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Principle_6_9-12_Nov_07, Some changes caused by humans are topographical. ???? The draining of wetlands and estuaries destroys fish nurseries bird nesting areas, marine mammal rookeries and removes coastal protection., Overfishing leads to the collapse of marine fisheries. When fisheries collapse, ocean ecosystems, pred/prey relationships are altered and food webs are destabilized. ???? Demands of the aquarium trade, recreation and terrestrial construction have exacerbated the destruction of marine ecosystems., The ocean provides many essential ingredients for human life to exist, develop and thrive on earth ???? The ocean is a source of inspiration, recreation, rejuvenation and an element of cultural heritage., Some changes are biochemical ???? Biomagnification of pollutants and pesticides disrupts ecosystems and leads to death or changes in reproductive sucess of organisms., Some changes are biochemical ???? Rapid growth of some algae is responsible for poisonings of marine birds, mammals and some humans and the smothering of corals., Some changes are physical/chemical ???? Changes in current patterns in the ocean can affect climate and weather which also affect biodiversity and migratin patterns and fisheries., Large human populations and technological advances have exacerbated negative human impacts on the ocean. ???? Some changes are biochemical, The ocean provides an incredible array of resources necessary for life to exist on earth. ???? Many natural, non- renewable resources are extracted from the sea floor including mineral ores, petroleum and gas., Much of the worlds population lives in coastal areas. ???? Humans are negativel affected by natural hazards such as tsunamis, hurricanes, and coastal erosion., Large human populations and technological advances have exacerbated negative human impacts on the ocean. ???? Some changes are physical/chemical