One commonly studied driver of community assembly is the eff ect of dominant species on subordinate species. Dominant species may impact community assembly during competitive sorting, or recruitment. For ants, important and abundant species in the tropics, several factors may drive community assembly including competition, dispersal, priority eff ects, and environmental conditions. Although com...

ninteen samples of dust from wool and carpet-weaving places around tabriz were collected. dust mites of wool and carpet-weaving places were separated and identified based on morphological characteristics. genus and species of mites per gram of dusts, were determined. the results showed that dominant population of mites were:dermatophagoides farinae (64%), dermatophagoides pteronyssinus (21.5%),...

A survey was carried out to investigate the frequency of hard tick species (Acari: Ixodidae) on sheep in Khorasan Razvi province. A total of 812 ticks were collected from the sheep of different areas of Khorsan Razavi province five species were identified as follow: Rhipicephalus turanicus (59.23%), Hyalomma.marginatum turanicum (25.73%), Hyalomma excavatum (14.8%), Hyalomma anatolicum (8.3...

Zooplankton samples were taken seasonally from Hancağız Dam Lake between April 2012- May 2013 period. During the study, a total of 52 species (34 belong to genus Rotifera, 11 to Cladocera and 7 Copepoda) were found in Hancağız Dam Lake.Based on the number of individuals, rotifers were the dominant group in the dam lake (65.4%) followed by Cladocera (21.2%) and Copepoda (13.4%).All of the zoopla...

In nature, plant biomass is not evenly distributed across species, and naturally uncommon species may differ from common species in the probability of loss from the community. Understanding relationships between evenness and productivity is therefore critical to understanding changes in ecosystem functioning as species are lost from communities. We examined data from a large multi-site grasslan...

An abrupt global warming event has been recorded in many parts of the world in sediments of Latest Maastrichtian age between 65.45-65.10 Ma. This warm event was documented here at a section near Ziyarat-kola in Central Alborz based on analysis of planktonic foraminifera. An unusual abundance of normally large-size species such as Globotruncana arca, Globigerinelloides subcarinatus, Pseudoguembe...

Numerous species of insects have been recorded from various types of manure in commercially reared birds from different parts of the world. This study was carried out to determine parasitic beetle populations in commercial rearing house litter from different regions of the West Azerbaijan province in Iran. Atotal of 60 samples of litter were collected from June 2008 to November 2009 from 20 pou...

abstract squamata or scaled reptiles are the largest order of new reptiles including lizards, snakes and amphisbaenia. they have formed 95 precent of new reptiles. our goal is lizard biodiversity of torbat-e heydaryeh in razavi khorasan province. the study of lizards biodiversity of torbat-e heydaryeh in razavi khorasan province was carried out in 2012 until 2013. in this research 132 specimens...

numerous species of insects have been recorded from various types of manure in commercially reared birds from different parts of the world. this study was carried out to determine parasitic beetle populations in commercial rearing house litter from different regions of the west azerbaijan province in iran. atotal of 60 samples of litter were collected from june 2008 to november 2009 from 20 pou...