Diet-dependent body morphology and ontogenetic reaction norms in Eurasian perch
Diet-dependent body morphology and ontogenetic reaction norms in Eurasian perch
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DOI：
10.1034/j.1600-0706.2001.950213.x
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发表时间：
2001-11-01
期刊：
影响因子：
3.4
通讯作者：
Wahlström, E
中科院分区：
文献类型：
--
作者：
Hjelm, J;Svanbäck, R;Wahlström, E
资源水平的变化直接或间接地影响着个体的形态和生产性能，为了研究不同资源条件对河鲈（Perca fluviatilis）形态和个体发育反应指标的影响，采用3种不同的方法研究了不同资源条件对河鲈形态和个体发育反应指标的影响。首先，我们研究了形态轨迹在早期个体发育有关的湖泊特有的资源在实地研究。第二，一个湖，缺乏鲈鱼招聘与鲈鱼蛋从控制湖在整个湖泊的实验研究个体发育反应规范。第三，我们比较了YOY鲈鱼的发展，主要居住在三个湖泊的沿岸的区与YOY鲈鱼实验局限于围隔中的中上层。区域的湖泊。整体身体形态的YOY鲈鱼改变作为一个功能的大小和作为一个功能的饮食。随着鲈鱼的大小增加，他们开发了一个更深的身体形态相应的比例增加底栖大型无脊椎动物在他们的饮食。在远洋外壳鲈鱼被限制主要以浮游动物为食，他们有一个更梭形的身体形态比鲈鱼在湖泊中，以浮游动物和大型无脊椎动物的混合物为食。同样，个体发育反应规范的鲈鱼有关的饮食和湖泊特定的浮游动物水平在整个湖泊experiment.In远洋外壳，鲈鱼具有高增长率有一个更梭形的身体形态比缓慢增长的鲈鱼，而相反的是在湖泊中，鲈鱼包括更多的大型无脊椎动物在他们的饮食。栖息在湖泊中的饮食中的大型无脊椎动物的比例较高，也有更深的身体形态。相反的形态-增长率之间的关系，发现在浮游层与那些使用整个湖泊的鲈鱼表明浮游动物和大型无脊椎动物的觅食之间的形态权衡。我们的研究结果表明，YOY鲈鱼表现出不同的个体发育反应规范作为湖泊特定的资源水平的函数，这可能允许YOY招聘到后期阶段。我们的研究结果进一步表明，饮食相关的形态变化是一个快速的过程。
Individual morphology and performance are directly or indirectly under the influence of variation in resource levels, To study the effects of different resource conditions and their effects on morphology and ontogenetic reaction norms in young-of-the-year (YOY) perch (Perca fluviatilis), we used three different approaches. First, we examined the morphological trajectories over early ontogeny in relation to lake-specific resources in a field study. Second, one lake that lacked perch recruitment was stocked with perch eggs from a control lake in a whole-lake experiment to study ontogenetic reaction norms. Third, we compared the development of YOY perch in the three lakes that mainly inhabited the littoral zone with YOY perch experimentally confined to enclosures in the pelagic. zone of the lakes.Overall body morphology of the YOY perch changed both as a function of size and as a function of diet. As perch increased in size they developed a deeper body morphology corresponding to an increased proportion of benthic macroinvertebrates in their diet. In pelagic enclosures where perch were constrained to feed mainly on zooplankton they had a more fusiform body morphology than perch in the lakes that fed on a mixture of zooplankton and macroinvertebrates. Similarly, the ontogenetic reaction norm of perch was related to the diet and lake-specific zooplankton levels in the whole-lake experiment.In the pelagic enclosures, perch with high growth rates had a more fusiform body morphology than slow-growing perch, whereas the opposite was found in the lakes, where perch included more macroinvertebrates in their diets. Perch in lakes with a higher proportion of macroinvertebrates in the diet also had deeper body morphology. The opposite morphology - growth rate relationship found between perch in the pelagic versus those using the whole lake suggest a morphological trade-off between foraging on zooplankton and foraging on macroinvertebrates. Our results suggest that YOY perch show different ontogenetic reaction norms as a function of lake-specific resource levels, which may allow YOY recruitment to later stages. Our results further suggest that diet-related changes in morphology are a rapid process.