Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific
Short-tailed albatrosses (Phoebastria albatrus, hereafter "STAL") migrate throughout the North Pacific, overlapping with multiple large scale fisheries. In the Bering Sea, documented bycatch of this species is a focal conservation concern, due to the fact that this species is listed as &qu...
Main Author: | |
---|---|
Other Authors: | , , , , |
Format: | Master Thesis |
Language: | English unknown |
Published: |
Oregon State University
|
Subjects: | |
Online Access: | https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88ck505 |
id |
ftoregonstate:ir.library.oregonstate.edu:7p88ck505 |
---|---|
record_format |
openpolar |
spelling |
ftoregonstate:ir.library.oregonstate.edu:7p88ck505 2024-09-15T17:36:27+00:00 Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific O'Connor, Amelia J. Suryan, Robert M. Thompson, Grant Graham, James College of Earth, Ocean, and Atmospheric Sciences Oregon State University. Graduate School https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88ck505 English [eng] eng unknown Oregon State University https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88ck505 All rights reserved Phoebastria -- Effect of fishing on -- North Pacific Region Phoebastria -- North Pacific Region -- Geographical distribution Phoebastria -- Seasonal distribution -- North Pacific Region Phoebastria -- North Pacific Region Masters Thesis ftoregonstate 2024-07-22T18:06:06Z Short-tailed albatrosses (Phoebastria albatrus, hereafter "STAL") migrate throughout the North Pacific, overlapping with multiple large scale fisheries. In the Bering Sea, documented bycatch of this species is a focal conservation concern, due to the fact that this species is listed as "endangered" under the U.S. Endangered Species Act. We conducted the first year-round tracking study of immature (≤3 years) STAL, an understudied age class, between 2008 and 2012. We quantify seasonal distributions and fisheries associations. Our findings highlight regional differences in distributions and areas of high vessel associations within the Bering Sea. We examined travel distances across seasons and bird demographics, seasonal ranges of birds, and whether core use areas differed among ages, sexes, or source colonies. Source colonies include Torishima, the main STAL colony, and an anticipated new colony on Mukojima where birds were translocated and hand-reared. Linear mixed models (LMM) were used to evaluate travel distances across temporal and demographic (sex, age, and source colony) variables. Kernel density estimations (KDE) were used to quantify range and core areas. These areas were further analyzed using overlap indices. Regional variations were found in core areas of sexes and age classes. Moreover, STAL in first year of flight have a broader distribution than other ages, which may suggest a period of learning foraging skills or exploratory movements. We also found no concerning differences in year-round distributions between colonies (which included translocated and non-translocated birds), and documented via satellite tracking an initial return to Mukojima by a three year old translocated bird. In the Bering Sea, we examined seasonal distributions and STAL association with Bering Sea/Aleutian Island fisheries. Associations (defined here as STAL locations within 2 hours and 10 kilometers from a vessel setting gear), were quantified spatially and examined with a LMM. STAL-vessel associations occurred year round ... Master Thesis Aleutian Island Bering Sea ScholarsArchive@OSU (Oregon State University) |
institution |
Open Polar |
collection |
ScholarsArchive@OSU (Oregon State University) |
op_collection_id |
ftoregonstate |
language |
English unknown |
topic |
Phoebastria -- Effect of fishing on -- North Pacific Region Phoebastria -- North Pacific Region -- Geographical distribution Phoebastria -- Seasonal distribution -- North Pacific Region Phoebastria -- North Pacific Region |
spellingShingle |
Phoebastria -- Effect of fishing on -- North Pacific Region Phoebastria -- North Pacific Region -- Geographical distribution Phoebastria -- Seasonal distribution -- North Pacific Region Phoebastria -- North Pacific Region O'Connor, Amelia J. Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
topic_facet |
Phoebastria -- Effect of fishing on -- North Pacific Region Phoebastria -- North Pacific Region -- Geographical distribution Phoebastria -- Seasonal distribution -- North Pacific Region Phoebastria -- North Pacific Region |
description |
Short-tailed albatrosses (Phoebastria albatrus, hereafter "STAL") migrate throughout the North Pacific, overlapping with multiple large scale fisheries. In the Bering Sea, documented bycatch of this species is a focal conservation concern, due to the fact that this species is listed as "endangered" under the U.S. Endangered Species Act. We conducted the first year-round tracking study of immature (≤3 years) STAL, an understudied age class, between 2008 and 2012. We quantify seasonal distributions and fisheries associations. Our findings highlight regional differences in distributions and areas of high vessel associations within the Bering Sea. We examined travel distances across seasons and bird demographics, seasonal ranges of birds, and whether core use areas differed among ages, sexes, or source colonies. Source colonies include Torishima, the main STAL colony, and an anticipated new colony on Mukojima where birds were translocated and hand-reared. Linear mixed models (LMM) were used to evaluate travel distances across temporal and demographic (sex, age, and source colony) variables. Kernel density estimations (KDE) were used to quantify range and core areas. These areas were further analyzed using overlap indices. Regional variations were found in core areas of sexes and age classes. Moreover, STAL in first year of flight have a broader distribution than other ages, which may suggest a period of learning foraging skills or exploratory movements. We also found no concerning differences in year-round distributions between colonies (which included translocated and non-translocated birds), and documented via satellite tracking an initial return to Mukojima by a three year old translocated bird. In the Bering Sea, we examined seasonal distributions and STAL association with Bering Sea/Aleutian Island fisheries. Associations (defined here as STAL locations within 2 hours and 10 kilometers from a vessel setting gear), were quantified spatially and examined with a LMM. STAL-vessel associations occurred year round ... |
author2 |
Suryan, Robert M. Thompson, Grant Graham, James College of Earth, Ocean, and Atmospheric Sciences Oregon State University. Graduate School |
format |
Master Thesis |
author |
O'Connor, Amelia J. |
author_facet |
O'Connor, Amelia J. |
author_sort |
O'Connor, Amelia J. |
title |
Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
title_short |
Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
title_full |
Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
title_fullStr |
Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
title_full_unstemmed |
Distributions and fishery associations of immature short-tailed albatrosses (Phoebastria albatrus) in the North Pacific |
title_sort |
distributions and fishery associations of immature short-tailed albatrosses (phoebastria albatrus) in the north pacific |
publisher |
Oregon State University |
url |
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88ck505 |
genre |
Aleutian Island Bering Sea |
genre_facet |
Aleutian Island Bering Sea |
op_relation |
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88ck505 |
op_rights |
All rights reserved |
_version_ |
1810489654933192704 |