Download or read book Genetic Diversity and Population Structure of the Non native Eastern Mosquitofish Gambusia Holbrooki in Mediterranean Streams written by David Díez del Molino and published by . This book was released on 2015 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biologie des poissons d eau douce europ ens 2e d written by BRUSLÉ Jacques and published by Lavoisier. This book was released on 2013-07-01 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biologie des poissons d’eau douce européens, par son champ d’étude vaste et ambitieux, est un ouvrage de référence en ichtyologie dulçaquicole. Couvrant l’ensemble des aspects écologiques, écobiologiques, écophysiologiques et éthologiques, il dresse une présentation détaillée de 88 espèces auto- ou allochtones : morphologie, anatomie, distribution géographique, habitats, modes de vie et activités physiologiques. 453 autres espèces sont également répertoriées. Cette 2e édition a été largement revue et augmentée, compte tenu de l’importance des données scientifiques récentes. Outre des compléments utiles portant sur les habitats et les modes de vie, cet ouvrage s’enrichit des nombreux apports génétiques qui ont parfois « révolutionné » les concepts anciens relatifs aux origines paléo-historiques et paléo-géographiques des espèces. Des extensions ou des réductions de répartitions géographiques ont été consécutives à des transferts d’origine anthropique, à des dégradations physiques et chimiques et à la récente influence du Global Warming, sans oublier les changements de statut dans le domaine de la systématique. Au fil d’un livre d’une grande rigueur scientifique, abondamment illustré (dont 64 aquarelles originales et plus de 70 cartes géographiques pertinentes) et complété par un glossaire et une importante bibliographie, le lecteur abordera la connaissance des poissons européens d’une façon à la fois originale et attrayante. Cet ouvrage s’adresse à un large public : étudiants de 2e et 3e cycles en biologie, zoologie, écologie, hydrobiologie, environnement, ingénieurs et techniciens chargés de l’aménagement, de la gestion, de la qualité et de la protection des milieux aquatiques (services vétérinaires, de l’Environnement, de l’Agriculture, de l’Équipement…) auxquels il apportera les bases fondamentales nécessaires à leur action, et plus largement tous les passionnés d’ichtyofaune.

Download or read book Genetic Diversity Comparison Among Invasive Fish Populations Nemipterus Randalli and Serranus Cabrilla from Mediterranean and Red Sea Coastal Waters Using Cytochrome C Oxidase Subunit I COI written by Joel Ogwang and published by . This book was released on 2019 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Since the Suez Canal connected the Red Sea with the Mediterranean, several fish species have migrated between the two seas. Nemipterus randalli has crossed from the Red Sea to the Mediterranean (Lessepsian migration) whereas Serranus cabrilla is considered to have crossed in the reverse direction (anti-Lessepsian migration). Genetic variation between populations of these fish species on either side of the Suez Canal might provide valuable information on their patterns of migration. In this study, 600 bp of cytochrome c oxidase subunit I (COI) sequences were used to compare genetic diversity of populations of N. randalli from the eastern Mediterranean with a population off the Red Sea coast near Hurghada, Egypt. For comparison, three other Nemipterus species were included. Similarly, genetic diversity of Serranus cabrilla from the Gulf of Suez was compared with populations in the eastern Mediterranean Sea. A Maximum Likelihood (ML) tree was constructed using Molecular Evolutionary Genetics Analysis version 7 (MEGA7) software to visualize the evolutionary relationships of S. cabrilla and Nemipterus species of the two seas. Population structures of N. randalli and S. cabrilla were assessed by constructing haplotype networks using PopART. Results from COI sequence divergence analysis revealed possible existence of cryptic species of N. bipunctatus in the Red Sea. Although the ML tree resolved Nemipterus species into four clades representing the four species analyzed, all N. randalli sequences from both seas formed a single clade. Genetic diversity analysis revealed that Mediterranean populations of N. randalli share one haplotype from the Red Sea and supported unidirectional multiple invasion events from the Red Sea to the Mediterranean Sea. Meanwhile, S. cabrilla sequences formed two phylogenetic clades representing the Gulf of Suez and eastern Mediterranean Sea populations. S. cabrilla from the Gulf of Suez also had a significantly reduced sequence divergence compared to Mediterranean Sea populations. In addition, none of the 17 haplotypes in the Mediterranean Sea was found among the 12 haplotypes in the Gulf of Suez. Together, these results provided evidence that the S. cabrilla population in the Gulf of Suez did not come from the Mediterranean Sea through the Suez Canal as was previously thought. According to these results, reported cases of invasion on either side of the Suez Canal should be followed by genetic investigations on a species-by-species basis.

Download or read book Genetic Diversity Within Non native Populations of Diadumene Lineata written by Joy Holtvluwer and published by . This book was released on 1997 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Impacts of Urbanization and Spatial Scale on Genetic Diversity of Blacknose Dace Rhinichthys Atratulus Populations written by April N. Marcangeli and published by . This book was released on 2013 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impacts of urbanization and spatial scale on genetic diversity of blacknose dace (Rhinichthys atratulus) populations Contemporary processes and environmental variation can be dominant forces that act on genetic variation of fishes in freshwater stream systems. The interaction among movement of individuals, spatial connectivity, and unidirectional flow of water in dendritic streams can determine the amount of gene flow along and among catchments and influence population persistence. In urbanized catchments, increased amounts of impervious surface cover surrounding urban streams results in hydrological changes that ultimately influence connectivity, movement, and effective population sizes. However, information is scarce regarding the effects of hydrological changes in urban streams on genetic diversity of freshwater fishes. I utilized microsatellites to compare genetic population structure of a headwater species, Rhinichthys atratulus, between two urban and two rural stream systems with similar dendritic structure to assess the effects of urbanization. Results show that urban watersheds exhibit lower genetic diversity and that the degree of urbanization can also lead to greater amounts of genetic structuring and differentiation. Additionally, I addressed the matter of spatial connectivity within stream networks by examining the amount of differentiation and structuring in populations separated by different spatial scales nested within each watershed. Adventitious streams in both rural and urban stream networks appear to be locations in the stream network representing limited gene flow, as these streams consistently exhibited lower levels of all genetic diversity measures.

Download or read book Isolation of Polymorphic Microsatellite Loci in the Western Mosquitofish Gambusia Affinis and an Evaluation of the Usefulness of These Loci for Measuring Genetic Diversity in Experimentally Bottlenecked Populations written by Christine Courtney Spencer and published by . This book was released on 1998 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Test for Outbreeding Depression written by Gerard B. Caddick and published by . This book was released on 1994 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wildlife Research written by and published by . This book was released on 2003 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Diversity and Population Structure of the Invasive Goby Species Ponticola Kessleri in Kleinhueningen and Birsfelden written by Peter Mutzner and published by . This book was released on 2012 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Portraits of Introduced Gobies and Mussels written by Joshua E. Brown and published by . This book was released on 2009 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing numbers of species introductions, with many having significant ecological and economic impacts, constitute one of the greatest challenges facing our native ecosystems today. To make correct ecological comparisons among native and introduced populations and minimize their further spread, we must (1) identify the introduced species/taxon/population correctly and (2) determine its source population(s) and its transmission pathways. This dissertation study analyzes and compares the population genetic and phylogeographic structure of three successful invasions by Ponto-Caspian species into the North American Great Lakes and beyond: the round goby Neogobius melanostomus and the dreissenid mussels Dreissena polymorpha and Dreissena rostriformis bugensis. In Chapters 2 and 3 we describe evidence for two subspecies of round goby, both of which have expanded their range. From this background information, likely sources are identified for invasive populations in Eurasia and North America. In Chapter 4, the genetic structure of zebra and quagga mussels in North America is analyzed in comparison with sites in Eurasia. Zebra mussel populations have appreciable genetic diversity, whereas quagga mussel populations from the Colorado River and California show some founder effects. The population genetic composition of both species changed over time at given sites; with some adding alleles from adjacent populations, some losing them, and all retaining closest similarity to their original composition. Zebra and quagga mussels from the western United States assign to possible origins from the St. Lawrence River and Lake Ontario, respectively. These assignments suggest that overland colonization pathways via recreational boats do not necessarily reflect the most proximate connections. The results show that all three species likely experienced multiple introductions into the Great Lakes, which brought a large proportion of the native genetic diversity to North America. This created significant genetic structure within their respective introduced ranges. The round goby and the quagga mussel were introduced from their native range, in contrast to the zebra mussel which whose origins North American origins trace to secondary spread from previously invaded regions in Northern and Central Europe. This dissertation demonstrates the utility of molecular techniques to invasive species management, by identifying the pathways connecting source populations to new colonies.

Download or read book Fishes of the Murray Darling Basin written by Mark Lintermans and published by . This book was released on 2007 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Handbook of Global Freshwater Invasive Species written by Robert A. Francis and published by Routledge. This book was released on 2012-03-12 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive non-native species are a major threat to global biodiversity. Often introduced accidentally through international travel or trade, they invade and colonize new habitats, often with devastating consequences for the local flora and fauna. Their environmental impacts can range from damage to resource production (e.g. agriculture and forestry) and infrastructure (e.g. buildings, road and water supply), to human health. They consequently can have major economic impacts. It is a priority to prevent their introduction and spread, as well as to control them. Freshwater ecosystems are particularly at risk from invasions and are landscape corridors that facilitate the spread of invasives. This book reviews the current state of knowledge of the most notable global invasive freshwater species or groups, based on their severity of economic impact, geographic distribution outside of their native range, extent of research, and recognition of the ecological severity of the impact of the species by the IUCN. As well as some of the very well-known species, the book also covers some invasives that are emerging as serious threats. Examples covered include a range of aquatic and riparian plants, insects, molluscs, crustacea, fish, amphibians, reptiles and mammals, as well as some major pathogens of aquatic organisms. The book also includes overview chapters synthesizing the ecological impact of invasive species in fresh water and summarizing practical implications for the management of rivers and other freshwater habitats.

Download or read book Freshwater Biodiversity written by David Dudgeon and published by Cambridge University Press. This book was released on 2020-05-21 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Rivers of Greece written by Nikos Skoulikidis and published by Springer. This book was released on 2017-11-16 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides essential information on the origin and evolution of Greek rivers, as well as their ecological and anthropogenic characteristics. The topics covered include geomythology, biogeography, hydrology, hydrobiology, hydrogeochemistry, geological and biogeochemical processes, anthropogenic pressures and ecological impacts, water management – both in the antiquity and today – and river restoration. The book is divided into four parts, the first of which explores the importance of rivers for ancient Greek civilization and the natural processes affecting their evolution during the Holocene. In the second part, the hydrological, hydrochemical and biological features of Greek rivers and the unique biogeographical characteristics that form the basis for their high biodiversity and endemism are highlighted, while the third part comprehensively discusses the impacts of environmental pollution on the structure and function of Greek river ecosystems. In turn, the final part describes the current socio-economic factors in Greece that are affecting established water management practices, the application of ecohydrological approaches in restoring fragmented rivers, and the lessons learned from restoring aquatic ecosystems in general as a paradigm for understanding and minimizing anthropogenic impacts on water resources, at the Mediterranean scale. Given the breadth and depth of its coverage, the book offers an invaluable source of information for researchers, students and environmental managers alike.

Download or read book The Hybridization Between the Endangered Gambusia Nobilis and Introduced Gambusia Geiseri in Texas written by Victoria Rodriguez and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduced species are a major cause of biodiversity loss because of predation, competition for limited resources and space, and hybridization with native taxa. Hybridization poses the greatest risk for native taxa when the non-native and native taxa are closely related. This can compromise the genetic structure of native populations and drive those taxa to extinction. Moreover, the extinction risk to native taxa by hybridization with non-native is greatest when native taxa are rare (e.g., endangered or threatened) because rare taxa often lack the genetic variation necessary mitigate ongoing hybridization events. Herein, we provide morphological and genetic evidence to suggest that the introduced Largespring Gambusia (Gambusia geiseri) and endangered Pecos Gambusia (Gambusia nobilis) are hybridizing within the San Solomon Spring complex, Reeves, Company Texas. We inferred hybridization and gene flow from data collected on seven morphometric characters, nine meristic measurements, and five molecular markers (the mitochondrial gene Cytb; nuclear genes Rag 1, Rag 2, and RPS7; and one microsatellite) from the two species and the putative hybrid. The results support morphological intermediacy and mixed genetic heritage of Gambusia nobilis and Gambusia geiseri in some individuals. In addition, we were able to infer extensive hybridization and introgression over several generations. Thus, alternate conservation efforts may be needed to counteract the effects hybridization on the endangered Pecos Gambusia. The electronic version of this dissertation is accessible from http://hdl.handle.net/20.500.11875/2244

Download or read book Conservation of Freshwater Fishes written by Maria Collares Pereira and published by Wiley. This book was released on 2002-08-23 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topic of fish conservation is of great interest to a wide range of scientists. This exciting new book draws together contributions from scientists from all over the globe providing a unique compilation of material looking at fish conservation issues from a wide range of standpoints. Environmental pressures, introduced species and over fishing are all key issues covered in this important new volume. It should find a place on the shelves of all conservation biologists, fisheries scientists and acquatic scientists. Wide range of internationally known contributors. Covers a wide range of topics of key current interest to fisheries workers. Edited by two internationally known experts in fish biology and fisheries.

Download or read book Identifying the Geographic Origins for the Introduction of Taeniatherum Caput medusae Subsp Asperum medusehead in the Western United States written by Shane Kurtis Skaar and published by . This book was released on 2015 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The use of molecular markers can provide insights into the demographic and evolutionary processes that have shaped the genetic diversity of native populations and can be used to identify an invasive species' geographic origins. Taeniatherum caput-medusae subsp. asperum (medusahead) is a cleistogamous, diploid, annual grass native toEurasia that is now invasive in the western United States (U.S.). Enzyme electrophoresis methods (allozymes) have previously been used to analyze both native and invasive populations of medusahead. Results from these studies suggest that the invasion of medusahead in the westernU.S. stems from multiple introduction events. In addition, 10 of 34 populations from across the native range of the species possessed multilocus genotypes that match some of those detected in invasive populations, with six of these putative source populations located inGreece andNorthwestern Turkey. The overall objective of the current study is to better circumscribe the geographic origins for this invasion through allozyme analysis of 48 native populations of medusahead from Southeastern Europe (Albania, Bulgaria, Greece, Macedonia, Romania, Serbia, Northwestern Turkey, and Ukraine) and South-central Turkey. Among the 48 native populations I analyzed, a total of 35 multilocus genotypes were detected, with four of these genotypes matching those previously reported among invasive populations. Forty of the 48 (83.3%) native populations contained at least one individual with a multilocus genotype matching a genotype reported among invasive populations. The 48 populations from Southeastern Europe andSouth-central Turkey exhibit less genetic structure and display lower levels of genetic diversity compared with the 34 native populations previously analyzed. Also, the genetic diversity of these 48 populations is not geographically structured; it does not conform to an isolation-by-distance pattern. Taken together, results from this study suggest that the geographic origins of this invasion occur broadly across the study region. In addition, the genetic diversity of these 48 native populations appears to be influenced by stochastic demographic processes in which an individual or individuals with various genotypes randomly colonizes disturbed sites and establishes a population. This process has led to an intermixing of genotypes within and among populations across the study area. Because allozymes typical underestimate the genetic diversity of populations, the findings of this study should be assessed using a molecular marker with greater resolving power (i.e., amplified fragment length analysis)."--Boise State University ScholarWorks.