The Experts below are selected from a list of 77211 Experts worldwide ranked by ideXlab platform
Guy Van Laere - One of the best experts on this subject based on the ideXlab platform.
-
Population density and small-scale variation in Habitat Quality affect phenotypic Quality in roe deer
Oecologia, 2001Co-Authors: Nathalie Pettorelli, Jean-michel Gaillard, Patrick Duncan, Jean-pierre Ouellet, Guy Van LaereAbstract:We tested for fine-scale spatial heterogeneity in Habitat Quality in a roe deer (Capreolus capreolus) population in the Chize reserve located in western France by measuring spatial variation in the availability and plant nitrogen content of principal and preferred plant species. There were significant differences in Habitat Quality within the reserve: the principal food plants in spring and summer occurred more frequently in the oak woodland in the north than in the beech woodland in the south of the reserve. Within species, plants in the north had higher nitrogen contents than in the south. There was a positive spatial covariation between Habitat Quality, local density and fawn body weight: animal densities and fawn body weights were highest in the north, the best Habitat (i.e. the Habitat with more abundant food of higher Quality). These results differ from those recently obtained on red deer (Cervus elaphus). We suggest that spatial organization and foraging behaviour must be accounted for when considering the effect of Habitat Quality on individual fitness of ungulates.
-
Population density and small-scale variation in Habitat Quality affect phenotypic Quality in roe deer
Oecologia, 2001Co-Authors: Nathalie Pettorelli, Jean-michel Gaillard, Patrick Duncan, Jean-pierre Ouellet, Guy Van LaereAbstract:We tested for fine-scale spatial heterogeneity in Habitat Quality in a roe deer (Capreolus capreolus) population in the Chizé reserve located in western France by measuring spatial variation in the availability and plant nitrogen content of principal and preferred plant species. There were significant differences in Habitat Quality within the reserve: the principal food plants in spring and summer occurred more frequently in the oak woodland in the north than in the beech woodland in the south of the reserve. Within species, plants in the north had higher nitrogen contents than in the south. There was a positive spatial covariation between Habitat Quality, local density and fawn body weight: animal densities and fawn body weights were highest in the north, the best Habitat (i.e. the Habitat with more abundant food of higher Quality). These results differ from those recently obtained on red deer (Cervus elaphus). We suggest that spatial organization and foraging behaviour must be accounted for when considering the effect of Habitat Quality on individual fitness of ungulates.
Elizabeth Rogers - One of the best experts on this subject based on the ideXlab platform.
-
Habitat Quality and Activity Budgets of White-Headed Langurs in Fusui, China
International Journal of Primatology, 2004Co-Authors: Elizabeth RogersAbstract:Within a species, Habitat Quality may be a factor causing different activity budgets between populations. The Habitat of white-headed langurs (Trachypithecus leucocephalus) has been seriously disturbed in Fusui Rare and Precious Animal Nature Reserve, China, where we carried out a study of their socioecology from September 1997 to September 1998. We collected data on langur activity budgets from the main population located in the central part of a group of limestone hills. We classified Habitat Quality into 4 grades according to the extent of human disturbance. We showed that the two main study groups of white-headed langurs spent on average 50% of time resting, 13% feeding, 18% moving (including foraging), 11% grooming, and 7% playing. Langur time budgets showed no significant seasonal change, but they differed among different sex-age classes. Infants and juveniles spent about 20.3% of time playing, whereas adults spent only 0.2% playing. The group in high Quality Habitat engaged less in feeding and more in playing than the group in low Quality Habitat did. Habitat Quality influenced the playing time of young white-headed langurs and may be vital to their successful maturation.
Nathalie Pettorelli - One of the best experts on this subject based on the ideXlab platform.
-
Population density and small-scale variation in Habitat Quality affect phenotypic Quality in roe deer
Oecologia, 2001Co-Authors: Nathalie Pettorelli, Jean-michel Gaillard, Patrick Duncan, Jean-pierre Ouellet, Guy Van LaereAbstract:We tested for fine-scale spatial heterogeneity in Habitat Quality in a roe deer (Capreolus capreolus) population in the Chize reserve located in western France by measuring spatial variation in the availability and plant nitrogen content of principal and preferred plant species. There were significant differences in Habitat Quality within the reserve: the principal food plants in spring and summer occurred more frequently in the oak woodland in the north than in the beech woodland in the south of the reserve. Within species, plants in the north had higher nitrogen contents than in the south. There was a positive spatial covariation between Habitat Quality, local density and fawn body weight: animal densities and fawn body weights were highest in the north, the best Habitat (i.e. the Habitat with more abundant food of higher Quality). These results differ from those recently obtained on red deer (Cervus elaphus). We suggest that spatial organization and foraging behaviour must be accounted for when considering the effect of Habitat Quality on individual fitness of ungulates.
-
Population density and small-scale variation in Habitat Quality affect phenotypic Quality in roe deer
Oecologia, 2001Co-Authors: Nathalie Pettorelli, Jean-michel Gaillard, Patrick Duncan, Jean-pierre Ouellet, Guy Van LaereAbstract:We tested for fine-scale spatial heterogeneity in Habitat Quality in a roe deer (Capreolus capreolus) population in the Chizé reserve located in western France by measuring spatial variation in the availability and plant nitrogen content of principal and preferred plant species. There were significant differences in Habitat Quality within the reserve: the principal food plants in spring and summer occurred more frequently in the oak woodland in the north than in the beech woodland in the south of the reserve. Within species, plants in the north had higher nitrogen contents than in the south. There was a positive spatial covariation between Habitat Quality, local density and fawn body weight: animal densities and fawn body weights were highest in the north, the best Habitat (i.e. the Habitat with more abundant food of higher Quality). These results differ from those recently obtained on red deer (Cervus elaphus). We suggest that spatial organization and foraging behaviour must be accounted for when considering the effect of Habitat Quality on individual fitness of ungulates.
Aaron D Flesch - One of the best experts on this subject based on the ideXlab platform.
-
spatial temporal and density dependent components of Habitat Quality for a desert owl
PLOS ONE, 2015Co-Authors: Aaron D Flesch, Richard L Hutto, Willem J D Van Leeuwen, Kyle Hartfield, Sky JacobsAbstract:Spatial variation in resources is a fundamental driver of Habitat Quality but the realized value of resources at any point in space may depend on the effects of conspecifics and stochastic factors, such as weather, which vary through time. We evaluated the relative and combined effects of Habitat resources, weather, and conspecifics on Habitat Quality for ferruginous pygmy-owls (Glaucidium brasilianum) in the Sonoran Desert of northwest Mexico by monitoring reproductive output and conspecific abundance over 10 years in and around 107 territory patches. Variation in reproductive output was much greater across space than time, and although Habitat resources explained a much greater proportion of that variation (0.70) than weather (0.17) or conspecifics (0.13), evidence for interactions among each of these components of the environment was strong. Relative to Habitat that was persistently low in Quality, high-Quality Habitat buffered the negative effects of conspecifics and amplified the benefits of favorable weather, but did not buffer the disadvantages of harsh weather. Moreover, the positive effects of favorable weather at low conspecific densities were offset by intraspecific competition at high densities. Although realized Habitat Quality declined with increasing conspecific density suggesting interference mechanisms associated with an Ideal Free Distribution, broad spatial heterogeneity in Habitat Quality persisted. Factors linked to food resources had positive effects on reproductive output but only where nest cavities were sufficiently abundant to mitigate the negative effects of heterospecific enemies. Annual precipitation and brooding-season temperature had strong multiplicative effects on reproductive output, which declined at increasing rates as drought and temperature increased, reflecting conditions predicted to become more frequent with climate change. Because the collective environment influences Habitat Quality in complex ways, integrated approaches that consider Habitat resources, stochastic factors, and conspecifics are necessary to accurately assess Habitat Quality.
Feng Tang - One of the best experts on this subject based on the ideXlab platform.
-
land use change in changli county china predicting its spatio temporal evolution in Habitat Quality
Ecological Indicators, 2020Co-Authors: Feng Tang, Li Wang, Pengtao ZhangAbstract:Abstract Rapid urbanisation and expansion of residential, industrial, and traffic areas have greatly changed regional land-use patterns and have directly affected Habitat Quality and biodiversity. Assessing and predicting the spatio-temporal evolution and future development trends of Habitat Quality under the influence of land-use change can provide a scientific basis for regional natural environment conservation and land-use planning. To calculate land-use patterns across space and time, we used different data sources including land-use change surveys, meteorology, statistical yearbooks, and digital elevation model data in Changli County. We modelled past, present and future land-use change with two different models (Cellular automata-Markov and CLUE-S) and integrated them separately to Habitat Quality modelling using the integrated valuation of environmental services and trade-offs model. With this we aimed to provide a reference for future implementations of ecological restoration work and adjustments of land-use policies for decision-makers. The estimations showed that Habitat Quality declined from 2004 to 2028 because of the continuous increase in residential land and traffic area, whereas other land types continued to decline. Furthermore with this study we provide a new method for monitoring and simulating Habitat Quality.
