The Ecology, Genetics, and Conservation of Migratory Catfish (Pangasiidae) in the Mekong River PDF Download
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Author: Zeb Shelton Hogan
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
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Book Description
Author: Zeb Shelton Hogan
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
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Book Description
Author: Huong Thanh Hoang
Publisher:
ISBN:
Category : Genetic recombination
Languages : en
Pages : 142
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Book Description
The Mekong River located in Southeast Asia is a global "hotspot" for aquatic biodiversity. It includes an extensive variety of fish species second only to the Amazon River in South America. Recent studies have revealed the impacts of anthropogenic and climate factors on this river system. Such impacts can result in the formation of barriers, which divide a species population and impede gene flow between separated sub-populations. Barriers influence evolutionary trajectories resulting in the generation of geographic variants or subspecies from an ancestral population. Catfish (Teleostei: Siluriformes) are a key species of the Mekong River ecosystem and are an essential component of southeast Asian commercial fisheries. Using catfish as an indicator species for Mekong River ecosystem stability has proved challenging due to use of different genetic markers by different research groups and the unsuitability of some markers to resolve differences at distinct taxonomic levels. In this study, a subset of samples from a larger group of more than 800 fish specimens from 19 sampling sites in the Lower Mekong Basin were used to examine the suitability of the recombination activating gene 1 (rag1), a nuclear gene, for differentiating phylogenetic and biogeographic relationships. Specifically, 183 samples from four phenotypically identified Pangasiid species were used to compare marker fidelity between a mitochondrial gene (i.e., 16S rDNA) and rag1, which was previously reported to resolve interspecies differences. Phylogenies based on 16S rDNA were used to reveal species level relationships and to correct misclassifications based on phenotypic identification of fish species. Two of the four species - Pangasius macronema and Pangasianodon hypophthalmus - were further studied to determine if the rag1 gene can serve as a robust genetic marker for evaluating phylogeographic patterns. Discernable biogeographic trends for P. hypophthalmus were not resolved using rag1 as a marker. However, a phylogenetic cluster was resolved for P. macronema that mapped to geography suggesting that rag1 may be useful in resolving biogeographic structure for this species of catfish. If catfish are to be used as indicator species for river system stability, establishing reliable genetic markers for rapid analysis of biogeographic trends is essential.
Author: Ngo Xuan Tuyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 796
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Author: David Dudgeon
Publisher: Cambridge University Press
ISBN: 1108882625
Category : Nature
Languages : en
Pages : 517
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Book Description
Growing human populations and higher demands for water impose increasing impacts and stresses upon freshwater biodiversity. Their combined effects have made these animals more endangered than their terrestrial and marine counterparts. Overuse and contamination of water, overexploitation and overfishing, introduction of alien species, and alteration of natural flow regimes have led to a 'great thinning' and declines in abundance of freshwater animals, a 'great shrinking' in body size with reductions in large species, and a 'great mixing' whereby the spread of introduced species has tended to homogenize previously dissimilar communities in different parts of the world. Climate change and warming temperatures will alter global water availability, and exacerbate the other threat factors. What conservation action is needed to halt or reverse these trends, and preserve freshwater biodiversity in a rapidly changing world? This book offers the tools and approaches that can be deployed to help conserve freshwater biodiversity.
Author:
Publisher:
ISBN:
Category : Greek letter societies
Languages : en
Pages : 628
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Author: Ian Charles Campbell
Publisher: Academic Press
ISBN: 0080920632
Category : Science
Languages : en
Pages : 647
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Book Description
The Mekong is the most controversial river in Southeast Asia, and increasingly the focus of international attention. It flows through 6 counties, China, Myanmar, Laos, Thailand, Cambodia and Viet Nam. The 4 downstream countries have formed the Mekong River Commission to promote sustainable development of the river and many of their people depend on it for their subsistence ? it has possible the largest freshwater fishery in the world, and the Mekong waters support rice agriculture in the delta in Viet Nam (which produces about 40% of that country's food) as well as in Cambodia, Laos and Thailand. China is now building the first large mainstream dam on the river, and has proposals for several more. These dams are likely to affect the downstream countries. Several of the downstream countries also have plans for large scale hydropower and irrigation development which could also impact the river. This book will provide a solid overview of the biophysical environment of the Mekong together with a discussion of the possible impacts, biophysical, economic and social, of some possible development scenarios. It is intended to provide a technical basis which can inform the growing political and conservation debate about the future of the Mekong River, and those who depend on it. It is aimed at river ecologists, geographers, environmentalists and development specialists both in the basin and (especially) outside for whom access to this material is most difficult. This book will be the first comprehensive treatment of the Mekong system. The first comprehensive overview of all aspects of the Mekong River system Deals with a regionally critical ecosystem and one under threat The Mekong supports the world's largest freshwater fishery and provides water underpinning a major regional rice paddy system Presents the authoritative findings of the Mekong River Commission's research for a wider audience for the first time outside of limited distribution reports
Author: Martyn Lucas
Publisher: John Wiley & Sons
ISBN: 0470999640
Category : Technology & Engineering
Languages : en
Pages : 440
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Book Description
Recent studies have increasingly demonstrated the widespread existence of spatio-temporal variations in the abundance and distribution of species of freshwater fishes, previously assumed not to move between habitats. These movements are often on a seasonal or ontogenetic basis, for spawning, feeding and refuge, and in many cases are fundamental for the successful completion of lifecycles. This important book provides a single source for a range of previously widely dispersed information on these movements of fish in fresh waters, covering potamodromous fishes as well as the more familiar diadromous species, worldwide. Contents include full descriptions of types of migration and spatial behaviour, the stimulus and capacity for fish to migrate, the effects of climate on patterns of migratory behaviour, a taxonomic analysis (mostly by family) of freshwater fish migration, methods for studying migration, and details of the impacts of man's activities on freshwater fish migration. Migration of Freshwater Fishes provides an excellent and comprehensive reference to which the river manager, biologist or student can now refer to obtain information, advice and current opinion on the migratory behaviour of most taxonomic groups of fishes occurring in fresh water. University libraries and aquatic research stations should also have copies of this essential reference book on their shelves. Well-known international authors. Of great commercial importance to fisheries and professional angling bodies. Draws together much new information in one place. Detailed review of world wide migratory behaviour for most groups of freshwater fishes. Pure and applied relevance, for academics, fisheries scientists, river managers and conservationists. This comprehensive book includes 67 tables and figures and over 1,400 references.
Author:
Publisher: IUCN
ISBN: 2831714249
Category : Freshwater biodiversity
Languages : en
Pages : 172
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Author: David Dudgeon
Publisher: Elsevier
ISBN: 0080557171
Category : Science
Languages : en
Pages : 343
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Book Description
Tropical Stream Ecology describes the main features of tropical streams and their ecology. It covers the major physico-chemical features, important processes such as primary production and organic-matter transformation, as well as the main groups of consumers: invertebrates, fishes and other vertebrates. Information on concepts and paradigms developed in north-temperate latitudes and how they do not match the reality of ecosystems further south is expertly addressed. The pressing matter of conservation of tropical streams and their biodiversity is included in almost every chapter, with a final chapter providing a synthesis on conservation issues. For the first time, Tropical Stream Ecology places an important emphasis on viewing research carried out in contributions from international literature. First synthetic account of the ecology of all types of tropical streams Covers all of the major tropical regions Detailed consideration of possible fundamental differences between tropical and temperate stream ecosystems Threats faced by tropical stream ecosystems and possible conservation actions Descriptions and synstheses life-histories and breeding patterns of major aquatic consumers (fishes, invertebrates)
