نتایج جستجو برای: have variable ecosystems
تعداد نتایج: 3135311 فیلتر نتایج به سال:
W3 2013/11/22 Junshina source 2730’14.0’’ 8938’08.0’’ 2343 5 8.2 None W4 2013/11/22 Cheri side 2735’36.4’’ 8937’42.9’’ 2574 4.5 8.7 None W5 2013/11/22 Dodena river 2735’36.0’’ 8937’44.3’’ 2574 4.5 8.6 None W6 2013/11/22 Wangchu river 2727’20.1’ 8939’06.1’’ 2310 5 8.6 368 W7 2013/11/22 Simtokha river 2726’18.6’’ 8940’21.1’’ 2375 5 8.5 344 W8 2013/11/23 A house in Changjiji Residential Colony 272...
Coverage rate, a critical variable for gridded forest area, has been neglected by previous studies in estimating the annual gross primary production (GPP) of global forest ecosystems. In this study, we investigated to what extent the coverage rate could impact forest GPP estimates from 1982 to 2011. Here we show that the traditional calculation without considering the coverage rate globally ove...
Global warming leads to increased intensity and frequency of weather extremes. Such increased environmental variability might in turn result in increased variation in the demographic rates of interacting species with potentially important consequences for the dynamics of food webs. Using a theoretical approach, we here explore the response of food webs to a highly variable environment. We inves...
Experiments suggest that biodiversity enhances the ability of ecosystems to maintain multiple functions, such as carbon storage, productivity, and the buildup of nutrient pools (multifunctionality). However, the relationship between biodiversity and multifunctionality has never been assessed globally in natural ecosystems. We report here on a global empirical study relating plant species richne...
Body size in contemporary ecology Body size and variation in body size have formed the focus of many studies in ecology, ranging from the study of individual performance to large-scale communities and ecosystems (Werner & Gilliam, 1984, Gaston & Lawton, 1988, Werner, 1988, Cohen, Johnson & Carpenter, 2003, Brown et al., 2004, Loeuille & Loreau, 2005). This focus is well-founded given the large ...
Whether there are common and emergent patterns from marine ecosystems remains an important question because marine ecosystems provide billions of dollars of ecosystem services to the global community, but face many perturbations with significant consequences. Here, we develop cumulative trophic patterns for marine ecosystems, featuring sigmoidal cumulative biomass (cumB)-trophic level (TL) and ...
The purpose of this study was to examine the effect of a concurrent record of chest pain episodes on later completeness and accuracy of verbal recall. Patients included 23 men and eight women, ages 43 to 76 years from a private cardiology practice who were randomized into experimental (n = 16) and control (n = 15) groups. Following an initial interview, experimental patients were instructed in ...
© The Ecological Society of America www.frontiersinecology.org E nitrogen (N) concentrations, often in the form of nitrate, present a water-quality problem of growing concern. Nitrate concentrations in groundwater and rivers in developed areas of the world have risen substantially as a result of the use of synthetic N fertilizers and cultivation of N-fixing crops (Turner and Rabalais 2003). Inc...
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