Accurate spatial ecology of endangered Saimaa ringed seals as a base for fishing closure determination
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
© the Authors, 2018
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. ...
PublisherOpen Science Centre, University of Jyväskylä
ConferenceECCB2018: 5th European Congress of Conservation Biology. 12th - 15th of June 2018, Jyväskylä, Finland
MetadataShow full item record
- ECCB 2018 
Showing items with similar title or keywords.
Contemporary spatial and environmental factors determine vascular plant species richness on highly fragmented meadows in Central Finland Raatikainen, Kaisa; Oldén, Anna; Käyhkö, Niina; Mönkkönen, Mikko; Halme, Panu (Springer, 2018)Context Habitat loss is a major threat to biodiversity. It can create temporal lags in decline of species in relation to destruction of habitat coverage. Plant species specialized in semi-natural grasslands, ...
Haapanen, Mika (Jyväskylän yliopisto, 2003)This thesis consists of five empirical studies which seek to understand the processes behind interregional migration decisions and the spatial concentration of labour. The empirical studies are preceded by an introductory ...
Lee, Alexander; Cowlishaw, Guy (PeerJ Inc., 2017)When foraging in a social group, individuals are faced with the choice of sampling their environment directly or exploiting the discoveries of others. The evolutionary dynamics of this trade-off have been explored ...
Forest management optimization across spatial scales to reconcile economic and conservation objectives Pohjanmies, Tähti; Eyvindson, Kyle; Mönkkönen, Mikko (Public Library of Science, 2019)Conflicts between biodiversity conservation and resource production can be mitigated by multi-objective management planning. Optimizing management for multiple objectives over larger land areas likely entails trading off ...
Koerner, Sally E.; Smith, Melinda D.; Burkepile, Deron E.; Hanan, Niall P.; Avolio, Meghan L.; Collins, Scott L.; Knapp, Alan K.; Lemoine, Nathan P.; Forrestel, Elisabeth J.; Eby, Stephanie; Thompson, Dave I.; Aguado-Santacruz, Gerardo A.; Anderson, John P.; Anderson, T. Michael; Angassa, Ayana; Bagchi, Sumanta; Bakker, Elisabeth S.; Bastin, Gary; Baur, Lauren E.; Beard, Karen H.; Beever, Erik A.; Bohlen, Patrick J.; Boughton, Elizabeth H.; Canestro, Don; Cesa, Ariela; Chaneton, Enrique; Cheng, Jimin; D’Antonio, Carla M.; Deleglise, Claire; Dembélé, Fadiala; Dorrough, Josh; Eldridge, David J.; Fernandez-Going, Barbara; Fernández-Lugo, Silvia; Fraser, Lauchlan H.; Freedman, Bill; García-Salgado, Gonzalo; Goheen, Jacob R.; Guo, Liang; Husheer, Sean; Karembé, Moussa; Knops, Johannes M. H.; Kraaij, Tineke; Kulmatiski, Andrew; Kytöviita, Minna-Maarit; Lezama, Felipe; Loucougaray, Gregory; Loydi, Alejandro; Milchunas, Dan G.; Milton, Suzanne J.; Morgan, John W.; Moxham, Claire; Nehring, Kyle C.; Olff, Han; Palmer, Todd M.; Rebollo, Salvador; Riginos, Corinna; Risch, Anita C.; Rueda, Marta; Sankaran, Mahesh; Sasaki, Takehiro; Schoenecker, Kathryn A.; Schultz, Nick L.; Schütz, Martin; Schwabe, Angelika; Siebert, Frances; Smit, Christian; Stahlheber, Karen A.; Storm, Christian; Strong, Dustin J.; Su, Jishuai; Tiruvaimozhi, Yadugiri V.; Tyler, Claudia; Val, James; Vandegehuchte, Martijn L.; Veblen, Kari E.; Vermeire, Lance T.; Ward, David; Wu, Jianshuang; Young, Truman P.; Yu, Qiang; Zelikova, Tamara Jane (Nature Publishing Group, 2018)Herbivores alter plant biodiversity (species richness) in many of the world’s ecosystems, but the magnitude and the direction of herbivore effects on biodiversity vary widely within and among ecosystems. One current theory ...