Abstract Two of the remaining coregonine species in Lake Ontario, cisco (Coregonus artedi) and lake whitefish (C. clupeaformis), spawn in Chaumont Bay, New York. Larvae co-occur in the spring but are difficult to distinguish morphologically. We applied genetic species identification using microsatellite DNA loci of 268 larvae from known locations in nearshore and offshore habitats in Chaumont Bay to determine the extent of mixing of these species in each habitat. Cisco dominated the larvae (95%) in offshore habitats and lake whitefish dominated (84%) in nearshore habitats, where seven of eight putative hybrids occurred. Habitat segregation between these two species at the larval stage has implications for productivity estimates, as changing environmental conditions may differentially affect shallow and deep waters, larval survival, and possibly subsequent recruitment. Discrimination between cisco and lake whitefish larvae will help to characterize habitat and basic life history needs and to focus research collections. Genetic species identification should be applied to larger samples of larvae to evaluate changes in larval distributions and associations with environmental conditions.

中文翻译：

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安大略湖肖蒙湾的思科 (Coregonus artedi) 和湖白鱼 (C. clupeaformis) 幼虫的空间分离

摘要 安大略湖中剩余的两种核心鱼种，cisco (Coregonus artedi) 和湖白鱼 (C. clupeaformis)，在纽约肖蒙湾产卵。幼虫在春季共同出现，但在形态上难以区分。我们使用来自肖蒙湾近岸和近海栖息地已知位置的 268 只幼虫的微卫星 DNA 位点应用遗传物种鉴定，以确定这些物种在每个栖息地的混合程度。Cisco 在近海栖息地中占主导地位的幼虫 (95%) 和湖白鱼在近岸栖息地中占主导地位 (84%)，其中 8 个假定的杂交种中有 7 个发生。这两个物种在幼虫阶段的栖息地隔离对生产力估计有影响，因为不断变化的环境条件可能会不同地影响浅水和深水、幼虫存活、以及可能的后续招聘。区分 cisco 和湖白鱼幼虫将有助于表征栖息地和基本生活史需求，并集中研究收藏。遗传物种鉴定应应用于较大的幼虫样本，以评估幼虫分布的变化以及与环境条件的关联。