نتایج جستجو برای: shannon wiener
تعداد نتایج: 17177 فیلتر نتایج به سال:
Population dynamics indices of parasites infected on cultured ornamental fishes according to the climatic changes in kurunagala district,Sri Lanka were estimated.Sample of gold fishes and koi carps which were harvested from mud ponds in ornamental fish breeding and traning center was examined for ecto parasites. Four population indices were calculated for each abundant parasite species and dive...
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...
In present study, besides investigating benthic communities and their demographics in Choghakhor wetland, the water quality has been evaluated and classified. Then, 10 stations were selected and sampling of benthos was done every 45 days since April 2010 to March 2011, with 3 replications at each station. Samples were obtained by Ekman grab Sampler (surface 400 cm2). The collected samples were ...
Objective: Empirical evidence on the potential of area exclosure in restoration severely degraded lands is crucially important. Thus, a study was conducted to examine influence age vegetation structure, diversity, and biomass carbon stock central dry lowland Ethiopia. Methods: Exclosures 5, 15, >20 years old, adjacent open grazing land were selected. Data collected using 20 × m sampling quad...
This study was carried out to compare the biodiversity parameters of epigean insect species in 3 different regions with geographical conditions. Tefenni Plain, Beyköy (Abdülmelik) Plain and Çaylı Mountain Village, which are located at altitudes, were chosen as area. Pitfall traps placed agro-ecosystems anise fennel each region caught pitfall checked weekly. A total 2086 individuals belonging 11...
The purpose of this study was to determine the diversity Crustacea Class Diversity Subclass (Malacostraca) in mangrove ecosystem Padadita Beach, East Sumba Regency. research method used quadratic transect and analyzed using a quantitative descriptive approach with index formula Shannon-Wiener. This sampling technique, namely purposive plot size 2 x meters placed perpendicular depth 200 27 plots...
Pantai Kelapa Panyuran memiliki sumber daya alam yang melimpah, salah satunya adalah makroalga. Makroalga merupakan biologi kelautan berperan penting dalam ekosistem perairan. Penelitian ini bertujuan untuk mendeskripsikan keanekaragaman makroalga di Kelapa, sehingga diharapkan dapat memberikan gambaran tentang Kelapa. Metode digunakan observasi, penelusuran sepanjang jalur pantai, dan dokument...
در تحقیق حاضر، برآورد گوشه اکولوژیک گونه زالزالک، تاثیر عوامل اقلیمی و توپوگرافی بر تراکم پایه های زالزالک و همپوشانی اکولوژیک گونه زالزالک با گونه های درختی همراه در مناطق جنگلی استان چهارمحال و بختیاری مورد بررسی قرار گرفت. اندازه گیری گوشه اکولوژیک و دامنه گسترش گونه زالزالک با استفاده از شاخص های levins (1968)، shannon-wiener (1971)، smith (1982) و hurlberts (1978) اندازه گیری شد. شاخص های ...
Preservation and increase of biodiversity is one of the main components to achieve sustainability in agricultural systems. In this study, biodiversity evaluation indexes were used to evaluate and compare agrobiodiversity of vegetable crop systems among all provinces of Iran. In this study the biodiversity evaluation indexes included Shannon-Wiener, Simpson and Evenness. In order to compare the ...
La investigación se realizó en la cuenca media y baja del río Cunas, de abril 2010 a marzo 2011, con el objetivo evaluar estado actual biodiversidad las comunidades vegetales ecosistema acuático, mediante indicadores estructura diversidad. El muestreo flora terrestre los métodos líneas Canfield área. evaluación diversidad vegetal, base vegetales. estructura, determinó índice valor importancia d...
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