Influence of lagoons size and prey availability on the wading birds (Ciconiiformes) in the upper Paraná river floodplain, Brazil

Gimenes, Márcio Rodrigo; Anjos, Luiz dos

doi:10.1590/s1516-89132006000400015

Cited by 14 publications

(8 citation statements)

References 27 publications

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“…Among the studied habitats, the connected lagoons could be considered the higher-quality patches in terms of fish abundance, but caution should be warranted in this interpretation. On the same area, Gimenes and Anjos (2006) observed that the sampling with seining nets in the periphery of the lagoons yielded better estimates of prey availability for Ciconiiformes than sampling with gill nets in the deeper areas because fishes captured by each method were differentially vulnerable to predation by the birds. Furthermore, the rivers and channels were not sampled with seining nets, which limited the applicability of initial statement as above.…”

Section: Discussionmentioning

confidence: 95%

“…The results can help to understand whether in the wading bird communities, foraging habitat selection is really simply opportunistic or whether there are differences among the species, and how the hydrologic cycle influence this process. There have been few studies on Ciconiiformes in Brazil (Willis, 1995;Petry and Hoffmann, 2002;Bouton and Frederick, 2003;Gimenes and Anjos, 2006;Mestre et al, 2007). But this is the first study to quantitatively analyze the use of foraging habitats by the community.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative analysis of foraging habitat use by ciconiiformes in the upper Paraná river Floodplain, Brazil

Gimenes

Anjos

2011

Braz. arch. biol. technol.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of foraging habitat use by ciconiiformes in the upper Paraná river Floodplain, Brazil

Gimenes

Anjos

2011

Braz. arch. biol. technol.

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“…At least 15 species of Ciconiiforms live closely associated to aquatic environments of the upper Paraná River floodplain. During low water season, however, they exhibit habitat preference for lakes permanently connected to the main river and secondary channels, which are greater in size and perimeter (Gimenes & dos Anjos, 2006). The reference sites (REF) were included in our experimental design to overcome a possible effect of these non-piscine piscivorous, in addition to control for trahira density manipulation (either addition, HM?…”

Section: Discussionmentioning

confidence: 99%

The role of the predatory trahira (Pisces: Erythrinidae) in structuring fish assemblages in lakes of a Neotropical floodplain

et al. 2010

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We performed an experimental manipulation of trahira Hoplias aff. malabaricus in a series of isolated lakes of the upper Paraná River floodplain to evaluate its short-term impact on the structure of fish assemblages. The effects of trahira density (treatment groups: addition, removal, and reference) in two habitat categories (open and macrophyte-covered areas) on attributes of the fish assemblage structure were evaluated (using rm-ANOVA) over 120 days. Reductions in species richness were recorded in all assemblages and were more pronounced at the end of the experiment within macrophyte-covered areas of the lakes where H. aff. malabaricus was removed. In these lakes, the number of fish was also significantly smaller and evenness was significantly higher than in those in which trahira were added or maintained at natural densities. The increase of the relative abundance of all size classes over the first 60 days on the assemblages where trahira was present, and the decrease of the small-sized fish where trahira was absent contributed to the lack of pronounced alterations in total biomass. The absence of the predator from its preferred habitat was found to negatively affect the less abundant species, which seemed to be highly sensitive to the effects of interspecific competition among prey species. In addition to the wellknown effects of hydrological seasonality, the role played by native predators might be important in determining the persistence of local species in the fish assemblages of Neotropical floodplains.

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“…This stage of the hydrological cycle presents suitable body conditions to allow large migratory piscivores to restore their reserves, which become depleted in the migratory and reproductive processes (Agostinho et al, 2007a;Abujanra et al, 2009). Similar tendencies were reported by Gimenes and Dos Anjos (2006) for wading birds in the upper Paraná River floodplain.…”

Section: Variations In Body Conditionmentioning

confidence: 67%

Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain

et al. 2009

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Flood pulses affect floodplain enrichment via the incorporation of nutrients and terrestrial biomass. As a result, they positively affect the body condition of aquatic organisms. This paper evaluates whether the absence of floods (resulting from dam control) affects the feeding activity and body condition of piscivorous fish. In addition, whether piscivores respond similarly to alterations in the flooding regime was assessed. Five piscivorous species were selected (Acestrorhynchus lacustris, Hoplias aff. malabaricus, Plagioscion squamosissimus, Rhaphiodon vulpinus, and Salminus brasiliensis). The fish were captured in four distinct years and in three river subsystems with differentiated water level fluctuations (Ivinheira = not regulated; Baía = regulated by the Paraná River level; Paraná = regulated by dams). Feeding activity and body condition were evaluated using the mean values of the standard residuals generated by regression models between body and stomach weights and standard length and body weight (all log-transformed). Differences among years and subsystems were evaluated via two-way analysis of variance. Pearson and Spearman correlations were performed between flooding attributes (duration, amplitude, timing, and daily variability) and feeding activity and body condition. Feeding activity differed across subsystems, whereas body condition varied across years, depending on the subsystem. Hoplias aff malabaricus (an ambusher adapted to starvation) presented feeding activity independent of the flooding regime and also presented better body condition in times of high water levels. Rhaphidon vulpinus exhibited variations in feeding activity but did not present alterations in body condition. The other species presented poorer body condition in years or subsystems with regular floods. Correlations identified that the duration and timing of floods had negative effects on body condition, whereas amplitude and mean annual water level improved feeding activity. Therefore, regular floods affect the feeding activity and body condition of piscivorous fish, and the response of each species depends on the existence or absence of pre-adaptation to long periods of starvation. Consequently, considering the role of the flood pulse in determining the availability of feeding resources for early life stages of piscivores, control of the flood pulse by dams is also disadvantageous for piscivorous fish.Keywords: floodplain, flood pulses, piscivorous, Paraná River. Efeitos do regime de cheias sobre a atividade alimentar e condição corporal de peixes piscívoros na planície de inundação do Alto Rio Paraná ResumoOs pulsos naturais de cheias são considerados fundamentais para o sucesso no recrutamento de peixes e no enriquecimento das planícies de inundação pela incorporação de nutrientes e biomassa terrestre, atuando positivamente na condição dos organismos aquáticos. O presente trabalho pretende avaliar se a ausência dos pulsos anuais, resultantes do controle por reservatórios hidrelétricos, afeta a atividade alimentar e ...

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Influence of lagoons size and prey availability on the wading birds (Ciconiiformes) in the upper Paraná river floodplain, Brazil

Abstract: The influence of lagoons size and prey availability on the Ciconiiformes in the upper

Cited by 14 publications

References 27 publications

Quantitative analysis of foraging habitat use by ciconiiformes in the upper Paraná river Floodplain, Brazil

Quantitative analysis of foraging habitat use by ciconiiformes in the upper Paraná river Floodplain, Brazil

The role of the predatory trahira (Pisces: Erythrinidae) in structuring fish assemblages in lakes of a Neotropical floodplain

Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain

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