نتایج جستجو برای: غنای کل total richness
تعداد نتایج: 878333 فیلتر نتایج به سال:
هدف: هدف تحقیق، تدوین الگوی پیاده‌سازی راهبردهای اداره کل ورزش و جوانان استان گلستان در حوزه‌ی سالمندان با روش کارت امتیازی متوازن می‌باشد.طراحی/ روش‌شناسی/ رویکرد: پژوهش کاربردی به شیوه‌ی توصیفی است نوع داده‌ها آمیخته می‌باشد. مفهومی تحقیق بر اساس مدل کاپلان نورتن جامعه‌ی آماری بخش کمّی مدیران کل، مسئولین هیأت ورزش‌های همگانی اساتید دانشگاه بالغ 44 نفر بودند نمونه‌گیری تمام‌شمار انجام...
The economic, physiological and immunological costs of endo-parasitism are documented to be higher in poultry with greater parasite intensities and diversity. The current study was undertaken to determine the effects of helminth burden in domestic guinea fowls at quantified natural infestation levels on body condition, haematological profile and spleen morphometrics. We hypothesized that the sp...
Data collected from 20 major river basins between 1993 and 1995 as part of the US Geological Survey’s (USGS) National Water-Quality Assessment (NAWQA) Program were analyzed to assess patterns in introduced and native fish species richness and abundance relative to watershed characteristics and stream physicochemistry. Sites (N = 157) were divided into three regions-northeast, southeast, and wes...
The geographic distribution of species is the typical metric for identifying priority areas for conservation. Since most biodiversity remains poorly studied, a subset of charismatic species, such as primates, often stand as surrogates for total biodiversity. A central question is therefore, how effectively do primates predict the pooled species richness of other mammalian taxa? We used lemurs a...
Understanding the biotic and abiotic factors that influence the susceptibility of a community to invasion is beneficial for the prediction and management of invasive species and the conservation of native biodiversity. However, the relationships between factors and invasibility of a community have not been fully confirmed, and the factors most associated with the susceptibility of a community t...
UNLABELLED Subseafloor sediment hosts a large, taxonomically rich, and metabolically diverse microbial ecosystem. However, the factors that control microbial diversity in subseafloor sediment have rarely been explored. Here, we show that bacterial richness varies with organic degradation rate and sediment age. At three open-ocean sites (in the Bering Sea and equatorial Pacific) and one continen...
The Hezar-Masjed Mountain range is one of the main highlands of the northeasten Iran. The vegetation of its upper elevations has been poorly studied. This study aimed to compare the plant biodiversity of different aspects of the Hezar-Masjed Summit. A total number of 139 random 1m2 plots were recorded from different aspects of the study area. In each plot, the abundance and canopy cover percent...
In this study, different indices of vegetation cover variations and different physicochemical properties of soil in three treatments of flood spreading, enclosure and grazing (control) were investigated and compared in in the region of Peshert in Mazandaran province. In order to measure different soil characteristics, 18 soil samples (six withdrawals at any treatment) from a depth of zero to 30...
To test the hypotheses that fruit-feeding nymphalid butterflies are randomly distributed in space and time, a community of fruit-feeding nymphalid butterflies was sampled at monthly intervals for one year by trapping 6690 individuals of 130 species in the canopy and understory of four forest habitats: primary, higraded, secondary, and edge. The overall species abundance distribution was well de...
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