How do different grain sizes have different implications?

The organisms living in the sediment has a lot less variation in salinity – more stable environment. This is because the grains can trap water for some time. Also effect how much POM in sediments. If retention time is higher there is more available. Grain size determiens composition of species. Mesopsammon – organisms that live in between grains. these animals are more affected by particle size and slope than wave action