Lower biodiversity of native fish but only marginally altered plankton biomass in tropical lakes hosting introduced piscivorous Cichla cf. ocellaris

R.F. Menezes, J.L. Attayde, G. Lacerot, S. Kosten, L.S. Costa, L. Coimbra e Sousa, E.H. van Nes, E. Jeppesen

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

We compared the species richness and abundance of fish, zooplankton and phytoplankton in nine mesotrophic coastal shallow lakes (Northeastern Brazil) with and without the exotic predator cichlid tucunaré or ‘peacock bass’ (Cichla cf. ocellaris). We hypothesized that the introduction of tucunaré would lead to decreased abundance and species diversity of native fish assemblages and cause indirect effects on the abundance and species diversity of the existing communities of zooplankton and phytoplankton and on water transparency. Our hypotheses were only partly confirmed. Although fish richness and diversity were, in fact, drastically lower in the lakes hosting tucunaré, no significant differences were traced in total fish catch per unit of effort, zooplankton and phytoplankton biomass, plankton diversity or the zooplankton:phytoplankton biomass (TZOO:TPHYTO) ratio. However, zooplankton biomass and TZOO:TPHYTO tended to be higher and the phytoplankton biomass lower in lakes with tucunaré. Our analyses therefore suggest that the introduction of tucunaré had marked effect on the fish community structure and diversity in these shallow lakes, but only modest cascading effects on zooplankton and phytoplankton.
Original languageEnglish
Pages (from-to)1353-1363
JournalBiological Invasions
Volume14
Issue number7
DOIs
Publication statusPublished - 2012

Keywords

  • rarefaction diversity measurement
  • trophic cascade
  • food webs
  • impacts
  • biomanipulation
  • consequences
  • temperate
  • size
  • restoration
  • zooplankton

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