Week 5 - Marine Fisheries Common-pool resources...

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Marine Fisheries Common-pool resources Unpredictable of resources availability Overexploitation of commercial species Exclusion is difficult Uneven competition between different sectors Pollution Climatic Hazards: El Nino Weak, warm current appearing around Christmas time along the coast of Ecuador and Peru Major influence on year-to-year climate variations Latin America Linked to floods, droughts, hurricanes Effects of El Nino/la Nina Normal years; o Cold water offshore Peru o Dry conditions on coast o rain in Andes and NE Brazil El Nino years (the opposite occurs): Peruvian fisheries Non-el Nino years, easterly wing drag surface water westward away from shore. Upwelling brings up deep colder and water rich in nutrients. El Nino: easterly winds and upwelling weaken in the eastern Pacific. Warm nutrient-poor water predominates the region and fish populations decline. Common Property Natural resources that are difficult to divide into individual units of ownership, like fisheries or forests. It is difficult to exclude people from these resources and there is a high probability of too many people using these resources. Tragedy of the Commons
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Assumes that collective use of resources will always result in abuse and degration because people cannot cooperate and can only act in self interest, thus only centralized regulation or privatization could solve the dilemma Common property theory Studies different forms of collective organization to manage common property resources Argues that tragedy of the commons occurs when there is open access Assumes that people can cooperate Small scale fisheries (Case Study) Gulf of California o Considered the most productive marine region of Mexico, the sonorant coast had numerous river discharges and densely populated areas o There are several fishing ports, small fishing communities, and 100s of seasonally occupied fishing camps Other anthropogenic pressures o The damming of rivers for agricultural purposes has reduced fresh water flows into
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Week 5 - Marine Fisheries Common-pool resources...

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