نتایج جستجو برای: mean of richness margalef
تعداد نتایج: 21177290 فیلتر نتایج به سال:
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 ...
Aim Relationships between range size and species richness are contentious, yet they are key to testing the various hypotheses that attempt to explain latitudinal diversity gradients. Our goal is to utilize the largest data set yet compiled for New World woody plant biogeography to describe and assess these relationships between species richness and range size. Location North and South America. ...
the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...
The aim of this investigation was to assess the differences in terms α-diversity, species composition and trophic structure between peracarid assemblages inhabiting artificial hard substrates those present on natural ones at two sites Western Mediterranean Sea. In each one, samples were collected from substrates, extracted peracarids identified level. Each sample characterised by its Total Abun...
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...
The understorey is one type of tropical forest vegetation that contributes to the complexity structure. habitat closely related condition vegetation. This study aims determine structure and composition support ecological function in Malagembol Block, Mount Tilu Nature Reserve. sample collection was carried out using plot method. A total three main plots measuring 10×100 m2 were divided into ten...
city parks play an important role in the welfare of metropolitan people. higher species richness of birds can be considered as a reflection of the health of the park and may satisfy visitors to a higher extent being in a more natural environment. we studied the influence of area and shape of city parks on bird species richness and diversity. 13 parks from among the 35 main city parks in isfahan...
Aim: Regarding the importance of language in communication and the key role of hearing in it, speech quality assessment in determining the ability of an individual is an suitable index. The purpose of this study was to analyze the speech quality of MLU, lexical richness, the number of content words and function words in 6-4 years low birth bringing Deaf cochlear implant in comparison with peers...
چـکـیده مقدمه: در طول دو دهه ی اخیر بخش قابل توجهی از تمرکز سازمان ها بر روش های مدیریت هزینه ها (cost management)، و رشد درآمدها (revenue growth) معطوف گشته است. توجه صرف به مدیریت هزینه یا رشد درآمد به مفهوم از دست دادن فرصت بهره مندی از دیگری است. به این ترتیب چیزی که لازم به نظر می رسد ایجاد توازن و هماهنگی بین این دو می باشد؛ اما چگونه این توازن اتفاق می افتد؟ ارزیـابی ارزش هر مشتری، تخ...
Question: What are the qualitative and quantitative long-term changes in the vascular epiphyte assemblage on a particular host tree species? Location: Lowland rain forest of the San Lorenzo Crane Plot, Republic of Panama. Methods: We followed the fate of the vascular epiphyte assemblage on 99 individuals of the palm Socratea exorrhiza by three censuses over the course of five years. Results: Th...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید