Abstract
The objective was to explore levels of persistence and stability of a Neotropical fish assemblage in a typical Serra do Mar stream (Southeast Brazil) over 1994–2008 with 90 quantitative samples in total. All along the stream gradient, the fish assemblage was composed of small-sized, short living species including benthic and water column species. Only four species occurred at the uppermost site (i.e., S1) whereas these four species plus eight species occurred at all other sites. In regards to species presence-absence, all species were temporally persistent at all sites over the study years. Overall, all species were abundant across scales of space and time with only three out of 14 species showing consistently low densities along the stream across years. Nevertheless, as indicated by the temporal variations in the Coefficients of Variation (CV%), the fish assemblages were highly unstable at all sites over time. At all sites the CV% varied widely and increased significantly over the years. No consistent density-dependence was elucidated nor any significant correlation among environmental variables and assemblage attributes were detected. The only consistent relationship elucidated relates the CV% of assemblage variability over time and the CV% of the ratio between stream discharge in the two major seasons, May and November.
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Acknowledgments
Warm thanks are due to the Staff of the Lab. of Ecologia de Peixe/UERJ for their long-term support. During the years, the authors benefitted from several Brazilian financial sources: R. Mazzoni was supported by a CNPq grant No. 300481/2010-0 and two FAPERJ projects No. E/26-170.578/2006 and No. E/26-110.225/2009. The senior author was supported by Brazilian CAPES Agency through the program “Ciencia sem fronteiras—Project No. 08-2012”.
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Lobon-Cervia, J., Mazzoni, R., Iglesias-Rios, R. et al. Persistence and instability typify the fish assemblage structure of Rio Ubatiba, a Neotropical stream of South-east Brazil. Environ Biol Fish 99, 15–25 (2016). https://doi.org/10.1007/s10641-015-0450-0
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DOI: https://doi.org/10.1007/s10641-015-0450-0