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Evaluation Of Alaska Harbor Seal Phoca Vitulina Population Surveys
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Book Synopsis Evaluation of Alaska Harbor Seal (Phoca Vitulina) Population Surveys by : Milo Douglas Adkinson
Download or read book Evaluation of Alaska Harbor Seal (Phoca Vitulina) Population Surveys written by Milo Douglas Adkinson and published by . This book was released on 2001 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines harbor seal population surveys in the portion of the Gulf of Alaska affected by the Exxon Valdez oil spill using computer simulation in order to evaluate alternative survey designs and effects of animal movement, variation in molt timing, inter-site trend variability, and other factors thought to affect the surveys.
Book Synopsis Harbor Seal (Phoca Vitulina) Biology and Management in Alaska by : A. Anne Hoover-Miller
Download or read book Harbor Seal (Phoca Vitulina) Biology and Management in Alaska written by A. Anne Hoover-Miller and published by . This book was released on 1994 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alaska Harbor Seal Research Plan 2000 by : United States. National Marine Fisheries Service
Download or read book Alaska Harbor Seal Research Plan 2000 written by United States. National Marine Fisheries Service and published by . This book was released on 2000 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines statewide harbor seal population abundance estimation, stock identification, trends in abundance, general biology and life history, and human interactions.
Download or read book Status Review written by John L. Sease and published by . This book was released on 1992 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Status Review by : Alaska Fisheries Science Center Nationa
Download or read book Status Review written by Alaska Fisheries Science Center Nationa and published by BiblioGov. This book was released on 2013-06 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1970's the National Oceanic and Atmospheric Administration (NOAA) was made to manage our oceanic and atmospheric resources. The Alaska Fisheries Science Center is the research branch for marine life and coastal oceans off parts of the U.S. west coast and Alaska. This includes the Eastern Bering Sea where some the worlds most important commercial fishing takes place. Their mission is to develop and maintain scientific exploration to help understand and manage that region's environment. Over the years there have been many reports published which discuss their findings; this is one of them.
Book Synopsis Geneflow and Diet for Two Declining Harbor Seal (Phoca Vitulina) Populations in Alaska by : Jason K. Herreman
Download or read book Geneflow and Diet for Two Declining Harbor Seal (Phoca Vitulina) Populations in Alaska written by Jason K. Herreman and published by ProQuest. This book was released on 2007 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 2012 Population Estimate for the Harbor Seal (Phoca Vitulina Concolor) in New England Waters by : Gordon T. Waring
Download or read book 2012 Population Estimate for the Harbor Seal (Phoca Vitulina Concolor) in New England Waters written by Gordon T. Waring and published by . This book was released on 2015 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This survey was conducted to obtain an abundance estimate for the New England harbor seal (Phoca vitulina concolor) population, as the previous estimate (2001) was outdated for stock assessment purposes. Aerial photographic surveys and radio tracking of harbor seals on ledges along the Maine coast were conducted during the pupping period in late May 2012. Twenty-nine harbor seals (20 adults and 9 juveniles) were captured and radio-tagged prior to the aerial survey. Of these, 18 animals (6 adult males, 6 adult females, 2 juvenile males and 4 juvenile females) were available during the survey to develop a correction factor for the fraction of seals not observed. The estimate of harbor seal abundance in 2012 was 75,834 (11,625 standard deviation [sd]; 0.153 coefficient of variation [CV]). Nmin, the lower 20% confidence limit, was 66,884. The 2012 point estimate is 24% lower than the 99,340 reported for 2001. Possible reasons for the lower estimate include changes in survey design, differences in the age/sex ratio of radio-tagged seals available for obtaining a correction factor, differences in harbor seal distribution between 2001 and 2012, and/or that the population has actually declined. [doi:10.7289/V5ZC80VT (http://dx.doi.org/10.7289/V5ZC80VT)]
Book Synopsis Survey Designs for Assessment of Harbor Porpoise and Harbor Seal Populations in Oregon, Washington, and Alaska by : Alaska Fisheries Science Center Nationa
Download or read book Survey Designs for Assessment of Harbor Porpoise and Harbor Seal Populations in Oregon, Washington, and Alaska written by Alaska Fisheries Science Center Nationa and published by BiblioGov. This book was released on 2013-06 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1970's the National Oceanic and Atmospheric Administration (NOAA) was made to manage our oceanic and atmospheric resources. The Alaska Fisheries Science Center is the research branch for marine life and coastal oceans off parts of the U.S. west coast and Alaska. This includes the Eastern Bering Sea where some the worlds most important commercial fishing takes place. Their mission is to develop and maintain scientific exploration to help understand and manage that region's environment. Over the years there have been many reports published which discuss their findings; this is one of them.
Book Synopsis Assessment of the Reproductive Ecology of Harbor Seals (Phoca Vitulina) and Northern Sea Otters (Enhydra Lutris Kenyoni) in Alaska Using Subsistence Biosampling Programs by : Emily A. Hutchinson
Download or read book Assessment of the Reproductive Ecology of Harbor Seals (Phoca Vitulina) and Northern Sea Otters (Enhydra Lutris Kenyoni) in Alaska Using Subsistence Biosampling Programs written by Emily A. Hutchinson and published by . This book was released on 2014 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harbor seals (Phoca vitulina) and northern sea otters (Enhydra lutris kenyoni) in Alaska have experienced extreme fluctuations in abundance in recent decades. The purpose of this study was to examine growth and determine the age and size at sexual maturity in populations of these two species, as spatial and temporal variations in environmental conditions and changes in ecological constraints as a result of population fluctuations can influence growth and reproductive characteristics of individuals. All samples for this research were collected via biosampling, the collection of measurements and biological tissue samples, as a component of subsistence harvesting by Alaska Natives. In Chapter 1, morphometric measurements and reproductive tracts were collected by the Alaska Native Harbor Seal Commission's Biosampling Program from female harbor seals harvested throughout the Gulf of Alaska from 1998 through 2005. Seals attained an asymptotic standard length (SE) of 147.7 ± 2.6 cm and body mass of 82.2 ± 4.8 kg. Female harbor seals did not mature until a minimum age of 3 yr, a standard length of 122 cm, and a weight of 48 kg. The average age of sexual maturity was 4.2 ± 0.7 yr (95% CI). Fetal growth was measured by standard length, curvilinear length, axillary girth, the cube root of fetal mass, skull length, condylobasal length, zygomatic width, and skull width against the day of the year the mother was harvested. The x-intercept of the linear regression of each fetal growth measurement against the day of the year produced estimates of the implantation date that ranged from September 22nd to October 17th, with a mean date of September 30th ± 8 d (SD). Harbor seals from this study are smaller in length, have a later implantation date, and are larger at sexual maturity compared to harbor seals in the Gulf of Alaska from the 1960s. In Chapter 2, morphometric measurements and reproductive tracts were collected by a Native Alaskan subsistence hunter from 40 male sea otters near Gustavus, in Southeast Alaska. The maximum recorded standard length and axillary girth were 160 cm and 78.7 cm, respectively. Sexual maturity was assessed by the histological examination of the testes and epididymides and the subsequent measurement and characterization of the seminiferous tubules. Male sea otters in the region reached sexual maturity at 3 to 4 yr of age, after attaining a standard body length of 130 cm., a mean seminiferous tubule diameter of 140 μm, and a baculum length of 14 cm. Sea otters outside Gustavus, Alaska exhibit increased body size and lower ages of sexual maturity compared to sea otters in other regions of Alaska, suggesting that resources are abundant and are not limiting maturation rates of male sea otters near Glacier Bay. In the future, as anthropogenic influences continue to increase and environmental conditions fluctuate, biosampling programs will be an invaluable tool for continued monitoring of marine mammals in Alaska.
Book Synopsis Harbor Seal (Phoca Vitulina Richardii) Distribution and Abundance in the Bering Sea by : Robert D. Everitt
Download or read book Harbor Seal (Phoca Vitulina Richardii) Distribution and Abundance in the Bering Sea written by Robert D. Everitt and published by . This book was released on 1979 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Between June 1975 and July 1977 six aerial surveys were conducted along the eastern Aleutian Islands and northern Alaska Peninsula to determine the seasonal distribution and abundance of the land breeding harbor seal ... as part of the Alaska Outer Continental Shelf Environmental Assessment Program ..."--Page 389.
Book Synopsis Assessing the Health of Harbor Seals in Alaska by : Stephen John Trumble
Download or read book Assessing the Health of Harbor Seals in Alaska written by Stephen John Trumble and published by . This book was released on 2003 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Declining populations of pinnipeds in the Gulf of Alaska, possibly resulting from changes in prey quality, prompted research to determine the population health status of harbor seals (Phoca vitulina) using blood chemistry and digestive constraints. Blood chemistry and morphology reference range values between two harbor seal pup populations in Alaska, one population in continued decline, Prince William Sound, and another in recent increase, Tugidak Island, offered clues that blood values can vary on the population scale and that health assessment must utilize an appropriate set of reference values for valid comparisons. Subsequently, a captive study involving harbor seals yielded changes in ten blood chemistry or hematology values as a function of season and diet. These data provided evidence that populations may have distinct "identities" based on blood chemistry values. The "metabolic identity" of a population provides evidence of the relationship between environmental stressors and the genetic capacity of the animal to respond to metabolic demands. This made it possible to better understand population level differentiation in plasma chemistry values and thus assess the health of animals occupying the outlier regions of populations, since these regions are often suggestive of poor health. A captive study involving harbor seals, which are known to consume the low quality prey (pollock) implicated in the declines of many species of birds and mammals in the Gulf of Alaska, yielded consistent dry matter digestibility resulting in greater gut fill from pollock than from herring. Digestible energy intakes from pollock were greater than from either herring or the mixed diet. Lipid digestibility of herring declined from 90% to 50% when lipid intake exceeded 60 g kg −07̇5 d−1. Results of this study imply that a flexible digestive system for harbor seals can compensate for ingesting a prey of low energy density by increasing gut fill and enhancing protein and lipid assimilation, to sustain digestible energy intake. In other words, harbor seals can offset differences in prey quality if prey availability and abundance does not limit the physiological plasticity of their digestive system to maintain their supply of energy and nutrients"--Leaves iii-iv.
Book Synopsis Marine Mammal Assessment Program by : National Marine Mammal Laboratory (U.S.)
Download or read book Marine Mammal Assessment Program written by National Marine Mammal Laboratory (U.S.) and published by . This book was released on 1993 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Behavior and Population Dynamics by : Jim M. Cushing
Download or read book Modeling Behavior and Population Dynamics written by Jim M. Cushing and published by Springer Nature. This book was released on 2024-01-28 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph summarizes several decades of collaborations between ecologists and mathematicians, presenting novel applications in biological modeling. The authors are among the first researchers to pioneer the use of dynamical systems models to successfully describe and predict animal behavior in relation to environmental changes. The text highlights the biological and mathematical techniques used in the research, including three main components: 1) large data sets on natural populations in the field; 2) mathematical models rigorously tied to data, which describe, explain, and predict behavioral dynamics in relation to environmental variables; and 3) simplified, proof-of-concept models to probe dynamic mechanisms, suggest testable hypotheses, and allow study of the consequences of environmental change and evolving traits. It is a suitable text for field ecologists interested in the modeling procedures and conclusions addressed therein, as well as mathematicians interested in applications to population, ecological, and evolutionary dynamics.
Book Synopsis Survey Designs for Assessment of Harbor Porpoise and Harbor Seal Populations in Oregon, Washington, and Alaska by : National Marine Mammal Laboratory (U.S.)
Download or read book Survey Designs for Assessment of Harbor Porpoise and Harbor Seal Populations in Oregon, Washington, and Alaska written by National Marine Mammal Laboratory (U.S.) and published by . This book was released on 1992 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biochemical Identification of Populations of the Harbor Seal, Phoca Vitulina by : Peter D. Shaughnessy
Download or read book Biochemical Identification of Populations of the Harbor Seal, Phoca Vitulina written by Peter D. Shaughnessy and published by . This book was released on 1974 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Fisheries Review written by and published by . This book was released on 2015 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seasonal Abundance, Distribution, and Ecology of the Harbor Seal, Phoca Vitulina Richardsi, on San Miguel Island, California by : Brent S Stewart
Download or read book Seasonal Abundance, Distribution, and Ecology of the Harbor Seal, Phoca Vitulina Richardsi, on San Miguel Island, California written by Brent S Stewart and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
