Seven years of blue and fin whale call abundance in the Southern California Bight
Blue whales Balaenoptera musculus and fin whales B. physalus are common inhabitants of the Southern California Bight (SCB), but little is known about the spatial and temporal variability of their use of this area. To study their distribution in the SCB, high-frequency acoustic recording packages wer...
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ftcdlib:oai:escholarship.org:ark:/13030/qt1pd3s2m8 2024-09-09T19:31:37+00:00 Seven years of blue and fin whale call abundance in the Southern California Bight Širovic, A Rice, A Chou, E Hildebrand, JA Wiggins, SM Roch, MA 61 - 76 2015-06-24 https://escholarship.org/uc/item/1pd3s2m8 https://doi.org/10.3354/esr00676 unknown eScholarship, University of California qt1pd3s2m8 https://escholarship.org/uc/item/1pd3s2m8 doi:10.3354/esr00676 public Endangered Species Research, vol 28, iss 1 Environmental Sciences Biological Sciences Ecology article 2015 ftcdlib https://doi.org/10.3354/esr00676 2024-06-28T06:28:20Z Blue whales Balaenoptera musculus and fin whales B. physalus are common inhabitants of the Southern California Bight (SCB), but little is known about the spatial and temporal variability of their use of this area. To study their distribution in the SCB, high-frequency acoustic recording packages were intermittently deployed at 16 locations across the SCB from 2006 to 2012. Presence of blue whale B calls and fin whale 20Hz calls was determined using 2 types of automatic detection methods, i.e. spectrogram correlation and acoustic energy detection, respectively. Blue whale B calls were generally detected between June and January, with a peak in September, with an overall total of over 3 million detections. Fin whale 20Hz calls, measured via the fin whale call index, were present year-round, with the highest values between September and December, with a peak in November. Blue whale calls were more common at coastal sites and near the northern Channel Islands, while the fin whale call index was highest in the central and southern areas of the SCB, indicating a possible difference in habitat preferences of the 2 species in this area. Across years, a peak in blue whale call detections occurred in 2008, with minima in 2006 and 2007, but there was no long-term trend. There was an increase in the fin whale call index during this period. These trends are consistent with visual survey estimates for both species in Southern California, providing evidence that passive acoustics can be a powerful tool to monitor population trends for these endangered species. Article in Journal/Newspaper Balaenoptera musculus Blue whale Fin whale University of California: eScholarship Endangered Species Research 28 1 61 76 |
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Open Polar |
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University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Environmental Sciences Biological Sciences Ecology |
spellingShingle |
Environmental Sciences Biological Sciences Ecology Širovic, A Rice, A Chou, E Hildebrand, JA Wiggins, SM Roch, MA Seven years of blue and fin whale call abundance in the Southern California Bight |
topic_facet |
Environmental Sciences Biological Sciences Ecology |
description |
Blue whales Balaenoptera musculus and fin whales B. physalus are common inhabitants of the Southern California Bight (SCB), but little is known about the spatial and temporal variability of their use of this area. To study their distribution in the SCB, high-frequency acoustic recording packages were intermittently deployed at 16 locations across the SCB from 2006 to 2012. Presence of blue whale B calls and fin whale 20Hz calls was determined using 2 types of automatic detection methods, i.e. spectrogram correlation and acoustic energy detection, respectively. Blue whale B calls were generally detected between June and January, with a peak in September, with an overall total of over 3 million detections. Fin whale 20Hz calls, measured via the fin whale call index, were present year-round, with the highest values between September and December, with a peak in November. Blue whale calls were more common at coastal sites and near the northern Channel Islands, while the fin whale call index was highest in the central and southern areas of the SCB, indicating a possible difference in habitat preferences of the 2 species in this area. Across years, a peak in blue whale call detections occurred in 2008, with minima in 2006 and 2007, but there was no long-term trend. There was an increase in the fin whale call index during this period. These trends are consistent with visual survey estimates for both species in Southern California, providing evidence that passive acoustics can be a powerful tool to monitor population trends for these endangered species. |
format |
Article in Journal/Newspaper |
author |
Širovic, A Rice, A Chou, E Hildebrand, JA Wiggins, SM Roch, MA |
author_facet |
Širovic, A Rice, A Chou, E Hildebrand, JA Wiggins, SM Roch, MA |
author_sort |
Širovic, A |
title |
Seven years of blue and fin whale call abundance in the Southern California Bight |
title_short |
Seven years of blue and fin whale call abundance in the Southern California Bight |
title_full |
Seven years of blue and fin whale call abundance in the Southern California Bight |
title_fullStr |
Seven years of blue and fin whale call abundance in the Southern California Bight |
title_full_unstemmed |
Seven years of blue and fin whale call abundance in the Southern California Bight |
title_sort |
seven years of blue and fin whale call abundance in the southern california bight |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/1pd3s2m8 https://doi.org/10.3354/esr00676 |
op_coverage |
61 - 76 |
genre |
Balaenoptera musculus Blue whale Fin whale |
genre_facet |
Balaenoptera musculus Blue whale Fin whale |
op_source |
Endangered Species Research, vol 28, iss 1 |
op_relation |
qt1pd3s2m8 https://escholarship.org/uc/item/1pd3s2m8 doi:10.3354/esr00676 |
op_rights |
public |
op_doi |
https://doi.org/10.3354/esr00676 |
container_title |
Endangered Species Research |
container_volume |
28 |
container_issue |
1 |
container_start_page |
61 |
op_container_end_page |
76 |
_version_ |
1809900478717231104 |