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Registros recuperados: 7
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Change in enzymatic activity of microbial communities on the seasonal differences in soils the of biomes caatinga and atlantic forest. Repositório Alice
BONONI, L.; VASCONCELLOS, R. L. F.; TAKETANI, R. G.; VILELA, E. S. D.; MOITINHO, M. A.; MELO, I. S. de.
Abstract: The average global temperature has increased and will continue increasing, with forecast of up to 5.8° C by the end of this century as a result of the increase in the concentration of greenhouse gases in the atmosphere. Due to these increased temperature, some biomes may introduce features of arid and semi-arid environments in the coming years. The patterns of water availability in the soil can select groups of microorganisms with physiological strategies to tolerate these seasonal changes. Nutrient availability for plants becomes limited when the aqueous part of the soil is low in the dry period. On the other hand, in irrigated soils the concentration of nutrients available associated with mineralization increases rapidly. Environmental...
Tipo: Separatas Palavras-chave: Arid environments; Seasonality; Soil microbiota; Caatinga; Dry environmental conditions; Enzyme activity; Soil microorganisms.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1037853
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Density of ocelots in a semiarid environment in northeastern Brazil Biota Neotropica
Penido,Gabriel; Astete,Samuel; Furtado,Mariana Malzoni; Jácomo,Anah Tereza de Almeida; Sollmann,Rahel; Torres,Natalia; Silveira,Leandro; Marinho Filho,Jader.
Abstract Ocelots play a key role in ecological communities as mesopredators affecting the lower trophic level and other mesopredators. They show great variability in ecological traits across their distribution, but knowledge of this species is missing in several regions where it occurs. Here, we present the first study of ocelot in the Brazilian semiarid of Caatinga. Arid habitats might keep carnivore population density low and therefore vulnerable to environmental shocks and to human-induced changes, at risk of local extinction. To assess their population status, we used camera traps between September 2009 and January 2010. We estimated the density of ocelots using a spatially explicit capture-recapture method (SECR) to be 3.16 ± 0.46 individuals per 100...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Arid environments; Brazil; Density; Ocelot; SECR.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400503
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Flowering and pollination ecology of Cleistocactus baumannii (Cactaceae) in the Brazilian Chaco: pollinator dependence and floral larceny Acta Botanica
Ferreira,Bruno Henrique dos Santos; Souza,Camila Silveira; Fachardo,André Luiz Silva; Gomes,Aline Conceição; Sigrist,Maria Rosângela.
ABSTRACT Cleistocactus baumannii is the only ornithophilous cactus species in the Brazilian Chaco. In addition, this species of Cactaceae invests heavily in flowering in the ecoregion. Such characteristics motivated us to evaluate the temporal availability of flowers in the context of its floral visitors. The reproductive system of C. baumannii, the number of individuals in flowering, flower abundance and the frequency and richness of floral visitors were evaluated and quantified. Nectar robbery was a frequent phenomenon in the studied population; therefore, we compared the pollen load deposited on the stigma of damaged (robbery) and undamaged flowers. In the Brazilian Chaco, C. baumannii is self-incompatible and has a continuous flowering pattern,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arid environments; Chlorostilbon lucidus; Floral damage; Nectar robbery; Ornitophily; Xylocopa splendidula.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100167
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Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo OceanDocs
Ngaira, Josephine K..
Climate patterns of the World became very variable during the last half of the twentieth century. Causes of this variability/change have been identified as: Sun Spot activity, ozone depletion, decline in the solar beam, with the more pronounced especially in Africa being Increased atmospheric carbondioxide, and albedo change due to anthropogenic factors. The most affected weather elements by the above mentioned factors particularly in the tropics are Rainfall and Temperature, and the climatic environments most affected by the named weather elements are the arid and semi-arid lands which are already moisture constrained. The rift valley in Kenya, where most of the lakes are located experience Arid and Semi-Arid climate. The lakes located in this region are...
Tipo: Proceedings Paper Palavras-chave: Climatic changes; Resource management; Lake basins; Anthropogenic factors; Inland waters; Environmental impact; Water policy; Lake dynamics; Arid environments; Rainfall; Water resources.
Ano: 2006 URL: http://hdl.handle.net/1834/1472
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Population ecology of Eligmodontia morgani (Rodentia, Cricetidae, Sigmodontinae) in northwestern Patagonia Ecología austral
Monteverde,Martín; Piudo,Luciana; Hodara,Karina; Douglass,Richard.
Eligmodontia morgani is one of the most abundant endemic species of arid Patagonian steppe. Most previous studies have focused on systematics and taxonomy and ecological information on this species is scarce. The objectives of this study were to estimate population parameters for E. morgani in the Patagonian steppe ecoregion and to compare them to parameters available for this species in another environment. Data were collected from February 2003 through October 2004. Abundances ranged from 12±1.85 to 71±6.67, with residents comprising 39% of the population. The sex ratio was female biased and age classes resulted in juveniles body mass ≤11 g, subadults between 13-15 g, and adults ≥17g. The breeding season lasted from August to March....
Tipo: Info:eu-repo/semantics/other Palavras-chave: Patagonian steppe ecoregion; Arid environments; Silky desert mouse; Rodent ecology; Population parameters.
Ano: 2011 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2011000200007
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Recruitment patterns in four species of Physaria (Brassicaceae): implications for maintenance of population density over time in both native and cultivated stands Ecología austral
González-Paleo,Luciana; Pastor-Pastor,Alejandro; Bar Lamas,Marlene; Vilela,Alejandra; Ravetta,Damián.
Seedling recruitment is a critical stage of a plant's cycle which determines population viability, the potential for invasiveness of a plant species and the success of establishment of a crop, among other processes. We evaluated the most relevant stages leading to recruitment (seed-rain, the time of seedling emergence, and seedling survival) in four species of Physaria (P. gracilis, P. angustifolia, Physaria pinetorum and P. mendocina) in a field experiment in Patagonia, Argentina, to assess the possibility of using spontaneous recruitment to understand population dynamics and to evaluate the potential of this process as a tool for crop reestablishment. We determined the effect of water availability and initial seedling density on final stand density. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lesquerella; Arid environments; Seed-rain; Seedling survival; Seedling density; Water availability.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2016000300012
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Two new species of the ant genus Pogonomyrmex (Hymenoptera: Formicidae) from Argentina Rev. Soc. Entomol. Argent.
Cuezzo,Fabiana; Claver,Silvia.
Two new species of Pogonomyrmex Mayr from Argentina, P. mendozanus sp. nov. and P. kusnezovi sp. nov., are described. An updated list of species of Pogonomyrmex from Argentina is provided, as well as distributional data, comments on the biology of new species, and figures. A revised key of the known species for Argentina based on workers is offered.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pogonomyrmex mendozanus; Pogonomyrmex kusnezovi; Myrmicinae; Arid environments; Taxonomy; New species.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802009000100003
Registros recuperados: 7
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