Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo)
Over the last hundred years, many large carnivore species have suffered range contractions, population losses, and habitat alterations that may be influencing their dietary preferences. To identify shifting isotopic niches and reconstruct past and present diets from species of high conservation conc...
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ftluke:oai:jukuri.luke.fi:10024/554037 2024-02-11T10:04:31+01:00 Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) Massé, Clément F. Hiltunen, Tamara A. Lansink, Gerhardus M. J. Holmala, Katja Isomursu, Marja Kojola, Ilpo Aspi, Jouni Welker, Jeffery M. orcid:0000-0002-1346-4475 4100610210 4100110810 Luonnonvarakeskus 11 p. true https://jukuri.luke.fi/handle/10024/554037 en eng Frontiers Media SA Frontiers in Ecology and Evolution 10.3389/fevo.2023.1284901 2296-701X 11 1284901. https://jukuri.luke.fi/handle/10024/554037 URN:NBN:fi-fe20231116147049 CC BY 4.0 stable isotope analysis SIA large carnivores diet switch diet niche isotopic niche publication fi=A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä|sv=A1 Originalartikel i en vetenskaplig tidskrift|en=A1 Journal article (refereed), original research| fi=Publisher's version|sv=Publisher's version|en=Publisher's version| ftluke 2024-01-25T00:07:24Z Over the last hundred years, many large carnivore species have suffered range contractions, population losses, and habitat alterations that may be influencing their dietary preferences. To identify shifting isotopic niches and reconstruct past and present diets from species of high conservation concern, stable isotope analysis (SIA) of δ13C and δ15N values of tissue from museum collections and ongoing non-invasive monitoring programs offers an effective approach. Here, we assessed the long-term alterations in the trophic structure of a generalist large carnivore over a time of population loss and recovery. Wolverine stable carbon (δ13C) and nitrogen (δ15N) isotopes were measured in hair samples collected from 44 individuals in Finland for the period 1905–2020, and potential dietary were quantified using isotopic niche metrics shifts in two study areas. We provide evidence of a long-term diet shift in Finnish wolverines, with a temporal depletion of hair’s δ13C (β = −0.016‰, R² = 0.46, p < 0.001). Correspondingly, there was a shift in the isotopic niches of the Historical population (before the year 2000) and Recent population (after 2000), with the niche overlap between the Historical and Recent periods being only 33% throughout Finland, and even lower in the two study areas (22% to 24%). The breadth of the isotopic niche, however, did not significantly differ between the two periods, suggesting that despite a change in diet composition, wolverines did not specialize more. The trophic level of wolverines in Finland was stable throughout the study period, with no significant change in δ15N with time (β = 0.0055‰, R² = 0.043, p = 0.17). In summary: A) the strong trophic resilience of this top predator was shown by the stability of its niche breadth and trophic level feeding regime during periods of population decline and recovery as well as during a period of major anthropogenic alterations in their environment; B) the use of SIA methods on historical and recent hairs provided a unique tool to unravel long-term ... Article in Journal/Newspaper Gulo gulo Natural Resources Institute Finland: Jukuri |
institution |
Open Polar |
collection |
Natural Resources Institute Finland: Jukuri |
op_collection_id |
ftluke |
language |
English |
topic |
stable isotope analysis SIA large carnivores diet switch diet niche isotopic niche |
spellingShingle |
stable isotope analysis SIA large carnivores diet switch diet niche isotopic niche Massé, Clément F. Hiltunen, Tamara A. Lansink, Gerhardus M. J. Holmala, Katja Isomursu, Marja Kojola, Ilpo Aspi, Jouni Welker, Jeffery M. Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
topic_facet |
stable isotope analysis SIA large carnivores diet switch diet niche isotopic niche |
description |
Over the last hundred years, many large carnivore species have suffered range contractions, population losses, and habitat alterations that may be influencing their dietary preferences. To identify shifting isotopic niches and reconstruct past and present diets from species of high conservation concern, stable isotope analysis (SIA) of δ13C and δ15N values of tissue from museum collections and ongoing non-invasive monitoring programs offers an effective approach. Here, we assessed the long-term alterations in the trophic structure of a generalist large carnivore over a time of population loss and recovery. Wolverine stable carbon (δ13C) and nitrogen (δ15N) isotopes were measured in hair samples collected from 44 individuals in Finland for the period 1905–2020, and potential dietary were quantified using isotopic niche metrics shifts in two study areas. We provide evidence of a long-term diet shift in Finnish wolverines, with a temporal depletion of hair’s δ13C (β = −0.016‰, R² = 0.46, p < 0.001). Correspondingly, there was a shift in the isotopic niches of the Historical population (before the year 2000) and Recent population (after 2000), with the niche overlap between the Historical and Recent periods being only 33% throughout Finland, and even lower in the two study areas (22% to 24%). The breadth of the isotopic niche, however, did not significantly differ between the two periods, suggesting that despite a change in diet composition, wolverines did not specialize more. The trophic level of wolverines in Finland was stable throughout the study period, with no significant change in δ15N with time (β = 0.0055‰, R² = 0.043, p = 0.17). In summary: A) the strong trophic resilience of this top predator was shown by the stability of its niche breadth and trophic level feeding regime during periods of population decline and recovery as well as during a period of major anthropogenic alterations in their environment; B) the use of SIA methods on historical and recent hairs provided a unique tool to unravel long-term ... |
author2 |
orcid:0000-0002-1346-4475 4100610210 4100110810 Luonnonvarakeskus |
format |
Article in Journal/Newspaper |
author |
Massé, Clément F. Hiltunen, Tamara A. Lansink, Gerhardus M. J. Holmala, Katja Isomursu, Marja Kojola, Ilpo Aspi, Jouni Welker, Jeffery M. |
author_facet |
Massé, Clément F. Hiltunen, Tamara A. Lansink, Gerhardus M. J. Holmala, Katja Isomursu, Marja Kojola, Ilpo Aspi, Jouni Welker, Jeffery M. |
author_sort |
Massé, Clément F. |
title |
Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
title_short |
Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
title_full |
Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
title_fullStr |
Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
title_full_unstemmed |
Long-term dietary shifts in a generalist predator, the wolverine (Gulo gulo) |
title_sort |
long-term dietary shifts in a generalist predator, the wolverine (gulo gulo) |
publisher |
Frontiers Media SA |
url |
https://jukuri.luke.fi/handle/10024/554037 |
genre |
Gulo gulo |
genre_facet |
Gulo gulo |
op_relation |
Frontiers in Ecology and Evolution 10.3389/fevo.2023.1284901 2296-701X 11 1284901. https://jukuri.luke.fi/handle/10024/554037 URN:NBN:fi-fe20231116147049 |
op_rights |
CC BY 4.0 |
_version_ |
1790601151244140544 |