نتایج جستجو برای: scale ecological research at various spatial

تعداد نتایج: 5581658  

Ahmadreza yavari Elham yousefi Esmail Salehi, Seyed Hamid Zahiri

With current new urban developments, no balance can be found between green spaces and open areas present within urban networks and natural land patterns since urban networks are dominating ecological networks. Accordingly, one of the major tasks of urban and regional planners is the optimal land use allocation to urban green spaces. Therefore, to achieve this goal in this research, locations of...

2017
Rafael González-López Mario Giampietro

We propose and illustrate a multi-scale integrated analysis of societal and ecosystem metabolism (MuSIASEM) as a tool to bring nexus thinking into practice. MuSIASEM studies the relations over the structural and functional components of social-ecological systems that determine the entanglement of water, energy, and food flows in a complex metabolic pattern. MuSIASEM simultaneously considers var...

2013
Yu Liang Hong S. He Jacob S. Fraser ZhiWei Wu

Subjective decisions of thematic and spatial resolutions in characterizing environmental heterogeneity may affect the characterizations of spatial pattern and the simulation of occurrence and rate of ecological processes, and in turn, model-based tree species distribution. Thus, this study quantified the importance of thematic and spatial resolutions, and their interaction in predictions of tre...

2014
Cynthia Gidoin Régis Babin Leïla Bagny Beilhe Christian Cilas Gerben Martijn ten Hoopen Marie Ange Ngo Bieng Morag McDonald

Combining crop plants with other plant species in agro-ecosystems is one way to enhance ecological pest and disease regulation mechanisms. Resource availability and microclimatic variation mechanisms affect processes related to pest and pathogen life cycles. These mechanisms are supported both by empirical research and by epidemiological models, yet their relative importance in a real complex a...

2015
Hui Shi Zhaoping Yang Fang Han Tiange Shi Dong Li

Wetland protection, floral and faunal resource management, and habitat migration are all concerns for the ecological risk of wetland landscapes. Indices of landscape-scale ecological risks have the potential to influence changes in landscape patterns, the conditions of endangered plants and animals, and influences from nature and humans. Semi-variation function and gravity center models were us...

2008
Mercedes Pascual Pierre Mazzega Simon A. Levin

Predator-prey and other nonlinear ecological interactions often lead to oscillatory dynamics in temporal systems and in spatial systems when the rates of movement are large, so that individuals are effectively well mixed and space becomes unimportant. When individuals are not well mixed, however, properties of fluctuations in population densities, and in particular their amplitudes, are known t...

2013
Zdeněk Janovský Michael Mikát Jiří Hadrava Eva Horčičková Kateřina Kmecová Doubravka Požárová Jan Smyčka Tomáš Herben

Generalist pollinators are important in many habitats, but little research has been done on small-scale spatial variation in interactions between them and the plants that they visit. Here, using a spatially explicit approach, we examined whether multiple species of flowering plants occurring within a single meadow showed spatial structure in their generalist pollinator assemblages. We report th...

2015
Emily C Giles Pablo Saenz-Agudelo Nigel E Hussey Timothy Ravasi Michael L Berumen

A main goal of population geneticists is to study patterns of gene flow to gain a better understanding of the population structure in a given organism. To date most efforts have been focused on studying gene flow at either broad scales to identify barriers to gene flow and isolation by distance or at fine spatial scales in order to gain inferences regarding reproduction and local dispersal. Few...

Journal: :محیط زیست طبیعی 0
حسن پوربابایی گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا شیوا زندی ناوگران گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا محمد نقی عادل گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا

spatial pattern of trees is an important characteristic of plant communities. generating hypotheses relating to the structure of ecological communities is the aim of spatial pattern recognition. stands spatial patterns are measured and mapped by measuring tree locations in the stand and entering each coordinates into analytical frameworks. the spatial pattern of plant populations observed at an...

2011
Kasper Kok

Policies have many unforeseen impacts on social-ecological systems at different levels of spatial and temporal scales. Partly because of this, both scale and governance have been and continue to be hotly debated and studied topics within many scientific disciplines. Although there are two distinct vocabularies, both communities seem to be struggling to come to terms with a shift that has common...

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