Download or read book Population Biology and Activity Patterns of Harbour Seals Phoca Vitulina in the Wadden Sea written by Edith Ries and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Biology and Activity Patterns of Harbour Seals Phoca Vitulina in the Wadden Sea written by Edith Helen Ries and published by . This book was released on 1999 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Distribution and Foraging Behaviour of Harbour Seals Phoca Vitulina in the Wadden Sea written by Laia Rojano Doñate and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Movement and habitat use are essential population processes fundamental for the management and conservation of animal species. Hence, the ability to track and infer specific animal behaviours are problems that have concerned scientists for many years. Technological advances have contributed to the improvement of tracking methods over the last century. Among them, ARGOS system has become an important tool for tracking animal movement globally, however it is limited to only providing geolocation. Therefore, it is still necessary to develop a methodology capable of inferring the behaviour of an animal using the available information. The inherent complexity of animal movements and limitations in tracking systems have made necessary to develop statistical methods able to cope with such constraints. Recently, State-Space models (SSMs) have been presented as an approach capable of integrating the treatment of both limitations. In this project, it is presented a two-stages method able to determine, from movement metrics, the distribution of the animals and, more specifically, the foraging behaviour of Danish Wadden Sea population of harbour seals. Firstly, this methodology handles ARGOS inaccuracy positioning and, secondly, assigns behavioural states to each location.. Despite of the improvement of technologies, it is always challenging to estimate the spatial distribution of wildlife, but it becomes even more complicated when referring to marine life. This project aim to satisfactory applies a State Space Models to deal with biological and statistical complexities and determine the geographical distribution of the animals and site fidelity in terms of haul-out and foraging positions.
Download or read book Feeding Ecology and Population Dynamics of the Harbour Seal Phoca Vitulina in Kattegat Skagerrak written by Tero Härkönen and published by . This book was released on 1987 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Management and Conservation on the Harbour Seal Phoca Vitulina Population in the International Wadden Sea Area written by Peter J. M. Reijnders and published by . This book was released on 1981 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activity Pattern in Particular Diving Behaviour of Harbour Seals Phoca Vitulina in the Dutch Wadden Sea During Autumn 1991 written by P. Paffen and published by . This book was released on 1992 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seals in Motion written by and published by . This book was released on 2017 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Harbour Seal Phoca Vitulina Population in the Dutch Wadden Sea Size and Composition written by Peter J. H. Reijnders and published by . This book was released on 1976 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2001 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Dynamics Behavior and the Effect of Disturbance on Haulout Patterns of the Harbor Seal Phoca Vitulina Richardsi Elkhorn Slough Monterey Bay California written by Leslie S. Osborn and published by . This book was released on 1985 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Causes of the Decrease in the Harbour Seal Phoca Vitulina Population in the Dutch Wadden Sea written by Peter Johannes Hubertus Reijnders and published by . This book was released on 1980 with total page 306 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 Foraging Ecology Diving Behavior and Migration Patterns of Harbor Seals Phoca Vitulina Richardii from a Glacial Fjord in Alaska in Relation to Prey Availability and Oceanographic Features written by Jamie Neil Womble and published by . This book was released on 2012 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the movement behavior and foraging strategies of individuals across multiple spatial and temporal scales is essential not only for understanding the biological requirements of individuals but also for linking individual strategies to population level effects. Glacial fjords scattered throughout south-central and southeastern Alaska host some of the largest seasonal aggregations of harbor seals (Phoca vitulina richardii) in the world, and an estimated 15% of the harbor seal population in Alaska is found seasonally at these glacial ice sites. Over the last two decades, the number of harbor seals has declined at two of the primary glacial fjords, in Aialik Bay in south-central Alaska and in Glacier Bay in southeastern Alaska, thus raising concerns regarding the viability of seal populations in glacial fjord environments. From 2004-2009, the foraging ecology, diving behavior, and migration patterns of harbor seals from Glacier Bay National Park, Alaska were examined in relation to prey availability and oceanographic features in Glacier Bay and the surrounding regions of southeastern Alaska. Time-depth recorders, very high frequency transmitters, and satellite-linked transmitters were used to quantify the vertical and horizontal movement patterns of harbor seals in the marine environment. Specifically, (1) I characterized the diving behavior, foraging areas, and foraging strategies of female harbor seals from terrestrial and glacial ice sites relative to prey availability during the breeding season (May-June) in Glacier Bay, (2) I quantified the intra-population variation in at-sea post-breeding season (September-April) distribution and movement patterns of female harbor seals in relation to oceanographic features, (3) I quantified the post-breeding season migration patterns of female harbor seals relative to the boundaries of the marine protected area of Glacier Bay National Park, and (4) I characterized the use of the continental shelf region of the eastern Gulf of Alaska by female harbor seals from Glacier Bay, both as a foraging area and as a migratory corridor in relation to oceanographic features. During the breeding season, there was a substantial degree of intra-population variation in the diving behavior and foraging areas of juvenile and adult female seals from glacial ice and terrestrial sites in Glacier Bay. The presence of multiple diving strategies suggests that differences in the relative density and depth of prey fields in glacial ice and terrestrial habitats in addition to seal age and reproductive status may influence diving and foraging behavior of harbor seals. During the post-breeding season, juvenile and adult female harbor seals ranged extensively beyond the boundaries of the marine protected area of Glacier Bay National Park, throughout the northern inshore waters of southeastern Alaska and the continental shelf region of the eastern Gulf of Alaska between Cross Sound and Prince William Sound, Alaska (up to 900 kilometers away). Seals exhibited a relatively high degree of intra-population variation in their at-sea post-breeding season distribution patterns that may be a function of extrinsic factors such as oceanographic characteristics, which can influence prey availability as well as intrinsic factors including previous experience with foraging areas and seal condition and age. Use of the continental shelf region of the eastern Gulf of Alaska by harbor seals as a foraging area may be due to enhanced biological productivity which may be associated with ephemeral hydrographic and/or static bathymetric features. Despite extensive migrations of seals from Glacier Bay during the post-breeding season, there was a high degree of inter-annual site fidelity of seals to Glacier Bay the following breeding season after seals were captured.
Download or read book Aquatic Mammals written by and published by . This book was released on 2001 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recruitment in the Harbour Seal Phoca Vitulina Population in the DutchWadden Sea written by Peter J. H. Reijnders and published by . This book was released on 1978 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Mammals Ashore written by Joseph R. Geraci and published by National Aquarium in Baltimore. This book was released on 2005 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive manual for understanding and carrying out marine mammal rescue activities for stranded seals, manatees, dolphins, whales, or sea otters.
Download or read book Ecology Abstracts written by and published by . This book was released on 1999 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.
