共查询到2条相似文献,搜索用时 0 毫秒
1.
Reproductive interactions between native and non-native species of fish have received little attention compared to other types of interactions such as predation or competition for food and habitat. We studied the reproductive interactions between non-native brook trout (Salvelinus fontinalis) and native brown trout (Salmo trutta) in a Pyrenees Mountain stream (SW France). We found evidence of significant interspecific interactions owing to consistent spatial and temporal overlap in redd localizations and spawning periods. We observed mixed spawning groups composed of the two species, interspecific subordinate males, and presence of natural hybrids (tiger trout). These reproductive interactions could be detrimental to the reproduction success of both species. Our study shows that non-native species might have detrimental effects on native species via subtle hybridization behavior. 相似文献
2.
Non-native brook trout have become widely established in North European streams. We combined evidence from an artificial-stream
experiment and drainage-scale field surveys to examine whether brook trout suppressed the growth of the native brown trout
(age 0 to age 2). Our experimental results demonstrated that brown trout were unaffected by the presence of brook trout but
that brook trout showed reduced growth in the presence of brown trout. However, the growth reduction only appeared in the
experimental setting, indicating that the reduced spatial constraint of the experimental system may have forced the fish to
unnaturally intense interactions. Indeed, in the field, no effect of either species on the growth of the putative competitor
was detected. These results caution against uncritical acceptance of findings from small-scale experiments because they rarely
scale up to more complex field situations. This and earlier work suggest that the establishment of brook trout in North European
streams has taken place mainly because of the availability of unoccupied (or underutilized) niche space, rather than as a
result of species trait combinations or interspecific competition per se.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献