The moon and sun both have an effect on the ocean's tides. Which type of tide would most affect the abundance of aquatic organisms in a marine ecosystem and why?
Neap tide, because there is a large fluctuation between high and low tides
Neap tide, because there is little fluctuation between high and low tides
Spring tide, because there is little fluctuation between high and low tides
Spring tide, because there is a large fluctuation between high and low tides

Tides occur due to gravity of the sun and the moon. High tide means rise in sea level and low tide means decrease in the sea level. Marine lives get effected due to tides.

Highest high tides and lowest low tides occur when the effect of the gravitational pull of sun and the moon is strongest. This happens when the three -the sun, the earth and the moon align in one straight line. these are known as spring tides. It happens twice a month during new moon and full moon. At this time, there is maximum difference or maximum fluctuation between high and low tides.

Neap tides are those which occur when the effect of the combined gravity of the sun and moon is the least - when they are right angles. There is minimum difference between the highest high tides and the lowest low tides.

Thus, the abundance of the aquatic organisms in a marine ecosystem gets effected during spring tides.