Fur Seal Investigations, 1986

Kajimura, Hiroshi

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Fur Seal Investigations, 1986

1989
By Kajimura, Hiroshi
Series: NOAA technical memorandum NMFS F/NWC ; 174

[PDF-39.81 MB]

Select the Download button to view the document

This document is over 5mb in size and cannot be previewed

Details You May Also Like

Details:

Personal Author:

Kajimura, Hiroshi
Corporate Authors:

National Marine Mammal Laboratory (U.S.) ; Northwest Fisheries Science Center (U.S.)

National Marine Mammal Laboratory (U.S.) ; Northwest Fisheries Science Center (U.S.) Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
Description:

Northern fur seal (Callorhinus ursinus) research in 1986 was conducted on the Prihilof Islands, Alaska, and on San Miguel Island and nearby Castle Rock in southern California. Estimates made of the number of pups bom on St. Paul Island in 1986 (167,656 + 16,272) were not significantly different from the estimated total number bom in 1985 (182,258 + 18,887). The estimated fractions of sheared animals determined from photographs and actual field counts (shear ing-sairpling method) taken during 1986 are not significantly different from each other. Pelagic studies during 1986 were restricted to an analysis of feeding data collected near the Pribilof Islands during 1985. Studies showed that key predatory fish and fur seals consumed walleye pollock (Theraara chalcogramma) as a major dietary component. It was estimated that fur seals consumed as much pollock (132.5 x 103t) as walleye pollock did preying on pollock (134 x 103t). Currently the population of the San Miguel Island fur seal colony appears to be slowly increasing and has now reached numbers observed in the late 1970's. The decline was associated with the 1983 El Nino event which brought about a 60% decline in pup production and a 48% decrease in numbers of adult females. In 1986 670 pups were bom and a maximum female count was422 or 65% and 67% of the 1982 values, respectively. On Castle Rock, a count of 576 pups represented an increase in pup production of 78.3% more pups than the 1985 count of 323 pups.
Keywords:

[+]

Northern Fur Seal Statistics
Series:

NOAA technical memorandum NMFS F/NWC ; 174
Document Type:

Technical Memorandum
Place as Subject:

Alaska ; Pribilof Islands ; California ; San Miguel Island

Alaska ; Pribilof Islands ; California ; San Miguel Island Less -
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:93387104a5599670e747e3eec9270f947cac5a961227f1ce3690c0448787a83d
Download URL:

https://repository.library.noaa.gov/view/noaa/26577/noaa_26577_DS1.pdf
File Type:

No Additional Files

More +

Fur Seal Investigations, 1986

Details:

Supporting Files

You May Also Like