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2. Human impact on the environment - Wikipedia

   en.wikipedia.org/wiki/Human_impact_on_the...

   Contaminants can come from one of four main sources. These are sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater. [153] Water pollution may affect either surface water or groundwater. This form of pollution can lead to many problems. One is the degradation of aquatic ecosystems.

3. Ecosystem ecology - Wikipedia

   en.wikipedia.org/wiki/Ecosystem_ecology

   Ecosystem ecology is the integrated study of living and non-living components of ecosystems and their interactions within an ecosystem framework. This science examines how ecosystems work and relates this to their components such as chemicals , bedrock , soil , plants , and animals .

4. Ecosystem - Wikipedia

   en.wikipedia.org/wiki/Ecosystem

   [3] [4]: 5 [2]: 458 The biotic and abiotic components are linked together through nutrient cycles and energy flows. [5] "Ecosystem processes" are the transfers of energy and materials from one pool to another. [2]: 458 Ecosystem processes are known to "take place at a wide range of scales". Therefore, the correct scale of study depends on the ...

5. Freshwater ecosystem - Wikipedia

   en.wikipedia.org/wiki/Freshwater_ecosystem

   Freshwater ecosystems have undergone substantial transformations over time, which has impacted various characteristics of the ecosystems. [4] Original attempts to understand and monitor freshwater ecosystems were spurred on by threats to human health (for example cholera outbreaks due to sewage contamination). [5]

6. Forest ecology - Wikipedia

   en.wikipedia.org/wiki/Forest_ecology

   Forest ecology shares characteristics and methodological approaches with other areas of terrestrial plant ecology, however, the presence of trees makes forest ecosystems and their study unique in numerous ways due to the potential for a wide variety of forest structures created by the uniquely large size and height of trees compared with other ...

7. Biological interaction - Wikipedia

   en.wikipedia.org/wiki/Biological_interaction

   The black walnut secretes a chemical from its roots that harms neighboring plants, an example of competitive antagonism.. In ecology, a biological interaction is the effect that a pair of organisms living together in a community have on each other.