نتایج جستجو برای: margalef
تعداد نتایج: 226 فیلتر نتایج به سال:
Little attention has been devoted to lichens of Kerman province (Iran). This study was conducted to identify lichens in the Kuh-Asiab protected area of Kubanan located in the northernmost part of Kerman province. In this study, eight sites were chosen in the area. Sampling was carried out according to Random method. Height data were obtained from each site along with the abundance of lichen spe...
Background and purpose: Flies have a high diversity and are able to transmit many pathogens due to their adaptation and close relationship with humans. Therefore, this study was performed to identify the fauna of medically important flies in the city of Joybar in northern Iran. Materials and methods: This descriptive-analytical study was conducted twice a month in Juybar at selected sites, inc...
The objective of the present study was to determine the effects of fish aggregation device (FAD) deployment on biodiversity, catch composition and length frequency distribution in the Qeshm Island handline fishery. Two FADs were deployed in the Qeshm Island. Four biodiversity indices including Margalef, Shannon-Weaver, Simpson and Pielou and also catch composition and length frequency distribut...
The in-situ photosynthetic activity in tropical intertidal benthic diatom response to environmental variation was assessed this study by measuring chlorophyll fluorescence. investigation carried out during the lowest tide January (non-rainy day) and February 2013 (post-rainy at two sampling sites (A B) from each selected location (Pantai Jerejak, Teluk Bahang Tanjung Bungah, Pulau Pinang, Malay...
the evaluation of the edge effects of forest roads on ecosystem is very useful to understand changes from forest road. with this regard, in this research the effect of main forest road construction on regeneration and biodiversity of established trees in edge of forest road was investigated at 35 m distance into forest area. an existing 10 years old road segment, with same physiographic propert...
The population status and biomass of earthworms were studied in three different land use systems pasture (Pa), silvopasture (SP), mixed evergreen forest (MEF) from 2019–2020 the Solan district Himachal Pradesh, India. aim this study was to assess investigate how influence their abundance, diversity, biomass. Earthworms soil sampled using Tropical Soil Biology Fertility (TSBF) method all seasons...
Sungai Jeriau ialah sungai yang tidak terganggu oleh aktiviti antropogen dan dipercayai mempunyai kualiti air baik serta kepelbagaian biologi akuatik tinggi. Oleh itu suatu kajian telah dijalankan untuk menilai komuniti makroinvertebrat bentik di tersebut mengenal pasti berpotensi sebagai penunjuk ekosistem tanah Persampelan dilakukan pada bulan April 2020 sebanyak sembilan stesen disampel mewa...
The research design of elimination trail has performed in the form of randomized completely blocks design with 3 replications and 8 treatments ( species of needleleaves) in Kohsarkande forests of Neka, Mazandaran(North of Iran). For investigation of the plant biodiversity the treatments of needleleaves in this elimination trail, the aforestation of hard woods(Maple) and the bare area were sel...
Numerical and parametrical indices are two of the most important and most widely used indices for assessing biodiversity in different societies. Nevertheless, their efficiency and selection in various ecosystems has always been one of the challenging issues of ecology. In this study, the numerical indices of diversity, richness and eveness, as well as abundance–ranking distribution models inclu...
This study aimed to compare plant species diversity indices (diversity and richness) and some physico-chemical properties of soil among forest, ecotone and rangeland habitats. Vegetation sampling was done randomly at each habitat. One dominant community was selected in each habitat and one key area was distinguished in each community and 8×1m2 plots were randomly established in each key area. I...
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