Diversity and stability of fishes (Teleostei) in a temporary river of the Brazilian semiarid region

Medeiros, Elvio Sergio Figueredo; Maltchik, Leonardo

doi:10.1590/s0073-47212001000100016

Cited by 15 publications

(16 citation statements)

References 9 publications

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“…The relative contribution of each species to the total amount of fish collected (expressed in percentage) and their frequencies of occurrence in the samples were estimated. The relative contribution of each species was used as a measure of dominance (Medeiros & Maltchik, 2001). The frequency of occurrence (as percentage) of each species at each sampling site was computed by dividing the number of samples in which the species was present by the total samples and multiplying by 100.…”

Section: Discussionmentioning

confidence: 99%

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

Rosso

Quirós

2010

Neotrop. ichthyol.

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The Pampa Plain, in the central region of Argentina, is mostly drained by the Salado River. The fish fauna of this river is mostly known from field collections in lower reach lakes. Consequently, we aimed to explore the composition and structure of the fish assemblages in the upper Salado River lakes. Patterns in dominance and persistence of species and assemblage level attributes were correlated with environmental and human activity-derived (NO 3 :NH 4 ) variables. Overall, 19,913 individuals of 17 species included in 5 orders and 11 families were collected. Several species are first records for the upper Salado River lakes. There was a marked proliferation of species in the family Characidae. Conversely, the remainder 10 families were only represented by one or two species. The species composition along the study lakes changed slightly but their relative contribution to the total fish collected (dominance) varied greatly. Rather few species were present in all collections suggesting an important interannual variability in assemblage stability. The gradient in water conductivity was an important factor for the persistence of particular species in the lakes. The gradients in water conductivity and NO 3 :NH 4 ratio were associated with particular fish communities dominated by different groups of species. These results suggest that even when broad management and conservation strategies should encompass the system as a whole, lake-specific approaches must also be addressed. Overall, our results highlight that human impacts on surface waters may interact with environmental factors to influence the dynamics of fish species and the structure of their communities.A planície pampeana, na região central da Argentina, é em grande parte drenada pelo rio Salado. A ictiofauna desse rio é conhecida principalmente pelos estudos conduzidos nos lagos dos segmentos inferiores do rio. Em consequência, procuramos examinar a composição e a estrutura das assembleias de peixes dos lagos do alto rio Salado. Os padrões na dominância e persistência das espécies e os atributos das assembleias de peixes foram correlacionados com variáveis ambientais e variáveis indicadoras de perturbações antropogênicas (NO 3 :NH 4 ). Foram coletados 19913 indivíduos de 17 espécies pertencentes a 5 ordens e 11 famílias. Várias espécies foram registradas pela primeira vez para as lagoas do alto rio Salado. Houve uma marcada proliferação de espécies da família Characidae. Em contraste, as 10 famílias de peixes restantes foram representadas por uma ou duas espécies. A composição de espécies variou pouco ao longo dessas lagoas mas sua contribuição ao total de peixes coletados (dominância) foi muito variável. Poucas espécies estiveram presentes em todas as coletas, sugerindo uma importante variação interanual na estabilidade da assembleia de peixes. O gradiente na condutividade elétrica da água foi importante fator para a persistência de algumas espécies nessas lagoas. A condutividade elétrica da água e o gradiente na relação NO 3 :NH 4 estiveram associados com...

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Section: Discussionmentioning

confidence: 99%

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

Rosso

Quirós

2010

Neotrop. ichthyol.

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“…Furthermore, during this phase, the water retention in semipermanent and temporary pools represents refugia for the maintenance of aquatic species [9]. These small patchy ecosystems have been argued to contribute disproportionately to the regional assemblage of species given their high local diversity [10,11].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Zooplankton Diversity across Temporary Pools in a Semiarid Intermittent River

Melo

Medeiros

2013

International Journal of Biodiversity

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This study describes the richness and density of zooplankton across temporary pools in an intermittent river of semiarid Brazil and evaluates the partitioning of diversity across different spatial scales during the wet and dry periods. Given the highly patchy nature of these pools it is hypothesized that the diversity is not homogeneously distributed across different spatial scales but concentrated at lower levels. The plankton fauna was composed of 37 species. Of these 28 were Rotifera, 5 were Cladocera, and 4 were Copepoda (nauplii of Copepoda were also recorded). We showed that the zooplankton presents a spatially segregated pattern of species composition across river reaches and that at low spatial scales (among pools or different habitats within pools) the diversity of species is likely to be affected by temporal changes in physical and chemical characteristics. As a consequence of the drying of pool habitats, the spatial heterogeneity within the study river reaches has the potential to increase diversity during the dry season by creating patchier assemblages. This spatial segregation in community composition and the patterns of partition of the diversity across the spatial scales leads to a higher total diversity in intermittent streams, compared to less variable environments.

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“…The severe hydrological fluctuation induced by the intervening flood dynamics are one of the most important factors affecting the stability of communities (Medeiros & Maltchik, 2001). In spite of this, fish assemblages tend to have certain resilience and re-establish themselves in the long term.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, the persistence or existence of fish assemblages in any habitat also depends upon other biotic (competition, depredation, nutritional, morphologic and physiological aspects) and abiotic factors (physicalchemical parameters of the water, food availability and refuge). Also, Medeiros & Maltchik (2001) and Thomaz et al (2007) suggested that spatial heterogeneity is important to the maintenance of stability and diversity in communities subjected to disturbances.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, in order to understand assemblage stability, it is fundamental that we understand those factors that may vary among ecosystems and that may influence the persistance of populations, these include varying interspecies interactions, geomorphologies and disturbance regimes. Therefore, by studying the stability of associations, one can learn about the behaviour of those systems influenced not only by wet and dry periods, but also by human impacts (Freeman et al, 1988;Medeiros & Maltchik, 2001). However, more long-term studies of ecological characteristics are needed if one is to have a better understanding of the stability or persistence in fish assemblages (Freeman et al, 1988;Grossman et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Stability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River

2009

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Fish assemblage structure and variability were analyzed in two floodplain lagoons (Las Arhuacas and Los Cardonales) along the lower Orinoco over a hydrological cycle. Every three months during continuous three-day sampling, experimental gill nets (5 to 12.5 cm of mesh opening) and 1 mm-mesh seine nets were utilized according to the types of habitats presents. A total of 133 fish species were found in Las Arhuacas and 95 species in Cardonales. Fifty five and 17 species were exclusive to Las Arhuacas and Los Cardonales respectively, and 77 were common to both lagoons. In Las Arhuacas, the most speciesrich orders were Characiformes, Siluriformes, Perciformes and Gymnotiformes and in Los Cardonales, the most species-rich orders were Characiformes, Siluriformes, Clupeiformes and Perciformes. The richness, abundance and biomass were significantly higher (p < 0.001) in Arhuacas than in Cardonales. In general, the fishes assemblage was highly variable during the high water phase and moderately stable during low water phase in both lagoons, with more stability or less variability in Cardonales than Arhuacas. Also, there were significant differences in the fish assemblages between the two lagoons, mainly during low waters (ANOSIM; p < 0.001). The species that contributed most to the mean dissimilarity between the lagoons were Hypostomus argus, Aphanotorulus ammophilus, Potamorhina altamazonica, Prochilodus mariae, Loricaria gr. cataphracta, Oxydoras sifontesi, Hydrolycus armatus, Hyphopthalmus edentatus and Pterodoras rivasi. The last four species were more commonly collected in Los Cardonales. Also, the species of small size (mainly SL < 5 cm) such as Rhinosardinia amazonica, Moenkhausia sp. 1 "lepidura", Moenkhausia sp. 2, Aphyocharax alburnus, Characidium sp. 1, Moenkhausia sp. 3, Exodon paradoxus and Roeboides dientonito contributed to the mean dissimilarity among the beach and aquatic vegetation habitats. The patterns of the species assemblage organization were related to the dynamics of the floods. Non-random (i.e., deterministic) associations between species caused by the selection of habitats and/or to biological interactions, apparently were more common during low waters when there is an increased density of fish and so the biotic interactions are intensified. Stochastic associations, on the other hand, seemed to be more common during high water when species are more dispersed.Foram analisadas a estrutura e a variabilidade da comunidade de peixes ao longo de um ciclo hidrológico em dois lagos (Arhuacas e Cardonales) da planície de inundação do baixo rio Orinoco. Amostragens trimestrais foram realizadas por meio de coletas contínuas durante três dias, utilizando-se redes de espera experimentais (5 a 12,5 cm de malha) e redes de arrasto (1 mm de malha), de acordo com os tipos de habitats presentes. Foi encontrado um total de 133 espécies de peixes em Arhuacas e 95 espécies em Cardonales. Cinquenta e cinco espécies foram exclusivas do lago Arhuacas, 17 do lago Cardonales, e 77 foram comuns a ambos os lagos. Em Arhua...

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Diversity and stability of fishes (Teleostei) in a temporary river of the Brazilian semiarid region

Cited by 15 publications

References 9 publications

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

Spatial Distribution of Zooplankton Diversity across Temporary Pools in a Semiarid Intermittent River

Stability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River

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