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首页> 外文期刊>Canadian Journal of Zoology >Physical factors affecting the relative abundance of native and invasive amphipods in the St. Lawrence River
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Physical factors affecting the relative abundance of native and invasive amphipods in the St. Lawrence River

机译：物理因素影响圣劳伦斯河本地和入侵两栖动物的相对丰度

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摘要

The Ponto-Caspian amphipod Echinogammarus ischnus (Stebbing, 1899) is reportedly replacing the North American amphipod Gammarus fasciatus Say, 1818, in the lower Great Lakes, but the two species appear to coexist in the upper St. Lawrence River several years after invasion by E. ischnus. A multi-site survey in the river between Lake Ontario and Montreal (Quebec) found that E. ischnus and G. fasciatus respond differently to substrate characteristics, water chemistry variables, and current velocity. Both species increase in abundance in the presence of dreissenid mussels. However, E. ischnus density is positively correlated with current velocity and an increasing proportion of gravel-sized sediment, while G. fasciatus density is positively correlatedwith benthic filamentous algal (Cladophora spp.) bio-mass, macrophyte biolnass, and pH. Habitat heterogeneity within the river may be promoting the coexistence of native and exotic amphipods by allowing them to segregate along physicochemical gradients.
机译：据报道，庞特-里海两栖类纲纲棘足纲纲目Echnogammarus ischnus（Stebbing，1899）取代了1818年北美五大湖下游的北美两栖纲纲纲格玛鲁斯筋膜纲，但在入侵数年后，这两种物种似乎共存于圣劳伦斯河上部E. ischnus。在安大略湖和蒙特利尔（魁北克）之间的一条河中进行的一项多点调查发现，伊希氏菌和fasciatus对底物特征，水化学变量和流速的反应不同。在苔藓类贻贝的存在下，这两种物种的丰度都增加了。然而，伊斯氏肠杆菌密度与当前速度和砾石大小沉积物比例的增加呈正相关，而fasciatus密度与底栖丝状藻类生物量，大型植物生物质和pH呈正相关。河流中的生境异质性可能通过允许它们沿理化梯度分离而促进了本地和外来两栖动物的共存。

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