Abstract Age-0 lake whitefish Coregonus clupeaformis stomachs from western Lake Huron were examined in 2018 to evaluate spatial variation in feeding ecology. Overall, age-0 lake whitefish had narrow diet niches and similar feeding strategies across sites in western Lake Huron, with all sizes of age-0 lake whitefish specializing on one prey at each site, with some other prey eaten occasionally by most individuals as fish grew at some sites. Although prey selectivity and the dominant prey types varied among sites, feeding success was generally similar among sites for most sizes of fish. For fish collected in neuston nets (13–21 mm), food biomass per fish did not differ between Saginaw Bay and Thunder Bay for fish that had lost their yolk sac even though cyclopoid copepods were selected in Saginaw Bay and calanoid copepods were selected in Thunder Bay, suggesting that the type of copepod available to early stage age-0 lake whitefish might not be as important as previously thought. Fish from beach seines (20–51 mm) also had a narrow diet niche with a fair degree of diet specialization on calanoids, cyclopoids, or Bosmina, depending on site, along with generalized feeding on chironomid pupae at some sites. Selectivity patterns on zooplankton prey by larger age-0 fish followed patterns in prey availability, indicating the ability to adapt to prevailing prey conditions. Despite these spatial differences in prey importance, most fish had food in their stomachs and food biomass per fish did not differ among sites for most size groups, suggesting that variable diet patterns might not result in differential conditions for growth or survival of age age-0 lake whitefish. Adaptability in prey use might not entirely buffer age-0 lake whitefish from environmental variability, as we noted strong differences in both diet composition and feeding success among years (2014–2018) at the Monaghan Point site.

中文翻译：

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休伦湖 0 龄湖白鱼 Coregonus clupeaformis 摄食生态的空间变异

摘要 2018 年对休伦湖西部的 0 岁湖白鱼 Coregonus clupeaformis 胃进行了研究，以评估摄食生态的空间变化。总体而言，0 岁湖白鱼在休伦湖西部的各个地点具有狭窄的饮食生态位和类似的饲养策略，各种大小的 0 岁湖白鱼在每个地点专门捕食一种猎物，大多数人偶尔​​会吃一些其他猎物作为鱼在某些站点增长。尽管不同地点的猎物选择性和主要猎物类型各不相同，但对于大多数大小的鱼，摄食成功率在不同地点之间大致相似。对于在 neuston 网（13-21 毫米）中收集的鱼，尽管在 Saginaw Bay 和 Thunder Bay 选择了旋足类桡足类，但在 Saginaw Bay 和 Thunder Bay 之间，对于失去卵黄囊的鱼类，每条鱼的食物生物量没有差异，这表明早期可用的桡足类类型-0 湖白鱼可能不像以前想象的那么重要。来自海滩围网（20-51 毫米）的鱼也有一个狭窄的饮食生态位，根据地点的不同，饮食专业化程度相当高，以海藻类、环类动物或 Bosmina 为食，并在某些地点普遍以摇蚊蛹为食。较大的 0 岁鱼对浮游动物猎物的选择性模式遵循猎物可用性的模式，表明能够适应普遍的猎物条件。尽管猎物重要性存在这些空间差异，大多数鱼的胃里都有食物，而且每条鱼的食物生物量在大多数体型组的不同地点没有差异，这表明不同的饮食模式可能不会导致 0 岁湖白鱼的生长或存活条件不同。猎物使用的适应性可能无法完全缓冲 0 岁湖白鱼不受环境变化的影响，因为我们注意到在 Monaghan Point 站点的几年（2014-2018 年）的饮食组成和喂养成功率存在很大差异。