نتایج جستجو برای: biodiversity shannon

تعداد نتایج: 46243  

Dorna Rezaei Maziar Haidari

Silvicultural operation need to notice the species diversity. To this study Gomarlang district in marivan region, northern zagros forest was selected. In this study 30 circle sample plots (500 m2) were collected by random method. In every sample plot the kind of species and number of trees and shrub were recorded. In the sample plots the micro plots of 5 m by 5 m (i.e. area of 25 m2) were desig...

Dorna Rezaei Maziar Haidari

Silvicultural operation need to notice the species diversity. To this study Gomarlang district in marivan region, northern zagros forest was selected. In this study 30 circle sample plots (500 m2) were collected by random method. In every sample plot the kind of species and number of trees and shrub were recorded. In the sample plots the micro plots of 5 m by 5 m (i.e. area of 25 m2) were desig...

Abstract Nowadays, Desertification is one of the greatest environmental challenges. It is a global issue and its serious consequences affect on biodiversity, environmental safety, poverty eradication, economic and social stability and sustainable development around the world. Despite the serious environmental, social and economic impact of desertification phenomenon, few studies have been done...

Mountain ranges cover around one-half of Iran, and Zagros ecosystem is considered as one of an important biological site in Iran. Physiographic factors such as altitude and aspect have an important role in plant species distribution. This study was conducted in the Nawa mountain ecosystem in the western side of Zagros ranges, located in the western zone of Iran in 2016. The experiment aim was t...

خلیل‌آبادی, سمیه, سفیانیان, علیرضا, متین‌خواه, سیدحمید, همامی, محمودرضا, کابلی, محمد,

  Determining landscape parameters influencing species richness of habitat patches is one of the most important issues in conservation biology. Many previous studies have investigated the influence of habitat parameters on bird assemblages in forest patches, but studies seeking effects of oasis parameters on bird assemblages are very scarce. Karkas Protected Area is located in semi-arid zone in...

2013
Christian Nold John Tweddle Roger Whitham

Biotagging used audio-visual equipment to engage a range of individuals in ‘tagging’ plants and animals with specific and local meaning to them. This was an experiment in subverting conventional approaches to biodiversity monitoring with the aim of expanding ideas of both biodiversity and citizen science.

2017

Bioprospecting describe the procedure of exploration, extraction, screening and trading of new products using biological diversity as source. Bioprospecting process is a multidisciplinary enterprise that involves various research actors and scientific subjects. Also a bioprospecting program investigates the indigenous understanding about practices and characteristics of medicinal plants and ani...

2001
Roger Blench

Mining, Minerals and Sustainable Development is a project of the International Institute for Environment and Development (IIED). The project was made possible by the support of the World Business Council for Sustainable Development (WBCSD). IIED is a company limited by guarantee and incorporated in England. Reg. No. 2188452. VAT Reg. No. GB 440 4948 50. Registered Charity No. 800066 Mining, Min...

2001
Stevan J. Arnold

Introduction Biodiversity, short for biological diversity, is the variety and variability of living organisms and the ecological complexes in which they live (Primack, 1993). One of the more widely accepted definitions (Noss and Cooperrider, 1994) extends the concept of biodiversity to include “the ecological and evolutionary processes that keep [these systems] functioning, yet ever changing an...

Journal: :CoRR 2009
Ping Li

The Shannon entropy is a widely used summary statistic, for example, network traffic measurement, anomaly detection, neural computations, spike trains, etc. This study focuses on estimating Shannon entropy of data streams. It is known that Shannon entropy can be approximated by Rényi entropy or Tsallis entropy, which are both functions of the αth frequency moments and approach Shannon entropy a...

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