当前位置: X-MOL 学术Oecologia › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Does ecological release from distantly related species affect phenotypic divergence in brook charr?
Oecologia ( IF 2.7 ) Pub Date : 2021-02-01 , DOI: 10.1007/s00442-020-04822-6
Vincent Rainville , Antoine Filion , Isabelle Lussier , Marc Pépino , Pierre Magnan

Ecological opportunity occurs when a resource becomes available through a decrease of interspecific competition and another species colonizes the vacant niche through phenotypic plasticity and intraspecific competition. Brook charr exhibit a resource polymorphism in some Canadian Shield lakes, where a littoral ecotype feeds mainly on zoobenthos and a pelagic ecotype feeds mostly on zooplankton. The objectives of this study were to test that (i) resource polymorphism is common in these brook charr populations, (ii) the presence creek chub and white sucker, two introduced species competing with brook charr for littoral resources, will decrease the phenotypic divergence between the two brook charr ecotypes, and (iii) the ecological release from introduced species will increase population and/or individual niche widths in brook charr. The study was based on 27 lakes and five indicators of resource use (stomach content, liver δ13C, muscle astaxanthin concentration, pyloric caecum length, and gill raker length). Our results indicate that within-lake differences in resource use by both ecotypes are common and stable through time. When facing interspecific competition, both littoral and pelagic brook charr incorporated more pelagic prey into their diet but maintained the amplitude of their differences in resource use, which contradicts our second prediction. Finally, we did not find any significant effect of introduced species on population and individual niche widths of brook charr. We suggest that the difference in feeding mode among distantly related competitors could prevent the complete exclusion of a species from a given niche and explain the lack of response to the ecological release.



中文翻译:

远缘物种的生态释放是否会影响布鲁克沙尔的表型差异?

当通过减少种间竞争获得资源而另一个物种通过表型可塑性和种内竞争将空缺的生态位殖民化时,就会出现生态机会。布鲁克·查尔在某些加拿大盾构湖中表现出资源多态性,其中沿岸生态型主要以浮游动物为食,而浮游生态型主要以浮游动物为食。这项研究的目的是测试(i)这些布鲁克沙尔族群中的资源多态性是常见的;(ii)与布鲁克沙尔族竞争滨海资源的两种引入物种小河和白吸盘的存在将减少它们之间的表型差异。这两种布鲁克·查尔生态型,以及(iii)引进物种的生态释放将增加布鲁克·查尔的种群和/或个体生态位宽度。13 C,肌肉虾青素浓度,幽门盲肠长度和g耙长度)。我们的结果表明,随着时间的推移,这两种生态型在湖内资源使用上的差异是普遍且稳定的。当面临种间竞争时,沿岸和远洋布鲁克沙尔都将更多的远洋猎物纳入其饮食,但保持了资源利用差异的幅度,这与我们的第二个预测相矛盾。最后,我们没有发现引入物种对布鲁克沙尔的种群和个体生态位宽度的任何显着影响。我们建议,在远亲之间竞争者之间的进食方式的差异可能会阻止物种从给定的生态位中完全排除,并解释了对生态释放缺乏反应的原因。

更新日期:2021-02-01
down
wechat
bug