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Feeding and mating could be tied to tidal cycles for several organisms that occupy tidal basins or shorelines.
Crabs live from the bottom of the oceanic trenches to the top of the inter-tidal zone, to some cases of land Crabs such as on Christmas island. The highest concentration of crabs corresponds to the highest concentration of available food which is at the mid-tidal zone.
Oysters.
no!
Some that live in the bottom of the ocean, where no sunlight can reach it.
Star fish could live in the kelp, sea on the rocky floor.
There are some organisms that make there own food and that don't need vitamins from the sun.
Niche
there are many organisms that do not require sunlight to live but then there are some that need hosts
Both yes and no. Some tidal energy is very effective to the human body and some do not
Seaweed do not have to live in water all the time - think of inter-tidal periods when they are not in the water. Only some kinds of moss live in the water. Many kinds of mosses never live in the water - but do tend to live in a damp environment. The underlying concept to think about is dessication.
If you mean organisms that live in water, then that will affect the ecosystem because some organisms won't have the dead organisms that they used to feed on, which will cause their death. On the other hand, if you mean the death of organisms that live on land in water, then that will affect the water, and will probably make it contaminated, which will cause the death of the organisms that drink the contaminated water.