Download or read book Spatial Habitat Use of Young of the year Atlantic Salmon Salmo Salar in Response to Changing Stream Discharge and Population Density written by Christian Franz Holm and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Salmonid Fisheries written by Paul Kemp and published by John Wiley & Sons. This book was released on 2011-06-13 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Salmonid Fisheries is a landmark publication, concentrating on river management, habitat restoration and rehabilitation, disseminating lessons learnt in relation to the intensively studied salmonids that are applicable to future interventions, not just for salmonid species but for other non-salmonid species, biota and ecosystems. The contents of this book are the product of the Atlantic Salmon Trust’s 40th Anniversary Conference, held in association with the Game and Wildlife Conservation Trust. Drawing together carefully-edited contributions from many of the world leaders in river restoration from academia, commercial management and government agencies, this important book highlights the need to view river management from the context of the catchment and to adopt an ecosystem-based approach to restoration. The book is broadly divided into two sections which discuss first, the status of current understanding concerning the relationship between lotic habitat management, the response of salmonid fisheries and the theory of river restoration, and secondly, the application of this to habitat management and river restoration. Salmonid Fisheries is an extremely valuable work of reference for fisheries managers, ecologists, environmental scientists, fish biologists, conservation biologists and geomorphologists. Libraries in all universities and research establishments where biological and earth sciences, and fisheries management are studied or taught should have copies of this book on their shelves. Contributions from a wide range of well known experts Published in association with the Atlantic Salmon Trust Habitat management is crucial for dwindling wild salmon populations Of great importance to aquatic ecologists and fisheries managers
Download or read book Patterns Predictors and Consequences of Space Use in Individually Tagged Young of the year Atlantic Salmon Salmo Salar written by Stefán Óli Steingrímsson and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Movement, at various spatial and temporal scales, plays a major role in shaping the ecology of animals at the individual and the population level. In this study, I applied recently developed tagging methods (visible implant fluorescent elastomers) to examine the space use of Atlantic salmon (Salmo salar) during their first growing season. First, I monitored 320 YOY salmon to test alternative views on the patterns (restricted vs. not-restricted), causes (competition vs. habitat use) and consequences (mobile fish of lower vs. equal fitness) of movement in stream fish. Most fish (mean = 63.8%) stayed in the study sites (10-120m) throughout their respective study season (28-74 days), and 61.8% of the re-sighted fish moved less than 1 m up- or downstream. Fish originally found in slow water moved farther than fish from fast water, and fish found at high population density were more likely to disappear than fish from low density. Mobile fish grew as fast, or faster, than more sedentary fish, suggesting that movement can be advantageous. Second, I mapped the daily territories of tagged YOY salmon to test if the typical single-central-place view of territoriality among YOY salmonids holds when fish are followed for longer periods, at low population densities. In contrast to earlier studies, YOY salmon visited several foraging stations (median = 12.5; range = 3-26) within their territories, and showed limited fidelity to any particular station. When mapped around several stations, rather than assuming one station as is customary, territories of YOY salmon were larger than previous reported (mean = 0.932 m 2), were less circular in shape, and were elongated along the stream length rather than the stream width. Although the study fish used large multiple-central-place territories, aggressive acts directed toward other YOY Atlantic salmon were usually found on the outskirts of these areas, suggesting these were fairly efficiently defended against conspecifics. A literature review suggested that YOY salmonids defend small territories from one central-place foraging station at high population density, but use several stations and large territories at low density. Third, as current velocity, prey abundance and prey mobility increase, stream-fish are predicted to become less mobile, use smaller home ranges, and become more aggressive as they switch from "cruising" to "sit-and-wait" foraging. I tested if these predictions held for YOY Atlantic salmon that specialize as sit-and-wait foragers, but vary in the number of foraging stations visited and the distance traveled within a territory (15.7-95.0 m/40min). As predicted, territory size decreased with increasing current velocity and prey availability. YOY salmon, however, were most mobile and attacked intruders more often at intermediate, optimal, current velocities. These findings, and the fact that fish in slow water do not feed more on benthic prey than fish in fast water, suggest that mobility in YOY Atlantic salmon reflects the patrolling of territories, rather than just the direct exploitation of other food resources than drifting prey.
Download or read book Distribution and Habitat Use by Juvenile Atlantic Salmon Salmo Salar at Multiple Spatial Scales and Implications for Habitat Modelling and Fish habitat Management written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2010 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology of Atlantic Salmon and Brown Trout written by Bror Jonsson and published by Springer Science & Business Media. This book was released on 2011-05-03 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2002 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theses on any subject submitted by the academic libraries in the UK and Ireland.
Download or read book Foraging and Growth in Relation to Habitat Use of Young of the year Atlantic Salmon Salmo Salar written by Isabelle Girard and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using snorkeling observations, I examined the habitat use and preference of 216 individually tagged young-of-the-year Atlantic salmon in their first summer of life, using both a univariate and a multivariate approach. Habitat preference was determined by comparing the habitat used by fish to that available in the stream. The univariate analyses showed that salmon preferentially used a wide range of current velocity (6-48 cm·s -1) and water depth (20-39 cm) and a narrower range of cover (complete cover from aerial predators) and substrate (pebbles). However, a multivariate logistic regression approach showed that only water depth and current velocity were key variables in habitat selection. Indeed, habitat preference of salmon increased with current velocity and water depth and then decreased at water depths above 30 cm. Drift rate within the stream was surveyed in order to predict food abundance for each fish in the study site. Correlates of fitness (i.e. foraging rate and growth rate) were also measured to relate individual fitness of each fish to their habitat choice. The results showed that y-o-y Atlantic salmon did not grow at a faster rate in the preferred habitats, despite the increase in food abundance and a higher foraging rate. I suggest that young-of-the-year salmon can grow reasonably well in a variety of habitat types and that the ideal free distribution may be a better description of their habitat use than the ideal despotic distribution.
Download or read book Age Growth and Mortality of Juvenile Atlantic Salmon in Streams written by Patrick W. Bley and published by . This book was released on 1987 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production of Juvenile Atlantic Salmon Salmo Salar in Natural Waters written by National Research Council Canada and published by NRC Research Press. This book was released on 1993 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book 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 written by Jennifer Fitzgerald and published by . This book was released on 1999 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Innate Migratory Behavior and Spawning Habitat Use by Landlocked Atlantic Salmon written by Matthew Jeremy Nemeth and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Suitability Index Models written by Jon G. Stanley and published by . This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model was developed by evaluating individual suitability indices of 17 environmental variables that have been shown to affect productivity or survival of nonmigratory freshwater life history stages of Atlantic salmon (Salmo salar L.).
Download or read book Brown Trout written by Javier Lobón-Cerviá and published by John Wiley & Sons. This book was released on 2017-10-13 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brown Trout: Biology, Ecology and Management A comprehensive guide to the most current research, history, genetics and ecology of the brown trout including challenging environmental problems The brown trout is an iconic species across its natural European distribution and has been introduced throughout the World. Brown Trout offers a comprehensive review of the scientific information and current research on this major fish species. While the brown trout is the most sought species by anglers, its introduction to various waters around the world is causing serious environmental problems. At the same time, introduction of exogenous brown trout lineages threats conservation of native gene pools of populations in many regions. The authors summarize the important aspects of the brown trout’s life history and ecology and focus on the impact caused by the species. The text explores potential management strategies in order to maintain numerous damaged populations within its natural distributional range and to ameliorate its impacts in exotic environments. The authors include information on a wide-range of topics such as recent updates in population genetics, evolutionary history, reproductive traits and early ontogeny, life history plasticity in anadromous brown trout and life history of the adfluvial brown trout and much more. This vital resource: Contains the latest research on the biology and ecology of brown trout Includes information on phylogeography, genetics, population dynamics and stock management Spotlights the brown trout’s introduction to regions around the world and the serious environmental impacts Offers a comprehensive review of conservation and management techniques Written for salmonid scientists and researchers, fishery and environmental managers, and students of population genetics, ecology and population dynamics, Brown Trout explores the most recent findings on the history, ecology and sustainability of this much-researched species.
Download or read book Territoriality and Population Regulation in Juvenile Salmonids written by István Imre and published by . This book was released on 2003 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Variability and the Individual Variability of Juvenile Atlantic Salmon Salmo Salar written by Mathieu Roy and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Allometry of Territory Size and Metabolic Rate as Predictors of Self thinning in Young of the year Atlantic Salmon Salmo Salar written by Stefán Óli Steingrímsson and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-thinning is a progressive decline in population density caused by competitively induced losses in a cohort of growing individuals and is frequently depicted as: $\log\sb?$ (density) = $\rm c -\beta\log\sb?$ (body mass). In mobile animals, two self-thinning mechanisms have been proposed. The territory-size hypothesis predicts that maximum population density for a given body size is set by the allometry of territory size. The energetic equivalence hypothesis suggests that if there is a constant amount of energy flowing through a population, the self-thinning slope is set by the allometry of metabolic rate. I tested the predictions of both hypotheses by monitoring body size, food availability, habitat features and population density for young-of-the-year Atlantic salmon (Salmo salar) in Catamaran Brook, New Brunswick, throughout their first growing season. In general, the results were consistent with the predictions of the territory-size hypothesis since the observed densities were high enough to expect competition for space while they did not exceed the maximum densities predicted. Moreover, the observed self-thinning slope of $-$1.16 was consistent with the slope predicted by the allometry of territory size established specifically for the population under study. The overall slope, however, was steeper than predicted by the allometry of metabolic rate, most likely because of a gradual decline in food abundance over the study period. The results suggest that territoriality may play a role as a mechanism of self-thinning in populations of indeterminate growers competing for food and space.
