نتایج جستجو برای: ecosystem

تعداد نتایج: 83322  

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2012
Paolo D'Odorico Abinash Bhattachan

Research on ecosystem and societal response to global environmental change typically considers the effects of shifts in mean climate conditions. There is, however, some evidence of ongoing changes also in the variance of hydrologic and climate fluctuations. A relatively high interannual variability is a distinctive feature of the hydrologic regime of dryland regions, particularly at the desert ...

2016
Matthias Schröter Christian Albert Alexandra Marques Wolke Tobon Sandra Lavorel Joachim Maes Claire Brown Stefan Klotz Aletta Bonn

National ecosystem assessments form an essential knowledge base for safeguarding biodiversity and ecosystem services. We analyze eight European (sub-)national ecosystem assessments (Portugal, United Kingdom, Spain, Norway, Flanders, Netherlands, Finland, and Germany) and compare their objectives, political context, methods, and operationalization. We observed remarkable differences in breadth o...

The purpose of this paper was to analyze the impact of the university on regional development in Iran in the theoretical framework of the knowledge-based development ecosystem. This research was conducted with a descriptive approach, which is a practical and quantitative method. For the empirical analysis of ecosystem of the knowledge-based development and university assistance for regional dev...

Journal: :Current Biology 2005

1997
Richard W. Haynes Russell T. Graham Thomas M. Quigley Tom Quigley Mark Jensen

A framework for ecosystem management is proposed. This framework assumes the purpose of ecosystem management is to maintain the integrity of ecosystems over time and space. It is based on four ecosystem principles: ecosystems are dynamic, can be viewed as hierarchies with temporal and spatial dimensions, have limits, and are relatively unpredictable. This approach recognizes that people are par...

2012
P. H. TEMPLER L. M. CHRISTENSON J. E. COMPTON H. D. CROOK W. S. CURRIE C. J. CURTIS D. B. DAIL C. M. D’ANTONIO B. A. EMMETT H. E. EPSTEIN C. L. GOODALE P. GUNDERSEN S. E. HOBBIE K. HOLLAND D. U. HOOPER B. A. HUNGATE S. LAMONTAGNE K. J. NADELHOFFER C. W. OSENBERG S. S. PERAKIS D. R. ZAK

Effects of anthropogenic nitrogen (N) deposition and the ability of terrestrial ecosystems to store carbon (C) depend in part on the amount of N retained in the system and its partitioning among plant and soil pools. We conducted a meta-analysis of studies at 48 sites across four continents that used enriched N isotope tracers in order to synthesize information about total ecosystem N retention...

2008
THORSTEN WIEGAND JAVIER NAVES MARTÍN F. GARBULSKY

Many animal species have developed specific evolutionary adaptations to survive prolonged periods of low energy availability that characterize seasonal environments. The seasonal course of primary production, a major aspect of ecosystem functioning, should therefore be an important factor determining the habitat quality of such species. We tested this hypothesis by analyzing the relationship be...

2016
Wen-Chun Tsai

Business ecosystem perspective is a systematic thinking for business development. It has the form of dynamic and sophisticated relationships of participants or the intentional communities that are established based on the same business, economic purposes. Due to the fast-changing environment, business ecosystem perspective encourages co-evolution and value sharing among the participants to capt...

2009
Richard R. Kirby Gregory Beaugrand

Ecosystems can alternate suddenly between contrasting persistent states due to internal processes or external drivers. It is important to understand the mechanisms by which these shifts occur, especially in exploited ecosystems. There have been several abrupt marine ecosystem shifts attributed either to fishing, recent climate change or a combination of these two drivers. We show that temperatu...

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