scholarly journals Cryptic species diversity in the Hypsolebias magnificus complex, a clade of endangered seasonal killifishes from the São Francisco River basin, Brazilian Caatinga (Cyprinodontiformes, Aplocheilidae)

ZooKeys ◽  
2018 ◽  
Vol 777 ◽  
pp. 141-158 ◽  
Author(s):  
Wilson J. E. M. Costa ◽  
Pedro F. Amorim ◽  
José Leonardo O. Mattos
Keyword(s):  
Cryptic Species ◽  
Environmental Changes ◽  
Molecular Data ◽  
Northeastern Brazil ◽  
Nominal Species ◽  
Test Species ◽  
Small Areas ◽  
Sao Francisco River ◽  
River Floodplains ◽  
São Francisco River

A great diversity of animal species adapted to life in the semi-arid Caatinga of northeastern Brazil, including seasonal killifishes, has been reported in the last three decades. More recently, field and molecular data have shown a high occurrence of cryptic species. The killifish group herein analysed, the Hypsolebiasmagnificus species complex, is endemic to the middle and southern portion of the Caatinga, occupying about 120 km along the floodplains of the middle São Francisco River and some adjacent tributaries. Species of this complex are rare and presently considered threatened with extinction, being uniquely found in pools protected by trees and bushes. Single-locus delimitation methods were used to test species limits of populations displaying different colour patterns along the whole distribution of the complex. All analyses consistently supported the three nominal species and two new, herein described: H.gardneri Costa, sp. n., from the floodplains of the middle São Francisco River and H.hamadryades Costa, sp. n., from the Gorotuba River floodplains. The phylogenetic analysis highly supports H.hamadryades as sister to a clade comprising H.gardneri and H.harmonicus. Our field observations suggest that H.hamadryades is a miniature species. This study indicates that the H.magnificus complex comprises cryptic species apparently endemic to small areas and extremely vulnerable to environmental changes, deserving high concern.

scholarly journals MUDANÇAS AMBIENTAIS QUATERNÁRIAS NA PORÇÃO SUBMÉDIA DA PLANÍCIE DO SÃO FRANCISCO: RECONSTRUÇÃO AMBIENTAL

2017 ◽  
Vol 32 (3) ◽  
pp. 107
Author(s):  
Daniel Rodrigues de Lira
Keyword(s):  
General Circulation ◽  
Environmental Changes ◽  
Time Frame ◽  
Atmospheric Teleconnection ◽  
Sao Francisco River ◽  
River Floodplains ◽  
São Francisco River ◽  
Floodplain Deposits ◽  
The Last Glacial

A dinâmica dos acontecimentos geomorfológicos e sua evolução tornam-se necessárias para elucidar a história recente da paisagem. Nessa perspectiva a análise de depósitos superficiais permitiu a reconstrução das dinâmicas ambientais para a região com ênfase temporal/paleoambiental. Os Latossolos que integram a Planície do Rio São Francisco têm origem a partir do rebaixamento de suas águas e surgimento de barras arenosas retrabalhadas pelo vento em períodos de maior semiaridez formando campos de dunas; em períodos mais úmidos, mantos de areia, sendo estes retrabalhados em momentos de cheias, originando depósitos arenosos na planície fluvial. Os estudos indicam uma gênese climática controlada por fatores da circulação geral da atmosfera em nível global e regional, revelando tele conexões importantes desde o Último Máximo Glacial – UMG, transição Pleistoceno/Holoceno até o Holoceno Superior. QUATERNARY ENVIRONMENTAL CHANGES IN THE SUBMIDDLE REACH OF SÃO FRANCISCO RIVER FLOODPLAINS: AN ENVIRONMENTAL RECONSTRUCTION ABSTRACTThe analysis of superficial deposits allows the reconstruction the environmental dynamics of the study area within a given palaeo-environmental time frame. The Oxisols developed on the Sao Francisco floodplain deposits, originate from the lowering of water-table levels in the river banks and the subsequent emergence of sandy bars, some of which were reworked by wind erosion during periods of stronger semi-aridity, resulting in the accumulation of dune fields and sand mantles in wetter periods. Later on, some of these deposits were reworked by the floods of the São Francisco River. The results of this research point to a climatic genesis of landforms, driven by general circulation controls, thus revealing the role of important atmospheric teleconnection events in the area occurring since the Last Glacial Maximum – LGM, through the Pleistocene/Holocene transition until the Upper Holocene.Keywords: evolution of the landscape; superficial deposits; semiarid.

scholarly journals Split distribution, biogeography and morphological and genetic diversity of the Iberobathynellini Tribe in the family Parabathynellidae (Crustacea, Malacostraca, Bathynellacea)

2022 ◽  
pp. 1-61
Author(s):  
Ana Isabel Camacho ◽  
Paloma Mas-Peinado ◽  
E. Karen López-Estrada ◽  
Beatriz A. Dorda ◽  
Isabel Rey
Keyword(s):  
North America ◽  
Cryptic Species ◽  
Plate Tectonics ◽  
Taxonomic Status ◽  
Molecular Data ◽  
Molecular Dating ◽  
Nominal Species ◽  
The Family ◽  
Well Differentiated ◽  
Morphological And Molecular Data

Abstract The “Iberobathynella group”, or Iberobathynellini tribe, is a complex of six genera consisting of 33 nominal species and several cryptic species with an amphiatlantic distribution (in Europe, North Africa and North America). A modern systematic revision of this group of subterranean crustaceans is presented here. A phylogenetic and biogeographic study using morphological and molecular data (mitocondrial coi and nuclear 18S) was carried out and allowed to a) re-evaluate the taxonomic status and validity of previously erected subtribes, genera and subgenera that show congruence in the data; b) assess whether the identified mitochondrial lineages represent cryptic species; c) provide a plausible phylogenetic hypothesis for the relationships within Iberobathynellini and with the other two genera of the family Parabathynellidae that inhabit North America and Europe (Montanabathynella and Parabathynella, respectively); d) propose a plausible temporal and historical framework (paleobiogeographic scenario) for the diversification and evolution of the Iberobathynellini tribe based on the current distribution of morphotypes and their estimated times of divergence. Our results show that in parabathynellids, molecular and morphological divergences are not always congruent. Subtribe and subgenus are invalid categories so they must be eliminated. Paraiberobathynella genus needs to be revisited. The molecular dating results support the early divergence of the Iberobathynellini Tribe (Upper Cretaceous, around 78 Mya) and the vicariance by plate tectonics as main factor to explain the amphi-Atlantic distribution shown by this ancient subterranean crustacean group. Since there are species morphologically very similar to I. magna and I. imuniensis, but genetically different, we can ensure the existence of at least three cryptic species. Texanobathynella is undoubtedly a valid genus distinct from Iberobathynella. Montanabathynella and Parabathynella are two well-differentiated genera closely related to the Iberobathynellini tribe.

scholarly journals New record of Heraclides a. astyalus (Godart) (Lepidoptera: Papilioninae: Papilionini) on the northern São Francisco river, Brazil

Check List ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 927 ◽  
Author(s):  
Carlos Eduardo Beserra Nobre ◽  
Clemens Schlindwein
Keyword(s):  
Arid Region ◽  
New Record ◽  
National Park ◽  
First Record ◽  
Northeastern Brazil ◽  
Single Male ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Semi Arid Region ◽  
Semi Arid

A single male of Heraclides a. astyalus was collected in the Catimbau National Park, Buíque, Pernambuco, located in the semi-arid region of northeastern Brazil. It is the first record for the species in the Caatinga domain and the first record for the subspecies in latitudes above the São Francisco river.

scholarly journals Biodiversity assessment of benthic macroinvertebrates along a reservoir cascade in the lower São Francisco river (northeastern Brazil)

2005 ◽  
Vol 65 (2) ◽  
pp. 229-240 ◽  
Author(s):  
M. Callisto ◽  
M. Goulart ◽  
F. A. R. Barbosa ◽  
O. Rocha
Keyword(s):  
Northeastern Brazil ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Negative Consequences ◽  
Cascade System ◽  
System Effect ◽  
Rainy Period ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Significant Difference

In order to verify the cascade-system effect in benthic macroinvertebrate communities, and the implications for policy making and proposals for conservation and sustainable use of the lower portion of São Francisco river basin (Bahia State, Brazil), a three-reservoir cascade system including two stretches downstream were studied during dry (June, 1997) and rainy (March, 1998) periods. The dominant groups found were Mollusca (Melanoides tuberculata), Oligochaeta, and Chironomidae larvae. Low Shannon-Wiener and Pielou index values were found, but with no significant difference between the sampling periods. However, density and taxonomic richness were significantly different (t(0.05; 31) = -2.1945; p < 0.05; e t(0.05; 31) = -3.0600; p < 0.01) between the sampling periods, with a reduction in the number of taxaand macroinvertebrate abundance during the rainy period. An increasing gradient in benthic macroinvertebrate community structures was noted along the reservoir cascade from the first reservoir (Apolônio Sales), followed by a decrease downstream from the third reservoir of the system (Xingó). Despite the negative consequences of rapid proliferation of dams, which have caused widespread loss of freshwater habitats, the reservoir cascade system promoted an increase in benthic macroinvertebrate diversity, due to water-quality improvement along the system.

scholarly journals Limnoperna fortunei (Dunker, 1857) (Mollusca, Bivalvia, Mytilidae): first record in the São Francisco River basin, Brazil

Check List ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 1846 ◽  
Author(s):  
Newton P. U. Barbosa ◽  
Fabiano A. Silva ◽  
Márcia Divina De Oliveira ◽  
Miguel Arcanjo dos Santos Neto ◽  
Marcela David De Carvalho ◽  
...  
Keyword(s):  
River Basin ◽  
First Record ◽  
Northeastern Brazil ◽  
Limnoperna Fortunei ◽  
Sao Francisco River ◽  
Central Brazil ◽  
São Francisco River ◽  
The Government ◽  
First Time ◽  
Uruguay River

Limnoperna fortunei (Dunker, 1857) is a small mytilid native to Southeast Asia. It was introduced in South America in early 1990 and has dispersed from Argentina to central Brazil, and until 2014 has been restricted mainly to the Paraná and Uruguay river basins. The present note reports the occurrence of Limnoperna fortunei for the first time in the São Francisco River basin in northeastern Brazil. The establishment of L. fortunei in these regions will require close attention from the government and also by society.

scholarly journals Amphibia, Anura, Microhylidae, Stereocyclops incrassatus Cope, 1870: distribution extension

Check List ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 071 ◽  
Author(s):  
Geraldo J. B. Moura ◽  
Edson V. E. Andrade ◽  
Eliza M. X. Freire
Keyword(s):  
Minas Gerais ◽  
Northeastern Brazil ◽  
Atlantic Rainforest ◽  
Eastern Coast ◽  
Espírito Santo ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Espirito Santo

The microhylid frog Stereocyclops incrassatus occurs in humid forests of the eastern coast of Brazil south of the São Francisco River, in the states of Minas Gerais, Espírito Santo and Bahia. The present work reports this species in three Atlantic Rainforest fragments located in states of Alagoas and Pernambuco, northeastern Brazil, thus expanding the known distribution of Stereocyclops incrassatus ca. 1000 km northwards.

Establishment of the non-native fish Metynnis lippincottianus (Cope 1870) (Characiformes: Serrasalmidae) in lower São Francisco River, northeastern Brazil

2017 ◽  
Vol 52 (3) ◽  
pp. 228-238 ◽  
Author(s):  
Daniel Alvares Silveira de Assis ◽  
Vinícius Augusto Dias-Filho ◽  
André Lincoln Barroso Magalhães ◽  
Marcelo Fulgêncio Guedes Brito
Keyword(s):  
Northeastern Brazil ◽  
Native Fish ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Meteorological and hydrological variables on occurrence of riverbank erosion along lower São Francisco river

2013 ◽  
Vol 17 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Igor P. da Rocha ◽  
Francisco S. R. Holanda ◽  
Renisson N. Araújo Filho ◽  
Ana P. B. Casado ◽  
Arilmara A. Bandeira
Keyword(s):  
Northeastern Brazil ◽  
Rainfall Regime ◽  
Historical Records ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Climatological Station ◽  
Irrigated Perimeter ◽  
The Right ◽  
Predominant Direction ◽  
Hydrological Variables

The objectives of this paper were to analyze the seasonal distributions of climatic and hydrological variables along the Lower São Francisco River, Northeastern Brazil, between the States of Sergipe and Alagoas, and further, to verify their relationships with the erosion of the right margin in Sergipe State. The investigated area comprises the sedimentary portions of the Lower São Francisco River, located at the Cotinguiba-Pindoba Irrigated Perimeter. Historical records of variables such as rainfall, river streamflow velocity, river discharge, wind velocity and the predominant direction were collected from a climatological station as well as rain and streamflow gauges located in the municipality of Propriá. The rainfall that occurs in the region is considered non-erosive, 96.2% of the rain had intensity less than 25.0 mm h-1. The evolution of erosion is explained by the increase in the outflow in February that peaked at 9,894.50 m³ s-1 and led to increases in the flow velocity. The rainfall regime interacts with the wind that blows predominantly from the eastern direction during the dry season and from the southeastern direction during the rainy season with maximum velocities of 5.5 and 8.0 m s-1, respectively.

scholarly journals Creating the Path for Sustainability: Inserting Solar PV in São Francisco Transposition Project

2020 ◽  
Vol 12 (21) ◽  
pp. 8982
Author(s):  
Jean Carlos da Silva Galdino ◽  
Marcos Aurélio Vasconcelos Freitas ◽  
Neilton Fidelis da Silva ◽  
Marcio Giannini Pereira ◽  
João Marcelo Dias Ferreira
Keyword(s):  
Electric Energy ◽  
Electrical Energy ◽  
Northeastern Brazil ◽  
Annual Rainfall ◽  
Solar Pv ◽  
Sao Francisco River ◽  
São Francisco River ◽  
City Water ◽  
The One ◽  
Installed Capacity

Semiarid regions are characterized by prolonged droughts and drought regimes. In Brazil, 57% of the northeast region is considered semiarid, with an average annual rainfall of less than 800 mm. This climatic condition imposes the need to conduct public policies and develop infrastructure in order to mitigate drought effects. In this context, the São Francisco River transposition project is an alternative to problems concerning city water supplying and aiming at decreasing socio-economic impacts resulting from water restrictions in this region. On the one hand, the river transposition has the potential to establish a new development cycle in Northeastern Brazil, while, on the other, electricity demands, estimated at 2533 GWh/year from 320 MW of installed capacity, require technological alternatives that ensure the project’s financial sustainability. In this context, this study presents proposals for arrangements concerning electric energy production through photovoltaic systems as an alternative supply for the transposition project. To this end, a study of the region’s photovoltaic solar potential was carried out. Based on the performed assessment, three production arrangement proposals that consider the use of (i) the lateral area and (ii) the transposition channel and (iii) part of the area of some reservoirs belonging to the transposition of São Francisco river. The study point out that the use of this potential for all three studied arrangements is favorable to supply, individually or in a combined form, the electrical energy demanded by the pumping stations installed.

Sign in / Sign up

Export Citation Format

Share Document