...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Archiv fur Hydrobiologie >Determinants of substrate selection in lotic mayfly larvae: is cryptic coloration important?
【24h】

Determinants of substrate selection in lotic mayfly larvae: is cryptic coloration important?

机译：lot虱幼虫底物选择的决定因素：隐秘着色重要吗？

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Crypsis, or resemblance with the background, is known to be important for many aquatic organisms, but its role in lotic predator-prey systems is poorly known. In a combination of laboratory experiments and field observations, we studied whether two species of lotic mayfly larvae (Baetis rhodani, heptagenia dalecarlica) show cryptic behavior (i.e., prefer dark substrates), and how this is affected by predation risk and food availability. Both species were able to distinguish between differently colored substrate patches, as well as between patches of variable food reward. A majority of larvae (56-78 %) chose dark substrates over light-colored ones, both in the laboratory and in natural streams. This behavior, however, was differently modified in the two species by variation in predation risk and food reward. For Baetis larvae, predation risk and food reward had no effect on the preference for dark substrate patches. Similarly, the proportion of larvae on dark substrates did not differ between streams with and without fish. In fishless controls, Heptagenia used dark patches with low food reward less than predicted, whereas in the presence of fish, light-colored patches were under-selected, especially those with high food reward. We suggest that differences in patterns of substrate choice between Baetis and Heptagenia are related to their different life-styles, although other antipredator behaviors are probably more important in most field situations. [References: 32]
机译：众所周知，隐孢子虫或与背景相似，对许多水生生物都很重要，但其在捕食者-捕食者-猎物系统中的作用却鲜为人知。在实验室实验和现场观察的结合中，我们研究了两种抽水lot蝇幼虫（Baetis rhodani，heptagenia dalecarlica）是否表现出隐秘行为（即偏爱深色底物），以及这如何受到捕食风险和食物供应的影响。两种物种都能够区分不同颜色的底物斑块以及可变食物奖励的斑块。在实验室和自然流中，大多数幼虫（56-78％）选择深色底物而不是浅色底物。但是，通过捕食风险和食物奖励的变化，这两种动物的行为得到了不同的改变。对于Baetis幼虫，捕食风险和食物奖励对深色底物补丁的偏好没有影响。同样，在有或没有鱼的溪流中，深色底物上幼虫的比例也没有差异。在无鱼对照组中，Heptagenia使用食物奖励较低的深色斑块低于预期，而在有鱼的情况下，浅色斑块的选择不足，尤其是食物奖励较高的斑块。我们建议，Baetis和Heptagenia之间底物选择模式的差异与它们的生活方式有关，尽管在大多数现场情况下其他反捕食者行为可能更为重要。 [参考：32]

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号