Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg
Northern Chilean Patagonia is a mega-estuarine system where oceanic waters mix with freshwater inputs in the coastal fjords, channels and gulfs. The aim of this study was to examine the distribution of blue and sei whales with respect to oceanographic conditions of the study area from the estuarine...
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ftfrontimediafig:oai:figshare.com:article/21293340 2023-05-15T13:52:54+02:00 Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg Susannah J. Buchan Laura Gutiérrez Mark F. Baumgartner Kathleen M. Stafford Nadin Ramirez Oscar Pizarro Jose Cifuentes 2022-10-07T06:31:38Z https://doi.org/10.3389/fmars.2022.903964.s002 https://figshare.com/articles/figure/Image_2_Distribution_of_blue_and_sei_whale_vocalizations_and_temperature_-_salinity_characteristics_from_glider_surveys_in_the_Northern_Chilean_Patagonia_mega-estuarine_system_jpeg/21293340 unknown doi:10.3389/fmars.2022.903964.s002 https://figshare.com/articles/figure/Image_2_Distribution_of_blue_and_sei_whale_vocalizations_and_temperature_-_salinity_characteristics_from_glider_surveys_in_the_Northern_Chilean_Patagonia_mega-estuarine_system_jpeg/21293340 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering pelagic ecology baleen whales passive acoustic monitoring Slocum glider Image Figure 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.903964.s002 2022-10-12T23:10:01Z Northern Chilean Patagonia is a mega-estuarine system where oceanic waters mix with freshwater inputs in the coastal fjords, channels and gulfs. The aim of this study was to examine the distribution of blue and sei whales with respect to oceanographic conditions of the study area from the estuarine inner sea to the outer ocean. Ocean gliders were used, mounted with a hydrophone to determine acoustic presence of whales (Southeast Pacific and Antarctic blue whale song calls, and blue whales D-calls; sei whale downsweeps and upsweeps), and a temperature and salinity instrument. Four glider deployments were carried out in April 2018 and April-June 2019 navigating a total of 2817 kilometers during 2110 hours. To examine interannual variation, the average percentage of day with presence of calls was compared between years using the adjusted p-values for one-way ANOVA and descriptive statistics. To examine spatial variation between the hourly acoustic presence of blue whales and sei whales and temperature and salinity conditions, Generalized Linear Models (GLMs) were used. Salinities were higher in 2019 compared to 2018. Southeast Pacific blue whales produced song calls throughout the study area in both years, across estuarine and oceanic areas, but percentage of day with presence was higher in 2019 vs 2018. Percentage of day with presence of D-calls was similar between years, but higher in oceanic areas during both study periods. In contrast, the spatial pattern of sei whale acoustic presence was ambiguous and interannual variability was high, suggesting that sei whales preferred estuarine areas in 2018 and oceanic areas in 2019. We discuss possible explanations for observed acoustic presence in relation to foraging behavior and prey distribution. Still Image Antarc* Antarctic baleen whales Blue whale Sei Whale Frontiers: Figshare Antarctic Pacific Patagonia |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering pelagic ecology baleen whales passive acoustic monitoring Slocum glider |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering pelagic ecology baleen whales passive acoustic monitoring Slocum glider Susannah J. Buchan Laura Gutiérrez Mark F. Baumgartner Kathleen M. Stafford Nadin Ramirez Oscar Pizarro Jose Cifuentes Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering pelagic ecology baleen whales passive acoustic monitoring Slocum glider |
description |
Northern Chilean Patagonia is a mega-estuarine system where oceanic waters mix with freshwater inputs in the coastal fjords, channels and gulfs. The aim of this study was to examine the distribution of blue and sei whales with respect to oceanographic conditions of the study area from the estuarine inner sea to the outer ocean. Ocean gliders were used, mounted with a hydrophone to determine acoustic presence of whales (Southeast Pacific and Antarctic blue whale song calls, and blue whales D-calls; sei whale downsweeps and upsweeps), and a temperature and salinity instrument. Four glider deployments were carried out in April 2018 and April-June 2019 navigating a total of 2817 kilometers during 2110 hours. To examine interannual variation, the average percentage of day with presence of calls was compared between years using the adjusted p-values for one-way ANOVA and descriptive statistics. To examine spatial variation between the hourly acoustic presence of blue whales and sei whales and temperature and salinity conditions, Generalized Linear Models (GLMs) were used. Salinities were higher in 2019 compared to 2018. Southeast Pacific blue whales produced song calls throughout the study area in both years, across estuarine and oceanic areas, but percentage of day with presence was higher in 2019 vs 2018. Percentage of day with presence of D-calls was similar between years, but higher in oceanic areas during both study periods. In contrast, the spatial pattern of sei whale acoustic presence was ambiguous and interannual variability was high, suggesting that sei whales preferred estuarine areas in 2018 and oceanic areas in 2019. We discuss possible explanations for observed acoustic presence in relation to foraging behavior and prey distribution. |
format |
Still Image |
author |
Susannah J. Buchan Laura Gutiérrez Mark F. Baumgartner Kathleen M. Stafford Nadin Ramirez Oscar Pizarro Jose Cifuentes |
author_facet |
Susannah J. Buchan Laura Gutiérrez Mark F. Baumgartner Kathleen M. Stafford Nadin Ramirez Oscar Pizarro Jose Cifuentes |
author_sort |
Susannah J. Buchan |
title |
Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
title_short |
Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
title_full |
Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
title_fullStr |
Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
title_full_unstemmed |
Image_2_Distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the Northern Chilean Patagonia mega-estuarine system.jpeg |
title_sort |
image_2_distribution of blue and sei whale vocalizations, and temperature - salinity characteristics from glider surveys in the northern chilean patagonia mega-estuarine system.jpeg |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.903964.s002 https://figshare.com/articles/figure/Image_2_Distribution_of_blue_and_sei_whale_vocalizations_and_temperature_-_salinity_characteristics_from_glider_surveys_in_the_Northern_Chilean_Patagonia_mega-estuarine_system_jpeg/21293340 |
geographic |
Antarctic Pacific Patagonia |
geographic_facet |
Antarctic Pacific Patagonia |
genre |
Antarc* Antarctic baleen whales Blue whale Sei Whale |
genre_facet |
Antarc* Antarctic baleen whales Blue whale Sei Whale |
op_relation |
doi:10.3389/fmars.2022.903964.s002 https://figshare.com/articles/figure/Image_2_Distribution_of_blue_and_sei_whale_vocalizations_and_temperature_-_salinity_characteristics_from_glider_surveys_in_the_Northern_Chilean_Patagonia_mega-estuarine_system_jpeg/21293340 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.903964.s002 |
_version_ |
1766257756548890624 |