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Dominance and diet are unrelated within a population of invasive crayfish
Hydrobiologia ( IF 2.2 ) Pub Date : 2019-10-17 , DOI: 10.1007/s10750-019-04088-x
Amaryllis K. Adey , Eric R. Larson

Laboratory behavioral experiments are an important tool in ecology and evolution, but whether these behaviors reflect the field function of organisms is not always clear. Directly connecting laboratory behaviors to field interactions would increase understanding of a variety of organisms. A recent study proposed using stable isotopes to link laboratory behaviors to field function of individuals, but failed to find any such links within a population of the invasive rusty crayfish Faxonius rusticus (Girard, 1852). Here, we assessed whether methodological decisions around tissue analyzed for stable isotopes, laboratory acclimation time, and timing of primary consumer collection may have affected the result, hypothesizing that more dominant crayfish would have higher trophic positions and tissue with faster turnover rates may exhibit a stronger association between laboratory behavior and recent field function. We tested this relationship using F. rusticus individuals from a single population, and related laboratory dominance to stable isotope-derived trophic position using linear regression. We failed to find a relationship between dominance and trophic position, regardless of our different methodologies. Future studies should consider alternative behaviors that may better relate to function in the field and also investigate whether laboratory behavior and field function are related between, rather than within, populations or species.

中文翻译:

在入侵的小龙虾种群中,优势和饮食无关

实验室行为实验是生态学和进化的重要工具,但这些行为是否反映了生物体的场功能并不总是很清楚。将实验室行为与现场互动直接联系起来会增加对各种生物的理解。最近的一项研究提议使用稳定同位素将实验室行为与个体的现场功能联系起来,但未能在入侵的锈斑小龙虾 Faxonius rusticus 种群中找到任何此类联系(Girard,1852 年)。在这里,我们评估了围绕稳定同位素分析的组织的方法学决定、实验室适应时间和初级消费者收集时间是否可能影响结果,假设更占优势的小龙虾将具有更高的营养位置和更快的更新率组织,可能会在实验室行为和最近的野外功能之间表现出更强的关联。我们使用来自单一种群的 F. rusticus 个体测试了这种关系,并使用线性回归测试了稳定同位素衍生营养位置的相关实验室优势。无论我们采用何种不同的方法,我们都未能找到优势和营养位置之间的关系。未来的研究应该考虑可能与野外功能更好地相关的替代行为,并调查实验室行为和野外功能是否在种群或物种之间而不是在种群或物种内部相关。来自单个种群的 rusticus 个体,以及使用线性回归对稳定同位素衍生的营养位置的相关实验室优势。无论我们采用何种不同的方法,我们都未能找到优势和营养位置之间的关系。未来的研究应该考虑可能与野外功能更好地相关的替代行为,并调查实验室行为和野外功能是否在种群或物种之间而不是在种群或物种内部相关。来自单一种群的 rusticus 个体,以及使用线性回归对稳定同位素衍生的营养位置的相关实验室优势。无论我们采用何种不同的方法,我们都未能找到优势和营养位置之间的关系。未来的研究应该考虑可能与野外功能更好地相关的替代行为,并调查实验室行为和野外功能是否在种群或物种之间而不是在种群或物种内部相关。
更新日期:2019-10-17
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