Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents
The estimated total number of seabirds (18,291) killed during the 1997-1998 Point Reyes Tarball Incidents (PRTI) was the largest reported for any oiling event in central California in the last two decades. Oil trajectory analyses and bird beaching patterns were consistent with oil leaking from the s...
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U.S. Oil Spill Liability Trust Fund; National Parks Service; U.S. Fish and Wildlife Service
2012
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ftcalifstateuniv:oai:scholarworks:p8418q69f 2024-09-30T14:33:51+00:00 Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents Harry R. Carter Richard T. Golightly 2012-05-03 http://hdl.handle.net/2148/935 English eng U.S. Oil Spill Liability Trust Fund; National Parks Service; U.S. Fish and Wildlife Service http://hdl.handle.net/2148/935 Point Reyes Uria aalge Tarball incidents Oiled seabirds Common murre Pelecanus occidentalis Brown pelican S.S. Jacob Luckenbach Brachyramphus marmoratus Marbled murrelet Report 2012 ftcalifstateuniv 2024-09-10T17:06:14Z The estimated total number of seabirds (18,291) killed during the 1997-1998 Point Reyes Tarball Incidents (PRTI) was the largest reported for any oiling event in central California in the last two decades. Oil trajectory analyses and bird beaching patterns were consistent with oil leaking from the sunken vessel S.S. Jacob Luckenbach and 95% of oiled feather samples matched those from the sunken vessel. Large numbers (2,959) of individual birds were recovered on searched beaches: 2,577 were dead when found or died in captivity, while 382 underwent cleaning and captive care before release. Such high numbers of beached birds reflected a series of tarball incidents during a four-month period that spread over a large coastal area with high densities of wintering seabirds and were not related to unusual weather patterns that might have increased carcass deposition on beaches. Predominant species recovered were Common Murres (1,858), with moderate numbers of Northern Fulmars (335), Western Grebes (191), Surf Scoters (90), Brandt’s Cormorants (60), and Pacific Loons (54). Smaller numbers of threatened and endangered Marbled Murrelets (3) and Brown Pelicans (21), as well as several other species, also were recovered. A beached bird model was used to estimate total mortality from beached bird data, after accounting for factors causing undercounting of beached birds (i.e., searcher efficiency, scavenging, and unsearched beaches), at-sea loss due to carcass sinking for offshore species only, and background mortality. Estimates of total mortality, excluding released birds, were calculated for Common Murres (9,094), Marbled Murrelet (122), Brown Pelican (123), other nearshore species (2,334), and other offshore species (6,618). PRTI mortality of Common Murres was the highest ever reported for any spill event in central California. Impacts to the relatively small Drake’s Bay Colony Complex with the Point Reyes National Seashore were well documented. In 1993-1997, this complex had been recovering at a rate of 11.7% per annum ... Report Common Murre Uria aalge uria Scholarworks from California State University Pacific |
institution |
Open Polar |
collection |
Scholarworks from California State University |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
Point Reyes Uria aalge Tarball incidents Oiled seabirds Common murre Pelecanus occidentalis Brown pelican S.S. Jacob Luckenbach Brachyramphus marmoratus Marbled murrelet |
spellingShingle |
Point Reyes Uria aalge Tarball incidents Oiled seabirds Common murre Pelecanus occidentalis Brown pelican S.S. Jacob Luckenbach Brachyramphus marmoratus Marbled murrelet Harry R. Carter Richard T. Golightly Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
topic_facet |
Point Reyes Uria aalge Tarball incidents Oiled seabirds Common murre Pelecanus occidentalis Brown pelican S.S. Jacob Luckenbach Brachyramphus marmoratus Marbled murrelet |
description |
The estimated total number of seabirds (18,291) killed during the 1997-1998 Point Reyes Tarball Incidents (PRTI) was the largest reported for any oiling event in central California in the last two decades. Oil trajectory analyses and bird beaching patterns were consistent with oil leaking from the sunken vessel S.S. Jacob Luckenbach and 95% of oiled feather samples matched those from the sunken vessel. Large numbers (2,959) of individual birds were recovered on searched beaches: 2,577 were dead when found or died in captivity, while 382 underwent cleaning and captive care before release. Such high numbers of beached birds reflected a series of tarball incidents during a four-month period that spread over a large coastal area with high densities of wintering seabirds and were not related to unusual weather patterns that might have increased carcass deposition on beaches. Predominant species recovered were Common Murres (1,858), with moderate numbers of Northern Fulmars (335), Western Grebes (191), Surf Scoters (90), Brandt’s Cormorants (60), and Pacific Loons (54). Smaller numbers of threatened and endangered Marbled Murrelets (3) and Brown Pelicans (21), as well as several other species, also were recovered. A beached bird model was used to estimate total mortality from beached bird data, after accounting for factors causing undercounting of beached birds (i.e., searcher efficiency, scavenging, and unsearched beaches), at-sea loss due to carcass sinking for offshore species only, and background mortality. Estimates of total mortality, excluding released birds, were calculated for Common Murres (9,094), Marbled Murrelet (122), Brown Pelican (123), other nearshore species (2,334), and other offshore species (6,618). PRTI mortality of Common Murres was the highest ever reported for any spill event in central California. Impacts to the relatively small Drake’s Bay Colony Complex with the Point Reyes National Seashore were well documented. In 1993-1997, this complex had been recovering at a rate of 11.7% per annum ... |
format |
Report |
author |
Harry R. Carter Richard T. Golightly |
author_facet |
Harry R. Carter Richard T. Golightly |
author_sort |
Harry R. Carter |
title |
Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
title_short |
Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
title_full |
Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
title_fullStr |
Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
title_full_unstemmed |
Seabird Injuries from the 1997-1998 Point Reyes Tarball Incidents |
title_sort |
seabird injuries from the 1997-1998 point reyes tarball incidents |
publisher |
U.S. Oil Spill Liability Trust Fund; National Parks Service; U.S. Fish and Wildlife Service |
publishDate |
2012 |
url |
http://hdl.handle.net/2148/935 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Common Murre Uria aalge uria |
genre_facet |
Common Murre Uria aalge uria |
op_relation |
http://hdl.handle.net/2148/935 |
_version_ |
1811637630058627072 |