Alternative use of food resources causes intra-cohort variation in the size distribution of young-of-the-year perch (Perca fluviatilis)
Alternative use of food resources causes intra-cohort variation in the size distribution of young-of-the-year perch (Perca fluviatilis)
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DOI：
10.1111/j.1600-0633.2008.00300.x
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发表时间：
2008-09-01
影响因子：
1.8
通讯作者：
Borcherding, J.
中科院分区：
文献类型：
--
作者：
Urbatzka, R.;Beeck, P.;Borcherding, J.
在第一个夏天结束时，一年四季（YOY）鲈鱼（Perca fluviatilis）的身体大小变化很大，在不同的研究中，范围在4到15厘米之间。要分析是否在YOY鲈鱼的大小分歧可能是由于替代使用的食物资源，成年鲈鱼放养到两个以前无鱼池塘和增长，大小分布和食物摄入量的YOY鲈鱼记录。除鲈鱼外，还引入成年团头鲂（Abramis brama），以生产可作为YOY鲈鱼食物资源的团头鲂幼鱼。试验结束时，鱼体大小为32 ~ 168 mm，呈双峰分布。胃内容物分析和稳定同位素特征的组合显示，小规模的队列是食草/底栖动物，而大规模的队列是食鱼/同类相食。结果表明，不同的摄食行为有助于在YOY鲈鱼的大小分歧，并在大尺寸的群体的极端增长是由食鱼诱导。
Body sizes of young-of-the-year (YOY) perch (Perca fluviatilis) at the end of their first summer are extremely variable and range in different studies between 4 and 15 cm. To analyse whether size divergences in YOY perch may be attributed to alternative use of food resources, adult perch were stocked into two previously fishless ponds and growth, size distribution and food intake of the YOY perch were recorded. In addition to perch, adult bream (Abramis brama) were introduced to produce juvenile bream that could serve as a food resource for YOY perch. The body sizes of YOY perch at the end of the experiment ranged from 32 to 168 mm with a bimodal size distribution. The combination of stomach content analyses and stable isotope signatures revealed that the small size cohort were planctivorous/benthivorous while the large size cohort was piscivorous/cannibalistic. Results implicated that different feeding behaviour contributed to the size divergences in YOY perch and that the extreme growth of the large size cohort was induced by piscivory.