Riparian integrity affects diet and intestinal length of a generalist fish species
Riparian integrity affects diet and intestinal length of a generalist fish species
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DOI：
10.1071/mf16167
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发表时间：
2017-01-01
影响因子：
1.8
通讯作者：
Melo, Adriano Sanches
中科院分区：
文献类型：
--
作者：
Dala-Corte, Renato Bolson;Becker, Fernando Gertum;Melo, Adriano Sanches
河岸带的人类活动会影响溪流鱼类的摄食，因为它们改变了本地生产（附生生物、大型植物和水生昆虫）和外来输入（陆地昆虫、树叶、种子和果实）。在本研究中，我们调查了如何饮食和肠道长度的持久性和多面手的鱼类（Bryconamericus iheringii，鱼科）在巴西南部的31个亚热带流的河岸修改。我们假设，肠道长度将更长的人口居住在河流转换河岸植被的结果，更大的消费量的难消化和低蛋白饮食。B的种群。来自河岸带退化和林冠覆盖减少的溪流的伊赫林格氏线虫的肠道长度较长（考虑到体型大小后），这与陆生植物和无脊椎动物的消耗减少以及丝状藻类、大型植物和碎屑的摄入增加有关。这些结果表明，河岸带的人为改变和增加冠层开放触发的饮食和肠道长度的B的转变。伊赫林吉。研究结果表明，肠道长度的可塑性是一个重要的特征，以确定鱼类种群是否可以在各种栖息地条件下持续存在，科普在人类改变的环境中消化更大比例的低质量和低蛋白食物。
Human activities in the riparian zone can affect the feeding of stream fish because they alter autochthonous production (periphyton, macrophytes and aquatic insects) and allochthonous inputs (terrestrial insects, leaves, seeds and fruits). In the present study we investigated how the diet and intestinal length of a persistent and generalist fish species (Bryconamericus iheringii, Characidae) responds to riparian modifications in 31 subtropical streams in southern Brazil. We hypothesised that intestinal length would be longer in populations inhabiting streams with converted riparian vegetation as a consequence of greater consumption of an indigestible and low-protein diet. Populations of B. iheringii from streams with a degraded riparian zone and reduced canopy cover had longer intestinal length (after accounting for body size), which was associated with decreased consumption of terrestrial plants and invertebrates and increased ingestion of filamentous algae, macrophytes and detritus. These results indicate that anthropic alteration of riparian zones and increased canopy openness trigger shifts in the diet and intestinal length of B. iheringii. The findings suggest that plasticity in intestinal length is an important characteristic to determine whether fish populations can persist in a variety of habitat conditions and cope with the digestion of a greater proportion of low-quality and low-protein food items in human-altered environments.