scholarly journals ECOLOGIA DE PEIXES DE RIACHOS INTERMITENTES

2021 ◽  
Vol 25 (02) ◽  
pp. 605-619
Author(s):  
Bianca de Freitas Terra ◽  
◽  
Elvio Sergio Figueredo Medeiros ◽  
Jorge Iván Sánchez Botero ◽  
José Luis Costa Novaes ◽  
...  
Keyword(s):  
Arid Region ◽  
Riparian Vegetation ◽  
Hydrological Cycle ◽  
Future Research ◽  
Intermittent Streams ◽  
Species Introduction ◽  
The Past ◽  
Semi Arid Region ◽  
Semi Arid

The ecology of fish from intermittent streams in the Brazilian semi-arid region is still little known. In the past twenty years, the number of researchers dedicated to this topic has increased considerably. However, significant gaps still exist when compared to the perennial streams of other regions of Brazil. Questions that address seasonal variations come up against the determination of capture methods and techniques that are efficient in the different phases of the hydrological cycle. In addition, techniques widely used in perennial systems, such as electrofishing, in most cases, have not been effective. Aspects related to biology, physiology, behavior, functional and taxonomic ecology of fish still need to be investigated taking into account seasonal and spatial scale variations. In view of the growing transformation imposed on the Brazilian semi-arid region by the extensive use of natural resources and by climate change, aquatic environments and their biodiversity are threatened by the transformation of riparian vegetation, the sewage release, the species introduction, the modification of its course and artificial perennialization. Thus, we will present and discuss, in this paper, the studies developed on the ecology of fish in the intermittent streams of the Brazilian semi-arid region and the gaps and challenges to be faced by future research.

scholarly journals Aquatic systems in semi-arid Brazil: limnology and management

2012 ◽  
Vol 24 (1) ◽  
pp. 103-118 ◽  
Author(s):  
José Etham de Lucena Barbosa ◽  
Elvio Sérgio Figueredo Medeiros ◽  
Jandeson Brasil ◽  
Raquel da Silva Cordeiro ◽  
Maria Cristina Basilio Crispim ◽  
...  
Keyword(s):  
Arid Region ◽  
Aquatic Systems ◽  
Future Research ◽  
Catchment Scale ◽  
Water Shortages ◽  
Holistic Model ◽  
Biological Communities ◽  
Lakes And Reservoirs ◽  
Semi Arid Region ◽  
Semi Arid

Aquatic systems in semi-arid Brazil include natural shallow lakes, artificial reservoirs and intermittent streams and rivers. These systems are distinctive features in the semi-arid landscape and comprise a range of associated systems functioning as an ever-changing mosaic of dry/wet patches. Lakes and reservoirs in semi-arid Brazil are subject to important periods of water shortages, whereas rivers and streams are characterized as highly variable and driven by the extremes of water flow and its absence. Within this view a catchment-scale approach must be used to create a holistic model to conceptualize and comprehend these aquatic systems, since the aquatic environment types in the semi-arid region of Brazil incorporate broader aspects within the catchment scale such as geomorphology, vegetation, climate and land use. This paper summarizes some of the information on the aquatic systems of the Brazilian semi-arid region and shows the importance of limnological studies in this region. It also attempts to establish perspectives for future research considering the catchment as a scale for surveying biological processes and limnological characteristics of the various aquatic systems. It is presented information on their overall structure and functioning, as well as characteristics of some biological communities, such as phytoplankton, periphyton, aquatic macrophytes, benthic invertebrates and fish. The importance of the understanding of eutrophication in reservoirs and the role of the dry phase in streams is emphasized, and information on possible actions of planning and management to improve water quality of reservoirs are presented.

Determination of crop evapotranspiration of table grapes in a semi-arid region of Northwest Mexico using multi-spectral vegetation index

2013 ◽  
Vol 122 ◽  
pp. 12-19 ◽  
Author(s):  
S. Er-Raki ◽  
J.C. Rodriguez ◽  
J. Garatuza-Payan ◽  
C.J. Watts ◽  
A. Chehbouni
Keyword(s):  
Arid Region ◽  
Vegetation Index ◽  
Crop Evapotranspiration ◽  
Table Grapes ◽  
Northwest Mexico ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Usefulness of class A Pan coefficient models for computation of reference evapotranspiration for a semi-arid region

MAUSAM ◽  
2021 ◽  
Vol 65 (4) ◽  
pp. 521-528
Author(s):  
PK SINGH ◽  
SK PATEL ◽  
P JAYSWAL ◽  
SS CHINCHORKAR
Keyword(s):  
Arid Region ◽  
Reference Evapotranspiration ◽  
Accurate Determination ◽  
Climatic Conditions ◽  
Gujarat State ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Statistical Criteria ◽  
Agricultural Organization

The reliability of estimates of reference evapotranspiration (ET0) using pan evaporation (Epan) depends on the accurate determination of pan coefficients (Kpan). Six ET0 models were evaluated for their usefulness using 33-year climatological dataset of a semi-arid region of the Gujarat state of India. The equations compared include Cuenca (1989), Allen and Pruitt (1991), Snyder (1992), Modified Snyder (Grismer et al., 2002), Orang (1998), and Pereira et al. (1995). The ET0 data, calculated using daily Kpan values from these equations, were compared to the Food and Agricultural Organization (FAO)-Penman-Monteith (FAO56-PM) method as a reference. Based on the visual comparison as well as from the statistical criteria, ET0 values computed using Modified Snyder and Orang model have very close agreement with the FAO56-PM method for daily, monthly, and annual estimates as compared to other approaches. The sequential performances of the explored models was found as: Modified Snyder (Eqn. 5) > Orang (Eqn. 6) > Cuenca Eqn. (2) > Allen & Pruitt (Eqn. 3) > Snyder (Eqn. 4) > Pereira et al. (Eqn. 7) model. Therefore, the Modified Snyder model (Grismer et al., 2002) could be recommended as the best model for ET0 computations under these prevailing climatic conditions for a semi arid region.

scholarly journals APLICAÇÃO DE UM PROTOCOLO DE AVALIAÇÃO AMBIENTAL RÁPIDA EM DOIS RESERVATÓRIOS DO SEMIÁRIDO BRASILEIRO

2016 ◽  
Vol 20 (1) ◽  
Author(s):  
MAIARA TÁBATHA DA SILVA BRITO ◽  
SILVANO LIMA DO NASCIMENTO FILHO ◽  
GIRLENE FÁBIA SEGUNDO VIANA ◽  
MAURO MELO JÚNIOR
Keyword(s):  
Arid Region ◽  
Riparian Vegetation ◽  
Environmental Changes ◽  
Rapid Assessment ◽  
Water Volume ◽  
Monitoring Tool ◽  
Assessment Protocol ◽  
Semi Arid Region ◽  
Artificial Reservoirs ◽  
Semi Arid

In the semi-arid region of Brazil, artificial reservoirs are ecosystems of extremely important ecological and social. Due to pressures caused by long periods of pluviometric irregularity, the reservoirs Cachoeira I and Barra, located in the interior of Pernambuco, have been subject to very significant changes, marked mainly by the reduction of stored water volume, seasonal changes in the abiotic parameters, reduction of riparian vegetation and absence of macrophytes. All these changes were observed in this study through the use of an auxiliary monitoring tool, a rapid assessment protocol adapted for lentic ecosystems of semiarid, capable of detecting numerous types of environmental changes, assisting in monitoring these springs.

scholarly journals A relação entre litogia e morfologia das encostas das montanhas Tucson, Arizona

2008 ◽  
Vol 31 (1) ◽  
pp. 30-42
Author(s):  
Kamel Khanchoul ◽  
Robert Altschul
Keyword(s):  
Arid Region ◽  
Structural Characteristics ◽  
Size Analysis ◽  
Slope Length ◽  
Mountain Front ◽  
Semi Arid Region ◽  
The Relationship ◽  
Semi Arid

The relationship between lithology and slope morphology is investigated at eight sites on granitic, andesitic, and sedimentary hillslopes in the Tucson Mountains, Arizona. Several methods are used in the study. Topographic profiles are constructed. Skewness indices, slope length, and mean slope angles of the different slope profiles are computed and compared with each other. Debris size analysis has permitted for some profiles, the determination of hillfront/piedmont junctions. The nature and structural characteristics of the bedrock are the ones that determine the hillslope morphology in this semi-arid region. There are, as a matter of fact, variations in profiles on the same bedrock nature but differently exposed. More precise morphologic studies have been also done in comparing the different lithologic pairs. They have permitted to show some similarities in shapes. The granitic-andesitic slopes and andesiic-sedimentary slopes are the best comparisons which show the relationship between lithology and slope morphology. The granitic-sedimentary slope relationship is shown in the hillfront concavities, mountain front and piedmont mean slope angles.

scholarly journals Determination of Soil Organic Carbon Variability of Rainfed Crop Land in Semi-arid Region (Neural Network Approach)

2010 ◽  
Vol 4 (7) ◽  
Author(s):  
Yahya Parvizi ◽  
Manochehr Gorji ◽  
Mahmoud Omid ◽  
Mohammad Hossain Mahdian ◽  
Manochehr Amini
Keyword(s):  
Neural Network ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Arid Region ◽  
Network Approach ◽  
Neural Network Approach ◽  
Crop Land ◽  
Semi Arid Region ◽  
Semi Arid
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