نتایج جستجو برای: environmental ecosystems
تعداد نتایج: 405619 فیلتر نتایج به سال:
Protecting and preserving our environmental systems require the ability to understand the spatio-temporal distribution of soils, parent material, topography, and land cover as well as the effects of human activities on ecosystems. Space-time modelling of ecosystems in an environmental digital library is essential for visualizing past, present, and future impacts of changes occurring within such...
The Arctic faces many environmental challenges, including the continued exploitation of its mineral resources such as nickel (Ni). responsible development Ni mining in requires establishing a risk assessment framework that accounts for specificities this unique region. We set out to conduct preliminary assessments exposure and effects aquatic ecosystems. Our analysis source transport processes ...
Citation: Tam JC, Link JS, Large SI, Andrews K, Friedland KD, Gove J, Hazen E, Holsman K, Karnauskas M, Samhouri JF, Shuford R, Tomilieri N and Zador S (2017) Comparing Apples to Oranges: Common Trends and Thresholds in Anthropogenic and Environmental Pressures across Multiple Marine Ecosystems. Front. Mar. Sci. 4:282. doi: 10.3389/fmars.2017.00282 Comparing Apples to Oranges: Common Trends and...
Herbivores are regulated by predation under certain environmental conditions, whereas under others they are limited by forage abundance and nutritional quality. Whether top-down or bottom-up regulation prevails depends both on abiotic constraints on forage availability and body size, because size simultaneously affects the risk of predation of herbivores and their nutritional demands. Consequen...
The concept of developing early warning systems at a range of scales to reduce the likelihood of negatively impacting ecosystems is not new. Early warning systems are often developed in response to specific, immediate concerns such as major weather events (e.g., hurricanes, cyclones, tornados) or geo-physical events (e.g., earthquakes, tsunamis, tidal waves). There is also a need to develop ear...
Although diversity-stability relationships have been extensively studied in local ecosystems, the global biodiversity crisis calls for an improved understanding of these relationships in a spatial context. Here, we use a dynamical model of competitive metacommunities to study the relationships between species diversity and ecosystem variability across scales. We derive analytic relationships un...
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