نتایج جستجو برای: ecosystems
تعداد نتایج: 45922 فیلتر نتایج به سال:
Learning to appreciate novel ecosystems will take practice and, as we argue in this chapter, perhaps some new approaches to valuing them. The challenge is not in learning to value novel ecosystems for the first time. After all, as Jackson (Chapter 7) notes, novel ecosystems are nothing new. Significant new ecological assemblies have arisen throughout the past. What is different now is the pace ...
Aquatic ecosystems in eastern China are suffering threats from heavy metal pollution because of rapid economic development and urbanization. Heavy metals in surface sediments were determined in five different aquatic ecosystems (river, reservoir, estuary, lake, and wetland ecosystems). The average Cd, Cr, Cu, Ni, Pb, and Zn concentrations were 0.716, 118, 37.3, 32.7, 56.6, and 204 mg/kg, respec...
The following information will familiarize you with ecosystems and their elements. Your students will visit several habitats during their field study so as to understand ecosystems as a whole. The following are descriptions of four habitats, which together make up a coastal ecosystem. This information should be presented to students prior to their visit and will be reinforced during their field...
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