Transcription of Ecosystem functions and services
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Ecosystem functions and services
CHAPTER 3 Ecosystem functions and servicesCagan H. SekerciogluIn our increasingly technological society, peoplegive little thought to how dependent they are onthe proper functioning of ecosystems and thecrucial services for humanity thatflow fromthem. Ecosystem services are the conditionsand processes through which natural ecosystems,and the species that make them up, sustain andfulfill human life (Daily 1997); in other words, the set of Ecosystem functions that are useful tohumans (Kremen 2005). Although people havebeen long aware that natural ecosystems helpsupport human societies, the explicit recognitionof Ecosystem services is relatively recent(Ehrlich and Ehrlich 1981a; Mooney and Ehrlich1997).Since the entire planet is a vast network ofintegrated ecosystems, Ecosystem services rangefrom global to microscopic in scale (Table ;Millennium Ecosystem Assessment 2005a).
(Alexander et al. 1997). Similarly, although sulfur is an essential element in proteins, excessive sulfur emissions from human activities lead to sulfuric acid smog and acid rain that harms peo-ple and ecosystems alike (Alexander et al. 1997). Phosphorous (P) scarcity limits biological nitro-gen fixation (Smith 1992). In many terrestrial eco-
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