Specific Niche Characteristics Facilitate the Invasion of an Alien Fish Invader in Boreal Streams
Specific Niche Characteristics Facilitate the Invasion of an Alien Fish Invader in Boreal Streams
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特定的生态位特征有助于外来鱼类入侵者入侵北方溪流
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
T. Muotka
中科院分区：
文献类型：
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作者：
K. Korsu;J. Heino;A. Huusko;T. Muotka
我们研究了生态位关系的本地流鱼和外来入侵者，溪鳟鱼（红点鲑fontinalis），以检查如果溪鳟鱼位于一个未充分利用的环境生态位在我们的北方研究系统。在这两个研究年（1994年与2004年），我们发现溪鳟鱼有最边缘的生态位的所有鱼类物种的检查。影响溪鳟分布的最重要的环境变量是pH值，与酸性源头网站被占主导地位的这一物种。相比之下，褐鳟鱼，相对非边缘生态位，发生在平均条件下，整个采样点。其他鱼类的生态位位置之间的两个鲑。我们的研究结果表明，鱼类入侵可能会大大促进了次优占据的环境生态位空间的存在，在收件人河流系统。
We studied the ecological niche relations of native stream fish and an alien invader, brook trout (Salvelinus fontinalis), to examine if brook trout had located an underused environmental niche in our boreal study system. In both study years (1994 versus 2004), we found brook trout to have the most marginal niche position of all the fish species examined. The most important environmental variable affecting the distribution of brook trout was pH, with acid headwater sites being dominated by this species. Brown trout, in contrast, had relatively nonmarginal niche, occurring in average conditions across the sampled sites. Other fish species had niche positions between the two salmonids. Our results show that fish invasions may be strongly facilitated by the presence of suboptimally occupied environmental niche space in the recipient river system.