Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia
A seismic survey was conducted adjacent to the nearshore feeding ground of gray whales Eschrichtius robustus off northeastern Sakhalin Island, Russia. Scan surveys were conducted at 7 shore stations before, during and after the seismic survey. We investigated whether gray whales shifted their distri...
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ftdoajarticles:oai:doaj.org/article:62e0717da9f841929254e8f160a80be0 2023-05-15T18:09:03+02:00 Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia JE Muir L Ainsworth R Joy R Racca Y Bychkov G Gailey V Vladimirov S Starodymov K Bröker 2015-12-01T00:00:00Z https://doi.org/10.3354/esr00701 https://doaj.org/article/62e0717da9f841929254e8f160a80be0 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v29/n2/p161-178/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr00701 https://doaj.org/article/62e0717da9f841929254e8f160a80be0 Endangered Species Research, Vol 29, Iss 2, Pp 161-178 (2015) Zoology QL1-991 Botany QK1-989 article 2015 ftdoajarticles https://doi.org/10.3354/esr00701 2022-12-30T20:22:02Z A seismic survey was conducted adjacent to the nearshore feeding ground of gray whales Eschrichtius robustus off northeastern Sakhalin Island, Russia. Scan surveys were conducted at 7 shore stations before, during and after the seismic survey. We investigated whether gray whales shifted their distribution with respect to distance from the shoreline in response to acoustic pulses from the seismic source. To do this, we used linear mixed effects modelling that included effects of detection, space and time. Data were tested for effects of magnitude and presence/absence of sound from seismic activity on whale distance from shore. Sound covariates were estimated over 3 temporal scales (8 h, 3 d and since the start of seismic activity) at locations 500 and 5000 m offshore each observation station. Sighting distance from shore was less in poor visibility and at earlier times of day. No significant effects of sound were identified, although data suggest that at most stations, sighting distance from shore increased slightly over the 2 wk of the seismic survey. The analysis was limited, however, by several factors that included low numbers of sightings throughout most of the study, non-availability of data on biomass of gray whale prey and sources of error that could not be accounted for in the model. Sensitivity to potential errors in sighting distance estimation was assessed using a correction factor based on known locations of vessels and gray whales when sighted. The model was refitted using distance-corrected sightings. Results were consistent with the original model. Article in Journal/Newspaper Sakhalin Directory of Open Access Journals: DOAJ Articles Endangered Species Research 29 2 161 178 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Zoology QL1-991 Botany QK1-989 |
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Zoology QL1-991 Botany QK1-989 JE Muir L Ainsworth R Joy R Racca Y Bychkov G Gailey V Vladimirov S Starodymov K Bröker Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
A seismic survey was conducted adjacent to the nearshore feeding ground of gray whales Eschrichtius robustus off northeastern Sakhalin Island, Russia. Scan surveys were conducted at 7 shore stations before, during and after the seismic survey. We investigated whether gray whales shifted their distribution with respect to distance from the shoreline in response to acoustic pulses from the seismic source. To do this, we used linear mixed effects modelling that included effects of detection, space and time. Data were tested for effects of magnitude and presence/absence of sound from seismic activity on whale distance from shore. Sound covariates were estimated over 3 temporal scales (8 h, 3 d and since the start of seismic activity) at locations 500 and 5000 m offshore each observation station. Sighting distance from shore was less in poor visibility and at earlier times of day. No significant effects of sound were identified, although data suggest that at most stations, sighting distance from shore increased slightly over the 2 wk of the seismic survey. The analysis was limited, however, by several factors that included low numbers of sightings throughout most of the study, non-availability of data on biomass of gray whale prey and sources of error that could not be accounted for in the model. Sensitivity to potential errors in sighting distance estimation was assessed using a correction factor based on known locations of vessels and gray whales when sighted. The model was refitted using distance-corrected sightings. Results were consistent with the original model. |
format |
Article in Journal/Newspaper |
author |
JE Muir L Ainsworth R Joy R Racca Y Bychkov G Gailey V Vladimirov S Starodymov K Bröker |
author_facet |
JE Muir L Ainsworth R Joy R Racca Y Bychkov G Gailey V Vladimirov S Starodymov K Bröker |
author_sort |
JE Muir |
title |
Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
title_short |
Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
title_full |
Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
title_fullStr |
Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
title_full_unstemmed |
Distance from shore as an indicator of disturbance of gray whales during a seismic survey off Sakhalin Island, Russia |
title_sort |
distance from shore as an indicator of disturbance of gray whales during a seismic survey off sakhalin island, russia |
publisher |
Inter-Research |
publishDate |
2015 |
url |
https://doi.org/10.3354/esr00701 https://doaj.org/article/62e0717da9f841929254e8f160a80be0 |
genre |
Sakhalin |
genre_facet |
Sakhalin |
op_source |
Endangered Species Research, Vol 29, Iss 2, Pp 161-178 (2015) |
op_relation |
https://www.int-res.com/abstracts/esr/v29/n2/p161-178/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr00701 https://doaj.org/article/62e0717da9f841929254e8f160a80be0 |
op_doi |
https://doi.org/10.3354/esr00701 |
container_title |
Endangered Species Research |
container_volume |
29 |
container_issue |
2 |
container_start_page |
161 |
op_container_end_page |
178 |
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1766181448307441664 |