knowledge about spatial soil variation in terms of measured pedodiversity offers the possibility to estimate the quality and variance within a soil map. diversity indices and abundance distribution models are statistical tools which ecologists have applied for decades for analyzing the intrinsic regularities of various ecological entities. in this study relationships between soils evolution, la...

—We addressed the following question: Do conifers within aspen stands (conifer invasion) increase bird species diversity in western landscapes? We tested the hypotheses that bird species diversity, measured as species richness or with the Shannon-Weiner diversity index, responds to aspen-conifer ratios (from 0% to 100% conifer) in a quadratic manner with a maximum occurring at an intermediate r...

introduction agricultural biodiversity has spatial, temporal and scale dimensions especially at agro-ecosystem levels. these agro-ecosystems that are used for agriculture are determined by three sets of factors: the genetic resources (biodiversity), the physical environment and the human management practices. most agricultural areas can be returned to their natural landscape after subsequent ge...

Species are by de¢nition di¡erent from each other. This fact favours ranking rather than additive indices. However, ecologists have measured species diversity in terms of species richness, orbycombining species richnesswith the relative abundance of species within an area. Both methods raise problems: species richness treats all species equally, while relative abundance is not a ¢xed property o...

biodiversity consists of wide range diversity such as genetic diversity, species diversity and ecosystem diversity. nowadays, agrobiodiversity conservation is one the most important aspects of sustainable agriculture. in this research, agrobiodiversity in farmlands, gardens and home garden systems was assessed and compared. in addition the role of home gardens as an effective strategy in in-sit...

We used pitfall trapping to investigate the effects of elevation, plant density and soil structure on species diversity and the impact of these habitat factors on lizard habitat selectivity in the Qom Province in the Central Plateau of Iran. From a total of 12 1-ha plots, we captured 363 individuals of 15 species of lizards (six species of Lacertidae, five species of Agamidae, two species of Ge...

this checklist aims to reviews and summarize the results of the systematic and zoogeographical research on the iranian inland ichthyofauna that has been carried out for more than 200 years. since the work of j.j. heckel (1846-1849), the number of valid species has increased significantly and the systematic status of many of the species has changed, and reorganization and updating of the publish...

Evaluating components of landscape diversity is essential for the implementation of efficient conservation strategies. We evaluated the diversity of Odonata larval assemblages from the Coalcomán mountains (CM), Michoacán, Mexico, and related it to local (site-level) habitat variables. Larvae were collected from shores, riffles and pools in five streams, counted and identified to species, twice ...