title: Diel vertical migration and spatial overlap between fish larvae and zooplankton in two tropical lakes, Brazil.
abstract: 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.
authors.affiliation: Programa de Pós-Graduação em Biologia Comparada, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: P H S
authors.initials: PH
authors.lastname: Picapedra
authors.affiliation: Programa de Pós-Graduação em Biologia Comparada, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: F A
authors.initials: FA
authors.lastname: Lansac-Tôha
authors.affiliation: Núcleo de Pesquisas em Limnologia Ictiologia e Aquicultura, Departamento de Biologia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Bialetzki
mesh_terms: D025041:Animal Migration; D000818:Animals; D001938:Brazil; D017753:Ecosystem; D005399:Fishes / Q000502:physiology*; D060106:Lakes; D007814:Larva / Q000502:physiology*; D011156:Population Density; D011157:Population Dynamics; D011235:Predatory Behavior; D012621:Seasons; D015048:Zooplankton / Q000145:classification