Basal carbon sources and planktonic food web in a tropical lake: an isotopic approach
Paula C. J. Reis A C , Luiz A. Martinelli B and Francisco A. R. Barbosa A
+ Author Affiliations
- Author Affiliations
A Laboratório de Limnologia, Ecotoxicologia e Ecologia Aquática, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Brazil.
B Laboratório de Ecologia Isotópica, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-000, Piracicaba, Brazil.
C Corresponding author. Email: paulacjr@gmail.com.
Marine and Freshwater Research 68(3) 429-441 https://doi.org/10.1071/MF14322
Submitted: 13 October 2015 Accepted: 9 February 2016 Published: 4 May 2016
Abstract
Trophic connections among habitats may be central to food-web dynamics in lakes. Lacustrine zooplankton can rely on basal carbon (C) sources from different origins and plays an important link between these and organisms in higher trophic levels. We investigated the basal C sources supporting the planktonic food web and the trophic relationships among zooplankton size fractions in a tropical lake (Carioca) in Brazil. To do so, we measured the C and nitrogen (N) stable-isotope ratios in basal C sources originated in terrestrial, littoral, and pelagic habitats and in zooplankton size fractions, and data were analysed through Bayesian mixing models. Mesozooplankton showed seasonal variation in resource use, specifically a smaller dependence on algae in the wet than in the dry season. In the wet season, mesozooplankton relied more on the detritivore food chain eating mostly microzooplankton (mode: 95.1%), which in turn consumed mostly terrestrial C in this season (mode: 74.7%). Zooplankton size fractions also occupied different relative trophic positions between seasons. These variations seem to follow the seasonal dynamics of in-lake primary production and of terrestrial C inputs. Also, all size fractions of zooplankton, and particularly Chaoboridae larvae, showed low C staple-isotope values, suggesting the consumption of a missing C source.
Additional keywords: autochthony and allochthony, energy and material flows, resources use, SIAR.
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