期刊
HYDROBIOLOGIA
卷 848, 期 9, 页码 2189-2201出版社
SPRINGER
DOI: 10.1007/s10750-020-04454-0
关键词
Biological invasions; Reproductive effort; Time series; Paraná river; Schizodon borellii
资金
- project Pesquisas Ecologicas de Longa Durac ao (PELD)
- project Financiadora de Estudos e Projetos (FINEP)
- Programa de Apoio ao Desenvolvimento Cientifico e Tecnologico e Ciencias Ambientais (PADCT/CIAMB)
- GRECO group of the University of Girona
- Conselho Nacional de Desenvolvimento Cienti'fico e Tecnologico (CNPq)
- Spanish Ministry of Science [PID2019-103936 GB-C21, RED2018-102571-T]
- Government of Catalonia [2017 SGR 548]
This study analyzed trends in abundance of two characiform fishes in the upper Parana River and its floodplain over a long time series, finding a marked decline in the native species S. altoparanae which was significantly correlated with the abundance of the invasive species S. borellii. Competitive interactions may have contributed to the decline of the native species.
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 feeding-related morphology, reproductive investment, and spatial and temporal variations in abundance, 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 interactions may have contributed to the decline of the native S. altoparanae.
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