CAS BI 107 Lecture Notes - Lecture 16: Ocean Current, Ecosystem Services, Diapause

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13 Nov 2016

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Lecture 16

• Climate-related changes

o Temperature, rainfall, frequency of extreme weather

o Altered ocean circulation and acidification

• Disturbances are natural and necessary to ecosystems, but megadisturbances are

not

o Disturbances are increasing in frequency, extent, and severity

o Human population growth imposes high demands on forests

• Short term—some forests will rebound from disturbances

• Long term—most temperate forests will change and no support the ecosystem

services as before

• Evolutionary history is also an important determinant of the distribution of

species

o Where and when groups originated

• Evolutionary history is in turn influenced by geological history

• Biogeography—the study of patterns of distributions of populations, species, and

communities (Wallace)

• Earth can be divided into biogeographical regions, each containing characteristic

species assemblages

o Boundaries occur where species composition changes dramatically over

short distances

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