Isotopic niche size of Coregonus artedi (sensu lato) Increases in the presence of Mysis diluviana, expanded habitat use and phenotypic diversity,Ecology and Evolution

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Isotopic niche size of Coregonus artedi (sensu lato) Increases in the presence of Mysis diluviana, expanded habitat use and phenotypic diversity
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-09-21 , DOI: 10.1002/ece3.6807
Mark S Ridgway ₁ , Gabriel Piette-Lauzière ₂ , Allan H Bell ₁ , Julie Turgeon ₂

Affiliation

Post‐glacial colonization of lakes in Algonquin Park, Ontario, Canada resulted in food webs with cisco (Coregonus artedi sensu lato) and either Mysis diluviana or Chaoborus spp. as the dominant diel migrator. Mysis as prey, its diel movements and benthic occupancy, are hypothesized to be key elements of ecological opportunity for cisco diversity in the Laurentian Great Lakes. If correct, the hypothesis strongly implies that lakes with Mysis would have greater trophic niche size and drive greater adaptive radiation of cisco forms relative to lakes without Mysis. The dichotomy in diel migrator in Algonquin Park lakes was an opportunity to assess the isotopic niche size of cisco (δ¹⁵N and δ¹³C) and determine if niche size expands with Mysis presence. We found the presence of Mysis is necessary to expand isotopic niche size in our study lakes. The use of habitats not typically associated with the ancestral form of cisco (e.g., benthic habitats) and phenotypic diversity (blackfin and cisco) also continue to expand niche size in Mysis‐based food webs. Partial ecological speciation based on a large niche space appears to be present in one lake (Cauchon Lake) where use of alternative habitats is the only real difference in cisco. The presence of blackfin expands niche space in Cedar and Radiant Lakes. This was not matched in Hogan Lake where niche space was relatively smaller with similar forms. Possible reasons for this discrepancy may be related to the asymmetric basin of Hogan Lake and whether the two forms overlap during cool and cold‐water periods of the annual temperature cycle. By comparing trophic niche size among lakes with and without Mysis, we conclude that Mysis provides a key ecological opportunity for cisco diversity in our study lakes and likely more widely.

中文翻译：

Coregonus artedi（意义）的同位素生态位大小随着 Mysis diluviana 的存在而增加，扩大了栖息地利用和表型多样性

加拿大安大略省阿尔冈昆公园湖泊的冰期后殖民化导致了含有 cisco ( Coregonus artedi sensu lato) 和Mysis diluviana或Chaoborus spp 的食物网。作为主要的昼夜迁移者。糠虾作为猎物，其昼夜运动和底栖栖息地被认为是劳伦森五大湖思科多样性生态机会的关键要素。如果正确，该假设强烈暗示，与没有糠虾的湖泊相比，有糠虾的湖泊将具有更大的营养生态位大小，并驱动思科形式更大的适应性辐射。阿冈昆公园湖泊中昼夜洄游者的二分法是评估 cisco 的同位素生态位大小（δ ¹⁵ N 和 δ ¹³ C）并确定生态位大小是否随着糠虾存在而扩大的机会。我们发现糠虾的存在对于扩大我们研究湖中的同位素生态位大小是必要的。使用通常与西斯科祖先形式不相关的栖息地（例如，底栖栖息地）和表型多样性（黑鳍金枪鱼和西斯科）也继续扩大糠虾属食物网中的生态位规模。基于大生态位空间的部分生态物种形成似乎存在于一个湖泊（Cauchon 湖）中，其中替代栖息地的使用是 cisco 中唯一真正的区别。黑鳍金枪鱼的存在扩大了雪松湖和辐射湖的利基空间。这与霍根湖不符，那里的生态位空间相对较小，但形式相似。造成这种差异的可能原因可能与霍根湖盆地的不对称以及这两种形式在年温度循环的凉爽期和冷水期是否重叠有关。通过比较有和没有糠虾的湖泊之间的营养生态位大小，我们得出结论，糠虾为我们研究的湖泊以及可能更广泛的湖泊多样性提供了关键的生态机会。

更新日期：2020-10-29

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