of nutrient loading. Within an estuary, I also compared interactions among zones along an estuarine gradient, where nutrient patterns were reflective of the relative contribution of marine- based nutrients. At both scales of inquiry I employed both observational and experimental approaches to quantify species interaction dynamics. At the regional scale, I used a 5- year observational dataset from four estuaries along the Oregon and Washington coasts to study the relationship between eelgrass and ulvoid macroalgae (Chapter 2). Across latitudes that span ~220 km, macroalgal production was highest in the southern estuaries, and associated with decreased eelgrass production compared to the northern estuaries. However, through time, no estuarine site, regardless of its macroalgal biomass, was associated with declining eelgrass biomass. Contrary to systems where macroalgal production is driven by terrestrial inputs, I found that blooms in upwelling- influenced systems were associated with both marine and terrestrial drivers of nutrient inputs and production. In Coos Bay (South Slough), at the within-estuary scale, I also found differences in macroalgal and eelgrass biomass among sites along an estuarine gradient. Here too, based on a 2-year seasonal dataset of producer dynamics, I found no temporal relationship between eelgrass and macroalgae producer dynamics (Chapter 3). I used a comparative-experimental framework to understand the impact of macroalgal manipulations (additions and removals) on interactions with eelgrass along this gradient. In intertidal seagrass beds in the marine and polyhaline zones of the estuary I found that interaction strength was neutral and sometimes positive. However, in the riverine zone, interaction strength was negative, caused by decreased eelgrass density following macroalgal manipulation. To further examine the mechanisms informing interaction outcomes in the marine zone, a large-scale macroalgal manipulation was conducted, coupled with a mesocosm experiment (Chapter 4). For the mesocosm experiment I manipulated macroalgae and nutrients as in the field, but found dissimilar results. In the mesocosms, where water movement was limited and no tidal action occurred, negative effects of macroalgal addition were found. These were associated with increased light attenuation and decreased sediment oxygen levels. Contrary to these results, I found no macroalgal, or covariate effects in the field experiment. I also manipulated water column nutrients in both experiments, and found limited effects of nutrient enrichment on eelgrass, but not macroalgae, in the mesocosm experiment. Throughout these studies I demonstrated that the mechanisms determining context-dependency in upwelling-influenced estuaries are informed by physical and biogeochemical conditions, coupled with high ambient marine-derived nutrient concentrations. These findings are important to coastal management because they suggest that the strength, direction and mechanisms of interactions are shaped by local abiotic conditions and long-term nutrient regimes, rather than high nutrient concentrations per se. Given the shifting nature of nutrient concentrations in coastal waters associated with both coastal development and climate change, knowledge of context dependency can also be used to assess and forecast future changes in species interactions.
Download or read book Interactions Between Macro and Microorganisms in Marine Sediments written by and published by American Geophysical Union. This book was released on 2005-01-14 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine sediments support complex interactions between macro-and microorganisms that have global implications for carbon and nutrient cycles. What is the state of the science on such interactions from coastal and estuarine environments to the deep sea? How does such knowledge effect environmental management? And what does future research hold in store for scientists, engineers, resource managers, and educators?Interactions between Macro- and Microorganisms in Marine Sediments responds to these questions, and more, by focusing on:? Interactions between plants, microorganisms, and marine sediment? Interactions between animals, microorganisms, and marine sediment? Interactions between macro- and microorganisms and the structuring of benthic communities? Impact of macrobenthic activity on microbially-mediated geochemical cycles in sediments? Conceptual and numeric models of diagenesis that incorporate interactions between macro- and microorganismsHere is an authoritative overview of the research, experimentation and modeling approaches now in use in our rapidly evolving understanding of life in marine sediments.
Download or read book Eelgrass Macroalgae Habitat Interim Survey Guidelines written by and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harmful Algal Blooms written by Sandra E. Shumway and published by John Wiley & Sons. This book was released on 2018-05-17 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harmful Algal Blooms: A Compendium Desk Reference erläutert die Grundlagen der schädlichen Algenblüte (HAB) und bietet die notwendigen technischen Informationen, wenn es um unerwartete oder unbekannte schädliche Ereignisse in Zusammenhang mit Algen geht. Dieses Fachbuch behandelt die Gründe für die schädliche Algenblüte, erfolgreiche Management- und Monitoring-Programme, Kontroll-, Präventions- und Minderungsstrategien, die wirtschaftlichen Folgen, Gesundheitsrisiken sowie die Folgen für die Nahrungskette und Ökosysteme. Darüber hinaus bietet es ausführliche Informationen zu den häufigsten HAB-Arten. Harmful Algal Blooms: A Compendium Desk Reference ist ein unschätzbares Referenzwerk für Manager, Einsteiger in das Fachgebiet, Praktiker mit eingeschränkten Zugang zu wissenschaftlicher Literatur und alle, die schnell Zugriff auf Informationen benötigen, insbesondere vor dem Hintergrund neuartiger oder unerwarteter HAB-Ereignisse. Die drei Herausgeber gehören zu den weltweit führenden Forschern auf dem Fachgebiet. Führende Experten haben ebenfalls zu diesem Fachbuch beigetragen, das sich zu einem wichtigen Referenzwerk des Fachgebiets entwickeln wird, zumal das Thema immer mehr an Bedeutung gewinnt.
Download or read book Dynamics and Interactions of Epiphytic Macroalgae and Meifauna on the Seagrass Thalassia Testudinum written by Margaret Orin Hall and published by . This book was released on 1988 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Consequences of global change in coastal ecosystems from a multidisciplinary perspective written by Rodolfo Silva and published by Frontiers Media SA. This book was released on 2023-02-13 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Macrophytes as Foundation Species written by Emil Olafsson and published by CRC Press. This book was released on 2016-11-25 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine macrophytes (macroalgae, seagrasses, and mangroves) comprise thousands of species distributed in shallow water areas along the world’s coastlines. They play a key role in marine ecosystems regarding biodiversity and energy flow. A large proportion of macrophyte species can be characterised as ecosystem engineers—organisms that directly or indirectly affect the availability of resources to other species by modifying, maintaining, and creating habitats. This book is divided into three main themes: • Marine macroalgae and seagrasses as sources of biodiversity gives an overview of the diversity of the main organisms associated with macrophytes, and their functional role and interactions within their hosts. • Primary and secondary production of Macrophytes synthesizes research on food web structures derived from/or associated with, macrophytes and the transfer of macrophytic primary and secondary production from one ecosystem to another. • Threats to macrophytic ecosystem engineers addresses human-induced effects including eutrophication, physical destruction, invasive species, and global warming. The book is among the first one to concentrate on the value of macrophytes for the well-being of marine habitats. The book is aimed at academics but may be useful for students, policy makers, and laymen alike.
Download or read book Oceanography and Marine Biology written by Alan Ansell and published by CRC Press. This book was released on 1998-10-09 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oceanography and Marine Biology: an Annual Review considers basic areas of marine research, returning to them when appropriate in future volumes, and deals with subjects of special and topical importance in the field of marine biology. The thirty-sixth volume follows closely the objectives and style of the earlier well recieved volumes, conti
Download or read book The Causes and Consequences of Macroalgal Blooms on an Eelgrass Zostera Marina Community in Bodega Harbor CA written by Suzanne Victoria Olyarnik and published by . This book was released on 2008 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seagrasses of Australia written by Anthony W. D. Larkum and published by Springer. This book was released on 2018-07-27 with total page 791 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book takes the place of “Biology of Seagrasses: A Treatise on the Biology of Seagrasses with Special Reference to the Australian Region”, co-edited by A.W.D. Larkum, A.J. MaCComb and S.A. Shepherd and published by Elsevier in 1989. The first book has been influential, but it is now 25 years since it was published and seagrass studies have progressed and developed considerably since then. The design of the current book follows in the steps of the first book. There are chapters on taxonomy, floral biology, biogeography and regional studies. The regional studies emphasize the importance of Australia having over half of the world’s 62 species, including some ten species published for Australia since the previous book. There are a number of chapters on ecology and biogeography; fish biology and fisheries and dugong biology are prominent chapters. Physiological aspects again play an important part, including new knowledge on the role of hydrogen sulphide in sediments and on photosynthetic processes. Climate change, pollution and environmental degradation this time gain an even more important part of the book. Decline of seagrasses around Australia are also discussed in detail in several chapters. Since the first book was published two new areas have received special attention: blue carbon and genomic studies. Seagrasses are now known to be a very important player in the formation of blue carbon, i.e. carbon that has a long turnover time in soils and sediments. Alongside salt marshes and mangroves, seagrasses are now recognized as playing a very important role in the formation of blue carbon. And because Australia has such an abundance and variety of seagrasses, their role in blue carbon production and turnover is of great importance. The first whole genomes of seagrasses are now available and Australia has played an important role here. It appears that seagrasses have several different suites of genes as compared with other (land) plants and even in comparison with freshwater hydrophytes. This difference is leading to important molecular biological studies where the new knowledge will be important to the understanding and conservation of seagrass ecosystems in Australia. Thus by reason of its natural abundance of diverse seagrasses and a sophisticated seagrass research community in Australia it is possible to produce a book which will be attractive to marine biologists, coastal scientists and conservationists from many countries around the world.
Download or read book The Ecological Consequences of Genetic Diversity in Eelgrass Zostera Marina written by Anne Randall Hughes and published by . This book was released on 2006 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estuarine Nutrient Cycling The Influence of Primary Producers written by Søren Laurentius Nielsen and published by Springer Science & Business Media. This book was released on 2007-11-03 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is a well-known fact that eutrophication of coastal waters causes significant changes in the species composition of the primary producers. Usually a shift from an ecosystem dominated by sea grasses or large brown algae to an ecosystem dominated by fast-growing green algae or phytoplankton is observed. While this shift has been documented in a number of research papers and books, the consequences of this shift are less well known. This book focuses on the consequences of such changes for nutrient cycling. The aim is to investigate how different types of primary producers influence nutrient cycling in coastal marine waters, and how nutrient cycling changes qualitatively and quantitatively as a consequence of the changes in the primary producer community caused by eutrophication. The various chapters address specific ecological processes such as grazing, decomposition, burial and export of biomass from the ecosystem. The book is intended for researchers and professionals working in the field of coastal marine ecology and estuarine ecology and for advanced students in this field.
Download or read book Seagrasses Biology Ecology and Conservation written by Anthony W. D. Larkum and published by Springer Science & Business Media. This book was released on 2007-05-16 with total page 691 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seagrasses are unique plants; the only group of flowering plants to recolonise the sea. They occur on every continental margin, except Antarctica, and form ecosystems which have important roles in fisheries, fish nursery grounds, prawn fisheries, habitat diversity and sediment stabilisation. Over the last two decades there has been an explosion of research and information on all aspects of seagrass biology. However the compilation of all this work into one book has not been attempted previously. In this book experts in 26 areas of seagrass biology present their work in chapters which are state-of–the-art and designed to be useful to students and researchers alike. The book not only focuses on what has been discovered but what exciting areas are left to discover. The book is divided into sections on taxonomy, anatomy, reproduction, ecology, physiology, fisheries, management, conservation and landscape ecology. It is destined to become the chosen text on seagrasses for any marine biology course.
Download or read book Hydraulic and Environmental Modelling written by R.A. Falconer and published by Routledge. This book was released on 2019-11-12 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1992, this wide-ranging volume features 44 articles from 89 contributors on issues of and solutions to modelling of coastal waters around the world in response to an increasing interest in the development and application of numerical hydraulic models as design and management tools. The contributors advise on areas including tidal current modelling, water quality modelling, sediment transport modelling, wave kinematics and computational methods, along with two keynote articles. The main aim of the conference and its resulting volume was to provide a forum whereby engineers, scientists and planners involved in multi-disciplinary models could collaborate and share their expertise. The counterpart to this book is Hydraulic and Environmental Modelling: Estuarine and River Waters.
Download or read book The Ecology of Tidal Marshes of the Pacific Northwest Coast written by Denise M. Seliskar and published by . This book was released on 1983 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Global Seagrass Research Methods written by F.T. Short and published by Elsevier. This book was released on 2001-11-06 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thorough and informative volume presents a set of detailed, globally applicable techniques for seagrass research.The book provides methods for all aspects of seagrass science from basic plant collection to statistical approaches and investigations of plant-animal interaction. The emphasis is on methods that are applicable in both developing and developed countries. The importance of seagrasses in coastal and near shore environments, and ultimately their contribution to the productivity of the world's oceans, has become increasingly recognised over the last 40 years.Seagrasses provide food for sea turtles, nearly 100 fish species, waterfowl and for the marine mammals the manatee and dugong. Seagrasses also support complex food webs by virtue of their physical structure and primary production and are well known for their role as breeding grounds and nurseries for important crustacean, finfish and shell fish populations. Seagrasses are the basis of an important detrital food chain. The plants filter nutrients and contaminants from the water, stabilise sediments and act as dampeners to wave action. Seagrasses rank with coral reefs and mangroves as some of the world's most productive coastal habitat and strong linkages among these habitats make the loss of seagrasses a contributing factor in the degradation of the world's oceans.Contributors from around the world provide up-to-date methods for comparable collection of ecological information from both temperate and tropical seagrass ecosystems.
Download or read book Hydraulic and Environmental Modelling Estuarine and River Waters written by R.A. Falconer and published by Taylor & Francis. This book was released on 2019-07-23 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1992, this is the second of two volumes on recent advances in the field of hydraulic and environmental modelling, with invited and refereed contributions from an international group of engineers, scientists and planners involved in application, research and development. It covers the estuarine and river waters with parts devoted to: flow processes; flow modelling; salinity intrusion modelling; water quality modelling; sediment transport modelling; expert systems. The first volume covers coastal waters. With the continually increasing interest in the development and application of numerical hydraulic models, their value is especially evident as tools of design and management for flow, pollutant and sediment transport simulation studies in various environments. The readership includes practising engineers and scientists in the water industry, consulting engineers, water companies and the NRA and other government departments, university and polytechnic libraries, staff and students and all other members of the water engineering profession.
