Three-Spined Stickleback Fish (Gasterosteus Aculeatus) Show Substantial Heritable Variation in Gill-Raker

Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey, while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish?

A) directional selection
B) stabilising selection
C) disruptive selection
D) sexual selection

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