Consulta: subjectFacets:"Rainy season"
Registros recuperados: 9
Data/hora: 10/06/2024 09:14:37

Spatial patterns of zooplanktivore Chirostoma species (Atherinopsidae) during water-level fluctuation in the shallow tropical Lake Chapala, Mexico: seasonal and interannual analysis
Provedor de dados: 83
Autores: Moncayo-Estrada,Rodrigo; Escalera-Gallardo,Carlos; Lind,Owen T.
This study addresses the influence of water-level fluctuations on fish distribution at two temporal scales: seasonal (dry and rainy) and interannual (low and high volume conditions). The analysis of abundance relationships among three zooplanktivore Chirostoma species at fifteen sites in Lake Chapala, Mexico, revealed the significant influence of contrasting conditions (P=0.0002). Seasonally, segregation was more related to species dominance in the dry season and exclusively related to environmental characteristics in the rainy season. Interanually, biotic influence occurred in the shallowest and the deepest episodes of the lake. Environmental characteristics influenced species distribution when the lake reached 25% of its volume. Site, depth, temperature,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry season; Rainy season; Silversides; Temporal scale; Volume change.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400012

Fish population responses to hydrological variation in a seasonal wetland in southeast México
Provedor de dados: 83
Autores: Escalera-Vázquez,Luis H.; Calderón-Cortés,Nancy; Zambrano-González,Luis.
ABSTRACT Hydrological variation differently affects fish species. In the present study, the response of local populations of 13 fish local species to hydrological variation in a tropical wetland was evaluated. The objectives were to analyze the abundance response of fish species with distinct life history strategies and to assess the role of hydrological variation on fish population patterns. We found that opportunistic strategists were favored by high hydrological variation in drought periods, the equilibrium strategists were related to stable habitats, and periodic strategists were regulated by floods and temperature. However, the life history strategies identified for some species in this study do not correspond to the classification reported in other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry season; Fish resilience; Life history strategies; Rainy season; Sian Ka´an.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200207

Inicio, duración y término de la estación lluviosa en cinco localidades de la costa ecuatoriana
Provedor de dados: 20
Autores: Zambrano, E.; Hernández, F.
El objetivo de este trabajo es llegar a definir el inicio, término y duración de la estación lluviosa, mediante el análisis de datos de precipitación a fin de usar los resultados como fechas atribuibles a los cambios de estación climática presentes en la costa ecuatoriana.
Tipo: Journal Contribution
Palavras-chave: Atmospheric precipitations; Rainy season; Daily; Variability; El Nino phenomena; Climatology; Climatic changes; Rainy season; Climatology.
Ano: 2007
URL: http://hdl.handle.net/1834/2507

Distribución estacional y ecología de las medusas (Cnidarias: Hydrozoa) en la zona costera sur de la Bahía de Santa Elena durante el período (Octubre 2004-octubre 2005)
Provedor de dados: 20
Autores: Andrade Ruíz, C.E.
La presente investigación se desarrolló en el sector sur de la Bahía de Santa Elena durante octubre 2004 a octubre 2005, analizándose un total de 144 muestras zooplanctónicas e identificándose 24 especies, clasificados en 6 órdenes: 5 de la clase Hydrozoa, con 16 familias; 22 géneros y 22 especies, y 2 clases: La clase Scyphozoa y Cubozoa con 1 especie respectivamente. Se consideró las dos épocas estacionales (lluviosa y seca) registrándose para la época lluviosa el 41% de biomasa total con 6477 ind. (100m3-1), mientras que en la época seca se registró el 59% de biomasa total con 9159 ind. ((100m3-1). El análisis estadístico determinó cambios entre la estación lluviosa con una correlación positiva promedio vs la temperatura con valores de 0.75. Mientras en...
Tipo: Journal Contribution
Palavras-chave: Seasonal distribution; Biomass; Dry season; Rainy season; Species diversity; Zooplankton; Hydrobiology.
Ano: 2012
URL: http://hdl.handle.net/1834/4710

Variación estacional de las especies del microbentos de la Bahía Manta en la costa ecuatoriana, durante 2011
Provedor de dados: 20
Autores: Gualancañay, E.
Durante la estación lluviosa (marzo 2011), las especies identificadas de la microfauna bentónica en el área de la bahía de Manta son: Bulimina pulchella, Buliminella elegantissima, Cibicides bertheloti, F. boueana, Nonion pizarrense, Quinqueloculina lamarckiana, Rotalia beccarii, Lagena striata y la única especie de la microflora béntica fue Coscinodiscus perforatus y corresponden a la provincia zoogeográfica panameña propuesta por Boltovskoy (1965) y confirmada por Boltosvskoy y Gualancañay (1975) y Gualancañay (1986). Durante la fase seca (septiembre 2011), la microflora béntica estuvo representada por dos especies de diatomeas bénticas: Cocinodiscus perforatus y Polymixus coronalis. En cambio la microfauna bentónica se la halló distribuida en el área de...
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Microorganisms; Benthos; Diatoms; Biogeography; Rainy season; Dry season.
Ano: 2012
URL: http://hdl.handle.net/1834/4708

BANK OF WEED SEEDS IN AGROSYSTEMS IN THE BRAZILIAN CERRADO
Provedor de dados: 87
Autores: CARDOSO,I.S.; SOARES,M.P.; ARAÚJO,V.T.; CABRAL,P.H.R.; JAKELAITIS,A.; MADALÃO,J.C.
ABSTRACT The seed bank is the reserve of viable seeds found in the soil and is related to diversity and abundance of species that make up the weed populations. This study aimed to determine the seed bank in four distinct environments (grazing area, area of vegetables, annual crop area and perennial crop area) in two seasons (rainy and dry season). To determine the seed bank, each environment was divided into four sub-areas of 0.2 hectares, considering that each area was a repetition, totaling 16 experimental units. Samples of 0.8 kg were taken from each area, and each sample was distributed on a plastic tray and allowed to germinate in a greenhouse. The density of the individuals was determined by observing the number of emerging seedlings in the trays,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rainy season; Dry season; Shannon index; Relative importance; Diversity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300443

Soil CO2 Efflux Measurements by Alkali Absorption and Infrared Gas Analyzer in the Brazilian Semiarid Region
Provedor de dados: 90
Autores: Ferreira,Carlas Renata Prissila Costa; Antonino,Antonio Celso Dantas; Sampaio,Everardo Valadares de Sá Barreto; Correia,Karina Guedes; Lima,José Romualdo de Sousa; Soares,Willames de Albuquerque; Menezes,Rômulo Simões Cezar.
ABSTRACT The CO2 emission from the soil surface, commonly referred to as soil CO2 efflux (ECO2) or soil respiration, is the sum of processes that include root respiration and microbial activity. Measuring this evolution is important to establish sustainable land use models and to estimate global fluxes of carbon, which affect climate change. Despite its importance, few measurements have been made in areas of the semiarid Brazilian Northeast region, and most of them were made using the alkali absorption method (AA), which can underestimate ECO2. Measurements using AA were compared to measurements using the infrared gas analyzer method (IRGA) over ten months (in rainy and dry seasons), during the day and night, in areas of Caatinga (xeric shrubland and thorn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2 emission; Rainy season; Dry season; Caatinga; Pasture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100400

Performance of Nellore young bulls on Marandu grass pasture with protein supplementation
Provedor de dados: 96
Autores: Moretti,Matheus Henrique; Resende,Flávio Dutra de; Siqueira,Gustavo Rezende; Roth,Anna Paula de Toledo Piza; Custódio,Letícia; Roth,Marcella de Toledo Piza; Campos,Wellington da Costa de; Ferreira,Luiz Henrique.
The objective of this study was to verify the effect of low-intake supplementation on performance of Nellore young bulls kept on Marandu grass pasture. The experiment was divided in two periods: the dry and rainy seasons. Treatments during the dry period were composed of mineral salt with urea and mineral supplement enriched with true protein and additive. In the rainy period treatments were mineral salt and enriched mineral supplement only. Pastures were evaluated and animals were weighed in both evaluation phases. The variables studied were evaluated in a completely randomized design in a split-plot arrangement, where plots were treatments and subplots were the periods within each phase, considering the types of supplementation as treatments. During the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additive; Animal performance; Dry season; Rainy season; Supplement.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000600008

การศึกษาความแปรปรวนของช่วงฤดูฝนในภาคตะวันออกเฉียงเหนือ
Provedor de dados: 106
Autores: Suppachai Atichart; Naruatai Worasatit; Rapeeporn Srisathit; Kuson Thomma.
Uncertainty of the beginning and the end of rainy season which is a result of climate changes from global warming can have a great impact on plant production. This is particularly clear in the Northeast which is mainly rain-fed agriculture. The Office of Agricultural Research and Development Region 3, therefore, studied variation of the beginning and the end of rainy season of the Northeast using rainfall data from Meteorological Station from the year 1981 - 2010, 30 years in total. The data was imported and analyzed using MS Access 2000 and compared to the five-year assessment of spatial data. The analysis of variance was analyzed based on the standard deviation of around 30 years period and spatial mapping was conducted in ArcGIS V9.3. The results showed...
Tipo: PhysicalObject
Palavras-chave: Rainy season; Climate change; Variability characteristics; Variation; Geographic information systems; GIS; Mapping; Cropping system; ฤดูกาล; ฤดูฝน; การเปลี่ยนแปลงสภาพภูมิอากาศ; ลักษณะความแปรปรวน; ระบบสารสนเทศภูมิศาสตร์; การทำแผนที่; ปริมาณน้ำฝน; รูปแบบการปลูกพืช.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5782