نتایج جستجو برای: biodiversity shannon

تعداد نتایج: 46243  

فرهادیان, امیدوار, ابراهیمی, عیسی, اسداله , سعید , حیدری, صفی‌الله , صداقت, رویا , متقی, ابراهیم , محبوبی صوفیانی, نصرالله,

Phytoplankton are the base of production in aquatic ecosystems and have a major importance in the freshwater environment both in terms of fundamental ecology and in relation to human use of natural resources. The purpose of this research was to determine distribution, abundance and biodiversity of phytoplankton community in Hanna Dam Lake, located in Isfahan province. The sampling was carried o...

Biodiversity is one of the important concepts in ecology and vegetation management, and plays an important role in the health, production, and evaluation of ecosystems. Species diversity is a major part of biodiversity and one of the most important parameters of ecosystem changes. In this research, the data of the rangeland evaluation different climate zones of Isfahan province were used in fiv...

Journal: :علوم دامی 0
بیژن محمودی دانشجوی دکترای تخصصی، دانشگاه دولتی باکو مرتضی دلیری استادیار، پژوهشگاه ملی مهندسی ژنتیک و زیست فن آوری رامین حبیبی دانشجوی دکترای تخصصی، دانشگاه زابل

assessing genetic biodiversity and population structure of minor populations through the information provided by neutral molecular markers, allows determination of their extinction risk and to design strategies for their management and conservation. analysis of microsatellite loci is known to be highly informative in the reconstruction of the historical processes underlying the evolution and di...

  Differences between plant biodiversity and grazing pastures grazed under improved management of rangeland habitat is of particular importance. The purpose of this study was to compare semi-steppe rangeland vegetation of Prdanan in the city of Piranshahr in the field under grazed and enclosed sites were considered. Sampled in both grazed and systematic random pastured five 40 meters trans...

2012
Martin Pfeiffer Dirk Mezger

Biodiversity assessment of tropical taxa is hampered by their tremendous richness, which leads to large numbers of singletons and incomplete inventories in survey studies. Species estimators can be used for assessment of alpha diversity, but calculation of beta diversity is hampered by pseudo-turnover of species in undersampled plots. To assess the impact of unseen species, we investigated diff...

Journal: :Entropy 2017
Bruce T. Milne Vijay K. Gupta

Stream networks are branched structures wherein water and energy move between land and atmosphere, modulated by evapotranspiration and its interaction with the gravitational dissipation of potential energy as runoff. These actions vary among climates characterized by Budyko theory, yet have not been integrated with Horton scaling, the ubiquitous pattern of eco-hydrological variation among Strah...

2017
Irene Martín-Forés Greg R Guerin Andrew J Lowe

Weeds are commonly considered a threat to biodiversity, yet interactions between native and exotic species in grasslands are poorly understood and reported results vary depending on the spatial scale of study, the factors controlled for and the response variables analysed. We tested whether weed presence and abundance is related to declines in biodiversity in Australian grasslands. We employed ...

Journal: :Scientific reports 2016
Jingfei Guo Kanglai He Richard L Hellmich Shuxiong Bai Tiantao Zhang Yunjun Liu Tofael Ahmed Zhenying Wang

Possible non-target effect of transgenic cry1Ie maize exerts on natural enemy community biodiversity in the field is unresolved. In the present study, a 2-yr comparison of transgenic cry1Ie maize (Event IE09S034, Bt maize) and its near isoline (Zong 31, non-Bt maize) on natural enemy community biodiversity were compared with whole plant inspections, pitfall traps and suction sampler. Natural en...

2016
Didot Budi Prasetyo Nobuko Tuno

We compared aquatic invertebrate diversity in paddy fields under traditional and modern management practices. We also examined the general factors that may be related to diversity within each paddy field. The Kitadan area was farmed with traditional management practices, with much longer periods of irrigations compared with the Kahoku area, which was farmed with modern agricultural practices us...

Journal: :محیط زیست طبیعی 0
ساره حسینی دانشجوی دکتری جنگلداری دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری سید عطاء اله حسینی دانشیار گروه جنگلدای و اقتصاد جنگل دانشگاه تهران

in this study, species richness, evenness and vegetation biodiversity were investigated in stabilized and non-stabilized cut edge areas of chachkam district forest roads in sari forest of iran. 18 micro plots 1×1m (36 micro plots) were sampled to carry out this research on two cut edge areas. number of trees, shrubs and herbaceous were recorded in each micro-plot. significant difference was inv...

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