Droughts caused by meteorological factors such as a long-term lack of precipitation can propagate into several types drought through the hydrological cycle. Among them, phenomenon in which has significant impact on ecosystem be defined an ecological drought. In this study, Ecological Drought Condition Index-Vegetation (EDCI-veg) was newly proposed to quantitatively evaluate and monitor effects ...

www.sciencemag.org (this information is current as of February 2, 2009 ): The following resources related to this article are available online at http://www.sciencemag.org/cgi/content/full/323/5910/133 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/1162986/DC1 can be found at:...

Nutrient pollution remains one of the leading causes river degradation, making it important to set thresholds that support good ecological condition, which is main objective managing Europe's aquatic environment. A wide range methods has been used by European member states nutrient in past, and these vary greatly among countries, even for similar types. In some have using expert judgement or st...

Aquatic ecological carrying capacity is an effective method for analyzing sustainable development in regional water management. In this paper, an integrated approach is employed for assessing the aquatic ecological carrying capacity of Wujin District in the Tai Lake Basin, China. An indicator system is established considering social and economic development as well as ecological resilience pers...

It is proved that a symmetry-breaking bifurcation occurs at a simple eigenvalue despite the usual transversality condition fails, and this bifurcation from a degenerate simple eigenvalue result complements the classical one with the transversality condition. The new result is applied to an imperfect pitchfork bifurcation, in which a forward transcritical bifurcation changes to a backward one wh...

A major challenge facing freshwater ecologists and managers is the development of models that link stream ecological condition to catchmentscale effects, such as land use. Previous attempts to make such models have followed two general approaches. The bottom-up approach employs mechanistic models, which can quickly become too complex to be useful. The top-down approach employs empirical models ...