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Friday, October 9, 2020 | History

2 edition of Productivity, survival, and population status of river otter in western Oregon found in the catalog.

Productivity, survival, and population status of river otter in western Oregon

James Eldon Tabor

Productivity, survival, and population status of river otter in western Oregon

by James Eldon Tabor

  • 320 Want to read
  • 28 Currently reading

Published .
Written in English

    Subjects:
  • Otters.

  • Edition Notes

    Statementby James Eldon Tabor.
    The Physical Object
    Pagination[10], 62 leaves, bound :
    Number of Pages62
    ID Numbers
    Open LibraryOL14239073M

    For southern sea otters to be considered for removal from threatened species listing, the population index would have to exceed 3, for three consecutive years, according to the threshold established under the Southern Sea Otter Recovery Plan by the U.S. Fish and Wildlife Service. The fundamental force behind population change is the balance between age-specific survival and reproductive rates. Thus, understanding population demographics is crucial when trying to interpret trends in population change over time. For many species, demographic rates change as the population’s status (i.e., relative to prey resources) varies.

    Sea Otter Population History in Washington State Sea otters have inhabited the northern coasts of the Pacific Ocean since the Pleistocene, about 1 to 3 million years ago. By , when the Bering expedition explored the coasts of the Aleutian and Commander Islands, there were between , and , sea otters on the Pacific coast. River Otters, Lontra canadensis were reintroduced to western NY after being extirpated in the early ’s. The goal of this project was to understand what environmental variables influence habitat selection of river otters, within Monroe County, New York. Water chemistry and the use of benthic macroinvertebrates assesswere investigated to.

    The giant river otter (Pteronura brasiliensis), also known as the giant Brazilian otter and giant otter, is the largest river otter species in the world. At 6 feet long, this species is twice the length of other otter species. Native to South America, giant river otters are mostly found in the Amazon basin. The river otter (Lutra canadensis) is a member of the Mustelidae or weasel family. It is an amphibious member of this family as are the mink and sea otter. While many states experienced declines in river otter densities, distribution, and in some cases extirpation in the mid ’s – ’s, Georgia’s population remained fairly.


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Productivity, survival, and population status of river otter in western Oregon by James Eldon Tabor Download PDF EPUB FB2

Abstract: Population status of the river otter (Lutra canadensis) in western Oregon was evaluated by using structural population modeling. Survival and recruitment rates for the female segment of the pop-ulation were estimated from the age structure of a and population status of river otter in western Oregon book of female otters obtained from trappers.

Once widely distributed across North America, river otter (Lontra canadensis) were extirpated by themidth century from much of their historic range due to habitat loss, pollution, and over-trapping (J).Otter have persisted in northern and eastern New York State, and population status of river otter in western Oregon book their populations today areconsidered to be stable.

Attempts to restore otter in the rest of the state have included. River otter (Lontra canadensis) populations in Illinois have rebounded considerably after >80 y of harvest protection and a successful re-introduction program.

However, few studies of river otter survival ecology exist in the Midwestern U.S. We estimated survival rates and mortality causes for river otters in southern Illinois during – Thirty-four (16 F, 18 M) river otters were Cited by: 1. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).

The North American river otter (Lontra canadensis), also known as the northern river otter or common otter, is a semiaquatic mammal endemic to the North American continent found in and along its waterways and coasts. An adult North American river otter can weigh between and 14 kg ( and lb).

The river otter is protected and insulated by a thick, water-repellent coat of : Mustelidae. The North American river otter occurs in much of Canada and the United States, except for portions of the Southwest, and in Mexico in the Rio Grande and Colorado River delta areas.

They can thrive in any water habitat, such as ponds, marshes, lakes, rivers, and estuaries—in cold, warm, or even high-elevation areas—as long as the habitat. The playful North American river otter is equally at home in the water and on land.

It makes its home in a burrow near the water's edge, and can thrive in river, lake, swamp, or estuary ecosystems. North American river otters are the only river otter that is found north of Mexico. This animal’s lovely waterproof pelt, which allows it to regulate its temperature, in the ss, a regular part of French fur trade, has meant this animal has been hunted for hundreds of years.

Its fur ranges in color from white and gray to brown and black. Spunky fish-chomping river otters who faced extinction in Colorado and other Western states are bouncing back -- evidence that keeping waterways.

The North American river otter (Lontra canadensis) is a semiaquatic mammal in the weasel it may simply be called the "river otter" in North America (to distinguish it from the sea otter) there are other river otter species throughout the world.

Despite its common name, the North American river otter is equally comfortable in either coastal marine or freshwater habitats. Environmental contaminants in male river otters from Oregon and Washington, USA, – Serfass, T.

and Brooks, R., Survival and Post-release Movements of River Otters Translocated to Western New York. Food Habits and Fish Prey Size Selection of a Newly Colonizing Population of River Otters (Lontra canadensis) in Eastern.

Otter Population Analyses By Nathan M. Roberts Abstract Aerial surveys were conducted for river otters during the winter of In the northern management zone 27 transects were surveyed.

In the central and southern management zones, 3 and 14 transects were surveys respectively. Management zones have been.

ABSTRACT Determining causes of mortality and estimating survival rates can provide insight into the status of species for which population trends are not well understood.

From Apr. –May we radio-marked and monitored 39 (13 adult males; 6 subadult males; 8 adult females; 12 subadult females) river otters (Lontra canadensis) in the upper Mississippi River watershed to document causes. the 49 continental states (USA) to update status and management of river otters, with emphasis on reviewing the use of reintroduction as a management tool to restore extir- pated otter populations.

As ofriver otters occupied at least portions of their his- toric range in every state except New Mexico. Between and21 states and l. The river otter will be considered for down-listing from Endangered to Threatened status when three populations are established on separate rivers, each of which meet the following criteria: 1.

River otters occupy a minimum of 50 kilometer (km) (31 miles) of contiguous stream length. Mission: Maintain river otter populations in balance with their habitat through proper population monitoring and harvest management.

GOAL 1. Maintain sustained river otter populations within suitable habitat. Objective Annually monitor statewide river otter status, distribution, and population. Survival and Post-release Movements of River Otters Translocated to Western New York Article (PDF Available) in Northeastern Naturalist 15(Mar ) March with Reads.

River otters (Lontra canadensis) were reintroduced from – into parts of Illinois where the species was extirpated due to over harvest and habitat the time of reintroduction, managing for the persistence of the population through habitat was very important and research was conducted to determine which watersheds had quality habitat and which needed increased management and.

the otter population Discussion The limited recent data from the otter aerial survey, together with the incongruity among 1) trends in track sightings on aerial survey, 2) otter harvest success rates (Dhuey et al. ), and 3) opinions of beaver trappers regarding otter population status (Dhuey and Olson ).

revealed signs of otter occupation on the river Sangro, which is located in the north-western part of the study area (D e C a s t r o & L o y ). Material and Methods.

Wildlife Population Dynamics: PheasantLandscape Ecology. Like much of the rest of North America, river otter (Lutra canadensis) were abundant in Iowa during European settlement, but unregulated trapping and hunting, and loss of habitat caused them to be essentially extirpated in the fe managers began reintroduction efforts in the ’s that have helped make otters widespread in.

6. Age, ovulation rate and litter size for female river otter collected in Maryland () 11 7. Age classes and survival rates of female river otter collected in Maryland () 12 List of Figures Cover Photo—River otter feeding on a frog (Photo by Leonard Lee Rue).

1.North American river otters are capable of swimming at speeds of seven miles per hour, and can reach 18 miles per hour at a full run. The life expectancy for this species in the wild is only about ten years, but with the steady food supply and protection that zoos afford.