Grassland
Mostrando 37-48 de 212 artigos, teses e dissertações.
-
37. Temporal profiles of vegetation indices for characterizing grazing intensity on natural grasslands in Pampa biome
ABSTRACT The Pampa biome is an important ecosystem in Brazil that is highly relevant to livestock production. The objective of this study was to analyze the potential use of vegetation indices to discriminate grazing intensities on natural grasslands in the Pampa biome. Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation In
Sci. agric. (Piracicaba, Braz.). Publicado em: 2016-08
-
38. Effect of calcium salts of fatty acids on the nutritive value of diets, feeding behavior, and serum blood parameters of lactating Saanen goats grazing on stargrass
ABSTRACT The objective of this study was to determine effects of the addition of calcium salts of fatty acids (CSFA) to the concentrate on the intake and digestibility of dry matter and nutrients and the grazing behavior of lactating Saanen goats. Five multiparous goats in their third lactation and four primiparous goats were used. The animals were distribut
R. Bras. Zootec.. Publicado em: 2016-08
-
39. Spider species composition in the tree-shrub strata of riparian forests and its microhabitats in southern Brazil
ABSTRACT The composition of the spider fauna of riparian forests is insufficiently known. These forests, adjacent to both aquatic and terrestrial environments, are recognised as having important ecosystem functions. We compare the composition of spider assemblages of four riparian forests in different drainage basins, along with their microhabitats (edges an
Zoologia (Curitiba). Publicado em: 14/07/2016
-
40. Pollen and spores from surface samples in the campos region of Uruguay and their paleoecological implications
ABSTRACT In this study we describe and illustrate pollen and spores that have been identified as significant in modern and fossil samples from the campos region of Uruguay. We provide new information about modern pollen assemblages and their relationship to the vegetation types of this region. We discuss the taxonomic limitations of pollen and spores and the
Acta Bot. Bras.. Publicado em: 04/07/2016
-
41. Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations
ABSTRACT The investigation of the phylogeny of a group of organisms has the potential to identify ecological and evolutionary processes that have been occurring within a community. Seed dispersal is a key process in the life cycle of vegetation and reflects different reproductive strategies of plants to a set of ecological and evolutionary factors. Knowing t
Acta Bot. Bras.. Publicado em: 03/05/2016
-
42. Distribution patterns of ferns and lycophytes in the Coastal Region of the state of Rio Grande do Sul, Brazil
ABSTRACT A survey of ferns and lycophytes of the Coastal Region of the state of Rio Grande do Sul (CRRS) was performed based on field work and collections of the main regional herbaria. The following were evaluated for each species: preferential habits (terrestrial, epiphytic or aquatic), geographic distribution patterns and habitats (forest, grassland, and
Acta Bot. Bras.. Publicado em: 19/04/2016
-
43. To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands
Fire plays an important role in several grassland ecosystems in the world. Fire can trigger germination in several species, by breaking the physical dormancy of their seeds. Thus, we hypothesized that exposure to high temperatures during fire would break seed dormancy and enhance germination. We tested the effect of high temperatures on the germination of si
Acta Bot. Bras.. Publicado em: 2016-03
-
44. The seed bank of subtropical grasslands with contrasting land-use history in southern Brazil
The expansion of land use for agriculture is among the main reasons for the reduction of natural grasslands around the world, and little is known about the recovery potential of original native grassland vegetation from seed banks. The aim of this study was to assess the seed bank potential of grassland areas with or without history of cultivation in souther
Acta Bot. Bras.. Publicado em: 2015-12
-
45. CORRELACIÓN ESPACIAL ENTRE MALAS HIERBAS EN UNA PRADERA Y SU RELACIÓN CON LA CONDUCTIVIDAD ELÉCTRICA APARENTE DEL SUELO (CE A )
ABSTRACT The objective of this study was to evaluate the ecology and, linear and spatial correlation between weeds in and soil apparent electrical conductivity (ECa, mS m-1) in a grassland. Measurements were done in 23/06/2008 (ECa) and 24/06/2008 (weeds). Data were analyzed using classical statistical and geostatistical tools. Most data presented logarithmi
Planta daninha. Publicado em: 2015-12
-
46. Bee assemblage in habitats associated with Brassica napus L.
ABSTRACTAssessments in agricultural crops indicate that alterations in the landscape adjacent to the crops can result in reduced productivity due to loss or low abundance of pollinating agents. In the canola crop, production is partially dependent on insect pollination. Therefore, knowledge of the faunal diversity within and near crop fields is key for the m
Rev. Bras. entomol.. Publicado em: 2015-09
-
47. Seed longevity of Eragrostis plana Nees buried in natural grassland soil
The objective of this research was to evaluate the seed longevity of Eragrostis plana Nees buried at different soil depths, in a natural-grassland area in the Pampa biome (46 m altitude, 30º05´S and 51º40´W) of Rio Grande do Sul State, Brazil. The experimental design was a split-plot type in complete blocks with two factors: seeds buried at five differen
R. Bras. Zootec.. Publicado em: 2014-11
-
48. Una nueva especie de Musaraña del género Cryptotis Pomel 1848 (Mammalia: Soricomorpha: Soricidae) de Ecuador y estatus taxonomico de Cryptotis equatoris Thomas (1912)
In this study four species of shrews of the genus Cryptotis are reported for Ecuador, and a species described here as Cryptotis niausa sp. nov., new for the science, distributed to the highlands of northern Ecuador and distinct from Cryptotis montivagus, which inhabits the grassland and shrublands of southern Ecuador. The new species is characterized by its
Pap. Avulsos Zool. (São Paulo). Publicado em: 2014