نتایج جستجو برای: richness margalef index

تعداد نتایج: 415206  

Journal: : 2022

Resume. To study the taxonomic composition, population level and microecological indices of ecosystem "macroorganism-microbiota" purulent contents tympanic cavity in patients with chronic mesotympanitis.Materials methods. The samples (ears discharge) taken from 78 (38-64 years old) mesotympanitis were used this study.A bacteriological examination selected was carried out by isolating identifyin...

Journal: :F1000Research 2023

Background: This study focused on evaluating the diversity and richness of edaphic macrofauna in eight banana farms western zone Nicaragua. Methods: The sampling design was random descriptive, it divided into two phases, first collection sample, second classification, coding, storage extracted populations. Subsequently, indices spe...

2008
Boniface Oluoch Oindo

The energy hypothesis predicts that, in regions of roughly equal area, energy flux per unit of area should be the prime determinant of species richness. In the case of plants, primary production represents realized energy capture. Potential evapotranspiration is a measure of community energy use and it is related to terrestrial primary productivity. The best correlate of the latter on regional ...

The aim of the study was to investigate affecting environmental factors on functional diversity indices and species diversity for the fluctuation of the management according to the ecological conditions in Raver rangeland. To determine the functional attributes of rangeland plants, 12 height points were selected along elevation gradient those were distance between them100 meters. 5 sampling plo...

It has been paid less attention to effect of environmental factors on species richness and diversity indices in fragile ecosystems around Playa. Therefore this study was conducted to evaluate the effect of geographical directions and distance from Playa salt layer on the composition and species diversity in Sirjan Playa, Kerman Province, Iran. Determination of intervals 10, 1000 and 2000 mete...

2018
Chenxia Liang Gang Feng Xingfeng Si Lingfeng Mao Guisheng Yang Jens-Christian Svenning Jie Yang

Bird species richness is mediated by local, regional, and historical factors, for example, competition, environmental heterogeneity, contemporary, and historical climate. Here, we related bird species richness with phylogenetic relatedness of bird assemblages, plant species richness, topography, contemporary climate, and glacial-interglacial climate change to investigate the relative importance...

Journal: :Bioscience Journal 2021

Plans for an agro-ecological system agricultural production must consider vegetal diversification in properties because, among other advantages, it can help the biological control of pests when focuses on such end. Predator ladybeetles (Coleoptera: Coccinellidae) be found different environments; they play important role control. The aims present study were to feature ladybeetle populations thro...

اسحاقی راد , جواد, متاجی, اسداله, واحدی, علی اصغر,

Soil organic carbon pool plays an important role in the global C cycle and climate change mitigation. Therefore, improving our understanding of some factors such as plant biodiversity that can affect forest soil C storage is fundamentally important for anticipating changes. This study was carried out in the mixed-beech forests of Glandrood located in Noor using a systematic network of points in...

2012
A. Provenzale

To overcome sinking, plankton have devised various types of strategies. One is swimming, that is, an active, energy-consuming self-propulsion than can oppose gravitational sinking. Other phytoplankters can modify their buoyancy, becoming, at least for some time, positively buoyant. Others can exploit the turbulence in the mixed layer, using it to stay suspended for longer times. This latter opt...

Journal: :Forests 2022

This study sought to clarify the composition of soil fungal and bacterial communities along an elevation gradient in arid montane ecosystem as well influence environmental factors (soil properties, climate, topography, plant diversity) upon microbial community structures. Four vegetation types—montane desert steppe (mean elevation: 1761 m), shrub 2077 subalpine coniferous forest 2485 2903 m)—we...

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