Population size, density, spatial distribution and dispersal in an Austrian population of the land snail Arianta arbustorum styriaca (Gastropoda: Helicidae)

Census method for estimating the population size of the endemic and threatened land snail

Census method for estimating the population size of the endemic and threatened land snail Iberus gualtieranus gualtieranus.— Iberus gualtieranus gualtieranus is an endemic and threatened land snail inhabiting south–eastern Spain. Because it seeks shelter in karstic fissures when inactive, detection is difficult, and censuses may be biased. In this study, a methodology is developed to take an ad...

Density-dependent dispersal and population aggregation patterns.

We have derived reaction-dispersal-aggregation equations from Markovian reaction-random walks with density-dependent jump rate or density-dependent dispersal kernels. From the corresponding diffusion limit we recover well-known reaction-diffusion-aggregation and reaction-diffusion-advection-aggregation equations. It is found that the ratio between the reaction and jump rates controls the onset ...

Spatial Distribution Of Iranian Population In Canada: A Portrait Using The 2001 Census Data

Diplomacy and the pattern of spatial distribution of activity and population in border villages Case: Zahak county

Introduction The government is the first and most powerful decision-maker and actor in the field of spatial structure. Spatial structure is an essential part of the battle for control and protection of individuals and society. In fact, spatial planning and land use management is the manifestation of the government authority in the form of setting rules and allocating resources and decision-mak...

Distribution and Population Density of Cereal Cyst Nematode in Ardabil Province

Ebrahimi L, TanhaMaafi Z, KarbalaeiKhiavi H, Didehbaz G, Azarmi Y and Zamani R (2019) Distribution and population density of cereal cyst nematode in Ardabil province. Plant Pathology Science 8(2):9-15. DOI: 10.2982/PPS.8.2.9 Introduction: Cereal cyst nematodes (CCN), Heterodera species, are important parasitic nematodes of cereal. Potato cyst nematodes (PCN), Globodera species, are also seriou...