Length-weight relationships of 10 freshwater fish species from an intermittent river basin, semi-arid region, Brazil

2017 ◽  
Vol 33 (4) ◽  
pp. 832-834 ◽  
Author(s):  
B. F. Terra ◽  
F. K. Teixeira ◽  
C. F. Rezende
Keyword(s):  
Freshwater Fish ◽  
River Basin ◽  
Fish Species ◽  
Arid Region ◽  
Freshwater Fish Species ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Intermittent River

scholarly journals Application of Markov chains to Standardized Precipitation Index (SPI) in São Francisco River Basin

2019 ◽  
Vol 14 (3) ◽  
pp. 1
Author(s):  
Esdras Adriano Barbosa dos Santos ◽  
Tatijana Stosic ◽  
Ikaro Daniel de Carvalho Barreto ◽  
Laélia Campos ◽  
Antonio Samuel Alves da Silva
Keyword(s):  
Markov Chains ◽  
River Basin ◽  
Arid Region ◽  
Standardized Precipitation Index ◽  
Precipitation Index ◽  
Severe Drought ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Semi Arid Region ◽  
Semi Arid

This work evaluated dry and rainy conditions in the subregions of the São Francisco River Basin (BHSF) using the Standardized Precipitation Index (SPI) and Markov chains. Each subregion of the BHSF has specific physical and climatic characteristics. The data was obtained from the National Water Agency (ANA), collected by four pluviometric stations (representative of each subregion), covering 46 years of data, from 1970 to 2015. The SPI was calculated for the time scales of six and twelve months and transition probabilities were obtained using the Markov chain. Transition matrices showed that, at both scales, if the climate conditions were severe drought or rainy, switching to another class would be unlikely in the short term.  Correlating this information with the probabilities of the stationary distribution, it was possible to find the regions that are most likely to be under rainy or dry weather in the future. The recurrence times calculated for the stations that belong to the semi-arid region were smaller when compared to the value of the return period of the representative station of Upper São Francisco that has higher levels of precipitation, confirming the predisposition of the semi-arid region to present greater chances of future periods of drought.

scholarly journals Stable isotopic and geochemical characteristics of groundwater in Kherlen River basin, a semi-arid region in eastern Mongolia

2007 ◽  
Vol 333 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Maki Tsujimura ◽  
Yutaka Abe ◽  
Tadashi Tanaka ◽  
Jun Shimada ◽  
Satoru Higuchi ◽  
...  
Keyword(s):  
River Basin ◽  
Arid Region ◽  
Geochemical Characteristics ◽  
Stable Isotopic ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Eastern Mongolia

scholarly journals An environmental analysis of the acaraú river basin, Brazilian northeastern region

2020 ◽  
Vol 4 (3) ◽  
pp. 117-123
Author(s):  
Vanda Claudino-Sales
Keyword(s):  
Sustainable Development ◽  
Water Resources ◽  
River Basin ◽  
Environmental Degradation ◽  
Environmental Analysis ◽  
Arid Region ◽  
Hydrographic Basin ◽  
Semi Arid Region ◽  
Regional Authorities ◽  
Semi Arid

The rivers and their watersheds are fundamental elements of socioeconomic activities. In this article, we analyze the hydrographic basin of the Acaraú River, situated in the northeast of Brazil, from its geoenvironmental aspects, based on the perspective of the geosystem. In this perspective, a geoenvironmental picture of the hydrographic basin in question is presented, as well as the environmental problems that characterize it, postulating the need to carry out this type of survey to define the basin as a fundamental planning unit. The Acaraú River basin has particular characteristics, since it is located in a poor and extremely populous semi-arid region, which results in socio-environmental stress, whose main consequence is the environmental degradation of the fluvial course. The regional authorities need to be aware of the geoenvironmental elements raised in order to reverse this framework of socio-environmental degradation of water resources and to allow territorial growth based on sustainable development.

Length-weight relationship of six freshwater fish species in upper-middle Tocantins River basin (Brazil)

2018 ◽  
Vol 34 (4) ◽  
pp. 1021-1024
Author(s):  
D. C. O. Rosa ◽  
R. Bartolette ◽  
B. E. Soares ◽  
M. F. G. Brito
Keyword(s):  
Freshwater Fish ◽  
River Basin ◽  
Fish Species ◽  
Freshwater Fish Species ◽  
Weight Relationship ◽  
Tocantins River ◽  
Relationship Of

A review of the freshwater fishes of the Kimberley region of Western Australia

Zootaxa ◽  
2011 ◽  
Vol 2816 (1) ◽  
pp. 1 ◽  
Author(s):  
DAVID L. MORGAN ◽  
GERALD R. ALLEN ◽  
BRADLEY J. PUSEY ◽  
DAMIEN W. BURROWS
Keyword(s):  
Freshwater Fish ◽  
River Basin ◽  
Fish Species ◽  
Western Australia ◽  
Single Species ◽  
Freshwater Fishes ◽  
Gambusia Holbrooki ◽  
Freshwater Fish Species ◽  
Introduced Fishes ◽  
Eastern Mosquitofish

This paper provides an overview of the freshwater fishes of the remote and sparsely populated Kimberley region of Western Australia, an area that has been subject to minimal scientific surveys, most of which have occurred in the last 30 years. A total of 49 freshwater fish species are reported from the region, but this number will likely grow as a result of future discoveries. It is an endemic hotspot, with ~40% of the species found nowhere else; many of which are known from only a few localities. The fauna is dominated by members of the Terapontidae (10 species) and Eleotridae (10 species), followed by the Plotosidae (five species), Melanotaeniidae (five species), Atherinidae (four species) and Ambassidae (four species). Additionally, in terms of freshwater fishes of the Kimberley, there are two species each in the Toxotidae and Ariidae, and a single species from each of the Anguillidae, Clupeidae, Hemiramphidae, Belonidae, Apogonidae, Gobiidae and Soleidae. There are currently no introduced fishes found in any major catchments of the Kimberley, however, there are records of the Eastern Mosquitofish (Gambusia holbrooki) from Cape Leveque (Morgan et al. 2004c) and the Redclaw Crayfish (Cherax quadquicarinatus), which have recently been found within the Ord River basin (Doupé et al. 2004).

scholarly journals Continental ichthyofauna from the Paraíba do Norte River basin pre-transposition of the São Francisco River, Northeastern Brazil

2018 ◽  
Vol 18 (4) ◽  
Author(s):  
Telton Pedro Anselmo Ramos ◽  
Jéssica Alcoforado de Sena Lima ◽  
Silvia Yasmin Lustosa Costa ◽  
Márcio Joaquim da Silva ◽  
Raizze da Costa Avellar ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
River Basin ◽  
Fish Species ◽  
Scientific Data ◽  
Northeastern Brazil ◽  
Fish Diversity ◽  
Freshwater Fish Species ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Number Of Publications

Abstract: Freshwater ichthyofauna from Brazil Northeast region was considered as being poorly known until recent years, with a considerable number of publications becoming available in the last decade. The present study provides an inventory of freshwater fish species from the Paraíba do Norte River basin located in Paraíba State, Brazil. This inventory is intended to contribute to the of knowledge to the regional fish diversity, pre-transposition of the São Francisco River. Collecting data was obtained from ichthyological databases of both national and foreign institutions. A total of 47 freshwater fish species are registered within the Paraíba do Norte River basin, represented by 38 genera, 20 families and six orders. Characiformes, comprising 47% (22 species), Cichliformes, and Siluriformes are among the most representative orders, 19% (9 species) each, of total recorded species. Seven species of Cichliformes are reported as introduced species in this basin. Cyprinodontiformes and Gobiiformes also registered in this region and correspond to 5% (two species) and Gymnotiformes, Perciformes and Synbranchiformes, 2% (one species each) of total recorded species. Paraíba do Norte River basin stands out in the current national scenario as it comprises the first region from the Mid-Northeastern Caatinga freshwater ecoregion to receive water from the transposition of the São Francisco River. The current inventory is important as it provides scientific data related to the ichthyofauna of Paraíba do Norte River basin prior to the commencement of the river transposition process. An identification key is also given for the freshwater fish species of the region.

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