Individual organisms contribute to nutrient cycling in ecological
systems, which is shown to be a mechanism of homeostasis at that
level. The phosphorus and nitrogen cycles are used to illustrate
effects of changes in populations or communities on the cycling of
these nutrients. Major disturbances such as deforestation and
global climate change disrupt nutrient cycles and ecological system
homeostasis. Data are examined to determine effects of
deforestation on nutrient cycling. Increasing atmospheric carbon
dioxide and global climate change are disrupting ecological
systems' homeostasis, and several studies are used to show how this
is happening, including changes in primary production, temperature
and precipitation patterns. This book also discusses the role of
individual species in filtering contaminants and pollutants from
ecological systems.
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