Invaders induce coordinated isotopic niche shifts in native fish species

被引:27
作者
Rogosch, Jane S. [1 ,2 ]
Olden, Julian D. [1 ]
机构
[1] Univ Washington, Sch Aquat & Fishery Sci, 1122 NE Boat St, Seattle, WA 98105 USA
[2] Univ Missouri, Sch Nat Resources, Missouri Cooperat Fish & Wildlife Res, 1111 E Rollins St,302 ABNR, Columbia, MO 65211 USA
关键词
FOOD-WEB DYNAMICS; NONNATIVE FISHES; COLORADO RIVER; ECOLOGICAL IMPACTS; GREEN SUNFISH; BROOK TROUT; REMOVAL; RECOVERY; STREAMS; CONSEQUENCES;
D O I
10.1139/cjfas-2019-0346
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Food-web investigations inform management strategies by exposing potential interactions between native and nonnative species and anticipating likely outcomes associated with species removal efforts. We leveraged a natural gradient of compositional turnover from native-only to nonnative-only fish assemblages, combined with an intensive removal effort, to investigate underlying food-web changes in response to invasive species expansion in a Lower Colorado River tributary. Nonnative fishes caused coordinated isotopic niche displacement in native fishes by inducing resource shifts toward lower trophic positions and enriched carbon sources. By contrast, nonnative fishes did not experience reciprocal shifts when native fishes were present. Asymmetrical outcomes between native and nonnative fishes indicated species displacement may result from competitive or consumptive interactions. Native species' isotopic niches returned to higher trophic levels after nonnative green sunfish (Lepomis cyaneilus) removal, indicating removal efforts can support trophic recovery of native fishes like desert suckers (Catostomus cluricii) and roundtail chub (Gila robusta). Using stable isotope analysis in preremoval assessments provides opportunities to identify asymmetric interactions, whereas postremoval assessments could identify unintended consequences, like mesopredator release, as part of adaptive decision linking to recover native fishes.
引用
收藏
页码:1348 / 1358
页数:11
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