نتایج جستجو برای: ecological zone

تعداد نتایج: 208778  

پایان نامه :0 1371

in order to examine the ecological conditions and characteristics of fraxinus excelsior l. in the northern forests of iran 6 main areas as well as some miscellaneous ones , have been selected in the region respectively in : lomir2, shafaroud , park - e-noor , ahlam , alandan and noor.

2012
Alexander Strezov

The implementation of advanced methods and technology in the field of marine ecosystems studies is important to assess the impact of pollutants on marine ecosystems and biodiversity and biota interactions, including reliable study of radionuclide and heavy metal content in soils, sediments and algae. Creation of data bases for long term environmental management of pollution; evaluation of ecolo...

Journal: :The New phytologist 2013
Jill A Hamilton Christian Lexer Sally N Aitken

Differential patterns of introgression between species across ecological gradients provide a fine-scale depiction of extrinsic and intrinsic factors that contribute to the maintenance of species barriers and adaptation across heterogeneous environments. Introgression was examined for 721 individuals collected from the ecological transition zone spanning maritime to continental climates within t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم 1395

چکیده: در این پژوهش سازند گورپی در برش تاقدیس کوه سیاه در شمال شهرستان دهدشت ( یاسوج، زاگرس) به منظور مطالعات چینه نگاری زیستی و چینه نگاری سکانسی مورد بررسی قرار گرفت. سازند گورپی در برش مورد نظر به طور پیوسته بر روی سازند ایلام قرار گرفته است و مرز بالایی آن با سازند پابده به طور ناپیوسته و هم شیب دیده می شود. نهشته های سازند گورپی در برش تاقدیس کوه سیاه 212 متر ضخامت داشته و شامل 13 واحد س...

2008
O. C. A. Ahmedou A. E. Osman K. Hattori

To evaluate the state of ecosystems in Mauritania, rainfall time series and a GIMMSNDVI (global inventory modeling and mapping study-normalized difference vegetation index) data set were used for analysis of rainfall and NDVI trends and their relationships in different ecological zones. Linear regression analysis and the non-parametric Mann-Kendall test were applied to detect NDVI and rainfall ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Kyle G Dexter John W Terborgh Clifford W Cunningham

We present a unique perspective on the role of historical processes in community assembly by synthesizing analyses of species turnover among communities with environmental data and independent, population genetic-derived estimates of among-community dispersal. We sampled floodplain and terra firme communities of the diverse tree genus Inga (Fabaceae) across a 250-km transect in Amazonian Peru a...

2000

Discusses the interaction between socio-economic systems and their natural environment, by examining the indicators of sustainable development. Areas covered by the operationalization of sustainable development indicators; Details on the global nature of environmental problems; Important strategy of the operationalization of sustainable development; Link between economic data and ecological ind...

2013
Siegfried L Krauss Elizabeth A Sinclair John D Bussell Richard J Hobbs

An increasingly important practical application of the analysis of spatial genetic structure within plant species is to help define the extent of local provenance seed collection zones that minimize negative impacts in ecological restoration programs. Here, we derive seed sourcing guidelines from a novel range-wide assessment of spatial genetic structure of 24 populations of Banksia menziesii (...

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