Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus)
Variable movement strategies can complicate the conservation and management of mobile species. Given its extreme life history traits as a long-lived, deep-water species, the Greenland shark (Somniosus microcephalus) is vulnerable to fisheries bycatch, but little is known over its long-term movements...
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2022
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Online Access: | https://doi.org/10.3389/fmars.2022.902854 https://doaj.org/article/e27794ebb94b4819b456c0fcf0331bda |
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ftdoajarticles:oai:doaj.org/article:e27794ebb94b4819b456c0fcf0331bda 2023-05-15T14:54:51+02:00 Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) Jena E. Edwards Kevin J. Hedges Steven T. Kessel Nigel E. Hussey 2022-09-01T00:00:00Z https://doi.org/10.3389/fmars.2022.902854 https://doaj.org/article/e27794ebb94b4819b456c0fcf0331bda EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.902854/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.902854 https://doaj.org/article/e27794ebb94b4819b456c0fcf0331bda Frontiers in Marine Science, Vol 9 (2022) acoustic telemetry arctic marine ecosystem movement ecology seasonality distribution Somniosus microcephalus Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.902854 2022-12-30T19:51:17Z Variable movement strategies can complicate the conservation and management of mobile species. Given its extreme life history traits as a long-lived, deep-water species, the Greenland shark (Somniosus microcephalus) is vulnerable to fisheries bycatch, but little is known over its long-term movements across a spatially and seasonally variable Arctic environment. To address this knowledge gap, the movements of Greenland sharks in coastal fjords and offshore waters of Baffin Bay were examined using seven years of acoustic telemetry data. Seasonal patterns in broad-scale movements and inshore-offshore connectivity were compared among 155 sharks (101 males, 54 females [mean LT = 2.65 ± 0.48 m, range 0.93-3.5 m]) tagged in 6 discrete coastal locations spanning from Grise Fiord to Cumberland Sound (Nunavut). Sharks exhibited transient movements throughout coastal and offshore regions with some evidence of seasonally recurring hotspots revealed by repeat detections of individuals at sites over multiple years. Shark presence in coastal fjords occurred exclusively during the coastal ice-free period (July to November), regardless of the location of tagging or detection, while presence in the offshore was recorded during the period of ice re-formation and cover (November to July). Through multi-year telemetry, it was possible to reveal repetitive patterns in broad-scale habitat use for a complex marine predator with direct relevance for understanding the seasonal distribution of mobile Arctic consumers and informing regional fisheries management. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Cumberland Sound Greenland Grise Fiord Nunavut Somniosus microcephalus Directory of Open Access Journals: DOAJ Articles Arctic Nunavut Baffin Bay Greenland Cumberland Sound ENVELOPE(-66.014,-66.014,65.334,65.334) Grise Fiord ENVELOPE(-82.895,-82.895,76.418,76.418) Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
acoustic telemetry arctic marine ecosystem movement ecology seasonality distribution Somniosus microcephalus Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
acoustic telemetry arctic marine ecosystem movement ecology seasonality distribution Somniosus microcephalus Science Q General. Including nature conservation geographical distribution QH1-199.5 Jena E. Edwards Kevin J. Hedges Steven T. Kessel Nigel E. Hussey Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
topic_facet |
acoustic telemetry arctic marine ecosystem movement ecology seasonality distribution Somniosus microcephalus Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Variable movement strategies can complicate the conservation and management of mobile species. Given its extreme life history traits as a long-lived, deep-water species, the Greenland shark (Somniosus microcephalus) is vulnerable to fisheries bycatch, but little is known over its long-term movements across a spatially and seasonally variable Arctic environment. To address this knowledge gap, the movements of Greenland sharks in coastal fjords and offshore waters of Baffin Bay were examined using seven years of acoustic telemetry data. Seasonal patterns in broad-scale movements and inshore-offshore connectivity were compared among 155 sharks (101 males, 54 females [mean LT = 2.65 ± 0.48 m, range 0.93-3.5 m]) tagged in 6 discrete coastal locations spanning from Grise Fiord to Cumberland Sound (Nunavut). Sharks exhibited transient movements throughout coastal and offshore regions with some evidence of seasonally recurring hotspots revealed by repeat detections of individuals at sites over multiple years. Shark presence in coastal fjords occurred exclusively during the coastal ice-free period (July to November), regardless of the location of tagging or detection, while presence in the offshore was recorded during the period of ice re-formation and cover (November to July). Through multi-year telemetry, it was possible to reveal repetitive patterns in broad-scale habitat use for a complex marine predator with direct relevance for understanding the seasonal distribution of mobile Arctic consumers and informing regional fisheries management. |
format |
Article in Journal/Newspaper |
author |
Jena E. Edwards Kevin J. Hedges Steven T. Kessel Nigel E. Hussey |
author_facet |
Jena E. Edwards Kevin J. Hedges Steven T. Kessel Nigel E. Hussey |
author_sort |
Jena E. Edwards |
title |
Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
title_short |
Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
title_full |
Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
title_fullStr |
Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
title_full_unstemmed |
Multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of Greenland sharks (Somniosus microcephalus) |
title_sort |
multi-year acoustic tracking reveals transient movements, recurring hotspots, and apparent seasonality in the coastal-offshore presence of greenland sharks (somniosus microcephalus) |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.902854 https://doaj.org/article/e27794ebb94b4819b456c0fcf0331bda |
long_lat |
ENVELOPE(-66.014,-66.014,65.334,65.334) ENVELOPE(-82.895,-82.895,76.418,76.418) |
geographic |
Arctic Nunavut Baffin Bay Greenland Cumberland Sound Grise Fiord |
geographic_facet |
Arctic Nunavut Baffin Bay Greenland Cumberland Sound Grise Fiord |
genre |
Arctic Baffin Bay Baffin Bay Baffin Cumberland Sound Greenland Grise Fiord Nunavut Somniosus microcephalus |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Cumberland Sound Greenland Grise Fiord Nunavut Somniosus microcephalus |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.902854/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.902854 https://doaj.org/article/e27794ebb94b4819b456c0fcf0331bda |
op_doi |
https://doi.org/10.3389/fmars.2022.902854 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766326601725771776 |