نتایج جستجو برای: biodiversity

تعداد نتایج: 36786  

2013
Jianguo Liu

Global biodiversity continues along a trajectory of decline despite enormous conservation efforts (Rands et al., 2010). This is also true in China, one of the most biodiversity-rich countries in the world (Liu and Raven, 2010; Ministry of Environmental Protection of China, 2010a). To fundamentally change this trajectory, it is essential to understand complex interactions among various forces af...

2007
Brendan Fisher

Article history: Received 13 October 2005 Received in revised form 17 April 2006 Accepted 26 May 2006 Available online 17 August 2006 In an effort to prioritize conservation efforts, scientists have developed the concept of biodiversity hotspots. Since most hotspots occur in countries where poverty is widespread, the success of conservation efforts depends upon the recognition that poverty can ...

Journal: :Remote Sensing 2011
Laerte Guimarães Ferreira Timothy J. Urban Amy Neuenschawander Fernando Moreira De Araújo

This paper focuses on the Ice, Cloud and land Elevation Satellite (ICESat) Geoscience Laser Altimeter System (GLAS) data availability over the 2 million km Cerrado, the Brazilian central savanna biome and one of the world’s biodiversity hotspots. Overall, about 2.5 million laser shots, distributed along the seven years of ICESat operation (2003–2009) and comprising three major seasonal domains,...

2009
D. Rosauer S. Ferrier G. Manion S. Laffan K. Williams

1.1 The biodiversity mapping problem Mapping the distribution of elements of biodiversity is essential to any planned approach for allocating resources to conservation, as well as to understand macro scale evolutionary processes. For well studied areas, ‘point’ data from observed locations of each species may provide sufficient information. For well studied species, a range of modelling techniq...

2011
Ximo Mengual Kumar Ghorpade

The flower fly genus Eosphaerophoria is revised. Eight new species are described (adornata sp. n. Mengual, bifida sp. n. Mengual, brunettii sp. n. Ghorpade, hermosa sp. n. Mengual, luteofasciata sp. n. Mengual, nigrovittata sp. n. Mengual, symmetrica sp. n. Mengual, and vietnamensis sp. n. Mengual), and an identification key is provided. Redescriptions, illustrations, synonymies, diagnoses and ...

Journal: :پژوهش های تولید گیاهی 0
بهنام کامکار عضو هیات علمی دانشگاه ناصر باقرانی ترشیز مرکز تحقیقات کشاورزی و منابع طبیعی استان گلستان. گرگان سید اسماعیل رضوی گروه گیاهپزشکی- دانشگاه علوم کشاورزی و منابع طبیعی گرگان

this study was aimed to assess wheat-grown fields health in gharessoo basin, golestan province, iran, using 79 fields in 8 villages in 2010. the samples were taken by quadrates. the number and the type of weeds were recorded at genera and species levels. in parallel, management data were recorded by questionnaire. species richness was defined as species number and shannon-wiener index, simpson’...

Journal: :پژوهش های زراعی ایران 0
علیرضا کوچکی مهدی نصیری محلاتی مریم جهانی کندری زینت برومند رضازاده

in order to investigate biodiversity of industrial crop in iran, an investigation was made based on the statistical data available on acreage and production of this crop in the country. cultivated area of industrial crop from 29 provinces were analyzed and shannon biodiversity index was calculated. the highest biodiversity index compare to the total crop species was observed in golestan, semnan...

Journal: :Revue scientifique et technique 2010
S Morand

This paper examines the way in which biodiversity has been incorporated into the agenda of many international organisations, including non-governmental organisations, and international programmes. Biodiversity has been defined by the Convention on Biological Diversity but is also widely discussed in relation to genetic resources, biodiversity hotspots and ecosystem services. The author identifi...

Journal: :international journal of environmental research 2010
e.e. ezebilo

this paper discusses the study of community’s preferences for biodiversity conservation management institution which may motivate them to support conservation efforts in the okwangwo division of the cross river national park, nigeria. the empirical data was generated from personal interviews and factors influencing the respondents’ choice were examined with the aid of multinomial logit mode...

Journal: :Current opinion in environmental sustainability 2012
Anne Larigauderie Anne-Hélène Prieur-Richard Georgina M Mace Mark Lonsdale Harold A Mooney Lijbert Brussaard David Cooper Wolfgang Cramer Peter Daszak Sandra Díaz Anantha Duraiappah Thomas Elmqvist Daniel P Faith Louise E Jackson Cornelia Krug Paul W Leadley Philippe Le Prestre Hiroyuki Matsuda Margaret Palmer Charles Perrings Mirjam Pulleman Belinda Reyers Eugene A Rosa Robert J Scholes Eva Spehn Bl Turner Tetsukazu Yahara

DIVERSITAS, the international programme on biodiversity science, is releasing a strategic vision presenting scientific challenges for the next decade of research on biodiversity and ecosystem services: "Biodiversity and Ecosystem Services Science for a Sustainable Planet". This new vision is a response of the biodiversity and ecosystem services scientific community to the accelerating loss of t...

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