Ongoing localized extinctions of stream-dwelling white-spotted charr populations in small dammed-off habitats of Hokkaido Island, Japan
Ongoing localized extinctions of stream-dwelling white-spotted charr populations in small dammed-off habitats of Hokkaido Island, Japan
复制标题
日本北海道岛小型封闭栖息地的溪流白点红点鲑种群持续局部灭绝
DOI:
10.1007/s10750-019-3891-1
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发表时间:
2019
期刊:
影响因子:
2.6
通讯作者:
Hitoshi Araki
中科院分区:
文献类型:
--
作者:
Kentaro Morita;Genki Sahashi;Masaki Miya;Shouko Kamada;Takashi Kanbe;Hitoshi Araki
Habitat fragmentation caused by damming can greatly reduce the population viability of aquatic organisms, with smaller fragmented populations at higher risk of extinction due to increased demographic, genetic, and environmental stochasticity. However, empirical evidence demonstrating that smaller natural populations are more vulnerable to extinction is limited. We studied the vulnerability to extinction of white-spotted charr (Salvelinus leucomaenis) populations in 30 dammed-off streams in Oshima Peninsula, southwestern Hokkaido Island, Japan, by comparing the incidence of charr populations in streams between 1999 and 2014. Using electrofishing and environmental DNA surveys, we identified three localized extinctions, with the probability of extinction increasing with decreasing watershed area (our surrogate for habitat size). We also found a new population in one dammed-off stream in which white-spotted charr were previously unknown, after installation of a fish ladder, indicating the capacity of white-spotted charr to recolonize reconnected habitat in a short period. Our results suggest that localized extinction of white-spotted charr in small dammed-off streams is ongoing, but that appropriate fish migration corridors can reduce localized extinction risk and increase the probability of species persistence.
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影响因子:
13.6
作者:
Haddad NM;Brudvig LA;Clobert J;Davies KF;Gonzalez A;Holt RD;Lovejoy TE;Sexton JO;Austin MP;Collins CD;Cook WM;Damschen EI;Ewers RM;Foster BL;Jenkins CN;King AJ;Laurance WF;Levey DJ;Margules CR;Melbourne BA;Nicholls AO;Orrock JL;Song DX;Townshend JR
通讯作者:
Townshend JR
影响因子:
3.1
作者:
K. Morita;A. Yokota
通讯作者:
A. Yokota
影响因子:
6.9
作者:
L. Nathan;A. Smith;A. Welsh;J. Vokoun
通讯作者:
J. Vokoun
影响因子:
1.3
作者:
G. Wilde;Aaron C. Urbanczyk
通讯作者:
Aaron C. Urbanczyk
影响因子:
6.9
作者:
K. Morita
通讯作者:
K. Morita