Abstract
ABSTRACT Given the importance of fish movement to the dynamics and maintenance of stream dwelling fish communities from the Atlantic Forest, we analysed patterns of fish movement in a coastal stream from Southeastern Brazil, using mark-recapture technique. Displacement distance of each species were presented and discussed considering seasonal (rainy and dry) and body size patterns. We marked 10 species along the stream and recaptured 440 (34.6%) of the 1,270 marked fishes. The species with significant number of upstream moving individuals were Astyanax janeiroensis, Characidium interruptum, Astyanax hastatus, Parotocinclus maculicauda and Awaous tajasica. Only Pimelodella lateristriga presented significant differences between resident and moving individuals. Characidium interruptum and A. tajasica demonstrated greater downstream and upstream movement, respectively, moving up to 2,100 m. Even after controlling for species identity we found no significant correlation between fish length and individual displacement distance. Fishes moved longer distances during the rainy season, in accordance to the breeding season. Patterns of fish movement were in agreement to life-history traits of many of the studied species and can be reflecting specific behaviour and morphologies.
Highlights
An individual movement can be defined as a change in position in a certain time interval
Movement is essential for several ecological processes, such as population or individual dispersion, metapopulation dynamics, local species richness, local and regional population dynamics as well as local fitness opportunities (Gilliam, Fraser, 2001; Mazzoni et al, 2015)
Long spawning migration can occur in some fish groups, such as salmonids and large migratory fishes from Amazon and Paraná basins (Goulding, 1980; Winemiller, Jepsen, 1998; Antonio et al, 2007; Fernadez et al, 2007; Pesoa, Schulz, 2010; Tejerina-Garro, Mérona, 2010)
Summary
An individual movement can be defined as a change in position in a certain time interval. It is a consequence of processes acting at multiple spatial and temporal scales (Nathan et al, 2008). Stream fish movements can be performed through a short or a long distance. Short distance movements (local) are generally related to changes in resources availability (Albanese et al, 2004), like food or refuge (Gowan, Fausch, 2002; Gowan, 2007), predation risk (Roberts, Angermeier, 2007), or to abiotic conditions like salinity, stream flow (Branco et al, 2017; Romão et al, 2017), and dissolved oxygen (Branco et al, 2016). Fish movements in streams can be important for the fish community stability (Martin-Smith et al, 1999)
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