Stage-structured feeding by freshwater fish assemblages in eastern South Dakota, USA
Stage-structured feeding by freshwater fish assemblages in eastern South Dakota, USA
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美国南达科他州东部淡水鱼群的阶段结构喂养
DOI：
10.1007/s10641-022-01296-8
复制
发表时间：
2022
影响因子：
1.4
通讯作者：
Wesner, Jeff S.
中科院分区：
文献类型：
--
作者：
Kanz, Abraham J.;Wesner, Jeff S.
水生昆虫在发育过程中经历了生态学的重大转变，例如从底栖消费者阶段（例如，幼虫）到浮游非消费阶段（例如，非喂食性脓疱）。鱼类在捕食过程中可能以不同的生命阶段为目标，但这种摄食的普遍性在很大程度上是未知的。为了确定阶段特定的喂养不同的鱼类，我们采样的鱼类饮食从四个淡水栖息地在东南部南达科他州，美国。我们测量了鱼的肠道内容物的分数，这些鱼由不以水生食物网为食的猎物组成（例如，陆生昆虫或水生昆虫的非消费阶段）。我们还比较了估计的饮食重叠使用的方法，包括或不包括猎物的生命阶段的信息。当平均在22种鱼类，17%（10%至25%）的饮食干重组成的猎物，不是消费者在水生食物网。非消费性猎物来自陆地补贴（11%）和水生猎物（6%）的非喂养生命阶段的混合。非消费性猎物的总体比例在鱼类之间变化很大，从镖鲈（黑鲈）的~ 2%到小鱼（条纹鲷）的~ 52%。添加猎物生命阶段的信息，估计饮食重叠揭示了存在的猎物生命阶段的专家和通才的鱼类种群，造成重叠下降。这种下降的幅度增加个别鱼吃更多的水生昆虫的非幼虫阶段。这些结果揭示了在估计鱼类饮食时考虑猎物的发育变化的重要性，并表明阶段结构的猎物分区减少饮食重叠。
Aquatic insects undergo substantial shifts in their ecology during development, such as changing from a benthic consumer stage (e.g., larva) to a pelagic non-consumer stage (e.g., non-feeding pupae). Fish may differentially target these life-stages during predation, but the prevalence of this feeding is largely unknown. To determine how stage-specific feeding varies among fish species, we sampled fish diets from four freshwater habitats in southeastern South Dakota, USA. We measured the fraction of gut contents in fish that consisted of prey that do not feed in the aquatic food web (e.g., terrestrial insects or non-consumer stages of aquatic insects). We also compared estimates of dietary overlap using methods that either included or did not include prey life-stage information. When averaged across 22 fish species, 17% (10 to 25%) of diet dry mass consisted of prey that were not consumers in the aquatic food web. Non-consumer prey came from a mix of terrestrial subsidies (11%) and non-feeding life-stages of aquatic prey (6%). The overall fraction of non-consumer prey varied widely among fish species, from ~ 2% in a darter (Etheostoma nigrum) to ~ 52% in a minnow (Notropis stramineus). Adding prey life-stage information to estimates of dietary overlap revealed the presence of prey life-stage specialists and generalists in the fish populations, causing overlap to decline. The magnitude of this decline increased as individual fish ate more non-larval stages of aquatic insects. These results reveal the importance of considering developmental changes in prey when estimating fish diets and indicate that stage-structured prey partitioning reduces dietary overlap.
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作为复杂系统的水陆联系：网络模型的见解和进展
影响因子：
1.8
作者：
S. Mažeika P. Sullivan;David W. P. Manning
通讯作者：
David W. P. Manning
水生捕食改变了陆地猎物补贴。
影响因子：
4.8
作者：
Jeff S. Wesner
通讯作者：
Jeff S. Wesner
影响因子：
1.8
作者：
B. Pusey;A. Arthington
通讯作者：
B. Pusey;A. Arthington
溪流鲤鱼对陆地节肢动物猎物的利用
影响因子：
1.4
作者：
G. Garman
通讯作者：
G. Garman
DOI：
10.1101/2020.12.10.419713
发表时间：
2020-12
期刊：
bioRxiv
影响因子：
--
作者：
Jeff S. Wesner;J. Pomeranz
通讯作者：
Jeff S. Wesner;J. Pomeranz