The invasion of an alien characiform fish and the decline of a native congener in a Neotropical river-floodplain system
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INVASIVE SPECIES III
The invasion of an alien characiform fish and the decline of a native congener in a Neotropical river-floodplain system Maria Julia Mileo Ganassin . Emili Garcı´a-Berthou . Amanda Cantarute Rodrigues Carolina Pedrozo do Nascimento . Carolina Mendes Muniz . Matheus Teno´rio Baumgartner . Marcelo Henrique Schmitz . Luiz Carlos Gomes
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Received: 11 March 2020 / Revised: 29 September 2020 / Accepted: 22 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract Using a long time series, we analyzed trends in abundance of two characiform fishes in the upper Parana´ River and its floodplain: the native Schizodon altoparanae and its alien congener Schizodon borellii, which invaded the floodplain in the last decades. We aimed to contribute to the understanding of the invasive species success and its relationship with its native congener. We compared feedingrelated morphology, reproductive investment, and spatial and temporal variations in abundance, Guest editors: Katya E. Kovalenko, Fernando M. Pelicice, Lee B. Kats, Jonne Kotta & Sidinei M. Thomaz / Aquatic Invasive Species III
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04454-0) contains supplementary material, which is available to authorized users. M. J. M. Ganassin (&) A. C. Rodrigues C. P. do Nascimento C. M. Muniz M. T. Baumgartner M. H. Schmitz L. C. Gomes Nu´cleo de Pesquisa em Limnologia, Ictiologia e Aquicultura, Programa de Po´s-Graduac¸a˜o em Ecologia de Ambientes Aqua´ticos Continentais, Laborato´rio de Ictiologia, Universidade Estadual de Maringa´, Av. Colombo, 5.790, Bloco G-90, CEP 87020-900 Maringa´, PR, Brazil e-mail: [email protected]
searching for possible negative interactions between them. S. altoparanae presented a marked abundance decline between 1986 and 2018, varying with river systems and habitats, but also depending significantly on the abundance of the alien. The native was more abundant in rivers and channels, whereas S. borellii thrived in all habitats, but particularly in channels. Moreover, the alien species, when compared to S. altoparanae, presented relatively larger head depths and mouth gape, and higher values of relative gonadal weight for smaller females. Overall, our results suggest a more generalist habitat use, greater investment in reproduction at small sizes, and larger mouth gape for the invader, which might provide competitive advantages. Although multiple disturbances impact the floodplain, our results suggest that competitive
L. C. Gomes Nu´cleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringa´ (UEM), Parana´, Brazil
M. J. M. Ganassin E. Garcı´a-Berthou C. M. Muniz GRECO, Institute of Aquatic Ecology, University of Girona, 17003 Girona, Catalonia, Spain
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Hydrobiologia
interactions may have contributed to the decline of the native S. altoparanae. Keywords Biological invasions Reproductive effort Time series Parana´ riv
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