Picapedra P H S, Lansac-Tôha F A, Bialetzki A
Programa de Pós-Graduação em Biologia Comparada, Universidade Estadual de Maringá, Maringá, PR, Brazil.
Núcleo de Pesquisas em Limnologia Ictiologia e Aquicultura, Departamento de Biologia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
Braz J Biol. 2015 May;75(2):352-61. doi: 10.1590/1519-6984.13213.
The effect of fish larvae on the diel vertical migration of the zooplankton community was investigated in two tropical lakes, Finado Raimundo and Pintado lakes, Mato Grosso do Sul State, Brazil. Nocturnal and diurnal samplings were conducted in the limnetic region of each lake for 10 consecutive months from April 2008 to January 2009. The zooplankton community presented a wide range of responses to the predation pressure exerted by fish larvae in both environments, while fish larvae showed a typical pattern of normal diel vertical migration. Our results also demonstrated that the diel vertical migration is an important behaviour to avoid predation, since it reduces the spatial overlap between prey and potential predator, thus supporting the hypothesis that vertical migration is a defence mechanism against predation.
在巴西南马托格罗索州的菲纳多·雷蒙多湖和品塔多湖这两个热带湖泊中，研究了鱼幼体对浮游动物群落昼夜垂直迁移的影响。从2008年4月至2009年1月，在每个湖泊的敞水区连续10个月进行夜间和白天采样。在这两种环境中，浮游动物群落对鱼幼体施加的捕食压力呈现出广泛的反应，而鱼幼体表现出典型的正常昼夜垂直迁移模式。我们的结果还表明，昼夜垂直迁移是一种重要的避免被捕食的行为，因为它减少了猎物与潜在捕食者之间的空间重叠，从而支持了垂直迁移是一种抵御捕食的防御机制这一假设。
