Skip to main content
USGS - science for a changing world
Advanced Search

Filters: Tags: landscape heterogeneity (X)

3 results (8ms)   

Filters
Date Range
Extensions
Types
Contacts
Categories
Tag Types
Tag Schemes
View Results as: JSON ATOM CSV
thumbnail
Synopsis: This study evaluates whether previous observations of a higher percentage of parasitism and parasitoid diversity in a complex agricultural landscape, relative to a simple landscape, represent a general phenomenon. Rates of parasitism and parasitoid diversity of the armyworm (Pseudaletia unipuncta) were assessed in three replicate (Onondaga, Ingham, and Benton) regions in southern Michigan. Within each region, a simple landscape (primarily cropland) and a complex landscape (cropland intermixed with mid and late successional noncrop habitats) were identified through analysis of aerial photographs. In each landscape, three maize fields were selected, and second to fourth instar P. unipuncta were released...
Conclusions: Globally, the pattern of East/South-East Asian rice paddy belts have higher ecosystem/habitat diversity index values than Eurasian, American, and Australian wheat or corn belts. Thresholds/Learnings: Synopsis: The most critical of the issues faced in addressing the targets of the Convention of Biological Diversity are ‘biodiversity conservation under agricultural development’ and ‘the sustainable use of natural resources and/or land’. Therefore, appropriate indicators for the status of biodiversity and the pressures placed on biodiversity in relation to the intensification of agriculture are needed. Agricultural development has had major impacts on biodiversity and the abandonment of traditional land...


    map background search result map search result map Does agricultural landscape structure affect parasistism and parasitoid diversity? Does agricultural landscape structure affect parasistism and parasitoid diversity?