Growth in length and in body depth in young‐of‐the‐year perch with different predation risk
Growth in length and in body depth in young‐of‐the‐year perch with different predation risk
复制标题
不同捕食风险下幼鲈的身长和体深生长
DOI：
10.1111/j.1095-8649.2004.00325.x
复制
发表时间：
2004
影响因子：
2
通讯作者：
E. Heibo
中科院分区：
文献类型：
--
作者：
C. Magnhagen;E. Heibo
体型的一年（YOY）鲈鱼fluviatilis，和数量和规模的潜在捕食者（鲈鱼和梭子鱼lucius）进行了比较，在北方瑞典的五个湖泊。不同湖泊间的鱼体深度和背鳍条长度存在差异，大型鱼类数量最多的湖泊鱼体相对深度和背鳍条长度较高。湖中发现了最细长的鱼，那里的鲈鱼种群数量最少，梭鱼的数量也非常少。在YOY鲈鱼的平均体重从两个湖泊的最高和最低的身体深度，分别是相同的，这表明在长度和深度之间的关系增长的湖泊之间的差异。体长和鳍条长度与梭子鱼的捕食风险相关。鳍线长度也与食鱼鲈鱼的数量相关。不同的生物和非生物因素，单独或组合，可以导致不同的身体形状的选择，从本研究的结果表明，捕食风险是影响鲈鱼的身体深度和鳍条长度的这些因素之一。
Body shape of young-of-the-year (YOY) perch Perca fluviatilis, and number and size of potential predators (perch and pike Esox lucius) were compared across five lakes in northern Sweden. Body depth and dorsal fin ray length of YOY perch differed between lakes, with high relative body depth and long dorsal fin rays found in the lakes where the number of large piscivores was the highest. The most slender fish were found in the lake where the perch population had the smallest individuals and pike occurred in very low numbers. The average body mass in YOY perch from the two lakes with highest and lowest body depth, respectively, were the same, which indicates a difference between lakes in the relation between growth in length and in depth. Both body depth and fin ray length were correlated with predation risk by pike. Fin ray length was also correlated with number of piscivorous perch. Selection for different body shapes can be caused by different biotic and abiotic factors, singly or in combination, and the results from this study indicates that predation risk is one of these factors affecting body depth and fin ray length in perch.