Download or read book Mass Dynamics of Weddell Seals in Erebus Bay Antarctica written by Kelly Michelle Proffitt and published by . This book was released on 2008 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: An individual's body mass is an important life history trait that may vary with environmental conditions and be related to reproductive performance. In this dissertation, we used a 35-year dataset to investigate variations in body mass of Weddell seals (Leptonychotes weddellii) in Erebus Bay, Antarctica with goals of linking environmental conditions, body mass, and reproductive performance. We predicted that variations in environmental conditions and maternal traits would correlate with variations in maternal body mass at parturition, and that variations in maternal body mass may be linked with offspring's body mass and survival probability. We found maternal body mass at parturition showed substantial age- and environmental-related variations. Maternal body mass increased with age through the young and middle ages, and evidence of senescent declines in body mass was found amongst the oldest ages. Additionally, body mass at parturition was strongly influenced by environmental variations during the pregnancy period, specifically body mass was negatively correlated with sea-ice extent and positively correlated with the Southern Oscillation. Annually, pup weaning mass was highly variable. Pup weaning mass was negatively correlated with summer sea-ice extent and positively correlated with summer Southern Oscillation, and these two variables explained 86% of the annual variation in the population average weaning mass. Weaning mass was positively correlated with juvenile survival probability, particularly for males, and we estimated the odds of a male surviving from weaning to age 3 increased 7.3% for every 10 additional kilograms of body mass accrued by weaning. Together, these results suggest large-scale atmospheric-oceanographic variations may affect Weddell seal maternal foraging success and ultimately reproductive performance. Finally, we investigated statistical methodologies accounting for measurement error in photogrammetrically estimated body mass with goals of developing techniques to employ estimated body mass as a covariate in simple linear regression models. We demonstrated that error associated with estimating body mass induces bias in regression statistics and decreases model explanatory power and we described simple statistical techniques accounting for measurement error in covariates. These statistical developments may allow future studies to employ photogrammetric mass estimation techniques and utilize estimated body mass as a covariate in ecological modeling exercises.

Download or read book Weddell Seals written by Jeremy Schmidt and published by Weddell Seal Science. This book was released on 2023-10-06 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 50 years, the Weddell Seal Science project has been studying the world’s southernmost breeding mammal in its farthest-south location, McMurdo Sound, on the ice-bound edge of Antarctica. This book explores the life history of Weddell seals — surprisingly approachable big-eyed, smiling-faced creatures — and details the science of studying them: the techniques, the motivations, the objectives, and the results. Although science is at the heart of the book, this is also an adventure story about scientists living in a remote field camp, far out on the sea ice, surrounded by glaciers, where you can feel the ocean pulsing beneath your feet. Seals are all around, penguins walk through camp, the weather can be exquisitely beautiful or too severe to step outside. Simply being there would be a wonderful experience on its own but in this case the objective is science — a deeper understanding of our endlessly fascinating planet.

Download or read book Dynamics of a Weddell Seal Leptonychotes Weddellii Population in McMurdo Sound Antarctica written by Michael Foley Cameron and published by . This book was released on 2001 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Antarctica written by Gabrielle Walker and published by A&C Black. This book was released on 2012-03-01 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been many books about Antarctica in the past, but all have focused on only one aspect of the continent - its science, its wildlife, the heroic age of exploration, personal experiences or the sheer awesome beauty of the landscape, for example - but none has managed to capture whole story, till now. Gabrielle Walker, author, consultant to New Scientist and regular broadcaster with the BBC has written a book unlike any that has ever been written about the continent. Antarctica weaves all the significant threads into an intricate tapestry, made up of science, natural history, poetry, epic history, what it feels like to be there and why it draws so many different kinds of people back there again and again. It is only when all the parts come together that the underlying truths of the continent emerge. Antarctica is the most alien place on Earth, the only part of our planet where humans could never survive unaided. It is truly like walking on another planet. And yet, in its silence, its agelessness and its mysteries lie the secrets of our past, and of our future.

Download or read book Population dynamics of Weddell seals Leptonychotes weddelli in McMurdo Sound Antarctica written by J.W. TESTA and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Long Term Patterns in Life History Characteristics and Population Dynamics of Weddell Seals Leptonychotes Weddelli in McMurdo Sound Antarctica written by J. Ward Testa and published by . This book was released on 1987 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The population dynamics of Weddell seals in McMurdo Sound, Antarctica, were studied between 1970 and 1984 using various methods. This thesis is a synthesis of the results of that research.

Download or read book Response to Change in the Environment written by Samantha Elizabeth Lake and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population dynamics of the Weddell seal Leptonychotes weddelli in McMurdo Sound Antarctica 1966 1968 written by I. STIRLING 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 Long Term Patterns in Life History Characteristics and Population Dynamics of Weddell Seals Leptonychotes Weddelli in McMurdo Sound Antarctica written by James Ward Testa and published by . This book was released on 1989 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Dynamics of the Weddell Seal Leptonychotes Weddelli in McMurdo Sound Antarctica 1966 1968 written by Ian Stirling and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Antarctic Journal of the United States written by and published by . This book was released on 1996 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seals of the Blizzard written by Kim Westerskov and published by . This book was released on 1997 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces the physical characteristics, behaviour, life cycle and habitat of the Weddell Seal. Suggested level: primary, intermediate, junior secondary

Download or read book Male Reproductive Success Relatedness and the Mating System of Weddell Seals in Mcmurdo Sound Antarctica written by Thomas Scott Gelatt and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Cycles of Diving Behavior and Ecology of the Weddell Seal written by Michael Angelo Castellini and published by Univ of California Press. This book was released on 1992-01-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work details more than ten years of study in the Antarctic on the diving biology of Weddell seals, a species capable of diving over 600 meters and for as long as 82 minutes. The authors focus on seasonal diving patterns and geographical differences and discuss how diving patterns are influenced by the physical and ecological environment of the seals.

Download or read book Encyclopedia of Marine Mammals written by Bernd Würsig and published by Academic Press. This book was released on 2017-11-27 with total page 1190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Marine Mammals, Third Edition covers the ecology, behavior, conservation, evolution, form and function of whales, dolphins, seals, sea lions, manatees, dugongs, otters and polar bears. This edition provides new content on anthropogenic concerns, latest information on emerging threats such as ocean noise, and impacts of climate change. With authors and editors who are world experts, this new edition is a critical resource for all who are interested in marine mammals, especially upper level undergraduate and graduate students, researchers, and managers, and is a top reference for those in related fields, from oceanographers to environmental scientists. Significant content and topic updates, as well as the addition of new topics in such areas as anthropogenic disturbance Visual maps of the oceans and seas mentioned in contributions, helping to place the geographical features described in the text with clear, consistent species illustrations Written to help users learn new information or brush up on a topic quickly, with the references at the end of each entry to help guide readers into more specialist literature

Download or read book The diet of Weddell seals in McMurdo Sound Antarctica as determined from scat collections and stable isotopes written by J.M. BURNS and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Remote Sensing Technology and the Three Poles written by Manish Pandey and published by John Wiley & Sons. This book was released on 2022-12-12 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: ADVANCES IN REMOTE SENSING TECHNOLOGY AND THE THREE POLES Covers recent advances in remote sensing technology applied to the “Three Poles”, a concept encompassing the Arctic, Antarctica, and the Himalayas Advances in Remote Sensing Technology and the Three Poles is a multidisciplinary approach studying the lithosphere, hydrosphere (encompassing both limnosphere, and oceanosphere), atmosphere, biosphere, and anthroposphere, of the Arctic, the Antarctic and the Himalayas. The drastic effects of climate change on polar environments bring to the fore the often subtle links between climate change and processes in the hydrosphere, biosphere, and lithosphere, while unanswered questions of the polar regions will help plan and formulate future research projects. Sample topics covered in the work include: Terrestrial net primary production of the Arctic and modeling of Arctic landform evolution Glaciers and glacial environments, including a geological, geophysical, and geospatial survey of Himalayan glaciers Sea ice dynamics in the Antarctic region under a changing climate, the Quaternary geology and geomorphology of Antarctica Continuous satellite missions, data availability, and the nature of future satellite missions, including scientific data sharing policies in different countries Software, tools, models, and remote sensing technology for investigating polar and other environments For postgraduates and researchers working in remote sensing, photogrammetry, and landscape evolution modeling, Advances in Remote Sensing Technology and the Three Poles is a crucial resource for understanding current technological capabilities in the field along with the latest scientific research that has been conducted in polar areas.