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Food web changes associated with drought and invasive species in a tropical semiarid reservoir

  • INVASIVE SPECIES II
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Abstract

Fish and invertebrates are introduced in freshwaters around the world for commercial purposes, despite widely known impacts on food webs and biological invasions. As a proxy for artificial environments, we modeled a typical reservoir in a Brazilian semiarid region using an ecosystem approach. We compared the role of native and non-native invasive species (NIS) in the food web, between dry and wet periods, and under the influence of an extreme drought period (from 2011 to 2015), simulating the variation in fish biomasses due to decreasing consumption. Key ecosystem groups were fishes (mainly NIS), birds, and insects. Nutrient cycling was dependent on invaders, while the trophic structure was detritus based during the drought. Biomass of detritivores was almost two times higher than herbivores, and native fish species decreased abruptly in response to invaders and volume variation. The dominance of low-trophic levels (TLII) and tilapia—Oreochromis niloticus (Linnaeus, 1758) and other tilapiines—resulted from interactions among invaders, feeding behavior on benthos, and environmental seasonality, tending toward biotic homogenization (“benthification”) at the ecosystem level. An increasing relevance of detritivores with cascading effects in ecosystems subject to drought, multiple introductions, and ubiquitous food sources has clear implications for the fisheries and the water quality.

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Acknowledgements

We are thankful to the Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP, AE1-0052-00044.01.00/11 SPU nº: 11295057-4) for the funding to this project. Coordenadoria de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for granting the first author with scholarships and funding M. Coll (PVE A063-2013), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the funding to JRS Vitule (310850/2012-6 and 303776/2015-3). Thanks also to Sr. Walt Disney Paulino, to Sr. Deílton Holanda and to other technicians from the Companhia de Gestão do Recursos Hídricos (COGERH, Ceará, Brazil), as well as the staff of the Laboratório de Ecologia Aquática (LEA), from the Universidade Federal do Ceará, for sampling support and post processing, and the ornithologists Caio Brito, Lucas Barros e Bruno Martins for the identification of birds.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Ecologia e Conservação, Laboratório de Análise e Síntese em Biodiversidade (LASB), Universidade Federal do Paraná, Curitiba, PR, 81531-980, Brazil

    Luis Artur Valões Bezerra

  2. Departamento de Engenharia Civil, Universidade Federal do Rio Grande do Norte, BR 101, Campus Universitário, Natal, RN, 59078-970, Brazil

    Ronaldo Angelini

  3. Laboratório de Ecologia e Conservação (LEC), Universidade Federal do Paraná, Curitiba, PR, 81531-970, Brazil

    Jean Ricardo Simões Vitule

  4. Institut de Ciències del Mar (ICM-CSIC), Ecopath International Initiative Research Association, Barcelona, Spain

    Marta Coll

  5. Laboratório de Ecologia Aquática (LEA)¸ Departamento de Biologia, Universidade Federal do Ceará, Campus do Pici, Bloco 906, Fortaleza, CE, 60440-900, Brazil

    Jorge Iván Sánchez-Botero

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  1. Luis Artur Valões Bezerra
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  2. Ronaldo Angelini
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  3. Jean Ricardo Simões Vitule
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Correspondence to Luis Artur Valões Bezerra.

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Guest editors: John E. Havel, Sidinei M. Thomaz, Lee B. Kats, Katya E. Kovalenko, & Luciano N. Santos / Aquatic Invasive Species II

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Bezerra, L.A.V., Angelini, R., Vitule, J.R.S. et al. Food web changes associated with drought and invasive species in a tropical semiarid reservoir. Hydrobiologia 817, 475–489 (2018). https://doi.org/10.1007/s10750-017-3432-8

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