نتایج جستجو برای: biodiversity loss

تعداد نتایج: 478085  

2007
David Pimentel Christa Wilson Christine McCullum Rachel Huang Quynh Tran Tamara Saltman Barbara Cliff Paulette Dwen Jessica Flack

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2011
József Geml Ina Timling Clare H. Robinson Niall Lennon H. Chad Nusbaum Christian Brochmann Machiel E. Noordeloos D. Lee Taylor

National Herbarium of the Netherlands, Netherlands Centre for Biodiversity Naturalis, Leiden University, PO Box 9514, Einsteinweg 2, 2300 RA Leiden, The Netherlands, Institute of Arctic Biology, University of Alaska Fairbanks, PO Box 757000, Fairbanks, AK 99775-7000, USA, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Williamson Building, Oxford Road, Man...

Journal: :Ecology letters 2015
Joscha Beninde Michael Veith Axel Hochkirch

Understanding varying levels of biodiversity within cities is pivotal to protect it in the face of global urbanisation. In the early stages of urban ecology studies on intra-urban biodiversity focused on the urban-rural gradient, representing a broad generalisation of features of the urban landscape. Increasingly, studies classify the urban landscape in more detail, quantifying separately the e...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2006
Kamaljit S Bawa

Contemporary challenges in conservation biology seem more formidable than 20 years ago, when the founding of the journal Conservation Biology more or less coincided with the emergence of conservation biology as a distinct scientific discipline. Several years ago, David Ehrenfeld, the founding editor of the journal, and one of the cofounders of the discipline, likened conservation biologists to ...

2013
Stephan Barthel Carole L. Crumley

There is urgent need to both reduce the rate of biodiversity loss caused by industrialized agriculture and feed more people. The aim of this paper is to highlight the role of places that harbor traditional ecological knowledge, artifacts, and methods when preserving biodiversity and ecosystem services in landscapes of food production. We use three examples in Europe of biocultural refugia, defi...

2009
Michael Kollmair Ghana Gurung Marc Hufty Eva Ludi Daniel Maselli

Protected areas in mountains are regularly in the focus of international efforts to conserve the environment and enable sustainable development. The following article analyses the current extend of protection in mountainous versus non-mountainous areas, sheds light on the rationales behind the establishment of mountain protected areas, and proposes directions for future endeavours in protecting...

2011
Li An Marc Linderman Guangming He Zhiyun Ouyang Jianguo Liu

Human population has exerted enormous impacts on biodiversity, even in areas with “biodiversity hotspots” identified by Myers et al. (2000). For instance, the population density in 1995 and the population growth rate between 1995 and 2000 in biodiversity hotspots were substantially higher than world averages, suggesting a high risk of habitat degradation and species extinction (Cincotta et al. ...

Journal: :Current Biology 2003
Nigel Williams

One group of insects highlight some of the potential economic damage that loss of biodiversity may entail for the future of human food crops.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده فنی و مهندسی 1391

در این پروژه فیلترهای مایکرواستریپ جدیدی برای به‎‎دست آوردن اندازه‎ی فشرده، پاسخ تیز و نیز باند قطع عریض ارائه‎ شده است که از جمله‎ی آن ها فیلتری است که از سری شدن یک رزوناتور شاخه‎ای منتهی به نیم‎دایره و یک تکه‎ی‎ شعاعی بهبود یافته به عنوان تضعیف کننده‎ی هارمونیک، تشکیل شده است. فرکانس قطع -3 db این فیلتر در 1.54 ghz قرار دارد. باند‎ گذر این فیلتر تنها 0.26 ghz است که شامل محدوده‎ی فرکانسی 1.5...

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