Limnology and oceanography vol:38 issue:6 pages:1193-1199
Phenotypic variability in carotenoid content in a group of 28 Daphnia magna clones derived from two populations is shown to have a significant, albeit rather low, genetic component (h(B)2 = 0.23). To test the idea that pigmentation and vertical migration are two alternative mechanisms to reduce photodamage, we checked for a positive correlation between carotenoid content and phototactic behavior. Although no significant correlation was observed for the total group of clones, a significant and positive relation was found for the clones of one of the two populations. These results suggest that, in particular populations, depth during the day and carotenoid pigmentation can be co-selected.