نتایج جستجو برای: richness margalef index

تعداد نتایج: 415206  

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2012
A L Marsaro Júnior D B Nascimento B Ronchi-Teles R Adaime

The purpose of this work was to describe the population patterns of Anastrepha in three municipalities of the state of Roraima, Brazil, via faunistic analysis. Weekly collections were performed from January through December 2008, using McPhail traps containing 5% hydrolysed protein, in domestic orchards in the municipalities of Boa Vista, Bonfim and Pacaraima. We captured 301 females of Anastre...

2016
Peiqin Li Zhou Wu Tao Liu Yanan Wang

This study investigated the biodiversity, phylogeny, and antifungal activity of endophytic fungi isolated from Zanthoxylum bungeanum. A total of 940 isolates obtained were grouped into 93 morphotypes, 43 species, and 23 genera, which were authenticated by molecular identification based on rDNA internal transcribed spacer (ITS) sequence analysis. A high diversity of endophytic fungi from Z. bung...

Journal: :جنگل و فرآورده های چوب 0
مهرداد میرزایی دانشجوی دکتری جنگلداری دانشکدة منابع طبیعی دانشگاه گیلان، صومعه‏سرا، ایران امیر اسلام بنیاد دانشیار گروه جنگلداری دانشکدة منابع طبیعی دانشگاه گیلان، صومعه‏سرا، ایران حسن پوربابایی دانشیار گروه جنگلداری دانشکدة منابع طبیعی دانشگاه گیلان، صومعه‏سرا، ایران محبوبه محبی بیجارپس دانشجوی دکتری جنگلداری دانشکدة منابع طبیعی دانشگاه گیلان، صومعه‏سرا، ایران

aim of this research was evaluated and compared of density (number tree per hectare), basal area and volume characteristics for estimation of tree species diversity in degraded forests. in order to, 73 hectares of kouhmian forests was inventory based on random systematic pattern with circular plots (10r and 26 plots). in each plot species, dbh and number of tree were measured and recorded. to e...

ژورنال: علمی شیلات ایران 2019

Zooplanktons have an important role in food chain of the aquatic ecosystems, which acts as a food chain link between producers (phytoplankton) and higher nutritional levels. The purpose of this research was to identify and study the zooplankton density in the southeastern basin of the Caspian Sea (Gorgan Bay). Sampling was performed seasonally and samples were collected by zooplankton net (36 c...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2016
M S G Moura E Silva T S Graciano M E Losekann A J B Luiz

Biomonitoring is a cheap and effective tool for evaluation of water quality, and infer on the balance of aquatic ecosystems. The benthic macroinvertebrates are bioindicators sensitive to environmental changes, and can assist in detecting and preventing impacts such as organic enrichment and imbalance in the food chain. We compared the structure of benthic communities on artificial substrate sam...

2015
Kristine Engemann Brian J Enquist Brody Sandel Brad Boyle Peter M Jørgensen Naia Morueta-Holme Robert K Peet Cyrille Violle Jens-Christian Svenning

Macro-scale species richness studies often use museum specimens as their main source of information. However, such datasets are often strongly biased due to variation in sampling effort in space and time. These biases may strongly affect diversity estimates and may, thereby, obstruct solid inference on the underlying diversity drivers, as well as mislead conservation prioritization. In recent y...

Journal: :Agrobìologìâ 2022

The types of plant diversity on the territory Radomyshl Forestry in areas with different forest vegetation conditions were investigated. 21 species belonging to 15 families and 18 genera have been identified. main are determined (Pinus sylvestris-Vaccinium vitisidaea+V. myrtillus-Cladonia spp.+ Pleurozium; Pinus sylvestris-Calluna vulgaris-Pleurozium+ Cladonia ssp.; myrtillus-Pleurozium; sylves...

Physiographic factors, due to their special role in determining some climatic and edaphic parameters, always influence the diversity and richness of plant species. Due to the importance of Arasbaran vegetation area, the present study was conducted to investigate the biodiversity of woody species of Kalaleh yew habitat in relation to physiographic factors. For this purpose, 62 plots of 4 square ...

ژورنال: مرتع 2020
Erfanzadeh, Reza, Ghelichnia, Hasan, Hadinajad, Mahboobeh,

Soil seed bank can facilitate natural regeneration of rangeland ecosystems. This bank is usually influenced by local plant species. This study was conducted to investigate the effect of canopy cover of three shrubs (Amygdalus scoparia, Daphne mezereum and Ebenus stellata) on the diversity and richness of soil seed bank under their canopies in Chenarnaz rangelands, Khatam city, Yazd province. Fi...

Determination of factors affecting on species distribution and diversity, especially in desert areas is the most important factor in rangeland ecosystems management for encountering biological stress. In order to evaluate the effect of physiographic factors on plant biodiversity in natural ecosystems of Kakhk Gonabad, this research was conducted in spring 2014. First, by overlaying four maps of...

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