Depending on the ecosystem there may be cri6cal

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Unformatted text preview: i/File:Chilean_purse_seine.jpg 1900 2000 Christensen et al. 2003, Fish & Fisheries Biomass of Table Fish Fisheries collapse is a prominent example of a threshold- type, non- linear response of a species or an ecosystem to human disturbance. Tipping Point: a threshold beyond which further disturbance Environmental parameter results in a large, rapid change to a different state. Tipping points are olen difficult to predict, and cons6tute environmental surprises. Period of liHle change with increasing disturbance. The system is resilient to disturbance low Tipping point. A small further increase in disturbance suddenly results in a large change in the state of the system. Disturbance high Ecosystem resilience to disturbance can make it difficult to identify critical threshold Ecosystem func6on (e.g. fisheries produc6vity) Assuming a type II (linear) response makes it look as though fishing pressure can s6ll be substan6ally increased low fishing pressure high Ecosystem resilience to disturbance can make it difficult to identify critical threshold Ecosystem func6on (e.g. fisheries produc6vity) Tipping point low fishing pressure In reality, the shallow ini6al slope may be due to ecosystem resiliance at lower level disturbance. Depending on the ecosystem, there may be...
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This note was uploaded on 01/30/2014 for the course IB 105 taught by Professor Caceres during the Fall '08 term at University of Illinois, Urbana Champaign.

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