We investigate the scenario in which some amount of higher quality habitat is destroyed and is then replaced by some undetermined amount of lower quality habitat. We examined how much low-quality habitat would need to be created to maintain the equilibrium population abundance in the entire geographic area. Using a source–sink model, we find that (1) the number of hectares of created habitat pe...

Biomass harvest may eventually be conducted on over 100 000 000 ha of US crop and forest lands to meet federally-mandated targets for renewable biofuels. Such largescale land use changes could profoundly impact working landscapes and the arthropod communities that inhabit them. We review the literature on dedicated biofuel crops and biomass harvest from forests to look for commonalities in arth...

abstract chemical components of narcissus (narcissus tazetta l.) essential oil investigated under farming and natural habitat conditions in south khorasan province. the essential oil was obtained using solvent extraction method. after purification, the oil was analyzed by capillary gc and gc/ms. 12 compnents making 82/82% of total oil in farm sample and 13 components making 63/86% of total oil ...

We conducted a factorial simulation experiment to analyze the relative importance of movement pattern, boundary-crossing probability, and mortality in habitat and matrix on population density, and its dependency on habitat fragmentation, as well as inter-patch distance. We also examined how the initial response of a species to a fragmentation event may affect our observations of population dens...

2 TABLE OF CONTENTS 3 LIST OF TABLES 4 LIST OF FIGURES 5 INTRODUCTION 6 METHODS Data collection 8 Physical habitat analysis 10 Climatic Influence Analysis 12 Existing Habitat Analysis 13 RESULTS Physical habitat analysis 14 Climatic Influence Analysis 15 Existing Habitat Analysis 17 DISCUSSION Physical habitat analysis 17 Climatic Influence Analysis 21 Existing Habitat Analysis 22 Conservation ...

human habitat change is a complicated issue that many factors play different roles in its formation and distribution. considering this complication, a more comprehensive and holistic approach is needed for a better understanding and management of those factors. the causal frameworks are among systemic and integrated methods for addressing the causes of environmental problems and the relationshi...

this study aimed to investigate the effect of habitat kind on soil seed bank characteristics viz. density diversity, richness and similarity between seed bank and above ground vegetation. two different habitats (grassland and forest) were selected in vaz, mazandaran province. the grassland habitat located in the upper end of the forest habitat, adjacent to each other. then in each habitat, 7 tr...

Variation in growth and habitat use is closely connected to individual responses to habitat specific resource levels and predation risk. In three mountain lakes which differed in the density of young-of-the-year (YOY) arctic char (Sal elinus alpinus), we studied the growth, diets and habitat use of YOY char in relation to resource levels. With two model approaches, we further examined the exten...

Recent neutral landscape models derived from percolation theory predict that a landscape with sparse but contagious habitat coverage is functionally equivalent to one with more abundant but randomly situated habitat patches. We tested this prediction in a field experiment that determined how habitat-patch abundance and configuration affect landscape use by animals. Using a 2 x 2 factorial desig...