Environmental Biology of Fishes

, Volume 94, Issue 2, pp 403–419 | Cite as

Spatial and temporal variation of the ichthyoplankton in a subtropical river in Brazil

  • David Augusto Reynalte-Tataje
  • Angelo Antônio Agostinho
  • Andrea Bialetzki
  • Samara Hermes-Silva
  • Rodrigo Fernandes
  • Evoy Zaniboni-Filho
Article

Abstract

Studies that assess reproduction dynamics and ichthyoplankton distributions are scarce for the upper Uruguay River, especially in environments such as tributary mouths. Therefore, this study aimed to evaluate: (i) ichthyoplankton composition; (ii) spatial and temporal variation in ichthyoplankton abundance; and (iii) relationships between environmental variables and the abundance of ichthyoplankton during one annual cycle in this region. Monthly samples were collected from September 2001 to August 2002 in 48 h cycles at 6 h intervals between each sampling. Samples of eggs and larvae were collected from three of the main tributaries of the region (Ligeiro, Palomas and Chapecó rivers) and from three stretches of the Uruguay River near the confluence of these tributaries. Surface samples were collected with a 0.5 mm mesh cylindro-conical net. In general, reproductive seasonality was well-defined between October and February. It was most intense from November to January, when the photoperiod reached its highest values, flow was decreased, and the water temperature was increased. Based on egg and larval distributions, we found that spawning occurred mainly in the Ligeiro and Chapecó tributaries and in the Uruguay/Chapecó section. In contrast, fish spawning in the sites downstream of dams was more restricted. Finally, a difference was observed between the egg and larval distributions of the main river and its tributaries: the greatest reproductive activity in the tributaries occurred during periods of high flow and increased water temperature, while in the main river, more eggs and larvae were observed when the flow decreased and the water temperature increased.

Keywords

Eggs and larvae Spawning season Uruguay river Temperature Freshwater fish 

Supplementary material

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10641_2011_9955_MOESM2_ESM.doc (258 kb)
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • David Augusto Reynalte-Tataje
    • 1
  • Angelo Antônio Agostinho
    • 2
  • Andrea Bialetzki
    • 2
  • Samara Hermes-Silva
    • 1
  • Rodrigo Fernandes
    • 3
  • Evoy Zaniboni-Filho
    • 1
  1. 1.Laboratório de Biologia e Cultivo de Peixes de Água Doce (LAPAD)Universidade Federal de Santa CatarinaFlorianópolisBrazil
  2. 2.Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupelia)Universidade Estadual de MaringaMaringaBrazil
  3. 3.Laboratório de Ecologia QuantitativaUniversidade Federal Rural do Semi-AridoMossoroBrazil

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