Lagoons And Estuaries
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Lagoons And Estuaries
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Author : Sriyanie Miththapala
language : en
Publisher: IUCN
Release Date : 2013-01-01
Lagoons And Estuaries written by Sriyanie Miththapala and has been published by IUCN this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-01-01 with Nature categories.
Coastal lagoons and estuaries, lying at the boundary between ocean and land, house a unique mosaic of habitats, giving rise to high species diversity and the creation of ecotones. They are also ecologically and economically important ecosystems that provide many ecosystem services. Yet, these coastal ecosystems are facing a gamut of human-induced threats. This booklet is the fourth in the Coastal Ecosystems Series, published in an attempt to address the lack of information available to the general public regarding the threats to coastal ecosystems.
Eutrophic Shallow Estuaries And Lagoons
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Author : Arthur J. McComb
language : en
Publisher: CRC Press
Release Date : 1995-03-22
Eutrophic Shallow Estuaries And Lagoons written by Arthur J. McComb and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-03-22 with Science categories.
This book brings together, for the first time, a series of experts in various aspects of the eutrophication of shallow estuaries. It provides a comprehensive picture of our current state of knowledge of these systems. The first half of the book contains case studies from Asia, Australia, Europe, and South Africa and covers both temperate and tropical waters. The second half contains chapters on water exchange, the role of the sediments, the response of both plants and fisheries to eutrophication, and the economic issues considered in management. Using a broad multidisciplinary approach, discussions go beyond the hows and whys of eutrophication to demonstrate how effective management can be and has been carried out. Management of any ecosystem is only as good as the level of understanding on which it is based, and this book has relevance to estuarine ecologists and environmental managers alike.
Coastal Lagoons
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Author : R. S. K. Barnes
language : en
Publisher: Cambridge University Press
Release Date : 1980-11-13
Coastal Lagoons written by R. S. K. Barnes and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980-11-13 with Nature categories.
This book reviews the origin, development, morphology, environment and ecology of the world's coastal lagoons. There are particularly extensive series of lagoons - areas of salt or brackish water separated from the adjacent sea by a low-lying sand or shingle barrier - along the eastern and Gulf of Mexico coasts of the USA, in Mexico itself, in Brazil, West Africa, Natal, southern and eastern India, south-west and south-east Australia, Alaska, Siberia and around the shores of the Mediterranean, southern Baltic, Black and Caspian Seas. In several of these areas they support important fisheries. This book summarises what is known of the formation and fate of lagoons, the lagoonal environment, lagoonal ecology, the strategies of lagoonal species, the human use of lagoons, besides containing a general introduction and a section on methods for the study of coastal lagoons.
Fishes In Lagoons And Estuaries In The Mediterranean 1
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Author : Mohamed Hichem Kara
language : en
Publisher: John Wiley & Sons
Release Date : 2019-02-06
Fishes In Lagoons And Estuaries In The Mediterranean 1 written by Mohamed Hichem Kara and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-06 with Nature categories.
Lagoons and estuaries are transition spaces between earth and sea. Beyond their expanse, geographic repartition, geomorphological, hydroclimatic and ecobiological diversity and biodiversity, they play an important role in regional economies and are some of the ecosystems most vulnerable to global change. Reinforced by numerous references, this book studies Mediterranean lagoonal and estuarine fishes whose diversity largely depends on the composition of neighboring marine and continental ichtyofauna. The authors describe their morphological, biological, ecological and behavioral characteristics by evoking their distinctive features and differences with their marine or freshwater homologues. Their adaptation strategies, elucidated thanks to recent advances in morphology, genetics and molecular biology, are recognized as a major advantage in the context of climate change. This book is for natural environment managers, engineers, teachers, students and researchers.
Coastal Lagoon Processes
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Author : B. Kjerfve
language : en
Publisher: Elsevier
Release Date : 1994-05-20
Coastal Lagoon Processes written by B. Kjerfve and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-05-20 with Technology & Engineering categories.
This is a broad-based review of the environmental, oceanographic, engineering, and management aspects of coastal lagoons summarized in a convenient single volume. A comprehensive literature review, as well as references add to the utility of this volume, creating an invaluable resource for academics, scientists, and laymen.
Coastal Lagoons
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Author : Pierre Lasserre
language : en
Publisher:
Release Date : 1982
Coastal Lagoons written by Pierre Lasserre and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Coastal ecology categories.
Lagoons Of Sri Lanka
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Author : Silva, E. I. L.
language : en
Publisher: IWMI
Release Date : 2013-03-01
Lagoons Of Sri Lanka written by Silva, E. I. L. and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-01 with Nature categories.
Sri Lanka, an island in the Indian Ocean, has lagoons along 1,338 km of its coastline. They experience low-energy oceanic waves and semidiurnal microtidal currents. The Sri Lankan coastal lagoons are not numerous but they are diverse in size, shape, configuration, ecohydrology, and ecosystem values and services. The heterogeneous nature, in general, and specific complexities, to a certain extent, exhibited by coastal lagoons in Sri Lanka are fundamentally determined by coastal and adjoining hinterland geomorphology, tidal fluxes and fluvial inputs, monsoonal-driven climate and weather, morphoedaphic attributes, and cohesive interactions with human interventions.Most coastal lagoons in Sri Lanka are an outcome of mid-Holocene marine transgression and subsequent barrier formation and spit development enclosing the water body between the land and the sea. This process has varied from one coastal stretch to another due to wave-derived littoral drift, sediment transport by tidal fluxes, fluvial inputs and wave action or, in other words, sea-level history, shore-face dynamics and tidal range as the three major factors that control the origin and maintenance of the sandy barrier, the most important features for the formation and evolution of coastal lagoons with their landward water mass. In certain stretches of Sri Lanka’s coastline, formation of the barrier spit was very active due to shore-face dynamics that resulted in chains of shore parallel, elongated lagoons. They are among the most productive in terms of ecosystem yield and show some similarities to large tropical lagoons with respect to sea entrance, zonation, biodiversity and ecosystem services. However, some of them become seasonally hypersaline due to lack of freshwater input and high evaporation. Functions and processes of some of these water bodies are fairly known. There are a fair number of small back-barrier lagoons of different shapes and sizes whose origin goes back to sea-level history. They are located on low-energy coasts with prominent beach ridges and restricted hinterland geomorphology. Mixing processes of these landward indentations are hindered by elevated sand dunes, and their salinity increases due to poor freshwater input and high evaporation leading to seasonally hypersaline conditions. These sedimented lagoons, primarily confined to the southeastern coast of the island, are biologically the least productive, with limited ecosystem values and services. Another group of moderately elongated semicircular, slightly large lagoons in the same coast, formed exclusively by submergence due to mid-Holocene sea-level rises, do not receive sufficient freshwater input leading to seasonally hypersaline conditions. They are also biologically unproductive but some are ecologically important since they provide habitats conducive to migratory birds. In contrast, some lagoons on the southern coast receive sufficient freshwater via streams draining the wet zone, maintain more estuarine salinities, exhibit rich biodiversity and serve as functional resource units. Lagoons formed by mid-Holocene submergence and recession of water level with simultaneous chain barrier formation on the high energy southwest coast, which includes cliffs, small bays and headlands, show peculiar configurations and link channel characteristics. Some of these irregular water bodies have clusters of small isles and luxuriant mangrove swamps with high biodiversity but not very rich in catadromous finfish and shellfish species due to the restricted nature of the entrance channel and nondistinct salinity gradients. The barrier-built, seasonally hypersaline lagoon complex in the Jaffna Peninsula, the largest lagoon system in the country with multiple perennial entrances show extremely narrow salinity ranges towards the upper limit of salinity. The main lagoon is elongated and the shore parallel to eastward and southward extensions is connected by narrow channels. The other lagoon in the Jaffna Peninsula is elongated, shore parallel and ribbon-shaped and receives tidal water throughout the year but freshwater is received only from precipitation and surface runoff. Even though the lagoons in the peninsula are extremely rich in ecosystem heterogeneity their hydrology and hydrodynamics have been severely disturbed by infrastructural development for transportation and by attempts to create a freshwater river for Jaffna. There are a few virgin lagoons of moderate size also on the northern coast, south of the Jaffna Peninsula on both the east and west sides. They look very typical tropical lagoons rich in biodiversity and biological production but their structure, functions and values are virtually unknown in scientific or socioeconomic terms. The lagoons located on the east coast are not numerous but relatively large in extent. They are also an outcome not only of mid-Holocene sea-level rises but of submerged multi-delta valleys or abandoned paleo estuaries. When inundated, the multi-delta valley configuration became elongated and is shore parallel with a smooth seaward shoreline; both shorelines become irregular when coastal waves are weak, and internal waves are created by the action of local winds. Configuration of a lagoon formed by inundation of an abandoned river valley is irregular with a long entrance channel extended landward. These lagoons are highly productive with a variety of associated ecosystems, large open water areas and wide perennial sea entrances. When the lagoon is too much elongated, zonation is prominent due to fewer entrance effects. Lagoons form a particular type of natural capital which generates use values (fish, shrimp, fuelwood, salt, fodder, ecotourism, anchorage, recreation, etc.) and nonuse values (habitat preservation, biodiversity, ecosystem linkages, etc.) contributing positively towards improving the human well-being. Of many values of lagoons in Sri Lanka, only the extractive values are generally utilized at present, by way of fish and shrimp catches, salt production and use of mangrove for various purposes. Besides, coastal lagoons generate a range of nonextractive use values and nonuse values, which could add towards the total economic value. Misuse has taken place at several instances when “use” adversely affects the status of the resources or the health of the ecosystem due to vulnerability and poverty, population pressure, urbanization, development activities and multi-stakeholder issues. The status of lagoon resources shows that the resources in the majority of Sri Lankan lagoons still remain satisfactory, somewhat good or very good. Nevertheless, concerns for management of lagoons in Sri Lanka exist only where “use values” (extractive values, such as fish and shrimp) exist. There is no evidence of resources management in lagoons for inspirational, scholarly values or tacit knowledge of the same. Management for use values exhibits several stages from zero management to comanagement via community management and state intervention. Most of Sri Lanka’s lagoons have the potential for generating high extractive and nonextractive use values which could improve the human well-being, while maintaining resources sustainability. Unfortunately, these potentials have not been understood or “seen” yet by the relevant authorities, although a few instances of exploring this potential were noticed.
Coastal Lagoons
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Author : Michael J. Kennish
language : en
Publisher: CRC Press
Release Date : 2010-06-15
Coastal Lagoons written by Michael J. Kennish and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-06-15 with Computers categories.
Dynamic and productive ecosystems, coastal lagoons play an important role in local economies and often bear the brunt of coastal development, agricultural, and urban waste, overuse from fisheries, aquaculture, transportation, energy production, and other human activities. The features that make coastal lagoons vital ecosystems underline the importance of sound management strategies for long-term environmental and resource sustainability. Written by an internationally renowned group of contributors, Coastal Lagoons: Critical Habitats of Environmental Change examines the function and structure of coastal lagoonal ecosystems and the natural and anthropogenic drivers of change that affect them. The contributors examine the susceptibility of coastal lagoons to eutrophication, the indicators of eutrophic conditions, the influences of natural factors such as major storms, droughts and other climate effects, and the resulting biotic and ecosystem impairments that have developed worldwide. They provide detailed descriptions of the physical-chemical and biotic characteristics of diverse coastal lagoonal ecosystems, and address the environmental factors, forcing features, and stressors affecting hydrologic, biogeochemical, and trophic properties of these important water bodies. They also discuss the innovative tools and approaches used for assessing ecological change in the context of anthropogenically- and climatically-mediated factors. The book investigates the biogeochemical and ecological responses to nutrient enrichment and other pollutants in lagoonal estuaries and compares them to those in other estuarine types. With editors among the most noted international scholars in coastal ecology and contributors who are world-class in their fields, the chapters in this volume represent a wide array of studies on natural and anthropogenic drivers of change in coastal lagoons located in different regions of the world. Although a significant number of journal articles on the subject can be found in the literature, this book provides a single-source reference for coastal lagoons within the arena of the global environment.
Fishes In Lagoons And Estuaries In The Mediterranean 3a
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Author : Mohamed Hichem Kara
language : en
Publisher: John Wiley & Sons
Release Date : 2019-05-21
Fishes In Lagoons And Estuaries In The Mediterranean 3a written by Mohamed Hichem Kara and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-21 with Nature categories.
Based on the most recent scientific data, and without neglecting historical publications, Fishes in Lagoons and Estuaries in the Mediterranean 3 comprehensively details Mediterranean lagoonal–marine migratory fish. It provides information regarding their systematics, eobiology, ethology, genetics and their exploitation. After a general categorization of the species represented, this volume, third in a set of books on Mediterranean ichthyofauna, offers a synthesis of the knowledge acquired from 1890 to the present day for each of the 21 species most frequently found in Mediterranean lagoons and estuaries. These species are detailed across the two parts of volume 3. The scientific data presented in this book concern the species’ lagoon life as much as their marine life, and are therefore of particular interest for both the management of fish stocks and for the conservation of species. Designed to give rapid and comprehensive access to the body of knowledge on Mediterranean lagoonal and estuarine migratory fishes, this volume is for anyone involved in the use, management or protection of natural environments and their populations, including ecobiologists, geographers, engineers, teachers, students and researchers.
Some Considerations For The Management Of Coastal Lagoon And Estuarine Fisheries
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Author : James M. Kapetsky
language : en
Publisher: Food & Agriculture Org.
Release Date : 1981
Some Considerations For The Management Of Coastal Lagoon And Estuarine Fisheries written by James M. Kapetsky and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Education categories.
Management of artisanal fisheries in coastal lagoons and estuaries is treated in three broad categories -- regulatory management, non-regulatory management, and interactions between fisheries or fishery interests. Regulation of artisanal fisheries in coastal lagoons and estuaries by government authority is hampered for several reasons. Technical and financial constraints on government severely limit enforcement capabilities. Socio-economic considerations, chiefly the lack of alternative employment opportunities for fishermen, preclude the adoption of many of the classical regulatory management techniques. As a means to complement or supplement management by central government authority, revitalization of local traditional authority is advocated. Non-regulatory management, the application of methods which increase capture and culture fishery potential through manipulation of the environment, is illustrated by various kinds of hydraulic engineering, predator control, stocking, artificial nursery areas, and brush-park fisheries. Interactions between fisheries or fishery interests is treated at several levels. Considered are competition between groups of fishermen of different ethnic and economic backgrounds, interactions between artisanal capture fisheries and aquaculture, and competition between artisanal fisheries of coastal lagoons and estuaries and off-shore shore industrial fisheries which fish the same stocks.