DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip
Marine ecosystems are experiencing rapid shifts under climate change scenarios and baleen whales are vulnerable to environmental change, although not all impacts are yet clear. We identify how the migration behaviour of the Chagos whale, likely a pygmy blue whale (Balaenoptera musculus brevicauda),...
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ftfrontimediafig:oai:figshare.com:article/20129555 2023-05-15T15:36:26+02:00 DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip Junlin Lyra Huang Emmanuelle C. Leroy Gary Truong Tracey L. Rogers 2022-06-23T05:02:11Z https://doi.org/10.3389/fmars.2022.843875.s001 https://figshare.com/articles/dataset/DataSheet_1_Changes_of_Oceanic_Conditions_Drive_Chagos_Whale_Migration_Patterns_in_the_Central_Indian_Ocean_zip/20129555 unknown doi:10.3389/fmars.2022.843875.s001 https://figshare.com/articles/dataset/DataSheet_1_Changes_of_Oceanic_Conditions_Drive_Chagos_Whale_Migration_Patterns_in_the_Central_Indian_Ocean_zip/20129555 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering baleen whale long-term change climate change interannual variability environmental drivers Indian Ocean Dipole (IOD) El Nino Southern Oscillation (ENSO) sea surface temperatures Dataset 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.843875.s001 2022-06-29T23:09:47Z Marine ecosystems are experiencing rapid shifts under climate change scenarios and baleen whales are vulnerable to environmental change, although not all impacts are yet clear. We identify how the migration behaviour of the Chagos whale, likely a pygmy blue whale (Balaenoptera musculus brevicauda), has changed in association with shifts in environmental factors. We used up to 18 years of continuous underwater acoustic recordings to analyse the relationships between whale acoustic presence and sea surface temperature (SST), chlorophyll-a concentration, El-Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). We compared these relationships between two independent sites Diego Garcia southeast (DGS) and Diego Garcia northwest (DGN) where Chagos whales are detected and are suspected to move interannually across the Chagos-Laccadive ridge. We showed that the number of whale songs detected increased on average by 7.7% and 12.6% annually at DGS and DGN respectively. At the DGS site, Chagos whales shifted their arrival time earlier by 4.2 ± 2.0 days/year ± SE and were detected for a longer period by 7.3 ± 1.2 days/year ± SE across 18 years. A larger number of songs were detected during periods of higher chlorophyll-a concentration, and with positive IOD phases. At the DGN site, we did not see an earlier shift in arrival and songs were not detected for a longer period across the 13 years. Whale presence at DGN had a weaker but opposite relationship with chlorophyll-a and IOD. The oceanic conditions in the Indian Ocean are predicted to change under future climate scenarios and this will likely influence Chagos whale migratory behaviour. Understanding how environmental factors influence whale movement patterns can help predict how whales may respond to future environmental change. We demonstrate the value of long-term acoustic monitoring of marine fauna to determine how they may be affected by changing environmental conditions. Dataset Balaenoptera musculus baleen whale baleen whales Blue whale Frontiers: Figshare Indian |
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 baleen whale long-term change climate change interannual variability environmental drivers Indian Ocean Dipole (IOD) El Nino Southern Oscillation (ENSO) sea surface temperatures |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering baleen whale long-term change climate change interannual variability environmental drivers Indian Ocean Dipole (IOD) El Nino Southern Oscillation (ENSO) sea surface temperatures Junlin Lyra Huang Emmanuelle C. Leroy Gary Truong Tracey L. Rogers DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering baleen whale long-term change climate change interannual variability environmental drivers Indian Ocean Dipole (IOD) El Nino Southern Oscillation (ENSO) sea surface temperatures |
description |
Marine ecosystems are experiencing rapid shifts under climate change scenarios and baleen whales are vulnerable to environmental change, although not all impacts are yet clear. We identify how the migration behaviour of the Chagos whale, likely a pygmy blue whale (Balaenoptera musculus brevicauda), has changed in association with shifts in environmental factors. We used up to 18 years of continuous underwater acoustic recordings to analyse the relationships between whale acoustic presence and sea surface temperature (SST), chlorophyll-a concentration, El-Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). We compared these relationships between two independent sites Diego Garcia southeast (DGS) and Diego Garcia northwest (DGN) where Chagos whales are detected and are suspected to move interannually across the Chagos-Laccadive ridge. We showed that the number of whale songs detected increased on average by 7.7% and 12.6% annually at DGS and DGN respectively. At the DGS site, Chagos whales shifted their arrival time earlier by 4.2 ± 2.0 days/year ± SE and were detected for a longer period by 7.3 ± 1.2 days/year ± SE across 18 years. A larger number of songs were detected during periods of higher chlorophyll-a concentration, and with positive IOD phases. At the DGN site, we did not see an earlier shift in arrival and songs were not detected for a longer period across the 13 years. Whale presence at DGN had a weaker but opposite relationship with chlorophyll-a and IOD. The oceanic conditions in the Indian Ocean are predicted to change under future climate scenarios and this will likely influence Chagos whale migratory behaviour. Understanding how environmental factors influence whale movement patterns can help predict how whales may respond to future environmental change. We demonstrate the value of long-term acoustic monitoring of marine fauna to determine how they may be affected by changing environmental conditions. |
format |
Dataset |
author |
Junlin Lyra Huang Emmanuelle C. Leroy Gary Truong Tracey L. Rogers |
author_facet |
Junlin Lyra Huang Emmanuelle C. Leroy Gary Truong Tracey L. Rogers |
author_sort |
Junlin Lyra Huang |
title |
DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
title_short |
DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
title_full |
DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
title_fullStr |
DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
title_full_unstemmed |
DataSheet_1_Changes of Oceanic Conditions Drive Chagos Whale Migration Patterns in the Central Indian Ocean.zip |
title_sort |
datasheet_1_changes of oceanic conditions drive chagos whale migration patterns in the central indian ocean.zip |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.843875.s001 https://figshare.com/articles/dataset/DataSheet_1_Changes_of_Oceanic_Conditions_Drive_Chagos_Whale_Migration_Patterns_in_the_Central_Indian_Ocean_zip/20129555 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Balaenoptera musculus baleen whale baleen whales Blue whale |
genre_facet |
Balaenoptera musculus baleen whale baleen whales Blue whale |
op_relation |
doi:10.3389/fmars.2022.843875.s001 https://figshare.com/articles/dataset/DataSheet_1_Changes_of_Oceanic_Conditions_Drive_Chagos_Whale_Migration_Patterns_in_the_Central_Indian_Ocean_zip/20129555 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.843875.s001 |
_version_ |
1766366786769387520 |