background: corvidae is a cosmopolitan family of oscine birds including crows, rooks, mag­pies, jays, chough, and ravens. these birds are migratory species, especially in the shortage of foods, so they can act like vectors for a wide range of microorganisms. they live generally in temper­ate climates and in a very close contact with human residential areas as well as poultry farms. there is no ...

Aim (i) To assess the dependence between form of decrease in biological similarity with distance (distance-decay) and species range size (ii) to introduce use a sigmoidal model, Gompertz function, as flexible alternative able fit distance-decay models under wide variety sizes. Location Applicable worldwide. Methods We computed curves from simulated communities how sizes shape functional pattern...

Sustainable range management needs the accurate estimation yield and determining of grazing capacity in rangelands. It is easy to obtain yield estimation with indirect methods. For this purpose, the relation between cover and forage yield of range species were studied in steppic rangelands of Yazd. Measurements of cover and forage yield were carried out with plot area and clipping and weighting...

This study aimed to identify the most important physical variables affecting the distribution of four range plants species (Tamarix aphylla, Calligonum comosum, Prosopis spicigera and Salsola rigida) habitats and to prepare potential habitat map of the species using Maximum Entropy (MaxEnt) method in rangelands of Jiroft city, Kerman province, located in SE Iran. To this end, sampling of vegeta...