نتایج جستجو برای: ecosystem

تعداد نتایج: 83322  

2013
Wu Yang Thomas Dietz Wei Liu Junyan Luo Jianguo Liu

The Millennium Ecosystem Assessment (MA) estimated that two thirds of ecosystem services on the earth have degraded or are in decline due to the unprecedented scale of human activities during recent decades. These changes will have tremendous consequences for human well-being, and offer both risks and opportunities for a wide range of stakeholders. Yet these risks and opportunities have not bee...

Journal: :international journal of molecular and clinical microbiology 0
periasamy dhevagi tamil nadu agricultural university

l glutaminase, a therapeutic enzyme obtained from marine actinomycetes gains importance because of their adaptability to varied environmental factors. an experimental study was carried out to isolate the l glutaminase producing actinomycetes from the marine sediment of thoothukudi. marine sediment sample was collected from six different locations of the thoothukudi coastal ecosystem, enriched w...

2004
Luuk K.A. Dorren Frédéric Berger Anton C. Imeson Bernhard Maier Freddy Rey

Ecosystem management of protection forests aims at maintaining forests near a state during which effective protection is secured. As the evolution of a dynamic forest ecosystem cannot be stopped, silvicultural measures are required which aim at maintaining both the ecosystem integrity and the protective function of mountain forests. Ecosystem integrity is defined as the system’s capacity to mai...

2009
Steven A. Murawski John H. Steele Phillip Taylor Michael J. Fogarty Michael P. Sissenwine Michael Ford Cynthia Suchman

Effective marine ecosystem-based management (EBM) requires understanding the key processes and relationships controlling the aspects of biodiversity, productivity, and resilience to perturbations. Unfortunately, the scales, complexity, and non-linear dynamics that characterize marine ecosystems often confound managing for these properties. Nevertheless, scientifically derived decisionsupport to...

2018
Xiaolin Zhang Penghui Zhai Jianhui Huang Xiang Zhao Kuanhu Dong

Water use efficiency (WUE) is an important indicator of ecosystem functioning but how ecosystem WUE responds to climate change including precipitation and nitrogen (N) deposition increases is still unknown. To investigate such responses, an experiment with a randomized block design with water (spring snowfall or summer water addition) and nitrogen addition was conducted in a temperate steppe of...

2009
Minoru Kanaiwa Takuya Inoue Atsuya Yamamoto

Because natural organisms are a part of the factors constituting the ecosystem for each organism, it is important to clarify both physical and biological exploitable factors to determine species compositions which exist in that ecosystem. The variation in factors which constitute an ecosystem makes up the variation in species composition. At the same time, each species will interact and will ma...

2010
Sameer Honwad Cindy Hmelo-Silver Rebecca Jordan Catherine Eberbach Steven Gray Suparna Sinha Swaroop Vattam

Learning about ecosystems is challenging because, like any complex system, they are simultaneously multidimensional and dynamic. Often, learners engage only with the visible components of an ecosystem and draw either single or linear causal connections between components. In this study, we explored how using a Structure-Behavior-Function framework supported middle school students’ conceptual an...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Stephen Polasky David J Lewis Andrew J Plantinga Erik Nelson

Many ecosystem services are public goods whose provision depends on the spatial pattern of land use. The pattern of land use is often determined by the decisions of multiple private landowners. Increasing the provision of ecosystem services, though beneficial for society as a whole, may be costly to private landowners. A regulator interested in providing incentives to landowners for increased p...

2013
Konstantinos Manikas Klaus Marius Hansen

The health of a software ecosystem is an indication of how well the ecosystem is functioning. The measurement of health can point to issues that need to be addressed in the ecosystem and areas for the ecosystem to improve. However, the software ecosystem field lacks an applicable way to measure and evaluate health. In this work, we review the literature related to the concept of software ecosys...

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Background: Identification of students’ ethics towards environment as a reference, ‎knowledgeable and effective group of society, can be an important stage in the ‎environmental policy making and planning of national higher education. Thus, the purpose ‎of this study was to investigate the relationship among environmental ethics dimensions ‎in agricultural students of university of Mohaghegh Ar...

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