Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California
We document changes in the number of sightings and timing of humpback (Megaptera novaeangliae), blue (Balaenoptera musculus), and gray (Eschrichtius robustus) whale migratory phases in the vicinity of the Farallon Islands, California. We hypothesized that changes in the timing of migration off centr...
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Online Access: | https://scholarworks.wm.edu/vimsarticles/2072 https://doi.org/10.1371/journal.pone.0248557 https://scholarworks.wm.edu/context/vimsarticles/article/3072/viewcontent/journal.pone.0248557.pdf https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/0/type/additional/viewcontent/pone.0248557.s001.docx https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/1/type/additional/viewcontent/journal.pone.0248557.s002.tif |
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-3072 2023-06-11T04:10:27+02:00 Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California Ingman, Kaytlin Hines, Ellen Mazzini, Piero L. F. 2021-04-01T07:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/2072 https://doi.org/10.1371/journal.pone.0248557 https://scholarworks.wm.edu/context/vimsarticles/article/3072/viewcontent/journal.pone.0248557.pdf https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/0/type/additional/viewcontent/pone.0248557.s001.docx https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/1/type/additional/viewcontent/journal.pone.0248557.s002.tif unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/2072 doi: doi:10.1371/journal.pone.0248557 https://scholarworks.wm.edu/context/vimsarticles/article/3072/viewcontent/journal.pone.0248557.pdf https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/0/type/additional/viewcontent/pone.0248557.s001.docx https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/1/type/additional/viewcontent/journal.pone.0248557.s002.tif VIMS Articles Physical Sciences Peer-Reviewed Articles Marine Biology text 2021 ftwilliammarycol https://doi.org/10.1371/journal.pone.0248557</p>10.1371/journal.pone.0248557 2023-05-04T17:48:10Z We document changes in the number of sightings and timing of humpback (Megaptera novaeangliae), blue (Balaenoptera musculus), and gray (Eschrichtius robustus) whale migratory phases in the vicinity of the Farallon Islands, California. We hypothesized that changes in the timing of migration off central California were driven by local oceanography, regional upwelling, and basin-scale climate conditions. Using 24 years of daily whale counts collected from Southeast Farallon Island, we developed negative binomial regression models to evaluate trends in local whale sightings over time. We then used linear models to assess trends in the timing of migration, and to identify potential environmental drivers. These drivers included local, regional and basin-scale patterns; the latter included the El Niño Southern Oscillation, the Pacific Decadal Oscillation, and the North Pacific Gyre Oscillation, which influence, wind-driven upwelling, and overall productivity in the California Current System. We then created a forecast model to predict the timing of migration. Humpback whale sightings significantly increased over the study period, but blue and gray whale counts did not, though there was variability across the time series. Date of breeding migration (departure) for all species showed little to no change, whereas date of migration towards feeding areas (arrival) occurred earlier for humpback and blue whales. Timing was significantly influenced by a mix of local oceanography, regional, and basin-scale climate variables. Earlier arrival time without concomitant earlier departure time results in longer periods when blue and humpback whales are at risk of entanglement in the Gulf of the Farallones. We maintain that these changes have increased whale exposure to pot and trap fishery gear off the central California coast during the spring, elevating the risk of entanglements. Humpback entanglement rates were significantly associated with increased counts and early arrival in central California. Actions to decrease the temporal ... Text Balaenoptera musculus baleen whale Humpback Whale Megaptera novaeangliae W&M ScholarWorks Pacific |
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Physical Sciences Peer-Reviewed Articles Marine Biology |
spellingShingle |
Physical Sciences Peer-Reviewed Articles Marine Biology Ingman, Kaytlin Hines, Ellen Mazzini, Piero L. F. Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
topic_facet |
Physical Sciences Peer-Reviewed Articles Marine Biology |
description |
We document changes in the number of sightings and timing of humpback (Megaptera novaeangliae), blue (Balaenoptera musculus), and gray (Eschrichtius robustus) whale migratory phases in the vicinity of the Farallon Islands, California. We hypothesized that changes in the timing of migration off central California were driven by local oceanography, regional upwelling, and basin-scale climate conditions. Using 24 years of daily whale counts collected from Southeast Farallon Island, we developed negative binomial regression models to evaluate trends in local whale sightings over time. We then used linear models to assess trends in the timing of migration, and to identify potential environmental drivers. These drivers included local, regional and basin-scale patterns; the latter included the El Niño Southern Oscillation, the Pacific Decadal Oscillation, and the North Pacific Gyre Oscillation, which influence, wind-driven upwelling, and overall productivity in the California Current System. We then created a forecast model to predict the timing of migration. Humpback whale sightings significantly increased over the study period, but blue and gray whale counts did not, though there was variability across the time series. Date of breeding migration (departure) for all species showed little to no change, whereas date of migration towards feeding areas (arrival) occurred earlier for humpback and blue whales. Timing was significantly influenced by a mix of local oceanography, regional, and basin-scale climate variables. Earlier arrival time without concomitant earlier departure time results in longer periods when blue and humpback whales are at risk of entanglement in the Gulf of the Farallones. We maintain that these changes have increased whale exposure to pot and trap fishery gear off the central California coast during the spring, elevating the risk of entanglements. Humpback entanglement rates were significantly associated with increased counts and early arrival in central California. Actions to decrease the temporal ... |
format |
Text |
author |
Ingman, Kaytlin Hines, Ellen Mazzini, Piero L. F. |
author_facet |
Ingman, Kaytlin Hines, Ellen Mazzini, Piero L. F. |
author_sort |
Ingman, Kaytlin |
title |
Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
title_short |
Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
title_full |
Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
title_fullStr |
Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
title_full_unstemmed |
Modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in California |
title_sort |
modeling changes in baleen whale seasonal abundance, timing of migration, and environmental variables to explain the sudden rise in entanglements in california |
publisher |
W&M ScholarWorks |
publishDate |
2021 |
url |
https://scholarworks.wm.edu/vimsarticles/2072 https://doi.org/10.1371/journal.pone.0248557 https://scholarworks.wm.edu/context/vimsarticles/article/3072/viewcontent/journal.pone.0248557.pdf https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/0/type/additional/viewcontent/pone.0248557.s001.docx https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/1/type/additional/viewcontent/journal.pone.0248557.s002.tif |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Balaenoptera musculus baleen whale Humpback Whale Megaptera novaeangliae |
genre_facet |
Balaenoptera musculus baleen whale Humpback Whale Megaptera novaeangliae |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/2072 doi: doi:10.1371/journal.pone.0248557 https://scholarworks.wm.edu/context/vimsarticles/article/3072/viewcontent/journal.pone.0248557.pdf https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/0/type/additional/viewcontent/pone.0248557.s001.docx https://scholarworks.wm.edu/context/vimsarticles/article/3072/filename/1/type/additional/viewcontent/journal.pone.0248557.s002.tif |
op_doi |
https://doi.org/10.1371/journal.pone.0248557</p>10.1371/journal.pone.0248557 |
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1768384859309342720 |