溪流鱼类的大脑形态和觅食行为

IF 1.4 4区 环境科学与生态学 Q3 ECOLOGY
Pria N. Mahabir, Caraline Billotte, Marie K. Gutgesell, Matthew M. Guzzo, Kevin S. McCann, Nicholas J. Bernier, Frédéric Laberge
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引用次数: 0

摘要

脑的形态(即脑的大小和形态)与湖泊和海洋中鱼类物种之间觅食行为的变化有关,例如较大的脑与鱼类在食物链中觅食的位置较高有关。然而,人们对不同栖息地或溪流鱼类的这些关系知之甚少。因此,我们探讨了加拿大安大略省西南部不同溪流中杂食性溪鲢(Semotilus atromaculatus)的觅食行为与大脑形态之间的关系。我们评估了觅食行为变量(即营养位置、食物中陆地能量的比例以及对水生和陆地资源的觅食灵活性)与脑形态(即相对脑大小以及小脑、下丘脑、嗅球、视神经和端脑的比例大小)之间的关系。主成分分析用于提取脑区大小之间的共变模式。我们发现,溪鲢的脑部大小与营养位置和食物中陆地能量的比例呈正相关,但与觅食的灵活性无关。第一主成分解释了91%的脑区大小协变,它与营养位置也呈正相关,但与食物中陆地能量的比例无关,这表明所测量的脑区以外的脑区也对脑区大小与食物中陆地能量的比例之间的关系做出了贡献。我们的研究结果表明,脑大小与营养位置之间的关系在鱼类中可能很常见,在溪流中觅食陆地能量途径的资源可能会给鱼类带来一种新的认知挑战,但这种挑战的特征尚不清楚。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Brain form and foraging behaviour in a stream fish

Brain form and foraging behaviour in a stream fish

Brain form (i.e., brain size and morphology) has been linked to variation in foraging behaviour among species of fishes in lakes and oceans, such as larger brains associated with fish foraging higher in the food chain. However, much less is known about these relationships across habitats, or in stream fishes. Therefore, we explore relationships between foraging behaviour and brain form in the omnivorous creek chub (Semotilus atromaculatus) across different streams of Southwest Ontario, Canada. We assessed foraging behaviour variables (i.e., trophic position, proportion of terrestrial energy in diet and foraging flexibility on aquatic and terrestrial resources) against brain form (i.e., relative brain size and the proportional size of the cerebellum, hypothalamus, olfactory bulbs, optic tectum, and telencephalon). Principal component analysis was used to extract covariation patterns among the size of brain regions. We found that creek chub brain size is positively associated with trophic position and proportion of terrestrial energy in diet, but not foraging flexibility. The first principal component, explaining 91% of size covariation among brain regions, was also positively associated with trophic position but not with proportion of terrestrial energy in diet suggesting that brain regions outside of those measured contribute to the association between brain size and proportion of terrestrial energy in diet. Our results suggest that a relationship between brain size and trophic position may be common among fishes, and that foraging on resources from the terrestrial energetic pathway in streams may present a novel, yet to be characterized cognitive challenge for fish.

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来源期刊
Environmental Biology of Fishes
Environmental Biology of Fishes 环境科学-海洋与淡水生物学
CiteScore
2.60
自引率
14.30%
发文量
169
审稿时长
3 months
期刊介绍: Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding. Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.
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