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Random and aggregative settlement in some sessile marine invertebrates

, : Random and aggregative settlement in some sessile marine invertebrates. Marine Ecology Progress Series 9(1): 97-100

Settlement patterns of 4 sessile invertebrates were statistically analyzed. In the field, the colonia ascidians Botryllus schlosseri and Diplosoma listerianum settled randomly on perspex panels. Laboratory experiments with D. listerianum substantiated these results and demonstrated that larvae were not attracted towards already attached juveniles. Two solitary species, the barnacle Elminius modestus and the ascidian Molgula complanata settle aggregatively, but the latter less strongly than the former. Species differed in their preference for horizontal or vertical panel orientation. The settlement pattern of each species was consistent and not influenced by panel orientation or by the presence of other species.

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