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Saturday, July 25, 2020 | History

2 edition of Population evaluation of the harbor seal (P̀hoca vitulina richardi)́ in the waters of the State of Washington found in the catalog.

Population evaluation of the harbor seal (P̀hoca vitulina richardi)́ in the waters of the State of Washington

Population evaluation of the harbor seal (P̀hoca vitulina richardi)́ in the waters of the State of Washington

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Published by Marine Mammal Commission in [Washington, D.C .
Written in English

    Subjects:
  • Harbor seal -- Washington (State).

  • Edition Notes

    Statementby Murray L. Johnson and Steven J. Jeffries.
    ContributionsJohnson, Murray L., Jeffries, Steven J., United States Marine Mammal Commission.
    The Physical Object
    FormatMicroform
    Paginationiv, 27 p.
    Number of Pages27
    ID Numbers
    Open LibraryOL15572977M

      The once-thriving New England gray seal population was decimated by the midth century because of hunting, with Massachusetts keeping a seal bounty on the books until the s. Instrument Deployment. Adult harbor seals were captured from April–May of and from November –February following the methods of Jeffries et capture, weight to the nearest kg and straight length ±5 cm was measured, blood and blubber biopsies were taken, and time-depth recorders (TDRs; Wildlife Computers, Redmond, WA, Mk-9, or MkF) were attached to each seal.

    & Hammill, ), while gray seal populations in the United States continue to increase (Waring et al., ), likely representing a pop-ulation size-mediated range expansion from Canadian source pop-ulations (Wood et al., ). Following protection, the harbor seal population in the Northeast United States also experienced steady. The increasing seal population and greatly improved water quality in Narragansett Bay resulted in harbor seals returning to the bay in the 's. The bay-wide population of wintering harbor seals is likely between to seals, at 15 to 20 regular haul-out sites.

      • Additional years of Harbor Seal population estimates to increase confidence in carrying capacity • Additional years of seal diet from other locations to understand temporal and spatial variability in Seal diet • Estimates of adult fish consumption • Better diet information for California and Steller sea lions From to the harbor seal population grew by more than 27% and reached almost , individuals. However, the most recent survey, conducted in .


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Population evaluation of the harbor seal (P̀hoca vitulina richardi)́ in the waters of the State of Washington Download PDF EPUB FB2

Harbor seal pups can swim at birth. They can also dive for up to 2 minutes when they are only 2 to 3 days old. Mother harbor seals raise their pups in nurseries—groups of mothers and their young—that help protect the seals from predators.

The harbor seal’s diet. The harbor (or harbour) seal (Phoca vitulina), also known as the common seal, is a true seal found along temperate and Arctic marine coastlines of the Northern most widely distributed species of pinniped (walruses, eared seals, and true seals), they are found in coastal waters of the northern Atlantic, Pacific Oceans, Baltic and North : Phocidae.

Declining seal population in Glacier Bay. Declines of harbor seals in Glacier Bay are of concern for several reasons. First, harbor seals likely play an important role in structuring marine communities both as a consumer (e.g., Ward et al.

) and also as prey for other upper-trophic level species, such as transient killer whales (Orcinus orcas) (Williams et al. evaluation of the alaska harbor seal (phoca vitulina) population survey: a simulation study Milo D. Adkison Juneau Center, School of Fisheries and Ocean Cited by: Harbor seals inhabit shallow areas of estuaries, rivers, and places where sandbars and beaches are uncovered at low tide.

Migration. Harbor seals do not migrate regularly but will travel in search of feeding grounds. Population. Scientists estimate that the world harbor seal population currently is betweenandseals.

According to Gelman and Rubin’s test (Gelman & Rubin, ), convergence in the MSVAR estimations of the effective size occurred af iterations; and run 4 was the best supported Appendix results from MSVAR suggested that the effective size of the Moray Firth harbour seal population during our study period (–) was –1, (No) (sd 2,), and that the.

Jeffries, S.J., and Johnson, M.A. Population status and condition of the harbor seal Phoca vitulina richardsi in the waters of the state of Washington: – Final report to Marine Mammal Commission, University of Puget Sound, Tacoma, Wash.

Google Scholar. Thus, at the population levels ofJeffries et al. () estimated that Washington State harbor seal populations could withstand significant declines and still be within the Optimum Sustainable Population levels.

The population count continues to be the most recent estimate of Washington harbor seal abundances (Carretta et al.

Inresearchers counted six seal pups on a particular island. On that same island inthey counted 2, Exact overall population numbers aren’t known, but the National Marine Fisheries Service estimates that there are aro seals.

That’s nearly three times what there was in. Established inthe IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.

Columbia, compared with a population that had been reduced to perh when the first surveys were conduced in the early s. The B.C. population represents about 29% of the total ofharbour seals estimated to inhabit the NE Pacific Ocean. Recovery of harbour seal.

Harbor Seal Facts At A Glance. Other Name(s): Common seal Scientific name: Phoca vitulina Type of Animal: Mammal Animal Family: Phocidae (the true seal / earless seal family) Where Found: Coastal waters of the Northern Hemisphere Length Male: 6 to m ( to ft.); Female: to m ( to ft.) Weight Male: 70 to kg ( to lb.); Female: 60 to kg ( to lb.).

Resources Scientific Evaluation of the Distinctness of Harbor Seals (Phoca vitulina) in Iliamna Lake. Febru Review of relevant background information about harbor seal biology and scientific and local traditional knowledge specific to harbor seals in Iliamna Lake and nearby marine areas.

1. Introduction. Phocine herpesvirus-1 (PhHV-1) belongs to the subfamily Alphaherpesvirinae, genus Varicellovirus, and was first isolated from harbor seals (Phoca vitulina) housed in a seal recovery center in the Netherlands in (Maness et al.,Osterhaus et al., ).PhHV-1 infections are associated with high morbidity and mortality and regular outbreaks have.

Question: [P:+1 - [% This Problem Models A Harbor Seal Population, With Two Life Stages: Pups (P) And Adults (A). Consider The Discrete-time Model = M P] [A +1] Where M Is A Matrix With The Following Eigenvectors: (35). U = With Eigenvalue A1 = (20) 25 ū2 = With Eigenvalue Az = (a) (4 Points) What Is The Long Term Behavior Of The System, Regardless.

While tending their young, harbor seal mothers are very protective and will sometimes push the pup beneath the surface or carry it on her shoulders to avoid danger.

Harbor seals have been shown to dive as deep as meters; their average dive time is 2 minutes and the maximum dive time is 15 minutes (see Costa and Williams. total population of harbor seals in the Salish Sea is o The Salish Sea cov square kilometers of marine water (Gaydos et al.

), making the harbor seal density of almost 3 harbor seals per square kilometer of ocean possibly one of the most dense harbor seal populations in the world.

In the first half of the twentieth century, harbor seal (Phoca vitulina richardsi) numbers were severely reduced in Washington state by a state-financed population control program.

Seal numbers began to recover after the cessation of bounties in and passage of the Marine Mammal Protection Act (MMPA) in In the estimated population of harbor seals in Washington state was ab How can I identify harbor seals.

Harbor seals are found along the coasts, near river mouths, on island beaches, reefs and even inland. The coloring of harbor seal can range from silver to red with dark and light spots. Tags harbor seal, haul-out, mammal, coastal, Phoca vitulina, monitoring, population, biota, distribution, trend, abundance Summary The purpose of this project is to survey the abundance and distribution of harbor seals (Phoca vitulina richardsi) at all known haul-out sites in California coastal waters and offshore islands during the peak of the.

Harbor seals can be born as early as February in Baja California and as late as July in Europe. Mothers give birth to one pup after a gestation period of 10 1/2 to 11 months. The seal pups average feet ( centimeters) in length and weigh between about 22 .Harbor seals (Phoca vitulina) have the broadest distribution and inhabit the widest range of habitats of any other pinniped (Burns, ).Denizens of the coastal and continental shelf waters of the north Atlantic and Pacific oceans, harbor seals haul out on land or glacial ice floes to rest, breed, molt and nurse their young.It’s a sunny morning in early June, and the scene at Fish Pier in Chatham, Massachusetts, on the elbow of Cape Cod, is a perfect split-screen image of the Cape’s bipolar personality: On the upper deck, 40 or 50 tourists at a time line the rails, cooing and sighing every time a gray seal rises in the green water below and shows its glossy dark eyes.