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Title: Marine bird and sea otter population abundance of Prince william sound, Alaska: Trends following the t/v Exxon Valdez oil spill, 1989-93. Restoration project 93045. Exxon Valdez oil spill restoration project final report

We conducted small boat surveys to estimate marine bird and sea otter (Enhdra lutris) populations in Prince William Sound, Alaska during March and July 1993, using methods developed for the 1989-91 surveys (Klosiewski and Laing 1994). During 1993, we recorded 65 birds and 13 mammal species. We estimated that 402,760 + or - 167,697 marine birds were in the Sound during March 1993, an increase of >200,000 birds over 1990 and 1991. To examine trends in our marine bird population estimates from 1989-93, we assumed that in the absence of oil spill effects, population estimates in the oiled zone would change at the same rate as those in the unoiled zone. For Prince William Sound as a whole, we examined population trends from 1989-1993, using regression analyses. We also examined the relative abundance of the species groups seen in Prince William Sound from 1972 to 1993. Sea otter populations in 1993 were estimated at 6,813 + or - 1,861 for March and 8,216 + or - 2,435 for July. We found no difference in the rate of change between the oiled and unoiled zones from 1989-93 for either the March or July population estimates. There was no significant trend inmore » the total number of sea otters in Prince William Sound from 1989-93.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
371071
Report Number(s):
PB--96-194873/XAB
TRN: 62392968
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: May 1994
Research Org:
Fish and Wildlife Service, Anchorage, AK (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; 02 PETROLEUM; OIL SPILLS; ENVIRONMENTAL EFFECTS; ALASKA; MARINE SURVEYS; BIRDS; POPULATION DYNAMICS; BIOLOGICAL RECOVERY; OTTERS