Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring?
Hunter-collected data and samples are used as indices of population performance, and monitoring programs often take advantage of such data as ecological indicators. Here, we establish the relationships between measures of skeleton size (lower jawbone length and hind-leg length) and autumn carcass ma...
Published in: | European Journal of Wildlife Research |
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Online Access: | https://hdl.handle.net/11250/3087412 https://doi.org/10.1007/s10344-022-01636-0 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/3087412 2023-10-01T03:53:59+02:00 Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? Pedersen, Åshild Ønvik Bårdsen, Bård-Jørgen Veiberg, Vebjørn Irvine, Justin R Hansen, Brage Bremset 2023 application/pdf https://hdl.handle.net/11250/3087412 https://doi.org/10.1007/s10344-022-01636-0 eng eng Springer https://link.springer.com/article/10.1007/s10344-022-01636-0#citeas Norges forskningsråd: 276080 Norges forskningsråd: 223257 urn:issn:1612-4642 https://hdl.handle.net/11250/3087412 https://doi.org/10.1007/s10344-022-01636-0 cristin:2064574 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no 69 European Journal of Wildlife Research 1 VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Peer reviewed Journal article 2023 ftntnutrondheimi https://doi.org/10.1007/s10344-022-01636-0 2023-09-06T22:46:26Z Hunter-collected data and samples are used as indices of population performance, and monitoring programs often take advantage of such data as ecological indicators. Here, we establish the relationships between measures of skeleton size (lower jawbone length and hind-leg length) and autumn carcass mass of slaughtered individuals of known age and sex of the high Arctic and endemic Svalbard reindeer (Rangifer tarandus platyrhynchus). We assess these relationships using a long-term monitoring dataset derived from hunted or culled reindeer. The two skeleton measures were generally strongly correlated within age class. Both jaw length (R2 = 0.78) and hind-leg length (R2 = 0.74) represented good proxies of carcass mass. These relationships were primarily due to an age effect (i.e. due to growth) as the skeleton measures reached an asymptotic size at 4–6 years of age. Accordingly, strong positive correlations between skeleton measures and carcass mass were mainly evident at the young age classes (range r [0.45–0.84] for calves and yearlings). For the adults, these relationships weakened due to skeletal growth ceasing in mature animals causing increased variance in mass with age—potentially due to the expected substantial impacts of annual environmental fluctuations. As proxies for carcass mass, skeleton measurements should therefore be limited to young individuals. Although body mass is the ‘gold standard’ in monitoring large herbivores, our results indicate that skeleton measures collected by hunters only provide similar valuable information for young age classes, particularly calves and yearlings. In sum, jaw length and hind-leg length function as proxies identical to body mass when documenting the impacts of changing environmental conditions on important state variables for reindeer and other herbivores inhabiting highly variable environments. Arctic · Citizen science · Hunter-collected data · Life history · Terrestrial large herbivore Hunting for ecological indicators: are large herbivore skeleton measures from ... Article in Journal/Newspaper Arctic Rangifer tarandus Rangifer tarandus platyrhynchus Svalbard svalbard reindeer NTNU Open Archive (Norwegian University of Science and Technology) Arctic Svalbard European Journal of Wildlife Research 69 1 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
spellingShingle |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Pedersen, Åshild Ønvik Bårdsen, Bård-Jørgen Veiberg, Vebjørn Irvine, Justin R Hansen, Brage Bremset Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
topic_facet |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
description |
Hunter-collected data and samples are used as indices of population performance, and monitoring programs often take advantage of such data as ecological indicators. Here, we establish the relationships between measures of skeleton size (lower jawbone length and hind-leg length) and autumn carcass mass of slaughtered individuals of known age and sex of the high Arctic and endemic Svalbard reindeer (Rangifer tarandus platyrhynchus). We assess these relationships using a long-term monitoring dataset derived from hunted or culled reindeer. The two skeleton measures were generally strongly correlated within age class. Both jaw length (R2 = 0.78) and hind-leg length (R2 = 0.74) represented good proxies of carcass mass. These relationships were primarily due to an age effect (i.e. due to growth) as the skeleton measures reached an asymptotic size at 4–6 years of age. Accordingly, strong positive correlations between skeleton measures and carcass mass were mainly evident at the young age classes (range r [0.45–0.84] for calves and yearlings). For the adults, these relationships weakened due to skeletal growth ceasing in mature animals causing increased variance in mass with age—potentially due to the expected substantial impacts of annual environmental fluctuations. As proxies for carcass mass, skeleton measurements should therefore be limited to young individuals. Although body mass is the ‘gold standard’ in monitoring large herbivores, our results indicate that skeleton measures collected by hunters only provide similar valuable information for young age classes, particularly calves and yearlings. In sum, jaw length and hind-leg length function as proxies identical to body mass when documenting the impacts of changing environmental conditions on important state variables for reindeer and other herbivores inhabiting highly variable environments. Arctic · Citizen science · Hunter-collected data · Life history · Terrestrial large herbivore Hunting for ecological indicators: are large herbivore skeleton measures from ... |
format |
Article in Journal/Newspaper |
author |
Pedersen, Åshild Ønvik Bårdsen, Bård-Jørgen Veiberg, Vebjørn Irvine, Justin R Hansen, Brage Bremset |
author_facet |
Pedersen, Åshild Ønvik Bårdsen, Bård-Jørgen Veiberg, Vebjørn Irvine, Justin R Hansen, Brage Bremset |
author_sort |
Pedersen, Åshild Ønvik |
title |
Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
title_short |
Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
title_full |
Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
title_fullStr |
Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
title_full_unstemmed |
Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
title_sort |
hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? |
publisher |
Springer |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3087412 https://doi.org/10.1007/s10344-022-01636-0 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Rangifer tarandus Rangifer tarandus platyrhynchus Svalbard svalbard reindeer |
genre_facet |
Arctic Rangifer tarandus Rangifer tarandus platyrhynchus Svalbard svalbard reindeer |
op_source |
69 European Journal of Wildlife Research 1 |
op_relation |
https://link.springer.com/article/10.1007/s10344-022-01636-0#citeas Norges forskningsråd: 276080 Norges forskningsråd: 223257 urn:issn:1612-4642 https://hdl.handle.net/11250/3087412 https://doi.org/10.1007/s10344-022-01636-0 cristin:2064574 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_doi |
https://doi.org/10.1007/s10344-022-01636-0 |
container_title |
European Journal of Wildlife Research |
container_volume |
69 |
container_issue |
1 |
_version_ |
1778521090194145280 |