نتایج جستجو برای: ecological phenomena
تعداد نتایج: 218427 فیلتر نتایج به سال:
the notion of sustainable development has rapidly gained considerable attention since the lastdecades of the twentieth century. it has become a locus for global paradigm shift on environment and development issues particularly after rio conference in 1992. the comparative analysis of agenda 21 and major un documents, mdg, and rio+20 as well as some major sources are made to provide a context fo...
© The Ecological Society of America www.frontiersinecology.org I this paper, we present a conceptual framework for investigating ecological patterns and processes at regional to continental scales. Ecological phenomena operate across a range of scales (Figure 1), but the development of ecological theory of regions to continents lags behind that of finer scales. Better understanding of broad sca...
In the framework of Landscape Ecology, we propose an integrated approach that combines an ecological graph model for the analysis of the relationship between spatial pattern and ecological flows and a mathematical model, based on a system of two nonlinear differential equations that studies landscape stability and bifurcation phenomena. A case study of the district of Cremona (Italy) is perform...
Russell and Blackburn’s [1] call to action against ‘invasive species denialism’ appears tobe invasionbiology’sdesperate last stand. Invasion biologists’ insistence that species introductions constitute a unified ecological crisis is losing support from both the scientific community and the informed public. It is being replaced by a more equivocal notion of ecological novelty, which can accommod...
This paper deals with the numerical solution of a class of reaction diffusion equations arises from ecological phenomena. When two species are introduced into unoccupied habitat, they can spread across the environment as two travelling waves with the wave of the faster reproducer moving ahead of the slower.The mathematical modelling of invasions of species in more complex settings that include ...
The ubiquity of scale-free patterns in ecological systems has raised the possibility that these systems operate near criticality. Critical phenomena (CP) require the tuning of parameters and typically exhibit a narrow scaling region in which power laws hold. Here we show that an individual-based predator-prey model exhibits scaling properties similar to CP, generated by a percolation-like trans...
In order to develop theory any community of scientists must agree as to what constitutes its phenomena of interest. A distinction is made between phenomena of interest and exemplars. The concept "prevention" is viewed as an exemplar, whereas the concept "empowerment" is suggested as a leading candidate for the title "phenomena of interest" to Community Psychology. The ecological nature of empow...
Geophysical and ecological dynamics within lakes of the McMurdo Dry Valleys, Antarctica, are controlled by the presence of permanent ice covers. Despite the importance of the permanent ice cover, there have been no studies that have examined specific couplings between changes in the geophysical properties of the ice covers and dynamic ecological processes within the underlying water column. Her...
Resilience studies build on the notion that phenomena in the real world should be understood as dynamic social ecological systems. However, the scholarly community may not be fully aware that Social Ecology, as a conceptual framework, has a long intellectual history, nor fully cognizant of its foundational theory. In the article, the authors trace the intellectual roots and core principles of S...
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