Diversidade e ocorrência de peixes na área de influência da UHE Mogi Guaçu e lagoas marginais, bacia do alto rio Paraná, São Paulo, Brasil

Gonçalves, Cristina da Silva; Braga, Francisco Manoel de Souza

doi:10.1590/s1676-06032008000200012

Cited by 13 publications

(18 citation statements)

References 31 publications

(36 reference statements)

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“…This ratio relates the overlap of the abundance and biomass curves and allows an interpretation of the environmental condition based on the fauna (WARWICK et al, 1987;OTERO, 2006;BRAGA, 2008). This is a method for assessing the status of polluted areas based in local populations, without the need for reference of the temporal or spatial series of controlled samples (WARWICK, 1986).…”

Section: Discussionmentioning

confidence: 99%

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

et al. 2017

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Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)The aim of this study was to investigate the ichthyofauna structure in the region of the north outfall of the Bertioga Channel (São Paulo, Brazil) and the possible effects of the environmental quality loss. The samples were collected in a monthly basis, from September to December 2005, at two oceanographic stations with an otter-trawl. The fish fauna structure was evaluated by ecological indicators and the environmental quality evaluated by the ABC analysis and the Estuarine Fish Communities Index (EFCI). A total of 1553 individuals from 50 species were sampled. Ariidae and Sciaenidae amounted to 60 % and Cathorops spixii represented 36 % of all specimens collected. The highest richness and ecological diversity were recorded in December, while the highest numerical abundance was found in October. The majority of the species were represented by juveniles. The cluster analysis and canonical correspondence analysis showed a consistent and clear difference between the sampling stations, and the abiotic factors analyzed (temperature, depth and salinity) do not seem to have influence on the community structure. The ABC analysis suggested a moderate disturbed environment and the EFCI allowed classifying the area as "poor", due to the 12 metrics analyzed, concerning the reduction of the species diversity, composition and abundance, and modifications in the nursery function and trophic integrity of the area.

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Section: Discussionmentioning

confidence: 99%

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

et al. 2017

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“…Other characteristics are: barrage with extension of 150 m, water fall with 7 m, two installed turbines, four flood gates and a fish ladder with 21 step-tanks for fish passage (Brandimarte et al, 2005;AESTietê, 2011). At the sampled site, bottom is muddy or sandmuddy, maximum depth is around 5 m and the border vegetation is dominated by sugar cane and pastures (Gonçalves & Braga, 2008). The analysis of temperature and rainfall in the studied area (average of 30 years, 1971 to 2005, data from meteorological station D4-100 located at Campininha farm) allowed the determination of dry (April to September) and wet (October to March) periods.…”

Section: Study Areamentioning

confidence: 99%

“…The damming of rivers transforms the aquatic environment (Castro & Arcifa, 1987;Nilsson et al, 2005), which favors some fish species, but has deleterious effects in others. Species that are able to adapt to the lentic environment created by the dam can be benefited by the change, becoming abundant or even dominant in these environments, such as fishes of Curimatidae family (Castro & Arcifa, 1987;Barbieri, 1995;Loureiro-Crippa & Hahn, 2006;Novakowski et al, 2007;Gonçalves & Braga, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reproductive strategies of two Curimatidae species in a Mogi Guaçu impoundment, upper Paraná River basin, São Paulo, Brazil

2012

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Considering that reproduction studies are fundamental to understand the life cycle of organisms, this study aimed to investigate the reproductive strategies of saguirus Cyphocharax nagelii and Steindachnerina insculpta in a dam of Mogi Guaçu River, (SP). Specimens were collected between August 2005 and July 2006 using gillnets with mesh sizes ranging from 1.5 to 5.0 cm between adjacent knots. Reproductive dynamics, body condition, reproductive period, spawning type and fecundity were analyzed in both species. The body condition reflected the reproductive dynamics, and differed significantly between the wet and dry seasons. During the dry season, the feeding activity and the accumulation of fat in the visceral cavity were higher. The reproductive period of both species covered the months between August and February, with peaks in October and December, and the distribution of the diameters of oocytes allowed to classify them as total spawners. The fecundity increased with weight and length, reaching 28,800 and 27,906 oocytes per female for C. nagelii and S. insculpta, respectively, whereas the amplitude of oocyte diameters varied between 50-1025 µm for the former and 75-975 µm for the later species. Taking into account that species with different reproductive strategies also respond differently to environmental impacts, our findings provide important information to subsidize management plans for these curimatid species.Considerando que o conhecimento da reprodução é fundamental para a compreensão do ciclo de vida dos organismos, este trabalho buscou avaliar as estratégias reprodutivas dos saguirus Cyphocharax nagelii e Steindachnerina insculpta em um represamento no rio Mogi Guaçu (SP). Os exemplares foram coletados entre agosto de 2005 e julho de 2006 com redes-de-espera (com tamanhos de malha variando entre 1,5 e 5,0 cm entre nós adjacentes). A dinâmica reprodutiva, a condição corporal, o período reprodutivo, o tipo de desova e a fecundidade foram os parâmetros reprodutivos analisados nas duas espécies. A condição corpórea refletiu a dinâmica reprodutiva, sendo significativamente diferente entre os períodos seco e chuvoso. Durante o período seco, a atividade alimentar e o acúmulo de gordura na cavidade visceral foram maiores. O período reprodutivo das duas espécies abrangeu os meses entre agosto e fevereiro, com picos em outubro e dezembro, e a distribuição dos diâmetros de ovócitos permitiu classificá-las como desovadoras totais. A fecundidade aumentou com o peso e com o comprimento, atingindo em média 28.800 e 27.906 ovócitos por fêmea, para C. nagelii e S. insculpta, respectivamente, ao passo que a amplitude de diâmetros ovocitários variou de 50 a 1.025 µm para a primeira e de 75 a 975 µm para a segunda espécie. Considerando que espécies com estratégias reprodutivas diferentes também respondem de modos diferentes aos impactos ambientais, as informações obtidas são importantes subsídios para nortear medidas de manejo para essas espécies de curimatídeos.

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“…The most abundant species in the Upstream Lake and Upstream Channel sites belong to different feeding guilds (omnivores and carnivores), which we hypothesise facilitates their coexistence and dominance at these sites (Sá‐Oliveira et al ., ). The omnivorous H. unimaculatus is considered an opportunistic species with great ecological plasticity in adapting to environmental changes (Petesse, Petrere & Spigolon, ; Gonçalves & Braga, ). On the other hand, A. ucayalensis is a generalised piscivore that ingests whole prey, which distinguishes it in at least one niche dimension from another dominant predator in the area, Serrassalmus gibbus , which cuts its prey into pieces before swallowing.…”

Section: Discussionmentioning

confidence: 97%

Upstream and downstream responses of fish assemblages to an eastern Amazonian hydroelectric dam

et al. 2015

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Major hydroelectric dams are proliferating in tropical regions such as Amazonia, where extensive new hydropower developments are planned despite potentially severe ecological and social impacts. The status of freshwater biota in the vicinity of existing dams could be valuable to predict the effects of such developments, but detailed ecological monitoring before and after dam construction is frequently lacking. In the absence of these data, we used a space-for-time replacement to compare a key component of the aquatic biota at upstream and downstream sites, with the latter more closely resembling river channel conditions prior to the dam. We assessed the fish assemblages upstream and downstream of the Coaracy Nunes Dam in Amapá, Brazil, the first ecological study at this site since this dam was constructed 42 years earlier. We used gillnets during eight bimonthly field campaigns, covering both wet and dry seasons, and sampled the ichthyofauna (1819 individuals, 81 species) at four sites: Downstream Channel, Reservoir, Upstream Lake and Upstream Channel. We found clear negative impacts on the abundance, biomass, species richness, alpha diversity and species dominance upstream of the dam. The physical subdivision of the river channel and the upstream channel conversion from lentic to lotic habitats were strongly associated with differences in the composition and structure of fish communities. Notable changes include an increased contribution of small-bodied fish in the reservoir and an absence of long-distance migrants upstream of the dam. Downstream channel habitats, in particular, retained their fish diversity with high conservation value typical of eastern Amazonia, yet these areas now face the threat of new hydropower development farther downstream. The long-term impacts on aquatic biodiversity highlighted in this study are especially relevant in the face of burgeoning new hydroelectricity development plans for rivers across lowland Amazonia

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Diversidade e ocorrência de peixes na área de influência da UHE Mogi Guaçu e lagoas marginais, bacia do alto rio Paraná, São Paulo, Brasil

Cited by 13 publications

References 31 publications

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

Reproductive strategies of two Curimatidae species in a Mogi Guaçu impoundment, upper Paraná River basin, São Paulo, Brazil

Upstream and downstream responses of fish assemblages to an eastern Amazonian hydroelectric dam

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