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Early Lactation And Attendance Behavior Of The Guadalupe Fur Seal Females Arctocephalus Townsendi
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Book Synopsis Early Lactation and Attendance Behavior of the Guadalupe Fur Seal Females, (Arctocephalus Townsendi) by : Ana Luisa Figueroa Carranza
Download or read book Early Lactation and Attendance Behavior of the Guadalupe Fur Seal Females, (Arctocephalus Townsendi) written by Ana Luisa Figueroa Carranza and published by . This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior and Ecology of the Northern Fur Seal by : Roger L. Gentry
Download or read book Behavior and Ecology of the Northern Fur Seal written by Roger L. Gentry and published by Princeton University Press. This book was released on 2014-07-14 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the behavior and ecology of the northern fur seal, this book is a model long-term study of marine mammals, one that tests theory through both observation of undisturbed behavior and manipulative experiments on individuals. Here Roger Gentry draws on nearly two decades of research on three different islands to show how behavior among these seals changes with population size, sex ratio, and environment, to explain the behavior of the population beginning with individuals, and to generalize the results to other members of the eared seal family. In so doing, he offers one of the most comprehensive studies of its kind on any marine mammal species to date. Gentry shows that the species is driven by very different behavioral traits than have been assumed for it in the past. His book analyzes behavior on scales of hours to lifetimes, investigates the mating system, considers processes that underlie the mating system (site fidelity, behavioral estrus, and the development of territoriality), and addresses specific aspects of maternal strategy (female attendance behavior, pup growth, seasonal influences, and the effects of continental shelf width). Gentry contributes to knowledge about marine mammals by providing a very specific basis for interspecies comparisons, and he suggests a link between population trend and environmental regime shifts. He also guides the debate over seal mating systems from an interpretive to an empirical or experimental basis. Originally published in 1997. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Lactation in Farm Animals written by and published by BoD – Books on Demand. This book was released on 2020-01-22 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greater knowledge of lactation allows us to alter environmental, nutritional, and milking procedures, or general management to maximize production. This book, focusing on lactation in farm animals (biology, physiological basis, nutritional requirements, and modelization), presents invited papers from internationally recognized scientists. This volume contains seven chapters covering the key topics related to milk production and lactation biology and physiology. The authors show that animals raised on a well-controlled nutrition regimen may have significant enhancement of succeeding lactations. Furthermore, the usefulness of a milk yield prediction system depends upon how accurately it can predict daily milking patterns and its ability to adjust to factors affecting supply. Milk yield prediction models have proven helpful for genetic analysis and for bio-economic modeling. On the whole, this book serves as an inspirational basis for both scientists and farmers.
Book Synopsis Northern Fur Seal Lactation, Attendance and Reproductive Success in Two Years of Contrasting Oceanography by : Michael E. Goebel
Download or read book Northern Fur Seal Lactation, Attendance and Reproductive Success in Two Years of Contrasting Oceanography written by Michael E. Goebel and published by . This book was released on 2002 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecology and Conservation of Pinnipeds in Latin America by : Gisela Heckel
Download or read book Ecology and Conservation of Pinnipeds in Latin America written by Gisela Heckel and published by Springer Nature. This book was released on 2021-03-28 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pinnipeds are marine mammals that include eared seals, true seals, and walruses. This book presents detailed reviews on the ecology and conservation of 10 pinniped species along the coasts and islands in Latin America, from Mexico to Chile and Argentina. Topics covered include their population dynamics, trophic ecology, reproduction, and behavior. In addition, the book addresses major conservation issues regarding climate change, interaction with fisheries, ecotourism, and other human activities.
Book Synopsis A Study of the Population Dynamics and Breeding Behavior of the Guadalupe Fur Seal, Arctocephalus Townsendi by : Mark Owen Pierson
Download or read book A Study of the Population Dynamics and Breeding Behavior of the Guadalupe Fur Seal, Arctocephalus Townsendi written by Mark Owen Pierson and published by . This book was released on 1978 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Marine Mammals by : Randall W. Davis
Download or read book Marine Mammals written by Randall W. Davis and published by Springer Nature. This book was released on 2019-11-14 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book provides new insights into the morphological, metabolic, thermoregulatory, locomotory, diving, sensory, feeding, and sleep adaptations of Cetacea (whales and dolphins), Pinnipedia (seals, sea lions and walrus), Sirenia (manatees and dugongs) and sea otters for an aquatic life. Each chapter reviews the discoveries from previous studies and integrates recent research using new techniques and technology. Readers will gain an understanding of the remarkable adaptations that enable marine mammals to spend all or most of their lives at sea, often while hunting prey at depth.
Book Synopsis Factors Affecting the Population Status of Guadalupe Fur Seal, Arctocephalus Townsendi (Merriam, 1897), at Isla de Guadalupe, Baja California, Mexico by : Juan Pablo Gallo Reynoso
Download or read book Factors Affecting the Population Status of Guadalupe Fur Seal, Arctocephalus Townsendi (Merriam, 1897), at Isla de Guadalupe, Baja California, Mexico written by Juan Pablo Gallo Reynoso and published by . This book was released on 1994 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Perspectives on the Biology and Life History of the White Shark by : Michael L. Domeier
Download or read book Global Perspectives on the Biology and Life History of the White Shark written by Michael L. Domeier and published by CRC Press. This book was released on 2012-02-03 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by the International White Shark Symposium in 2010, Global Perspectives on the Biology and Life History of the White Shark incorporates the most important contemporary research findings into a single peer-reviewed book. This beautifully illustrated reference represents a historic change in the context of White Shark (Carcharodon carcharias
Download or read book Fur Seals written by Roger L. Gentry and published by Princeton University Press. This book was released on 2014-07-14 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributors to this volume have accomplished a breakthrough in our ability to collect data on ocean-dwelling mammals. In the first large-scale comparison of fur seals, they have employed quantitative methods and a special instrument called a Time-Depth-Recorder to study the strategies used by females in six species of cared seals to rear and wean their young in different environments. Originally published in 1986. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Book Synopsis Guadalupe Fur Seal, Status Review by :
Download or read book Guadalupe Fur Seal, Status Review written by and published by . This book was released on 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Mammals written by and published by . This book was released on 2000 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energetics and Development of Northern Fur Seal, Callorhinus Ursinus Pups by : Mary Jill Donohue
Download or read book Energetics and Development of Northern Fur Seal, Callorhinus Ursinus Pups written by Mary Jill Donohue and published by . This book was released on 1998 with total page 390 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 1998 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Distribution, Abundance, and Population Characteristics of the Guadalupe Fur Seal, Arctocephalus Townsendi (Merriam 1897) by : Luis Armando Fleischer
Download or read book The Distribution, Abundance, and Population Characteristics of the Guadalupe Fur Seal, Arctocephalus Townsendi (Merriam 1897) written by Luis Armando Fleischer and published by . This book was released on 1978 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Abstracts, Eleventh Biennial Conference on the Biology of Marine Mammals by :
Download or read book Abstracts, Eleventh Biennial Conference on the Biology of Marine Mammals written by and published by . This book was released on 1996 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Northern Fur Seal Reproductive Rates and Early Maternal Care by : Erin Kunisch
Download or read book Northern Fur Seal Reproductive Rates and Early Maternal Care written by Erin Kunisch and published by . This book was released on 2011 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The majority of the world's breeding population of northern fur seals (Callorhinus ursinus) is found on the Pribilof Islands (St. Paul and St. George) in the Bering Sea, Alaska. Pup production on these islands experienced an irregular but overall decline since the early 1970's. Between 1998 and 2010, pup production declined precipitously at an annual rate of 4.9% on the Pribilof Islands, and 5.5% on St. Paul Island. Specific reasons for this decline remain unknown, and contemporary estimates for many vital rate parameters including reproductive rates are unavailable. This study determined a contemporary estimate of natality and fertility rates, as well as reproductive timing on the Polovina Cliffs rookery of St. Paul Island during the 2008 (30 June-31 August) and 2009 (1 July-25 August) breeding seasons. Natality rate (defined as the number of pups born divided by the number of reproductively mature females) was determined from visual observations of parturition or associated maternal behavior in 208 and 217 individually marked females (via flipper tags) in 2008 and 2009, respectively. Data yielded observed natality estimates of 0.79 in 2008 and 0.88 in 2009. The fertility rate (defined as the number of pups born divided by the total number of females present, irrespective of reproductive maturity/age) was determined for the 2008 breeding season only. This ratio of total pup to female counts was derived from adjusted daily cross-sectional counts conducted through the breeding season. Maximum pup and female counts were derived as asymptotes of sigmoid growth models fitted to corrected daily counts. Live pup counts were corrected for mortalities by estimates of cumulative pup mortalities. Daily counts of females present in the rookery were corrected for reduced detection probabilities resulting from increased maternal foraging trip durations through the season, typical of attendance patterns associated with colonial, income breeders. Daily detection probabilities for individually marked females were generated from Cormack-Jolly-Seber (CJS) open population models using maximum likelihood estimators (MLE) in Program MARK. Multiple a priori models accounting for the effects of possible covariates on detection probabilities were evaluated in an information-theoretic approach using Akaike's Information Criterion (AIC) and AICc model weights. Data yielded a minimum fertility rate estimate of 0.60 in 2008. Detection probabilities derived from the top CJS model for dual flipper-tagged females only were used to adjust the daily cross-section counts of all (marked and unmarked) females. Therefore, the actual fertility rate is probably higher than the estimate presented here, which should be regarded as the lowest likely value for 2008. However, AICc model weights also demonstrated the absence of density effects on detection probability estimates. This supports the applicability of marked female-based detection probabilities for correcting cross-sectional counts of all females and further suggests that the actual fertility estimate likely does not differ much from the presented estimate. Median dates of birth were calculated as the date closest to 50% of modeled corrected pup count asymptotes, yielding median dates of 17 July in 2008 and 15 July in 2009. Pregnant females are highly consistent in their arrival dates, with parturition occurring approximately 1 day after arrival. Median observed dates of arrival from individually marked females resulted in dates of 16 July in 2008 and 15 July in 2009. These dates occurred 5 to 13 days later than historic reports from 1951 through 1995. With median arrival dates 1 day prior to parturition, the observed match between birth dates derived from pup counts and from observed arrival dates of marked females supports the finding of a contemporary delay in the timing of parturition. Median arrival derived as the date closest to 50% of the asymptote from corrected and modeled female counts yielded 13 July in 2008. This earlier data is likely an effect of the inclusion of immature and nulli-parous females. In a subset of 62 females with pregnancy confirmed through a trans-rectal ultrasonography procedure in November 2007 and 29 females in 2008, the return rate for the following reproductive season was 0.92 and 0.76, respectively. In 2008, the return and natality rate was measured by radiotelemetry data, detected from females outfitted with VHF-radio transmitter. In 2009 both rates were determined by observational data. Observed natality rates for returned females of a known pregnancy status were 0.95 in 2008 and 0.96 in 2009. Radiotelemetry data from 76 females was analyzed for early maternal attendance patterns (duration and ratio of presences and absences) in 2008. The mean date of detected return was 18 July. The mean duration of the perinatal period was 7.5 days (+/- 1.3 SD). Excluding the perinatal period, the mean duration of presence on shore for the first five visits was 1.47 days (+/- 0.21 SD). The mean duration of absence at sea for the first five trips was 7.07 days (+/- 0.42 SD). Results presented from this study do not provide any direct evidence of a contemporary reduction in natality or fertility rates in northern fur seals. Since observed rates were comparably high and consistent between 2008 and 2009, it is unlikely that reduced natality rates are contributing to the current population trajectory. Attendance patterns do not provide any evidence of increased maternal foraging effort or secondarily, reduced prey availability. Interestingly, median pupping dates were found to occur significantly later than historical estimates. Potential reasons for this shift could be an increase in younger females within the reproductive female population at this rookery, or a shift in the timing of ocean climate conditions and peak prey availability during the breeding season.
