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 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.


Evaluation of factors associated with dynamics of Cichla ocellaris invasion of the Upper Paraná River floodplain system, Brazil

Luis Espínola, Carolina Minte-Vera, Horácio Júlio Jr., Luciano Santos, Kirk O. Winemiller

Abstract

The invasion of Cichla ocellaris was studied in the Upper Paraná River floodplain (UPRF). Generalized linear models (GLM) and the Akaike Information Criterion (AIC) were applied to standardized gillnet catch data (CPUE), with years, rivers, secchi depth, and their respective interactions. Generalized additive models (GAMs) and AIC were used to evaluate relationships of C. ocellaris CPUE with standard length, sampling year and secchi depth. Cichla ocellaris was first recorded in 1992 in the Paraná and Ivinheima rivers. Nevertheless, the CPUE of individuals was very low in the latter until 2000, and the species was not recorded from the Baía River until 2000. In 2001, CPUE of C. ocellaris greatly increased (from 20 to 140) in all three rivers, and this coincided with changes in hydrology and suspended sediment. Greater secchi depth is hypothesized to benefit foraging by these visually oriented, diurnal piscivores. The estimated annual growth rate for local populations was 21% for the Paraná, 42% for the Ivinheima, and 73% for the Baía. Consequently, relative to other populations, C. ocellaris of the Baía River and, to a lesser degree, the Ivinheima River appear to be less influenced by density-dependent factors given their more recent invasions of those areas.

MF13105  Accepted 23 April 2014
 
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