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Marine ecosystems
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"Marine ecosystems
Paul R Epstein, Timothy E Ford, Rita R Colwell *
Waterborne infection, from marine or freshwater sources, is the leading cause of illness worldwide, and fish provide more animal protein for human consumption than poultry or meat. Today the health of large marine ecosystems--their diversity, productivity, and resilience--is threatened [ 1 ] by a "global epidemic" of coastal algal blooms. [ 2 ] This overgrowth of algae has profound implications for water and food safety because vibrios adhere to phytoplankton (algae) and zooplankton, and "red tides" bear biotoxins responsible for fish and shellfish poisoning. Furthermore nutrient-rich effluents stimulate algal growth and warmer sea surface temperatures shift marine ecosystems towards more toxic species.
Dormant V cholerae and algal blooms
Cholera becomes endemic when water and sanitation systems are not kept apart, but other environmental factors affect both the inoculum and persistence of this ancient pathogen. In 1991 cholera struck Peru from Chancay (Lima's port city) to the port of Chimbote 400 km north, the next day. Cholera soon surfaced all along the 2000 km Peruvian coast. It then spread rapidly to ports in Ecuador, Colombia, and Chile, and then to Brazil, Venezuela, and Bolivia, following rivers and streams. Over 15 months, more than half a million people fell ill and almost 5000 died in nineteen Latin American nations. [ 3 ]
The Peruvian coast is prolific in phytoplankton and their chief consumers, anchovies. Human activities are enhancing the blooms. From March to August, 1991, Vibrio cholerae O1, biotype El Tor, serotype Inaba was isolated from marine plankton near Lima; V cholerae O1 has been recovered from the bilge of Latin American vessels docked in US Caribbean ports, and seems to have crossed the Pacific as a "stowaway" from Bangladesh.
Since 1960 researchers in Bangladesh have related the seasonality of cholera to coastal algal blooms, [ 4 ] but the rese"
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