Barlow, Jay and Hohn, Aleta A. (1984) Interpreting spotted dolphin age distributions. La Jolla, CA, NOAA/National Marine Fisheries Service/Southwest Fisheries Science Center, (NOAA Technical Memorandum NMFS, SWFC-4)
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Abstract
Previous work has determined the age distribution from a sample of spotted dolphins (Stenella attenuata) killed in the eastern Pacific tuna purse-seine fishery. In this paper we examine the usefulness of this age distribution for estimating natural mortality rates. The observed age distribution has a deficiency of individuals from 5-15 years and cannot represent a stable age distribution. Sampling bias and errors in age interpretation are examined as possible causes of the "dip" in the observed age structure. Natural mortality rates are estimated for the 15+ age classes based on the assumption that these are sampled representatively. The resulting annual survival rate <D.82) is too low to allow population growth, given what is known about dolphin reproductive rates. (PDF contains 30 pages.)
| Item Type: | Monograph or Serial issue | ||||||
|---|---|---|---|---|---|---|---|
| Title: | Interpreting spotted dolphin age distributions | ||||||
| Personal Creator/Author: |
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| Series Name: | NOAA Technical Memorandum NMFS | ||||||
| Number: | SWFC-4 | ||||||
| Date: | 1984 | ||||||
| Publisher: | NOAA/National Marine Fisheries Service/Southwest Fisheries Science Center | ||||||
| Place of Publication: | La Jolla, CA | ||||||
| Issuing Agency: | United States National Marine Fisheries Service | ||||||
| Uncontrolled Keywords: | Spotted dolphins; Stenella attenuata; seining; by catch; tuna fisheries | ||||||
| Subjects: | Ecology Conservation Fisheries | ||||||
| Item ID: | 2460 | ||||||
| Depositing User: | Patti M. Marraro | ||||||
| Date Deposited: | 21 Jul 2009 16:41 | ||||||
| Last Modified: | 29 Sep 2011 21:05 | ||||||
| URI: | http://aquaticcommons.org/id/eprint/2460 |
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