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Effects of the Nile tilapia (Oreochromis niloticus L.) on the plankton community of a tropical reservoir during and after an algal bloom
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Departamento de Ecologia, Universidade Federal do Rio Grande do Norte, Natal, Brazil.ORCID iD: 0000-0002-2327-9716
2018 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 817, no 1, p. 393-401Article in journal (Refereed) Published
Abstract [en]

The invasive species Nile tilapia is a filter-feeding omnivorous fish that can have a negative effect on zooplankton and phytoplankton resources. However, the strength of its effects on plankton communities should decrease with increasing plankton biomass, e.g., during an algal bloom. We tested this hypothesis by performing two experiments in a tropical reservoir, where we randomly allocated two treatments (with and without tilapia) to 20 mesocosms. The first experiment was conducted during an algal bloom (biovolume = 1038.34 mm(3) l(-1)), while the second experiment was conducted after the bloom (biovolume = 1.05 mm(3) l(-1)). The negative effects of fish on mesozooplankton (mean size of 480 mu m in both experiments) and large algae (GALD < 50 mu m) were stronger in the second than in the first experiment. On the other hand, the negative effects of fish on microzooplankton (experiment 1: mean size 180 mu m; experiment 2: mean size 128 mu m) and small algae (GALD < 50 mu m) were stronger in the first than in the second experiment. We conclude that the Nile tilapia can suppress phytoplankton and zooplankton biomass in tropical lakes and reservoirs, but the magnitude of this effect depends on plankton biomass and size-structure.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 817, no 1, p. 393-401
Keywords [en]
Invasive species, Nile tilapia, Omnivory, Trophic cascade, Eutrophication, Community size-structure
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-148707DOI: 10.1007/s10750-018-3591-2ISI: 000432325000031Scopus ID: 2-s2.0-85044346118OAI: oai:DiVA.org:umu-148707DiVA, id: diva2:1223460
Available from: 2018-06-25 Created: 2018-06-25 Last updated: 2018-06-25Bibliographically approved

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Vasconcelos, Rivera Francisco
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