نتایج جستجو برای: evenness simpson

تعداد نتایج: 5643  

Species diversity protection will ensure the protection of natural processes and ecological values. Appropriate information on the condition and location of endanger species will facilitate the management and conservation of forest areas. The present study was conducted in Arasbaran forests for the purpose of evaluating two sampling methods including circular sampling (1000 m2 area) and the nea...

Journal: :Frontiers in Marine Science 2023

Climate change is known to have significant impacts on coastal marine ecosystems. However, a good understanding of the exact requires consistent long-term monitoring programs, which are not available for many The Hudson River Estuary (HRE) provides critical habitats estuarine, freshwater, and diadromous species. Longitudinal Ichthyoplankton Survey Water Quality in Biological Monitoring Program ...

Knowledge of the relationships between biotic components of rangeland ecosystem i.e. herbivores and plants is important for range managers. In order to study herbivorse grazing intensity on plant species diversity, an experiment was conductef using fuor grazing treatments in darrehshar rangelands, Ilam province in 2015. Plant species data were taken based on a randomized-systematic sampling met...

Ahmad Savari, Babak Doustshenas, Mehrnaz Shirmohammadi, Nasrin Sakhaei, Simin Dehghan Mediseh,

This study was undertaken to survey impacts of bottom trawling on distribution and diversity of gastropods of the Bahrakan Fishing Area (BFA), of the northwestern coasts of the Persian Gulf. Gastropod samples were collected from depths of 6m and 10m at 18 randomly selected stations in three occasions, right before the opening of shrimp trawling seasonand two weeks and 3 months after the fish...

Journal: :جنگل و فرآورده های چوب 0
بیت الله امان زاده دانشجوی دکتری علوم جنگل، دانشکدﮤ منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران محمد رضا پورمجیدیان دانشیار، دانشکدﮤ منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران خسرو ثاقب طالبی دانشیار پژوهش، مؤسسة تحقیقات جنگل‏ها و مراتع کشور، تهران، ایران سید محمد حجتی دانشیار، دانشکدﮤ منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

in order to study the effect of canopy gap size on species diversity and composition in mixed stands, a reserved area which located in asalem forests was selected. all of gaps in this area identified and were divided into four categories: small gaps (1000 m2). in each category, 21 of gaps with a relatively homogeneous in terms of an aspect and slope were selected. the major and minor diameter o...

Journal: :Jurnal Biodjati 2021

Indonesia is a megadiverse country. Butterflies become one of the Indonesian diversities. has second-highest butterfly species in world with more than 2000 species. Flower plants are used by butterflies as hostplants and foodplant. The aims this research were to know butterflies’ diversity food Mount Muria at Kudus City, Central Java. quadran sampling transect method three stations (along 2 km)...

Journal: :Journal of the Textile Machinary Society 1957

Journal: :Limnology and freshwater biology 2023

Abstract. This research was investigated the seasonal changes in phytoplankton, bacterioplankton and autotrophic picoplankton as well environmental parameters photic layer of Lake Baikal. Using microscopy methods, 43 species belonging to Bacillariophyta, Dinophyta, Chlorophyta, Chrysophyta, Cryptophyta, Haptophyta, Charophyta Cyanoprokaryota have been identified. Bacillariophyta Chlorophyta wer...

2010
Lou Jost

Contrary to common belief, decomposition of diversity into independent richness and evenness components is mathematically impossible. However, richness can be decomposed into independent diversity and evenness or inequality components. The evenness or inequality component derived in this way is connected to most of the common measures of evenness and inequality in ecology and economics. This pe...

Journal: :Turkish Journal of Forestry 2021

The study was carried out to compare the biodiversity parameters of insect species in natural and un-natural habitats Gölcük Nature Park (Isparta Province) between 2018 2019. Two two unnatural (impact tourism) were selected realize mentioned aim. Totally 40 pitfall traps (10 for each habitat) set up sample Coleoptera species. Species richness found higher than ones. Diversity index (both Shanno...

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