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Author : Thomas G. Smith
Publisher : Unknown
Page : 110 pages
File Size : 55,9 Mb
Release : 1987
Category : Marine mammals
ISBN : COLUMBIA:CU12898295
Describes the biology and population ecology of the ringed seal, Phoca hispida, based on over 8,000 specimens and other data gathered in the Amundsen Gulf and southeastern Beaufort Sea.
Author : North Atlantic Marine Mammal Commission
Publisher : Tromsø [Norway] : North Atlantic Marine Mammal Commission
Page : 284 pages
File Size : 42,8 Mb
Release : 1998
Category : Ringed seal
ISBN : UCSD:31822027854496
Author : Daniel P. Costa,Elizabeth A. McHuron
Publisher : Springer Nature
Page : 651 pages
File Size : 55,9 Mb
Release : 2022-03-17
Category : Science
ISBN : 9783030889234
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.
Author : A. Schytte Blix,L. Walløe,Ø. Ulltang
Publisher : Elsevier
Page : 717 pages
File Size : 47,5 Mb
Release : 1995-10-06
Category : Technology & Engineering
ISBN : 0080543790
This volume outlines the major findings from the Norwegian research programme on whales and seals in Norwegian waters. A wide range of topics are covered, including physiological aspects, social organization, population dynamics, stock assessment and management. The book will be of great value to scientists and managers, as well as to members of the general public interested in environmental issues.
Author : Anita L. Lopez,Robyn P. Angliss
Publisher : Unknown
Page : 132 pages
File Size : 44,5 Mb
Release : 2001
Category : Endangered species
ISBN : UCSD:31822033850165
Author : Hajo Eicken,Maya Salganek
Publisher : University of Alaska Press
Page : 590 pages
File Size : 54,6 Mb
Release : 2010-03-15
Category : Science
ISBN : 9781602231078
As much as one-tenth of the world’s oceans are covered with sea ice, or frozen ocean water, at some point during the annual cycle. Sea ice thus plays an important, often defining, role in the natural environment and the global climate system. This book is a global look at the changes in sea ice and the tools and techniques used to measure and record those changes. The first comprehensive research done on sea-ice field techniques, this volume will be indispensable for the study of northern sea ice and a must-have for scientists in the field of climate change research.
Author : D. Renouf
Publisher : Springer Science & Business Media
Page : 424 pages
File Size : 40,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401131001
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.
Author : G.-R. Walther,Conradin A. Burga,P.J. Edwards
Publisher : Springer Science & Business Media
Page : 329 pages
File Size : 42,5 Mb
Release : 2012-11-09
Category : Science
ISBN : 9781441986924
In recent years an increasing number of studies have been published reporting observations of adapted behaviour and shifting species ranges of plant and animal species due to recent climate warming. Are these `fingerprints' of climate change? An international conference was organised to bring together scientists from different continents with different expertise but sharing the same issue of climate change impact studies. Ecologists, zoologists, and botanists exchanged and discussed the findings from their individual field of research. The present book is an international collection of biological signs of recent climate warming, neither based only on computer models nor on prediction for the future, but mainly on actually occurring changes in the biosphere such as adapted behaviour or shifts in the ranges of species. `Fingerprints' of Climate Change presents ecological evidence that organisms are responding to recent global warming. The observed changes may foreshadow the types of impacts likely to become more frequent and widespread with continued warming.
Author : Sarah J. Woodin,Mick Marquiss
Publisher : Cambridge University Press
Page : 304 pages
File Size : 45,9 Mb
Release : 1997-08
Category : Nature
ISBN : 052183998X
Once thought of as a pristine environment, it is now all too apparent that the Arctic is a sink for pollutants transported northwards over long distances in the atmosphere and oceans, and is also likely to be subject to major climate change as a result of global warming. Many ecologists are currently seeking to further our understanding of how arctic ecosystems function, and to detect and predict anthropogenic changes which may occur within them. This book, resulting from a British Ecological Society Special Symposium, addresses these issues.
Author : Ian Stirling,Ralph Archibald,Douglas P. DeMaster,Beaufort Sea Project (Canada)
Publisher : Unknown
Page : 78 pages
File Size : 40,7 Mb
Release : 1975
Category : Bearded seal
ISBN : UCSD:31822033836032
Report providing baseline information, collected in 1974, on the biology, distribution and abundance of ringed (Phoca hispida) and bearded (Erignathus barbatus) seals in the eastern Beaufort Sea.
Author : Steven H. Ferguson,Lisa L. Loseto,Mark L. Mallory
Publisher : Springer Science & Business Media
Page : 308 pages
File Size : 43,8 Mb
Release : 2010-05-30
Category : Science
ISBN : 9789048191215
In Arctic Canada, Hudson Bay is a site of great exploration history, aboriginal culture, and a vast marine wilderness supporting large populations of marine mammals and birds. These include some of the most iconic Arctic animals like beluga, narwhal, bowhead whales, and polar bears. Due to the challenges of conducting field research in this region, some of the mysteries of where these animals move, and how they are able to survive in such seemingly inhospitable, ice-choked habitats are just now being unlocked. For example, are polar bears being replaced by killer whales? This new information could not be more salient, as the Hudson Bay Region is undergoing rapid environmental change due to global warming, as well as increased pressures from industrial development interests. A Little Less Arctic brings together some of the world’s leading Arctic scientists to present the current state of knowledge on the physical and biological characteristics of Hudson Bay.
Author : Anonim
Publisher : Unknown
Page : 544 pages
File Size : 47,6 Mb
Release : 2009
Category : Electronic
ISBN : NWU:35556038311197
Author : Anonim
Publisher : Unknown
Page : 370 pages
File Size : 41,9 Mb
Release : 2007
Category : Electronic
ISBN : NWU:35556037536448
Author : Anonim
Publisher : Unknown
Page : 900 pages
File Size : 48,6 Mb
Release : 2001
Category : Electronic
ISBN : NWU:35556033424706
Author : Anita L. Lopez,Douglas P. DeMaster
Publisher : Unknown
Page : 214 pages
File Size : 54,5 Mb
Release : 2000
Category : Endangered species
ISBN : UCSD:31822033850108
The National Marine Fisheries Service (l\rNßS) conducted an aerial survey of the beluga whale population in Cook Inlet, Alaska, during 8-14 June 1999. The 41.5 hr surveywas flown in a twin-engine, high-wing aircraft at an altitude of 244 m (800 ft) and speed of 185 km/hr (100 kt) along a trackline 1.4 km from shore, consistent with annual surveys flown each year since 1993. The flights in 1999 included one or more surveys of coastal areas around nearly the entire Inlet and 1,790 km oftransects across the Inlet. Paired, independent observers searched on the coastal (left) side of the plane, where virtually all sightings occur, while a single observer and a computer operatorldatarecorder were on the right side. In addition, each day a different visitor observed from the left side. After finding beluga groups, a series of aerial passes were made to allow at least two pairs of primary observers to make four or more counts of each group. Inter-day counts ranged from 75 to160 belugas near the Susitna River (between the Beluga and Little Susitna Rivers), 13 to 43 in Knik Arm, and 17 to 30 in Chickaloon Bay, but no belugas were found in lower Cook Inlet. The sum of the aerial estimates (using median counts from each site, not corrected for missed whales) ranged from 197 to 221 whales, depending on observer. The index count for 1999 is 217 , which is slightly higher than the index counts for 1998 (193) but lower than all index counts by NMFS observers between 1993-97