The Ecology Genetics And Conservation Of Migratory Catfish Pangasiidae In The Mekong River PDF Download
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Author | : Zeb Shelton Hogan |
Publisher | : |
Total Pages | : 396 |
Release | : 2004 |
Genre | : |
ISBN | : |
Download The Ecology, Genetics, and Conservation of Migratory Catfish (Pangasiidae) in the Mekong River Book in PDF, ePub and Kindle
Author | : Huong Thanh Hoang |
Publisher | : |
Total Pages | : 142 |
Release | : 2019 |
Genre | : Genetic recombination |
ISBN | : |
Download Genetic Relationships Using Mitochondrial Versus Nuclear Markers Book in PDF, ePub and Kindle
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 | : |
Total Pages | : 70 |
Release | : 2004 |
Genre | : |
ISBN | : |
Download Microsatellite Diversity and Structure of the Southeast Asian Migratory Catfish Pangasius Bocourti in the Mekong River Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 796 |
Release | : 2005 |
Genre | : Dissertations, Academic |
ISBN | : |
Download Dissertation Abstracts International Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 628 |
Release | : 1942 |
Genre | : Greek letter societies |
ISBN | : |
Download American Scientist Book in PDF, ePub and Kindle
Author | : David Dudgeon |
Publisher | : Cambridge University Press |
Total Pages | : 517 |
Release | : 2020-05-21 |
Genre | : Nature |
ISBN | : 1108882625 |
Download Freshwater Biodiversity Book in PDF, ePub and Kindle
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 | : Martyn Lucas |
Publisher | : John Wiley & Sons |
Total Pages | : 440 |
Release | : 2008-04-15 |
Genre | : Technology & Engineering |
ISBN | : 0470999640 |
Download Migration of Freshwater Fishes Book in PDF, ePub and Kindle
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 | : Walter J. Rainboth |
Publisher | : Food & Agriculture Org. |
Total Pages | : 340 |
Release | : 1996 |
Genre | : Business & Economics |
ISBN | : 9789251037430 |
Download Fishes of the Cambodian Mekong Book in PDF, ePub and Kindle
This field guide covers the major resource groups likely to be encountered in the fisheries of the Cambodian Mekong. These groups include sharks, batoid fishes and bony fishes. The introduction outlines the geographical, environmental and ecological factors influencing fisheries, and the basic components of the fisheries of the Cambodian Mekong. As an aid to identification to higher taxonomic levels, a pictorial index to families and an illustrated guide to orders and families are included. Each species account provides scientific nomenclature, FAO names in English, local names, sizes, notes on fisheries, habitat and biology, and one or more illustrations. The guide is fully indexed and a list of related literature is appended. Finally, 27 colour plates are presented.
Author | : Bridget S. Green |
Publisher | : Springer Science & Business Media |
Total Pages | : 313 |
Release | : 2009-08-07 |
Genre | : Science |
ISBN | : 140205775X |
Download Tropical Fish Otoliths: Information for Assessment, Management and Ecology Book in PDF, ePub and Kindle
Techniques and theory for processing otoliths from tropical marine fish have developed only recently due to an historic misconception that these organisms could not be aged. Otoliths are the most commonly used structures from which daily, seasonal or annual records of a fish’s environmental history are inferred, and are also used as indicators of migration patterns, home range, spatial distribution, stock structure and life history events. A large proportion of projects undertaken on tropical marine organisms involve removal and processing of calcified structures such as otoliths, statoliths or vertebrae to retrieve biological, biochemical or genetic information. Current techniques and principles have evolved rapidly and are under constant modification and these differ among laboratories, and more particularly among species and within life history stages. Tropical fish otoliths: Information for assessment, management and ecology is a comprehensive description of the current status of knowledge about otoliths in the tropics. This book has contributions from leading experts in the field, encompassing a tropical perspective on daily and annual ageing in fish and invertebrates, microchemistry, interpreting otolith microstructure and using it to back-calculate life history events, and includes a treatise on the significance of validating periodicity in otoliths.
Author | : |
Publisher | : IUCN |
Total Pages | : 172 |
Release | : 2012 |
Genre | : Freshwater biodiversity |
ISBN | : 2831714249 |
Download The status and distribution of freshwater biodiversity in Indo-Burma Book in PDF, ePub and Kindle