Ecological studies on the fish community of Salto Grande Reservoir, Paranapanema River Basin, São Paulo, Brazil

In order to analyze the time-space variation of the fish fauna in the surf zone fish communities at Ilha do Cardoso State Park, São Paulo, Brazil, four consecutive hauls were done over a year on three beaches with different degrees of exposure, at low and high tide. To evaluate the influence of each abiotic variable over the fish community, a Canonical Correspondence Analysis was conducted. We identified 7,286 individuals belonging to 20 families and 47 species, most specimens collected were juveniles. At low tide, the highest diversity and richness values were calculated while the highest dominance was obtained at high tide. As for the number of species collected at the three beaches, stood out for the lower values the cooler months, between June and September. Abiotic variables explained 41.3% of the variability of biological data, where 11.4% corresponds to the spatial variation. Meanwhile the temporal variables accounted for 31.9% of the variation in abundance, where 26.3% of the variance explained nycthemeral variation. Additionally two groups were clearly observed between months with low and high temperature. However in this variable, the tidal variation, excluding the seasonal effect, explained 6.2%, while seasonality, excluding tide effect, explained 26.3%. Although the main measurable seasonal changes were related to temperature, water temperature showed a low percentage of explanation in the fish fauna variability (2.7%). Finally, it is emphasized that the seasonal changes in surf zone fish community primarily reflect patterns of recruitment determined by the reproductive activity and coastal circulation.

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Analysis of fish communities along a rural–urban gradient in a neotropical stream (Piracicaba River Basin, São Paulo, Brazil)

Hydrobiologia ◽

10.1007/s10750-009-0060-y ◽

2010 ◽

Vol 641 (1) ◽

pp. 97-114 ◽

Cited By ~ 34

Author(s):

Cleber Valim Alexandre ◽

Katharina Eichbaum Esteves ◽

Mônica Accaui Marcondes de Moura e Mello

Keyword(s):

River Basin ◽

Fish Communities ◽

Sao Paulo ◽

São Paulo ◽

Urban Gradient ◽

Neotropical Stream ◽

Piracicaba River

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Ichthyofauna of the Una river in the Paraíba do Sul Paulista River Valley, Southeastern of Brazil

Biota Neotropica ◽

10.1590/10.1590/1676-0611-bn-2018-0528 ◽

2018 ◽

Vol 18 (4) ◽

Cited By ~ 2

Author(s):

Juliano Rodrigues Honorio ◽

Itamar Alves Martins

Keyword(s):

River Basin ◽

New Records ◽

Sao Paulo ◽

The State ◽

River Valley ◽

São Paulo ◽

Number Of Individuals ◽

Fyke Nets ◽

Paraíba Do Sul River

Abstract: This study focus on an inventory of the ichthyofauna of the Una river, a tributary of the Paraíba do Sul river, located in the region of Paraíba do Sul River Valley, in the State of São Paulo. Sampling was carried out in three sampling areas along the channel of the Una river between April 2016 and March 2017. For the collection of fish specimens, was used angling, fyke nets, cast nets, dragnets and hand nets. A total of 1.534 specimens were collected, which corresponds to five different orders, 14 families, 26 genera and thirty species. The study revealed that the most significant number of reported species are from the orders Siluriformes and Characiformes. The Characidae family was the most representative concerning the wealth of species and Astyanax aff. bimaculatus (two spot Astyanax | lambari-do-rabo-amarelo) was the species with the highest number of individuals captured. The freshwater ichthyofauna of the Una river is composed of eight species considered allochthonous and one exotic. Of the thirty species listed in this study, five are new records for the Paraíba do Sul river basin.

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Assessment of hydrokinetic energy resources downstream of hydropower plants in the Tietê River Basin, São Paulo State, Brazil

Frontiers of Science and Technology ◽

10.1515/9783110537680-005 ◽

2017 ◽

pp. 61-82

Keyword(s):

River Basin ◽

Sao Paulo ◽

Energy Resources ◽

São Paulo ◽

Hydrokinetic Energy ◽

Paulo State ◽

Tietê River ◽

Hydropower Plants ◽

São Paulo State

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Morphometric analysis of an Areal Watershed in Taubaté, SP, Brazil

Ambiente e Agua - An Interdisciplinary Journal of Applied Science ◽

10.4136/ambi-agua.2344 ◽

2019 ◽

Vol 14 (7) ◽

pp. 1

Author(s):

Vicente Rodolfo Santos Cezar ◽

Marcelo Dos Santos Targa ◽

Celso De Souza Catelani

Keyword(s):

Land Use ◽

River Basin ◽

Morphometric Analysis ◽

High Surface ◽

High Capacity ◽

Sediment Concentration ◽

Sao Paulo ◽

São Paulo ◽

Circularity Index

In 1991, the Integrated Water Resources Management System (SIGRHI) in the State of São Paulo adopted the watershed as a territorial unit for studies, integrated planning and sustainable development. The morphometric analysis of small watersheds, which involves the characterization of geometric parameters, relief, drainage network, combined with land use and occupation, may constitute an important model for environmental analysis of larger watersheds. This study aimed at characterization of the morphometry in the Areal river basin, in the city of Taubaté, São Paulo. The study found 1.89 km² of area, 7.44 km of perimeter and 3.11 km in length of the basin axis, which allowed the calculation of the compactness coefficient (Kc = 1.51), form factor, (F = 0.195) and circularity index (CI = 0.43), indicating that under normal precipitation conditions, this basin is unlikely to be flooded, due to the distance from the unit, leading to smaller concentrate outflow. The results obtained for the Maintenance Coefficient (Cm) indicate that 260 m² is required to maintain each meter of perennial channel. The high values of drainage density (Dd = 3.35 km.km-2) and sinuosity index (Is = 0.95) indicate that drainage channels in the area are rectilinear, thus suggesting the occurrence of a high surface runoff associated with high dissection. The analysis of land use and occupation revealed that, from the seven types of vegetation cover, the dominant cover in the Areal basin is 0.756 km2 (40%) constituted of pasture, while forest represents 0.580 km2 (31%), 0.321 km2 (17%) of the land cover is constituted of degraded forest. In terms of conservation, the Areal basin is conserved because, besides being located in the environmental preservation area of the Una River Basin, it is located at the meeting of two ecological corridors and is occupied by only 8 families of rural producers. On the other hand, the creation of approximately 120 head of cattle in the upper part of the basin and the existence of gully erosion of the order of 0.018 km2 (1%) of the basin area, which led to increased runoff and sediment concentration in the flat areas marginal to the creek of Areal. Based on morphometric analysis, it was concluded that: Areal watershed presents high capacity to form new watercourses and their relief characteristics, with low sinuosity channels and high values of altimetric amplitude, channel gradient, and density. Drainage, allied to the existence of erosive processes, favors sediment flow and transport. Conservation actions are required to control erosion.

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