Assessing the long-term causal effect of trout invasion on a native charr
Assessing the long-term causal effect of trout invasion on a native charr
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评估鳟鱼入侵对本地红点鲑的长期因果影响
DOI：
10.1016/j.ecolind.2017.12.058
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发表时间：
2018
影响因子：
6.9
通讯作者：
K. Morita
中科院分区：
文献类型：
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作者：
K. Morita
许多研究表明，入侵物种可以通过种间竞争导致本地物种的减少。在淡水生态系统中，褐鳟鱼（萨尔莫trutta）和虹鳟鱼（虹鳟鱼mykiss）已被牵连在减少本地物种，特别是同类鲑鱼。然而，在野外证明因果关系是有问题的，因为在原住民被其他环境变化消灭的地区，非原住民可能会取代原住民。使用最近开发的技术多空间收敛交叉映射（CCM）和长期监测数据集（2002-2017年）与空间复制引进和本地鲑鱼在日本流，我测试是否增加非本地鳟鱼造成本地charr（红点鲑leucomaenis）减少。随着时间的推移，本地charr减少其人口密度与非本地的褐鳟鱼和虹鳟鱼。优势物种从2002年的本地红点鲑（64%）到2017年的非本地鳟鱼（97%）。多空间CCM确定显着的因果强迫本地charr虹鳟鱼和褐鳟鱼，贷款支持的假设位移，而不是替换，本地物种的非本地物种。因此，这些结果表明，消灭入侵的鳟鱼物种可能有助于恢复该地区的本地charr。
Many studies have indicated that invasive species can drive declines in native species through interspecific competition. In freshwater ecosystems, brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) have been implicated in reducing native species, especially congeneric salmonid fishes. However, demonstrating causality in the wild is problematic because non-natives might replace natives in areas where the former were extirpated by other environmental changes. Using the recently developed technique of multispatial convergent cross mapping (CCM) and a long-term monitoring data set (2002–2017) with spatial replication on both introduced and native salmonids in a Japanese stream, I tested whether an increase in non-native trout caused a decrease in native charr (Salvelinus leucomaenis). Native charr decreased their population density over time in contrast to the non-native brown trout and rainbow trout. The dominant species changed from native charr (64%) in 2002 to non-native trout (97%) by 2017. Multispatial CCM identified significant causal forcing of the native charr by both rainbow trout and brown trout, lending support for the hypothesis of displacement, rather than replacement, of a native species by non-native species. These results therefore suggest that eradicating the invasive trout species may aid the recovery of native charr in the region.