نتایج جستجو برای: species diversity index

تعداد نتایج: 1072319  

Journal: :جنگل و فرآورده های چوب 0
علی اشرف مهرابی عضو هیأت علمی دانشکده کشاورزی و منابع طبیعی دانشگاه ایلام پیمان غلامی دانشگاه آزاد اسلامی واحد کرمانشاه علیرضا اطمینان استادیار اصلاح نباتات، دانشگاه آزاد اسلامی واحد کرمانشاه، دانشکده دانشکده تحصیلات تکمیلی سمیرا محمدی دانشکده کشاورزی و منابع طبیعی دانشگاه ایلام

pistacia atlantica subsp. mutica is one of the most valuable forest tree species in iran that has been severely exploited for a long time. therefore, understanding the genetic diversity of different populations can be an important step towards the development and restoration of the habitat of this invaluable tree species. in this study, in order to study the genetic diversity, 10 populations in...

Journal: :مجله بین المللی زیست و زیست پزشکی 0
emmanuel okrikata depafederal university wukari, taraba state, nigeria olajumoke anuoluwa yusuf depafederal university wukari, taraba state, nigeria

a field survey was conducted in wukari, taraba state to assess the diversity and abundance of insect species in selected habitats (residential, open field made up of grassland and an agroecosystem). sampling were done biweekly using light, pitfall and yellow pan traps set in 3 replicates, 30 m apart. insects recovered were wet preserved in 70% ethanol except butterflies and moths. representativ...

A.R. Pazira, H. Salehi, R. Obeidi,

This study aims to identify and determine species diversity and richness of the Gastropods of the intertidal zone of Bushehr seaport coastal area and assess the ecological status of this area using Welch index. Sampling was carried out at 6 stations in Bushehr seaport in the winter and summer seasons during 2013-2014. Bed sediment sampling was done three times in each station and Gastropod samp...

A. Abdoli B.H. Kiabi S.M. Kalantarian,

The gobies are non-commercial fishes in the Iranian waters of the Caspian Sea for which population dynamics and stock status are poorly known. In this survey, we tried to define species diversity and catch per unit effort (CPUE) of Gobiidae by using beach seine nets in Salmanshahr, the southern Caspian Sea. From March 2011 to April 2012, 224 specimens representing 4 gobiid species, belonging to...

Journal: :international journal of advanced biological and biomedical research 0
maziar haidari young researchers club, sanandaj branch, islamic azad university, sanandaj, iran

silvicultural operation need to notice the plant species diversity in forest. to this study gomarlang district in marivan region, northern zagros forest was selected. selected 100 ha area because have similar physiography condition (north aspect and 1650 to 1800 m s.a.l. in study area 100 micro plots of 5m by 5 m (25 m2) including the species and the numbers of this species randomized-systemati...

Emmanuel Okrikata, Olajumoke Anuoluwa Yusuf,

A field survey was conducted in Wukari, Taraba State to assess the diversity and abundance of insect species in selected habitats (residential, open field made up of grassland and an agroecosystem). Sampling were done biweekly using light, pitfall and yellow pan traps set in 3 replicates, 30 m apart. Insects recovered were wet preserved in 70% ethanol except butterflies and moths. Representativ...

Determination of factors affecting on species distribution and diversity, especially in desert areas is the most important factor in rangeland ecosystems management for encountering biological stress. In order to evaluate the effect of physiographic factors on plant biodiversity in natural ecosystems of Kakhk Gonabad, this research was conducted in spring 2014. First, by overlaying four maps of...

Journal: :iranian journal of fisheries science 0
s.m. kalantarian a. abdoli b.h. kiabi

the gobies are non-commercial fishes in the iranian waters of the caspian sea for which population dynamics and stock status are poorly known. in this survey, we tried to define species diversity and catch per unit effort (cpue) of gobiidae by using beach seine nets in salmanshahr, the southern caspian sea. from march 2011 to april 2012, 224 specimens representing 4 gobiid species, belonging to...

ژورنال: زیست شناسی دریا 2020
Ganjian Khenari, Ali , Oskoein, Roghayeh , Zakerimehr, Mohammad Reza ,

Phytoplankton plays an important role in the material cycle and energy flow of the ecosystem, Therefore in this study, the distribution, frequency, and biodiversity of phytoplankton in Elimalat Lake were investigated. Sampling was performed in Elimalat Lake sessonally, located in Nur City, Mazandaran province, in 2019. In this study, 70 species of phytoplankton were classified into 5 phylum ...

Ecological condition including physiographic factors have impact bon plant species diversity. There for it is necessary to investigate at the ecological condition in other to achieve sustainable development and natural ecosystem conservation. The present study aim is investigate the effect of physiographic factors (altitude and geographic directions) on the biological diversity of plant species...

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