MEA 200 Lecture Notes - Lecture 20: Boulders Beach, Southern Australia, Mollusca

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Adjoin continents or islands to edge of continental shelf. Halocline is a strong, vertical salinity gradient within a body of water. Because salinity affects the density of seawater, it can play a role in its vertical stratification. Water stratification occurs when water masses with different properties - salinity (halocline), form layers that act as barriers to water mixing. A thermocline is a thin but distinct layer in a large body of water in which temperature changes more rapidly with depth. Among the most productive marine ecosystems with high biomass of benthic algae, seagrass and phytoplankton. Former river valley now flooded with seawater. Former glaciated valley now flooded with seawater. Lagoon separated from ocean by sand bar or barrier island. Faulted or folded down dropped area now flooded with ocean. Freshwater on top, saltwater on bottom (relatively no interaction) Upper layer less salty; lower layer more salty. The lighter freshwater flow out over the more dense seawater.

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