Factors affecting the vertical distribution of eggs [HELP 34]
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The spatia1 distribution of eggs and larvae is a function of the properties of the ambient water, i.e. the density, current and turbulent diffusion, and of the physical properties of the eggs, i.e. the buoyancy and dimension. The study of the vertical distribution is the first step to understanding the horizontal transport of eggs and larvae. Two models for the vertical distribution of eggs are applied to demonstrate how the physical and biological conditions influence the vertical distribution for the three main categories of eggs, here defined as pelagic, bathypelagic and bottom eggs. In particular, the physical conditions affecting the distribution of bathypelagic eggs are studied. The wind induced turbulence is the most important ambient factor for the vertical distribution of pelagic eggs and larvae. It contributes to mixing the buoyant eggs and larvae through the wind mixed layer. The vertical spreading of bathypelagic eggs depends mainly on the buoyancy distribution of the eggs. It is demonstrated from the model results that non-adhesive demersal eggs will be partly mixed into the water column. This mechanism contributes to the horizontal transport of demersal eggs.