Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea
"A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: As apex predators, killer whales (Orcinus orca), can have large impacts on ecosystems. These impacts can be dependent on ecotype presence. In the North Pacific, three genetically distinct ecotypes exist that...
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Moss Landing Marine Laboratories
2019
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Online Access: | https://hdl.handle.net/20.500.12680/0z709247h |
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ftcalifstateuniv:oai:scholarworks:0z709247h 2024-09-30T14:33:45+00:00 Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea Brijonnay Madrigal Birgitte McDonald Tom Connolly Alison Stimpert Jessica Crance 2019 https://hdl.handle.net/20.500.12680/0z709247h English eng Moss Landing Marine Laboratories California State University, Monterey Bay http://hdl.handle.net/20.500.12680/0z709247h http://rightsstatements.org/vocab/InC/1.0/?creator Copyright by Brijonnay Madrigal 2019 Masters Thesis 2019 ftcalifstateuniv https://doi.org/20.500.12680/0z709247h 2024-09-10T17:06:14Z "A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: As apex predators, killer whales (Orcinus orca), can have large impacts on ecosystems. These impacts can be dependent on ecotype presence. In the North Pacific, three genetically distinct ecotypes exist that differ in diet, range, morphology, and vocal behavior. Killer whales occur in the Chukchi Sea but, few data exist regarding ecotypes present. Since killer whale ecotypes differ in vocal behavior, they can be distinguished based on call type, call rate, and bandwidth. An Autonomous Underwater Recorder for Acoustic Listening (AURAL) device was deployed 75 km off Point Hope, Alaska in the southeastern Chukchi Sea to identify which killer whale ecotypes were present in this region. A total of 1315 killer whale calls were detected on 38 days during the summers of 2013 to 2015. Calls were manually grouped into six categories based on the general call contours: multi-part, downsweep, upsweep, modulated, single modulation and tonal. Most detections were tonal calls (n = 607, 46%), and multi-part calls (n = 351, 27%) that contained high frequency and low frequency components. Comparison of the current call dataset with published literature showed similarities in peak frequency with other transient populations. These results indicate occasional presence of transient killer whales in the southeastern Chukchi Sea. This study provides the first comprehensive, catalogue of transient killer whale vocalizations in this region. RELATED TITLE: Master Thesis Chukchi Chukchi Sea Killer Whale Orca Orcinus orca Alaska Killer whale Scholarworks from California State University Chukchi Sea Pacific Point Hope ENVELOPE(173.306,173.306,52.911,52.911) |
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Scholarworks from California State University |
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ftcalifstateuniv |
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English |
description |
"A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: As apex predators, killer whales (Orcinus orca), can have large impacts on ecosystems. These impacts can be dependent on ecotype presence. In the North Pacific, three genetically distinct ecotypes exist that differ in diet, range, morphology, and vocal behavior. Killer whales occur in the Chukchi Sea but, few data exist regarding ecotypes present. Since killer whale ecotypes differ in vocal behavior, they can be distinguished based on call type, call rate, and bandwidth. An Autonomous Underwater Recorder for Acoustic Listening (AURAL) device was deployed 75 km off Point Hope, Alaska in the southeastern Chukchi Sea to identify which killer whale ecotypes were present in this region. A total of 1315 killer whale calls were detected on 38 days during the summers of 2013 to 2015. Calls were manually grouped into six categories based on the general call contours: multi-part, downsweep, upsweep, modulated, single modulation and tonal. Most detections were tonal calls (n = 607, 46%), and multi-part calls (n = 351, 27%) that contained high frequency and low frequency components. Comparison of the current call dataset with published literature showed similarities in peak frequency with other transient populations. These results indicate occasional presence of transient killer whales in the southeastern Chukchi Sea. This study provides the first comprehensive, catalogue of transient killer whale vocalizations in this region. RELATED TITLE: |
author2 |
Birgitte McDonald Tom Connolly Alison Stimpert Jessica Crance |
format |
Master Thesis |
author |
Brijonnay Madrigal |
spellingShingle |
Brijonnay Madrigal Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
author_facet |
Brijonnay Madrigal |
author_sort |
Brijonnay Madrigal |
title |
Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
title_short |
Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
title_full |
Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
title_fullStr |
Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
title_full_unstemmed |
Determining ecotype presence and the call repertoire of killer whales (Orcinus orca) recorded near Point Hope, Alaska in the southeastern Chukchi Sea |
title_sort |
determining ecotype presence and the call repertoire of killer whales (orcinus orca) recorded near point hope, alaska in the southeastern chukchi sea |
publisher |
Moss Landing Marine Laboratories |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.12680/0z709247h |
long_lat |
ENVELOPE(173.306,173.306,52.911,52.911) |
geographic |
Chukchi Sea Pacific Point Hope |
geographic_facet |
Chukchi Sea Pacific Point Hope |
genre |
Chukchi Chukchi Sea Killer Whale Orca Orcinus orca Alaska Killer whale |
genre_facet |
Chukchi Chukchi Sea Killer Whale Orca Orcinus orca Alaska Killer whale |
op_relation |
http://hdl.handle.net/20.500.12680/0z709247h |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/?creator Copyright by Brijonnay Madrigal 2019 |
op_doi |
https://doi.org/20.500.12680/0z709247h |
_version_ |
1811637541803130880 |