The specific example of the elasmobranchs, the cownose rays which are feed on the bay scallop causes the shutdown of scallop fisheries due to the over abundance in cownose rays. This effect is exhibit when the top-down control becomes weakened. In the western Atlantic, the great sharks which are the apex predators have highly decreased in number in recent years due to overexploitation of the high demand in shark fins and meat causing mesopredaotors to increase abundantly and forced the scallop fisheries to shut down...
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In the marine ecosystem, the relationship between the three functional groups are the higher tropic level species feeds on the ones at the next lower level. Since the relationship is very closely related to one another, the removal of the apex predator would cause the next level species (mesopredators) to increase...
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