نتایج جستجو برای: scale ecological research at various spatial

تعداد نتایج: 5581658  

2014
Johan Bergström Sidney W. A. Dekker

We pursued the following three interconnected points: (1) there are unexplored opportunities for resilience scholars from different disciplines to cross-inspire and inform, (2) a systems perspective may enhance understanding of human resilience in health and social settings, and (3) resilience is often considered to be fractal, i.e., a phenomenon with recognizable or recurring features at a var...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم 1376

saluk mount is selected for devonian biostratigraphy. this area located at southwest of bojnurd. in this study three sections are selected and two sections, chahar-borj and tabar sections with a thickness of 650 m, which consist mainly of calcareous sediments was studied in detailed but third section, qelli section, with a thickness of about 450m which consist mainly of sandstone and evaporates...

2002
Judith Bayard Cushing Nalini Nadkarni Lois M. L. Delcambre David Maier

The Biodiversity and Ecosystem Informatics Research Agenda (http://bio.gsfc.nasa.gov) notes current inability to compare data across spatial scales as a critical problem: “Biological data from different sources are frequently collected and presented in different scales and resolutions resulting in a loss of detail when multiple data sets are required for data synthesis and analysis.” The propos...

With the increasing use of spatial data in daily life, the production of this data from diverse information sources with different precision and scales has grown widely. Generating new data requires a great deal of time and money. Therefore, one solution is to reduce costs is to update the old data at different scales using new data (produced on a similar scale). One approach to updating data i...

Journal: :Trends in ecology & evolution 1999
Bjørnstad Ims Lambin

The search for mechanisms behind spatial population synchrony is currently a major issue in population ecology. Theoretical studies highlight how synchronizing mechanisms such as dispersal, regionally correlated climatic variables and mobile enemies might interact with local dynamics to produce different patterns of spatial covariance. Specialized statistical methods, applied to large-scale sur...

2015
Yue M. Li Brian J. Enquist

scale analyses are essential for revealing how the infl uence of specifi c ecological factors changes with scale (Wiens 1989). In this study, we present a novel methodology that can be broadly-applied to assess the scale-dependency of species ’ distributions. Distribution changes – such as those that occur in response to species introductions or climate change – provide ecological experiments t...

2011
Nelson Valdivia Ricardo A. Scrosati Markus Molis Amanda S. Knox

In rocky intertidal habitats, the pronounced increase in environmental stress from low to high elevations greatly affects community structure, that is, the combined measure of species identity and their relative abundance. Recent studies have shown that ecological variation also occurs along the coastline at a variety of spatial scales. Little is known, however, on how vertical variation compar...

2002
Ladislav Miklos

Development of the general ecological model (EM) of the CSSR has been included in the state program for environmental policy the Ecoprogramme of the CSSR at a scale of 1 : 1 000 000 for the entire Czechoslovak territory and at a scale of 1500 000 for the Czech Socialist Republic (CSR) and the Slovak Socialist Republic (SSR). The objective of the first EM stage was to make a survey of spatial di...

2016
Maarten J. van Strien Cornelis T. J. Slager Bauke de Vries Adrienne Grêt‐Regamey

Many studies have assessed the effect of landscape patterns on spatial ecological processes by simulating these processes in computer-generated landscapes with varying composition and configuration. To generate such landscapes, various neutral landscape models have been developed. However, the limited set of landscape-level pattern variables included in these models is often inadequate to gener...

2009
Samuel A. Cushman Kevin S. McKelvey

In the first chapter of this book we identified the interdependence of method, data and theory as an important influence on the progress of science. The first several chapters focused mostly on progress in theory, in the areas of integrating spatial and temporal complexity into ecological analysis, the emergence of landscape ecology and its transformation into a multi-scale gradient-based scien...

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