How do tides affect ocean life?
Fluid molecules make compounded periodic oscillations, due to
periodic changes in the lunar and solar attractions of the Earth. This
goes unnoticed, in continental waters, including rivers.
In seas, this causes tides.
The rise and fall are periodic, with every day mini/max due to the
Earth's day/night spin, that lead to annual mini/max levels,. In a lunar
month of about 27 days, at New Moon,
The rise is a maximum due to the Sun-Moon-Earth alignment.
At the opposite Sun-Earth-Moon alignment, at Full Moon, it is a
minimum. So, there are about 13 maximum ( Spring Tide ) levels and
about 13 ( Neap Tide ) minimum levels, in a year.
EDGE EFFECT: In Spring Tides, there is heavy inflow into river
mouths, bays and estuaries The recession of this seawater, back to
the sea, is complete in the following neap tide.
It is obvious that this to and fro current on the shores of seas
affects sea life at the bottom near shore and edge of the seas.
BOTTOM EFFECT: Also, at even greater depths, mild wetting and
drying cycle. due to rise and fall of the entire localized body of sea
water, affects sea life, far away, from the shores.