Round goby and mottled sculpin predation on lake trout eggs and fry: Field predictions from laboratory experiments
Round goby and mottled sculpin predation on lake trout eggs and fry: Field predictions from laboratory experiments
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DOI：
10.1016/s0380-1330(99)70714-8
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发表时间：
1999-01-01
影响因子：
2.2
通讯作者：
Marsden, JE
中科院分区：
文献类型：
--
作者：
Chotkowski, MA;Marsden, JE
圆虾虎鱼（Neogobius melanostomus）意外引入北美五大湖引起了人们对其潜在影响的担忧；关于当地的动物群。虾虎鱼与斑驳鱼（Cottus bairdi）和黏糊糊的鱼（C. cognatus）有着相似的栖息地和产卵要求，并且可能已经在物种重叠的地方取代了雕刻鱼。像雕塑一样，虾虎鱼能够穿透间隙获取食物，因此可能成为间隙孵化湖鳟鱼卵的捕食者。进行了实验室实验，比较圆形虾虎鱼和斑纹虾虎鱼的卵消耗率和临界尺寸（鱼能够摄入卵的最小尺寸）。在两个等级的基质（鹅卵石和砾石）中，还研究了两种物种和湖鳟鱼卵和鱼苗的捕食情况。斑驳的雕刻鱼比同样大小的圆虾虎鱼吃掉更多的卵，并且能够吃掉比虾虎鱼更小的卵。虾虎鱼和石雕鱼在较小的基质（砾石）上的觅食成功率都低于鹅卵石。目前，在五大湖地区，虾虎鱼的密度比雕刻鱼要高。圆形虾虎鱼和斑纹虾虎鱼对湖鳟鱼卵的类似捕食，以及在五大湖一些地点实现的高密度虾虎鱼，导致圆形虾虎鱼可能对湖外繁殖产生负面影响，从而影响湖泊的恢复。
The accidental introduction of round gobies (Neogobius melanostomus) into the North American Great Lakes has raised concerns about their potential impacts;on local fauna. Gobies have similar habitat and spawning requirements to mottled sculpins (Cottus bairdi) and slimy sculpins (C. cognatus), and may already be displacing sculpins where the ranges of the species overlap. Like sculpins, gobies are capable of penetrating interstitial spaces to acquire food, and therefore may become predators of interstitially incubating lake trout eggs. Laboratory experiments were conducted to compare egg consumption rates and critical size (the minimum size at which a fish was capable of ingesting an egg) between round gobies and mottled sculpins. Predation by both species an lake trout eggs and fry was also examined in two grades of substrate (cobble and gravel). Mottled sculpins consumed larger numbers of eggs than round gobies of similar size, and were capable of ingesting eggs at smaller sizes than gobies. Both gobies and sculpins had lower foraging success on smaller substrates (gravel) than on cobble. Gobies are currently present at higher densities than sculpins in areas where they are established in the Great Lakes. The similar predation of lake trout eggs by round gobies and mottled sculpin and high densities the goby has achieved at some Great Lakes sites leads to the prediction that the round goby may negatively affect lake tr-out reproduction and therefore rehabilitation.