نتایج جستجو برای: scale ecological research at various spatial

تعداد نتایج: 5581658  

2014
Shaopeng Wang Michel Loreau

[email protected] Abstract The past two decades have seen great progress in understanding the mechanisms of ecosystem stability in local ecological systems. There is, however, an urgent need to extend existing knowledge to larger spatial scales to match the scale of management and conservation. Here, we develop a general theoretical framework to study the stability and variability of ec...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زبانهای خارجی 1392

to teach english adequately, qualified teachers are needed. unfortunately, there are still teachers who are teaching english without an academic degree in tefl. it is necessary for teachers to have a major in english to have subject knowledge, but it is not sufficient. teachers need to have an understanding of the social, cultural, moral, ethical, and pedagogical issues of education and practic...

Journal: :iranian journal of public health 0
hamidreza tabatabaee jafar hassan zadeh fereshteh younesnia mohsen ali akbarpoor sima javanmard behnam honarvar

background: the present study aimed to identify the spatial distribution of tuberculosis and determine the tb control program parameters in the regions supervised by shiraz university of medical sciences in 2006-2012. methods: the present ecological study was performed on 1797 tb patients in shiraz university in 2006-2012 which were recorded by health centers using tb register software. the stu...

2013
Karen Anderson Kevin J Gaston

www.frontiersinecology.org © The Ecological Society of America R techniques have transformed ecological research by providing both spatial and temporal perspectives on ecological phenomena that would otherwise be difficult to study (eg Kerr and Ostrovsky 2003; Running et al. 2004; Vierling et al. 2008). In particular, a strong focus has been placed on the use of data obtained from spaceborne re...

Journal: :Annals of GIS 2000
Jianguo Wu Ye Qi

Scale and Scaling Scale is an essential concept in both natural and social sciences, and has been defined in several different ways (Gibson et al. [4], van Gardingen [19], Peterson and Parker [16], Marceau [12], Withers and Meentemeyer [21], Jenerette and Wu [6]). In landscape ecology, scale refers primarily to grain (or resolution) and extent in space or/and time. Scale may be absolute (measur...

2017
E. Maggi L. Rindi M. Dal Bello D. Fontanini A. Capocchi L. Bongiorni L. Benedetti-Cecchi

Knowledge of spatio-temporal variability of assemblages is the first step in identifying key factors affecting the abundance and distribution of organisms. Despite a long history of ecological studies on rocky intertidal habitats, there is still a lack of basic knowledge about the microphytobenthic components. We investigated the spatio-temporal variability of microphytobenthos in the northwest...

Journal: :Ecological Informatics 2006
Julian D. Olden N. LeRoy Poff Brian P. Bledsoe

Article history: Received 15 February 2005 Received in revised form 29 July 2005 Accepted 9 August 2005 The field of ecoinformatics is concerned with gaining a greater understanding of complex ecological systems. Many ecoinformatic tools, including artificial neural networks (ANNs), can shed important insights into the complexities of ecological data through pattern recognition and prediction; ...

Journal: :Ecological Informatics 2010
Jason W. Karl Brian A. Maurer

a r t i c l e i n f o A significant challenge in ecological studies has been defining scales of observation that correspond to the relevant ecological scales for organisms or processes of interest. Remote sensing has become commonplace in ecological studies and management, but the default resolution of imagery often used in studies is an arbitrary scale of observation. Segmentation of images in...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Hélène de Paoli Tjisse van der Heide Aniek van den Berg Brian R Silliman Peter M J Herman Johan van de Koppel

Self-organized spatial patterns occur in many terrestrial, aquatic, and marine ecosystems. Theoretical models and observational studies suggest self-organization, the formation of patterns due to ecological interactions, is critical for enhanced ecosystem resilience. However, experimental tests of this cross-ecosystem theory are lacking. In this study, we experimentally test the hypothesis that...

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