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Lecture 15

BIOB50Winter2012 Lecture 15.docx -includes imagies and extra notes from assigned reading!

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University of Toronto Scarborough
Biological Sciences
Marc Cadotte

BIOB50QWinter2012Lecture 15 Community Change Agents of ChangeAgents of change act on communities across multiple temporal and spatial scales Consider a coral reef community in the Indian Ocean If you look back at it over the last few decades you would observe slow and subtle changes as well as catastrophic ones Figure 163 Change Happens Coral reef communities in the Indian Ocean have experienced significant changes over the last few decades The agents of change have been subtle and catastrophic natural and humancaused Species interactions such as competition predation and disease can case the gradual replacement of species over time Changes in abiotic conditions such as sea level and water temperature can cause physiological stress coral bleaching and eventually mortality Catastrophic disturbances such as tsunamis can cause massive injury and death in coral reefsCase Study Killer AlgaeIn the 1980s an unusual alga caulerpa taxifolia was found in the Mediterranean Sea It was a native of warm Caribbean waters 1820 degrees It had never been found in colder waters 1213 degrees nor in such densities French marine biologists calculated its rate of spread at 1 hectare in 5 years1
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