Abstract
The Portuguese coast is located in a biogeographic transition zone, between temperate and subtropical waters where the northern or southern distribution limits of many species overlap. Portuguese coastline is characterized by specific hydrographical features with a cooler northern region affected by both upwelling and rainfall leading to higher volume of river run-off, and a much warmer southern region with a strong Mediterranean influence. This, in addition to the differential distribution of sediment types along the coast (coarser sediments in the North and finer sediments toward the South) makes the northwestern marine biological communities differ considerably from the central and southern.
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