Diel feeding rhythm of copepod size-fractions from Coliumo Bay, Central Chile

Authors

  • Danilo Calliari Sección Oceanografía, Universidad de la República
  • Tarsicio Antezana Departmento de Oceanografía, Universidad de Concepción

DOI:

https://doi.org/10.3989/scimar.2001.65n4269

Keywords:

zooplankton, copepods, size-fractions, feeding rhythms, Chile

Abstract


The feeding behaviour of the size fractionated copepod assemblage was studied over a diel cycle in Coliumo Bay. In this shallow environment the photic layer reached the bottom and salinity, temperature, and food availability were fairly homogeneous throughout the water column. All four size-fractions (250-500 ?m, 500-1000 ?m, 1000-2000 ?m, >2000 ?m) showed a period of high feeding activity during the night and low feeding activity during the day. The persistence of nocturnal feeding in the presence of high food concentration over the 24-h cycle is interpreted as a predator avoidance strategy: empty guts by day make copepods less conspicuous to their visual daytime predators.

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Published

2001-12-30

How to Cite

1.
Calliari D, Antezana T. Diel feeding rhythm of copepod size-fractions from Coliumo Bay, Central Chile. scimar [Internet]. 2001Dec.30 [cited 2022Sep.29];65(4):269-74. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/659

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Section

Articles