نتایج جستجو برای: richness margalef index

تعداد نتایج: 415206  

Journal: :Pertanika journal of tropical agricultural science 2022

Hemipterans are the diverse, abundant, and important pests in paddy ecosystem due to their piercing sucking mouthparts that feed on crop causing significant losses rice yields. Despite roles ecosystem, information DNA barcode, diversity, species richness has been occasionally discussed. This study aimed measure its abundance, richness, barcode hemipteran from ecosystem. Active sampling was used...

Journal: :Jurnal Silvikultur Tropika 2023

Information of vegetation structure and composition terrestrial flora biodiversity can be measured by analysis method. The method requires sampling plots as a measurement plot capable to describe species in forest stand. distribution diversity, especially plants, is relatively dependent on the type plant with condition area it occupies. Therefore, an efficient representative needed for ecosyste...

براری, کامبیز, حجتی, سید محمد, فلاح, اصغر, کاظمی, شهره,

This study was undertaken to investigate the role of forest management in tree diversity, regeneration and vegetation in control and managed parcels of series No. 1 of forestry plan in Khalil-Mahale, Behshahr. Thirty samples with an area of 1000 m2 were systematically and randomly taken with a 100 × 75 m grid in both parcels. In each plot, tree number and species type were recorded. In order to...

This study was carried out in managed and unmanaged Fagus orientalis L. (beech) stands in the Asalem beech forest in order to compare the composition and diversity of plant species. Three V-shaped catena landforms were selected for each stand. Then, large quadrats, 400 m2 area, with selective method and within each of them, small quadrats, 4 m2 area, were established along each catena and slope...

Journal: :Jurnal Biologi Tropis 2022

The Sesaot Nature Tourism Forest Area is a tourist area and an that used for the production of several plantation commodities, along with increasing human activities in area, it raises questions related to state its ecosystem, one aspect reflects namely diversity soil fauna. sample locations are divided into three paths based on characteristics waterway which niche points located river flow, mi...

A.R. Mirzajani, B. Kiabi S.A. Nezami

In the present study, some ecological factors were studied for Amphipoda at different depths. The Shannon, Margalef, and Hill indices were used to determine the  species diversity, richness and evenness, respectively. In addition, the association and niche overlap values were estimated. Indices of species richness and diversity were highest at 50 and 100m depths, respectively.  The ordination o...

Background: Some members of family Calliphoridae are myiasis agents and mechanical vectors of some pathogens. The aim of this study was to measure the biodiversity and synanthropy behaviour of Calliphoridae flies in Abadan, Khuzestan province. Methods:Data were collected based on a monthly schedule during March to December 2014 in urban, semi-urban and rural e...

Journal: :Jurnal Hama dan penyakit tumbuhan tropika 2021

Avian species composition profile and feeding guilds under the aerobic rice field. In Malaysia, productionsystem is an alternative approach to growing in a water-scarce environment. Like irrigated rice, also cansustain diversity of avian fauna. The current status birds fields Malaysia especially ricecondition has not been widely researched. Therefore, this study aims document richness, guildsof...

Journal: :Mosaic 2008

A.R. Mirzajani, B. Kiabi, S.A. Nezami,

In the present study, some ecological factors were studied for Amphipoda at different depths. The Shannon, Margalef, and Hill indices were used to determine the  species diversity, richness and evenness, respectively. In addition, the association and niche overlap values were estimated. Indices of species richness and diversity were highest at 50 and 100m depths, respectively.  The or...

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