Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales
Eastern South Pacific southern right whales (ESPSRW) are a subpopulation of southern right whales (Eubalaena australis) off the coasts of Peru and Chile recognized by the International Union for the Conservation of Nature (IUCN) as critically endangered as a result of heavy whaling efforts in the la...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/28280 2023-05-15T15:45:15+02:00 Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales Jacobs, Ellen Landea Briones, Rafaela Sayigh, Laela S. Chilense ecoregion, Chile 20120130 - 20120616 2022-03-30 https://hdl.handle.net/1912/28280 unknown Woods Hole Oceanographic Institution https://hdl.handle.net/1912/28280 doi:10.26025/1912/28280 doi:10.26025/1912/28280 Eastern South Pacific southern right whales Marine bioacoustics Chile Diel patterns Upsweep calls Marine conservation Dataset 2022 ftwhoas https://doi.org/10.26025/1912/28280 2022-10-22T22:57:11Z Eastern South Pacific southern right whales (ESPSRW) are a subpopulation of southern right whales (Eubalaena australis) off the coasts of Peru and Chile recognized by the International Union for the Conservation of Nature (IUCN) as critically endangered as a result of heavy whaling efforts in the late 18th to 20th centuries. Most recent population estimates put their numbers around 50 individuals. To test for the efficacy of passive acoustic monitoring of this population, we recorded five months of continuous acoustic data (January 2012-June 2012) off the southwestern tip of Isla de Chiloé. To test for trends in occurrence, we identified a total of 11,313 individual ESPSRW upsweep calls, which have been associated with maintaining contact with conspecifics. Calls increased over the course of the deployment and peaked between April and June, indicating an increase in use of the habitat consistent with the concurrent blue whale migration in the area. A clear diel pattern in which upsweep calls were predominately detected during dusk and night hours was identified, indicating that ESPSRW are likely foraging during daylight hours, as upsweep calls are known to be inversely related to foraging behavior. We also quantified noise levels in the frequency range of their communication (100 Hz third octave) to understand the change in active space whales may be experiencing. We measured noise levels from 90 dB re 1 µPa to 111 dB re 1 µPa (5th and 95th percentile), a 21 dB fluctuation that results in an order-of-magnitude decrease in active space area. We identified sources of high noise at or above the 75th percentile as predominately blue and humpback whale calls (occurring in 71.6% of total sampled minutes) and ship noise (occurring in 69.4% of total sampled minutes). Ship noise was responsible for outliers in excess of 140 dB re 1 µPa. In a population as diminished as ESPSRW, such disruptions of their communication range could result in significant barriers to maintaining contact with conspecifics. Passive acoustic ... Dataset Blue whale Humpback Whale Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Chiloé ENVELOPE(-63.983,-63.983,-65.517,-65.517) Pacific |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Eastern South Pacific southern right whales Marine bioacoustics Chile Diel patterns Upsweep calls Marine conservation |
spellingShingle |
Eastern South Pacific southern right whales Marine bioacoustics Chile Diel patterns Upsweep calls Marine conservation Jacobs, Ellen Landea Briones, Rafaela Sayigh, Laela S. Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
topic_facet |
Eastern South Pacific southern right whales Marine bioacoustics Chile Diel patterns Upsweep calls Marine conservation |
description |
Eastern South Pacific southern right whales (ESPSRW) are a subpopulation of southern right whales (Eubalaena australis) off the coasts of Peru and Chile recognized by the International Union for the Conservation of Nature (IUCN) as critically endangered as a result of heavy whaling efforts in the late 18th to 20th centuries. Most recent population estimates put their numbers around 50 individuals. To test for the efficacy of passive acoustic monitoring of this population, we recorded five months of continuous acoustic data (January 2012-June 2012) off the southwestern tip of Isla de Chiloé. To test for trends in occurrence, we identified a total of 11,313 individual ESPSRW upsweep calls, which have been associated with maintaining contact with conspecifics. Calls increased over the course of the deployment and peaked between April and June, indicating an increase in use of the habitat consistent with the concurrent blue whale migration in the area. A clear diel pattern in which upsweep calls were predominately detected during dusk and night hours was identified, indicating that ESPSRW are likely foraging during daylight hours, as upsweep calls are known to be inversely related to foraging behavior. We also quantified noise levels in the frequency range of their communication (100 Hz third octave) to understand the change in active space whales may be experiencing. We measured noise levels from 90 dB re 1 µPa to 111 dB re 1 µPa (5th and 95th percentile), a 21 dB fluctuation that results in an order-of-magnitude decrease in active space area. We identified sources of high noise at or above the 75th percentile as predominately blue and humpback whale calls (occurring in 71.6% of total sampled minutes) and ship noise (occurring in 69.4% of total sampled minutes). Ship noise was responsible for outliers in excess of 140 dB re 1 µPa. In a population as diminished as ESPSRW, such disruptions of their communication range could result in significant barriers to maintaining contact with conspecifics. Passive acoustic ... |
format |
Dataset |
author |
Jacobs, Ellen Landea Briones, Rafaela Sayigh, Laela S. |
author_facet |
Jacobs, Ellen Landea Briones, Rafaela Sayigh, Laela S. |
author_sort |
Jacobs, Ellen |
title |
Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
title_short |
Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
title_full |
Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
title_fullStr |
Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
title_full_unstemmed |
Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales |
title_sort |
temporal trends and effects of noise on upsweep calls of eastern south pacific southern right whales |
publisher |
Woods Hole Oceanographic Institution |
publishDate |
2022 |
url |
https://hdl.handle.net/1912/28280 |
op_coverage |
Chilense ecoregion, Chile 20120130 - 20120616 |
long_lat |
ENVELOPE(-63.983,-63.983,-65.517,-65.517) |
geographic |
Chiloé Pacific |
geographic_facet |
Chiloé Pacific |
genre |
Blue whale Humpback Whale |
genre_facet |
Blue whale Humpback Whale |
op_source |
doi:10.26025/1912/28280 |
op_relation |
https://hdl.handle.net/1912/28280 doi:10.26025/1912/28280 |
op_doi |
https://doi.org/10.26025/1912/28280 |
_version_ |
1766379581164486656 |