نتایج جستجو برای: rare species
تعداد نتایج: 777083 فیلتر نتایج به سال:
a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...
The fact that temperate grasslands often contain upwards of 30 vascular plant species per m(2) yet these species seem to have relatively similar life histories and resource requirements has made explaining species coexistence in these communities a major focus of research. While the reduction of competition by disturbance has been a popular explanation for species coexistence, in tallgrass prai...
The role of diversity in the maintenance of ecosystems has been studied widely in the past decade. By correlating richness and diversity with basic ecosystem processes, these investigations lend support to the hypothesis that species diversity significantly influences ecosystem functioning and, in turn, provide support for the conservation of biodiversity. Nonetheless, the majority of these inv...
Regarding high economic and conservative values of Zagros forests, and livelihood dependency of local people these recourses, determination of sites with higher conservation index can help us to maintain biodiversity of these forests more efficiently. Therefore, 49 plots with 450 m2 in area accompanied by 1, 10 and 45 m2 subplots were taken as systematic random design in research forests of Yas...
butterflies of the inani reserve forest were studied between may 2014 and may 2015. one hundred twenty five species of butterflies belonging to 84 genera and six families (hesperiidae, papilionidae, pieridae, lycaenidae, riodinidae and nymphalidae) were recorded during this study. the highest number of species comprised family nymphalidae (38 species, 30.4%) followed by lycaenidae (35 species, ...
based on the latest records of typhlops vermicularis merrem, 1820 from iran, this species is distributed in the northern and southern regions of the country. in this study, new records of typhlops vermicularis are presented and it is shown that distribution range of this species is extended towards the eastern and western iran, and according to the new distribution map, it can be assumed that t...
In this paper, five species of the agaric fungi viz., Entoloma griseoluridum, E. niphoides, Limacella ochraceolutea, Mycena clavicularisand M. acicula belonging to family Amanitaceae, Entolomataceae and Mycenaceae, are reported for the first time for Iranian mycobiota. Limacella ochraceolutea is the first species of fungi belonging to genus Limacella in Iran.Because L. ochraceolutea is a rare s...
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