Chapter 3 Ecosystem Ecology Part 2. BioGeoChemical Cycles The movement of matter within and between ecosystems involving biological, geologic and chemical.

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Presentation transcript:

Chapter 3 Ecosystem Ecology Part 2

BioGeoChemical Cycles The movement of matter within and between ecosystems involving biological, geologic and chemical processes.

Ecosystems respond to disturbance Disturbance- An event caused by physical, chemical or biological agents that results in changes in population size or community composition.

Resistance versus Resilience Resistance- A measure of how much a disturbance can affect its flows of energy and matter. Resilience- The rate at which an ecosystem returns to its original state after a disturbance. Resilience of an ecosystem ensures that it will continue to provide benefits to humans. This greatly depends on species diversity. Restoration ecology- A new scientific discipline that is interested in restoring damaged ecosystems Ecological Succession (chapter 6) - The replacement of one group of species by another group of species over time. p.168 Even without human activity, natural communities do not stay the same forever. Change in the species composition of communities over time is a perpetual process in nature.Even without human activity, natural communities do not stay the same forever. Change in the species composition of communities over time is a perpetual process in nature.

Primary Succession Primary succession- occurs on surfaces that are initially devoid of soil.

Secondary Succession Secondary succession- occurs in areas that have been disturbed but have not lost their soil.

Aquatic Succession

Instrumental Values of Ecosystems Provisions - Goods that humans can use directly. Regulating services- The service provided by natural systems that helps regulate environmental conditions. Support systems- The support services that natural ecosystems provide such as pollination, natural filters and pest control. Cultural services- Ecosystems provide cultural or aesthetic benefits to many people.