Variation In Spawning Age And Body Size Of Adult Atlantic Salmon Salmo Salar In Scottish River In Relation To River Length Flow Rate And Water Temperature
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Ecology of Atlantic Salmon and Brown Trout
Author | : Bror Jonsson |
Publisher | : Springer Science & Business Media |
Total Pages | : 720 |
Release | : 2011-05-03 |
Genre | : Science |
ISBN | : 9400711891 |
Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance. The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species.
Introduction to Hierarchical Bayesian Modeling for Ecological Data
Author | : Eric Parent |
Publisher | : CRC Press |
Total Pages | : 429 |
Release | : 2012-08-21 |
Genre | : Mathematics |
ISBN | : 1584889195 |
Making statistical modeling and inference more accessible to ecologists and related scientists, Introduction to Hierarchical Bayesian Modeling for Ecological Data gives readers a flexible and effective framework to learn about complex ecological processes from various sources of data. It also helps readers get started on building their own statistical models. The text begins with simple models that progressively become more complex and realistic through explanatory covariates and intermediate hidden states variables. When fitting the models to data, the authors gradually present the concepts and techniques of the Bayesian paradigm from a practical point of view using real case studies. They emphasize how hierarchical Bayesian modeling supports multidimensional models involving complex interactions between parameters and latent variables. Data sets, exercises, and R and WinBUGS codes are available on the authors’ website. This book shows how Bayesian statistical modeling provides an intuitive way to organize data, test ideas, investigate competing hypotheses, and assess degrees of confidence of predictions. It also illustrates how conditional reasoning can dismantle a complex reality into more understandable pieces. As conditional reasoning is intimately linked with Bayesian thinking, considering hierarchical models within the Bayesian setting offers a unified and coherent framework for modeling, estimation, and prediction.
Atlantic Salmon (Salmo Salar) of the Big Salmon River, New Brunswick
Author | : B. M. Jessop |
Publisher | : Halifax, N.S. : Fisheries and Oceans, Canada |
Total Pages | : 66 |
Release | : 1986 |
Genre | : Atlantic salmon |
ISBN | : |
Temporal and Spatial Variability in Density, Relative Condition, Gender Composition and Maturity Status of Atlantic Salmon (Salmo Salar L.) Parr in the Harry's River Drainage System, Insular Newfoundland
Author | : Jennifer Fitzgerald |
Publisher | : |
Total Pages | : 192 |
Release | : 1999 |
Genre | : Atlantic salmon |
ISBN | : |
Age, Growth, and Mortality of Juvenile Atlantic Salmon in Streams
Author | : Patrick W. Bley |
Publisher | : |
Total Pages | : 38 |
Release | : 1987 |
Genre | : Atlantic salmon |
ISBN | : |
Atlantic Salmon Ecology
Author | : Øystein Aas |
Publisher | : John Wiley & Sons |
Total Pages | : 492 |
Release | : 2011-07-05 |
Genre | : Technology & Engineering |
ISBN | : 1444348191 |
The Atlantic salmon is one of the most prized and exploited species worldwide, being at the centre of a massive sports fishing industry and increasingly as the major farmed species in many countries worldwide. Atlantic Salmon Ecology is a landmark publication, both scientifically important and visually attractive. Comprehensively covering all major aspects of the relationship of the Atlantic salmon with its environment, chapters include details of migration and dispersal, reproduction, habitat requirements, feeding, growth rates, competition, predation, parasitsm, population dynamics, effects of landscape use, hydro power development, climate change, and exploitation. The book closes with a summary and look at possible future research directions. Backed by the Norwegian Research Council and with editors and contributors widely known and respected, Atlantic Salmon Ecology is an essential purchase for all those working with this species, including fisheries scientists and managers, fish biologists, ecologists, physiologists, environmental biologists and aquatic scientists, fish and wildlife department personnel and regulatory bodies. Libraries in all universities and research establishments where these subjects are studied and taught should have copies of this important publication. Comprehensive and up-to-date coverage of Atlantic Salmon Atlantic Salmon is one of the world's most commercially important species Backed by the Norwegian Research Council Experienced editor and internationally respected contributors
Production of Juvenile Atlantic Salmon, Salmo Salar, in Natural Waters
Author | : National Research Council Canada |
Publisher | : NRC Research Press |
Total Pages | : 276 |
Release | : 1993 |
Genre | : Technology & Engineering |
ISBN | : 9780660149547 |
Up-to-date information, knowledge and research in progress in scientific fields related to natural production of juvenile Atlantic salmon and some other ecologically similar fluvial salmonids is contained in the 25 papers and 12 abstracts contained in this publication, which were prepared for an international symposium held in St. John's, Newfoundland. Studies relate to stream ecology, invertebrates and predators, habitat improvement, competitive effects, behaviour and dispersal, habitat and production of juvenile salmon, population dynamics and relationships of juvenile salmon estimates to smolt yields. A list of participants at the conference is also provided.
Microevolution Rate, Pattern, Process
Author | : Andrew P. Hendry |
Publisher | : Springer Science & Business Media |
Total Pages | : 528 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9401005850 |
From guppies to Galapagos finches and from adaptive landscapes to haldanes, this compilation of contributed works provides reviews, perspectives, theoretical models, statistical developments, and empirical demonstrations exploring the tempo and mode of microevolution on contemporary to geological time scales. New developments, and reviews, of classic and novel empirical systems demonstrate the strength and diversity of evolutionary processes producing biodiversity within species. Perspectives and theoretical insights expand these empirical observations to explore patterns and mechanisms of microevolution, methods for its quantification, and implications for the evolution of biodiversity on other scales. This diverse assemblage of manuscripts is aimed at professionals, graduate students, and advanced undergraduates who desire a timely synthesis of current knowledge, an illustration of exciting new directions, and a springboard for future investigations in the study of microevolution in the wild.