2012
DOI: 10.1590/s1679-62252012000400017
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Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances

Abstract: Natural and induced disturbances greatly influence the temporal distribution of ichthyoplankton abundance. This study assesses and compares the temporal variability of fish larvae assemblages in controlled and free environments to determine the influence of environment variables on the main taxa in these systems. The study was conducted at the Chapecó (without dam impact) and Ligeiro (with dam impact) river mouths, which are located in the upper Uruguay River. Samples were made between October 2001 and March 2… Show more

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Cited by 20 publications
(16 citation statements)
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“…Despite the difference in the number of captured species between the two environments, the primary fish orders found both in the pool and in the rapids were the Characiformes and Siluriformes. The dominance of these two orders has also been described by several authors for the neotropical freshwater region (Agostinho et al, 1997;Lowe-McConnell, 1999;Agostinho et al, 2003;Reynalte-Tataje et al, 2012b). The larvae assemblage found in the Peixe River was primarily composed of sedentary species, which tend to exhibit opportunistic features, i.e., small and medium sized, few eggs, do not perform large migrations and have no parental care (Vazzoler, 1996).…”
Section: Discussionsupporting
confidence: 57%
“…Despite the difference in the number of captured species between the two environments, the primary fish orders found both in the pool and in the rapids were the Characiformes and Siluriformes. The dominance of these two orders has also been described by several authors for the neotropical freshwater region (Agostinho et al, 1997;Lowe-McConnell, 1999;Agostinho et al, 2003;Reynalte-Tataje et al, 2012b). The larvae assemblage found in the Peixe River was primarily composed of sedentary species, which tend to exhibit opportunistic features, i.e., small and medium sized, few eggs, do not perform large migrations and have no parental care (Vazzoler, 1996).…”
Section: Discussionsupporting
confidence: 57%
“…The net was maintained against the direction of flow facing the fastest current. Surface tows have consistently captured larvae of diverse migratory fish species in the Upper Paraná River Basin (Sanches et al , ; Baumgartner et al , ; Daga et al , ; Reynalte‐Tataje et al , ; Gogola et al , ) and neighbouring Uruguay River Basin (Hermes‐Silva et al ., ; Corrêa et al , ; Reynalte‐Tataje et al , , ).…”
Section: Methodsmentioning
confidence: 99%
“…The region of the upper Uruguay River is formed by well-embedded and rather steep valleys, with absence of floodplain (Reynalte-Tataje et al, 2012b). This environment favors a flash floodongs with rapid rise in hours during periods of heavy rainfall (Corrêa et al, 2011).…”
Section: E160084[2]mentioning
confidence: 99%