Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination
Saimaa ringed seal (Phoca hispida saimensis) is an endangered subspecies living landlocked in Lake Saimaa, southeastern Finland. One of the major threats of this small population (ca 370 seals) is by-catch due to mainly recreational gill net fishing. For mitigating by-catch mortality varied fishing...
Published in: | Proceedings of the 5th European Congress of Conservation Biology |
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Open Science Centre, University of Jyväskylä
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ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/61962 2023-05-15T17:58:45+02:00 Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination Niemi, Marja Auttila, Miina Sipilä, Tero Kunnasranta, Mervi 2018 text/html fulltext https://doi.org/10.17011/conference/eccb2018/107535 http://urn.fi/ eng eng Open Science Centre, University of Jyväskylä https://peerageofscience.org/conference/eccb2018/107535/ ECCB2018: 5th European Congress of Conservation Biology. 12th - 15th of June 2018, Jyväskylä, Finland Niemi, M., Auttila, M., Sipilä, T. and Kunnasranta, M. (2018). Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination. 5th European Congress of Conservation Biology. doi:10.17011/conference/eccb2018/107535 doi:10.17011/conference/eccb2018/107535 http://urn.fi/ CC BY 4.0 © the Authors, 2018 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Article http://purl.org/eprint/type/ConferenceItem conference paper not in proceedings publishedVersion conferenceObject 2018 ftjyvaeskylaenun https://doi.org/10.17011/conference/eccb2018/107535 2021-09-23T20:25:47Z Saimaa ringed seal (Phoca hispida saimensis) is an endangered subspecies living landlocked in Lake Saimaa, southeastern Finland. One of the major threats of this small population (ca 370 seals) is by-catch due to mainly recreational gill net fishing. For mitigating by-catch mortality varied fishing closures and restrictions have been established in the lake over time. The fishing restrictions cover year round ban of the most dangerous fishing methods and springtime (15.4.-30.6.) gill net ban to protect especially the pups. In this study, we describe the usage of accurate spatial ecology data of the Saimaa ringed seals as a base for conservation measures. Telemetry tracking data of both; juveniles and adults (N= 41) together with the lair and haul out locations were used to determine the key distribution area for conservation measures. Radius of average home range (5.2 km) is buffered over known lair and haul out sites, to create overall occurrence area of the seals. The distribution area usage of the seals indicate that the seals occur almost all of lake surface area. This method approach was already utilized by government Decree (259/2016), and now closures are covering spatially ca. 60% of the lake surface area (4 400 km2). However, bycatch mortality still exists, which indicate that closures are inadequate and whole distribution area would need more fishing closures. Furthermore, the temporal gill net ban is underestimated as nowadays the by-catch mortality takes place outside the temporal ban. peerReviewed Article in Journal/Newspaper Phoca hispida ringed seal JYX - Jyväskylä University Digital Archive Lair ENVELOPE(-61.040,-61.040,-62.618,-62.618) Proceedings of the 5th European Congress of Conservation Biology |
institution |
Open Polar |
collection |
JYX - Jyväskylä University Digital Archive |
op_collection_id |
ftjyvaeskylaenun |
language |
English |
description |
Saimaa ringed seal (Phoca hispida saimensis) is an endangered subspecies living landlocked in Lake Saimaa, southeastern Finland. One of the major threats of this small population (ca 370 seals) is by-catch due to mainly recreational gill net fishing. For mitigating by-catch mortality varied fishing closures and restrictions have been established in the lake over time. The fishing restrictions cover year round ban of the most dangerous fishing methods and springtime (15.4.-30.6.) gill net ban to protect especially the pups. In this study, we describe the usage of accurate spatial ecology data of the Saimaa ringed seals as a base for conservation measures. Telemetry tracking data of both; juveniles and adults (N= 41) together with the lair and haul out locations were used to determine the key distribution area for conservation measures. Radius of average home range (5.2 km) is buffered over known lair and haul out sites, to create overall occurrence area of the seals. The distribution area usage of the seals indicate that the seals occur almost all of lake surface area. This method approach was already utilized by government Decree (259/2016), and now closures are covering spatially ca. 60% of the lake surface area (4 400 km2). However, bycatch mortality still exists, which indicate that closures are inadequate and whole distribution area would need more fishing closures. Furthermore, the temporal gill net ban is underestimated as nowadays the by-catch mortality takes place outside the temporal ban. peerReviewed |
format |
Article in Journal/Newspaper |
author |
Niemi, Marja Auttila, Miina Sipilä, Tero Kunnasranta, Mervi |
spellingShingle |
Niemi, Marja Auttila, Miina Sipilä, Tero Kunnasranta, Mervi Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
author_facet |
Niemi, Marja Auttila, Miina Sipilä, Tero Kunnasranta, Mervi |
author_sort |
Niemi, Marja |
title |
Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
title_short |
Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
title_full |
Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
title_fullStr |
Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
title_full_unstemmed |
Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination |
title_sort |
accurate spatial ecology of endangered saimaa ringed seals as a base for fishing closure determination |
publisher |
Open Science Centre, University of Jyväskylä |
publishDate |
2018 |
url |
https://doi.org/10.17011/conference/eccb2018/107535 http://urn.fi/ |
long_lat |
ENVELOPE(-61.040,-61.040,-62.618,-62.618) |
geographic |
Lair |
geographic_facet |
Lair |
genre |
Phoca hispida ringed seal |
genre_facet |
Phoca hispida ringed seal |
op_relation |
https://peerageofscience.org/conference/eccb2018/107535/ ECCB2018: 5th European Congress of Conservation Biology. 12th - 15th of June 2018, Jyväskylä, Finland Niemi, M., Auttila, M., Sipilä, T. and Kunnasranta, M. (2018). Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination. 5th European Congress of Conservation Biology. doi:10.17011/conference/eccb2018/107535 doi:10.17011/conference/eccb2018/107535 http://urn.fi/ |
op_rights |
CC BY 4.0 © the Authors, 2018 openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17011/conference/eccb2018/107535 |
container_title |
Proceedings of the 5th European Congress of Conservation Biology |
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1766167442462081024 |