Download or read book Grey seal Halichoerus grypus pup production at North Rona written by C.F. SUMMERS and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The grey seal Halichoerus grypus at North Rona 1959 to 1968 written by J.M. BOYD and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations of the grey seal Halichoerus grypus at North Rona in 1960 written by J.M. BOYD and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Stocks of Grey Seals Halichoerus Grypus and Common Seals Phoca Vitulina in Great Britain written by W. Nigel Bonner and published by . This book was released on 1976 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dingell Johnson Fund N Pacific Fur Seal written by United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Fisheries and Wildlife Conservation and the Environment and published by . This book was released on 1980 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behaviour of grey seals Halichoerus grypus during a breeding season at North Rona written by S.S. ANDERSON and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ethology and Behavioral Ecology of Phocids written by Daniel P. Costa and published by Springer Nature. This book was released on 2022-03-17 with total page 651 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phocid (or earless or true) seals are ecologically diverse, occupying habitats from the tropics to the poles in marine and freshwater and feeding on anything from tiny zooplankton to other marine mammals. There are 18 species of phocid seals, the smallest species (ringed seal) is more than 20 times smaller than the largest (southern elephant seal), with marked sexual dimorphism present in some species. This book examines the behavior, ecology, and physiology that allow phocid seals to inhabit such a wide range of habitats. The book is composed of 16 chapters written by 37 authors from 8 countries. The book first describes the general patterns of phocid behavior, followed by descriptions of what is known about well-studied species. We have taken a holistic approach, focusing not only on the behaviors themselves but also on the factors that constrain the expression of behavior and the proximate mechanisms driving behavior. In many cases, the chapters represent collaborations between well-established researchers and early-mid career individuals who bring new perspectives to help carry the field of phocid behavioral ecology well into the future.
Download or read book North American Fauna written by and published by . This book was released on 1975 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Birds of the St Croix River Valley Minnesota and Wisconsin written by Brooke Meanley and published by . This book was released on 1969 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed assessment of the relative abundance, seasonal occurrence, distribution, and habitat use of birds in the Kilbuck and Ahklun mountain region of Alaska.
Download or read book Fine scale Determinants of Female Grey Seal Halichoerus Grypus Pupping Site and Habitat Preferences at North Rona Scotland written by James Edward Stewart and published by . This book was released on 2013 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract:The grey seal (Halichoerus grypus) is widespread in the Northern Hemisphere and throughout its range hauls out to breed terrestrially on a variety of substrates. A major breeding site in the eastern North Atlantic is the remote island of North Rona, Scotland, which is characterised by undulating grassy terrain, with limited access to the sea, punctuated by irregularly spaced fresh to brackish water pools of variable size. Previous long term research at North Rona has suggested that the distribution of breeding females is influenced by key habitat features including proximity to pools of water and to access from the sea. Using distributional information available for the North Rona colony in conjunction with a set of ecologically relevant environmental predictors within an extensive GIS database, the ecological niche of the grey seal at North Rona was modelled using Ecological Niche Factor Analysis. This was used to determine the distribution of suitable habitat at the North Rona colony and to elucidate the environmental determinants of female pupping site, and subsequent habitat, preferences over multiple years spanning 1998-2010. The environmental predictors utilised were chosen based on the conclusions of previous research. Following the delineation of basic environmental preferences, the influence of social interactions was considered within this modelling approach to further help explain the distribution of pups of various stages. Adult female grey seals show a preference for both pupping sites and subsequent habitat near to pools of water of low salinity at intermediate distances to access points to the sea, though appear to exhibit stronger preferences regarding the characteristics of their habitat than pupping site. It is concluded that these preferences are a result of a requirement for proximity to pools for thermoregulation and for drinking water to avoid a negative water balance. However, females do not typically choose sites directly next to or within pools, this is a result of a trade-off between proximity to pools and proximity to their pup, which is at greater risk when separated from its mother, or close to pools in areas of high adult density. It also appears likely that females choose sites at intermediate proximity to access points as sites directly next to access points experience greater disturbance from other seals arriving to, or leaving, the colony. The widespread availability of apparently suitable habitat suggests that the North Rona colony is not restricted in size by limited availability of suitable pupping sites; other potential drivers of the decline of the North Rona colony are therefore discussed, with recommendations for future research. A parallel analysis investigating pup habitat use showed that weaned pups, unlike neonates, appear to avoid locations near to adult female grey seals. It is concluded that this is a result of social interactions driving weaned pups into areas abandoned, or not yet colonised, by adult females, which are aggressive towards conspecifics during lactation. Overall, the ENFA has provided an excellent means to assess the terrestrial pupping site and subsequent habitat preferences of the grey seal, though alternative approaches are suggested for also assessing social influences on space use.
Download or read book Stage Structured Populations written by Bryan Manly and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a review of methods for obtaining and analysing data from stage-structured biological populations. The topics covered are sam pling designs (Chapter 2), the estimation of parameters by maximum likelihood (Chapter 3), the analysis of sample counts of the numbers cif individuals in different stages at different times (Chapters 4 and 5), the analysis of data using Leslie matrix types of model (Chapter 6) and key factor analysis (Chapter 7). There is also some discussion of the approaches to modelling and estimation that have been used in five studies of particular populations (Chapter 8). There is a large literature on the modelling of biological populations, and a multitude of different approaches have been used in this area. The various approaches can be classified in different ways (Southwood, 1978, ch. 12), but for the purposes of this book it is convenient to think of the three categories mathematical, statistical and predictive modelling. Mathematical modelling is concerned largely with developing models that capture the most important qualitative features of population dynamics. In this case, the models that are developed do not have to be compared with data from natural populations. As representations of idealized systems, they can be quite informative in showing the effects of changing parameters, indicating what factors are most important in promoting stability, and so on.
Download or read book Problems in Management of Locally Abundant Wild Mammals written by P.A. Jewell and published by Elsevier. This book was released on 2012-12-02 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problems in Management of Locally Abundant Wild Mammals contains the proceedings of the Management of Locally Abundant Wild Mammals: A Workshop to Examine the Need for and Alternatives to the Culling of Wild Animals, held in Yarmouth Port, Massachusetts from September 29 to October 3, 1980. Contributors reexamine the scientific basis for possible management aimed at restraining local increase in numbers of locally abundant wild mammals, with emphasis on the issue of culling. This text is organized into six sections encompassing 19 chapters and begins with an overview of the dilemma of local overabundance or overpopulation of threatened mammals. In particular, it considers the extent to which past predictions have been fulfilled in practice, and whether understanding of the dynamics of living systems is adequate for useful prediction. This book also discusses the circumstances that allow a species to become so abundant and the adverse effects that arise. The chapters that follow present case studies that reflect experiences around the world concerning management of locally abundant mammals, including the white rhino in South Africa and deer in North America. This book also explores proposed solutions for problems involving the management of polar bear, the Northwest Atlantic humpback whale, and the British grey seal. This reference material is a valuable resource for zoologists, conservation biologists, and those with interest in the protection of wild mammals.
Download or read book The Behaviour of Pinnipeds written by D. Renouf and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: We teach our students of behavioural science that one first defines a research problem, and then the most appropriate animal is selected to investigate hypotheses. The reverse order of events is improper: a particular class of animals should not be studied for its own sake. In the case of the Pinnipeds (seals, sea lions, fur seals and walruses) the organism and the problem are essentially the same. The research questions presented in this volume in one way or another relate to survival in two worlds, the ocean for foraging, and the terrain at its edge or frozen above it for breeding. The evolution of Pinniped behaviour and the mechanisms which underlie it are a consequence of having to cope with two seemingly incompatible sets of environmental constraints. The physiological adaptations for concomitant functioning in two media with very different physical characteristics have produced correlated behav ioural modifications. The energetic demands of reproduction and foraging are idiosyncratic because each activity occurs on opposite sides of the air/water interface. As a result, the mating system must reconcile aquatic design for such functions as locomotion and thermoregulation, with the terrestrial requirements for successful pupping. Similarly, the ecology of this dual habitat prescribes the rules governing the behaviour of the neonate and its interactions with its mother.
Download or read book Dispersion and site fidelity of breeding male grey seals Halichoerus grypus on North Rona Scotland written by S.D. TWISS and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology of Puget Sound Marine Mammals and Marine Birds written by and published by . This book was released on 1985 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seals Fur Seals Sea Lions and Walrus written by IUCN/SSC Seal Specialist Group and published by . This book was released on 1993 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Birds of the St Croix River Valley written by Craig A. Faanes and published by . This book was released on 1981 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
