Trophic structure of apex fish communities in closed versus leaky lakes of arctic Alaska
Trophic structure of apex fish communities in closed versus leaky lakes of arctic Alaska
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北极阿拉斯加封闭湖与漏湖湖中顶级鱼类群落的营养结构
DOI:
10.1007/s00442-020-04776-9
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发表时间:
2020
期刊:
影响因子:
2.7
通讯作者:
Budy, Phaedra
中科院分区:
文献类型:
--
作者:
Klobucar, Stephen L.;Budy, Phaedra
Despite low species diversity and primary production, trophic structure (e.g., top predator species, predator size) is surprisingly variable among Arctic lakes. We investigated trophic structure in lakes of arctic Alaska containing arctic charSalvelinus alpinususing stomach contents and stable isotope ratios in two geographically-close but hydrologically-distinct lake clusters to investigate how these fish may interact and compete for limited food resources. Aside from different lake connectivity patterns (‘leaky’ versus ‘closed’), differing fish communities (up to five versus only two species) between lake clusters allowed us to test trophic hypotheses including: (1) arctic char are more piscivorous, and thereby grow larger and obtain higher trophic positions, in the presence of other fish species; and, (2) between arctic char size classes, resource polymorphism is more prominent, and thereby trophic niches are narrower and overlap less, in the absence of other predators. Regardless of lake cluster, we observed little direct evidence of arctic char consuming other fishes, but char were larger (mean TL = 468 vs 264 mm) and trophic position was higher (mean TP = 4.0 vs 3.8 for large char) in lakes with other fishes. Further, char demonstrated less intraspecific overlap when other predators were present whereas niche overlap was up to 100% in closed, char only lakes. As hydrologic characteristics (e.g., lake connectivity, water temperatures) will change across the Arctic owing to climate change, our results provide insight regarding potential concomitant changes to fish interactions and increase our understanding of lake trophic structure to guide management and conservation goals.
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DOI:
10.1093/acprof:osobl/9780199860401.001.0001
发表时间:
2014
期刊:
Water-Resources Investigations Report
影响因子:
--
作者:
J. Hobbie;G. Kling
通讯作者:
G. Kling
影响因子:
6.5
作者:
F. Wrona;T. Prowse;J. Reist;J. Hobbie;L. Lévesque;W. Vincent
通讯作者:
W. Vincent
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
二瓶直登;田野井慶太朗;中西友子;二瓶直登;二瓶直登;二瓶直登;二瓶直登
通讯作者:
二瓶直登
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
F. Rigét;K. Nygaard;B. Christensen
通讯作者:
B. Christensen
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
K. Hindar;B. Jonsson
通讯作者:
B. Jonsson