The Role of Body Size in the Habitat Choice and Foraging Behaviour of Juvenile Coho Salmon Under Predation Risk PDF Download
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Languages : en
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Author: Jae-Woo Kim
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Languages : en
Pages : 0
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Despite the wealth of laboratory studies, the effects of local predation risk on the behaviour and ecology of a prey species under natural conditions have rarely been examined. In Chapter 1, I tested the hypothesis that juvenile Atlantic salmon (Salmo salar) use both chemical and visual information to assess predation risk under natural conditions. Both young-of-the-year (YOY) and parr salmon exhibited antipredator responses when exposed to a chemical alarm cue and exposure to alarm cues influenced their response to a visual threat. While YOY and parr differed in the type and intensity of antipredator responses, both chemical and visual cues are used in an additive manner. In Chapter 2, I tested the prediction that YOY use chemical alarm cues to assess the predation risk of alternative habitats and decide where to settle over a two-week period following emergence. In seven similar reaches of Catamaran Brook, New Brunswick, I established three contiguous sections where I manipulated the perceived predation risk by releasing alarm cues versus a stream water control. The density of YOY decreased in risky sections and increased in control and untreated buffer sections, whereas the density of parr was not affected. Clearly, YOY salmon can assess and select habitats based on the perceived level of predation risk. If one assumes that predation risk is a cost, optimality models predict that territory size will decrease with increasing predation risk. In Chapter 3, I examined whether both acute and chronic predation risk influences the territorial behaviour of YOY. When exposed to a single dose of chemical alarm cue, YOY salmon decreased the number of switches between foraging stations, but did not change their territory size or foraging rate. When exposed to chemical alarm cue over a two week period, YOY salmon reduced the size of their territories, but did not change their foraging rate or number of switches. Clearly, YOY adjusted their territorial behaviour in response to both acute and chronic increases in perceived predation risk, but in different ways. Together, my results suggest that predation risk influences not only short-term (immediate) anti-predator behaviour, but is also an important component of habitat selection and shapes territorial behaviour over longer periods.
Author: R. Hughes
Publisher: John Wiley & Sons
ISBN: 1444314017
Category : Science
Languages : en
Pages : 233
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All animals feed selectively. This book examines the selectivity of feeding from a variety of viewpoints. It examines the viewpoint of the behavioural ecologist that considers decision rules, the dietitian that looks at nutritional problems, and the community ecologist that sees feeding as a factor influencing species diversity. The text brings these diverse disciplines together to produce a coherent view of the way in which organisms 'choose' their diet. Optimal foraging theory has brought the study of foraging behaviour, particularly diet selection to a point where physiological, nutritional, psychological, morphological and ecological factors can begin to be addressed in a coherent fashion. This book is not another exposition of optimal foraging theory, but it does draw on the applications and limitations of the theory to demonstrate the great potential for the development of diet selection as an interdisciplinary subject. Authoritative synthesis of the latest thinking in optimal foraging and feeding theory. Adopts, for the first time, a truly interdisciplinary approach to diet selection. Authored by experts from each of the contributing fields.
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Category : Zoology
Languages : en
Pages : 552
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Category : Dissertations, Academic
Languages : en
Pages : 790
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![The Foraging Ecology of Juvenile Coho Salmon [microform] : Body Size, Diet Selection, and Intraspecific Competition PDF](https://books.google.com/books/content/images/frontcover/QF0CywEACAAJ?fife=w80-h100)
Author: Robert L. Dunbrack
Publisher: National Library of Canada
ISBN: 9780315180260
Category : Coho salmon
Languages : en
Pages : 418
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Category : Aquatic sciences
Languages : en
Pages : 720
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Category : Fish culture
Languages : en
Pages : 284
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Languages : en
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Author: Luc-Alain Giraldeau
Publisher: Princeton University Press
ISBN: 0691188343
Category : Science
Languages : en
Pages : 379
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Although there is extensive literature in the field of behavioral ecology that attempts to explain foraging of individuals, social foraging--the ways in which animals search and compete for food in groups--has been relatively neglected. This book redresses that situation by providing both a synthesis of the existing literature and a new theory of social foraging. Giraldeau and Caraco develop models informed by game theory that offer a new framework for analysis. Social Foraging Theory contains the most comprehensive theoretical approach to its subject, coupled with quantitative methods that will underpin future work in the field. The new models and approaches that are outlined here will encourage new research directions and applications. To date, the analysis of social foraging has lacked unifying themes, clear recognition of the problems inherent in the study of social foraging, and consistent interaction between theory and experiments. This book identifies social foraging as an economic interaction between the actions of individuals and those of other foragers. This interdependence raises complex questions about the size of foraging groups, the diversity of resources used, and the propensity of group members to exploit each other or forage cooperatively. The models developed in the book will allow researchers to test their own approaches and predictions. Many years in development, Social Foraging Theory will interest researchers and graduate students in such areas as behavioral ecology, population ecology, evolutionary biology, and wildlife management.
