Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Distribution, activity, and food habits of juvenile Tegula funebralis and Littorina scutulata (Gastropoda: Prosobranchia) as they relate to resource partitioning
Student Author(s): Jensen, Jeffrey T.
Faculty Advisor(s): Abbott, Donald
Pages: 22
Location: Final Papers Biology 175H
Date: June 1979
Keywords: midtide forest community
Abstract: Field studies of distribution of juveniles (4mm or less in greatest shell dimension) of Tegula funebralis and Littorina scutulata indicate they occupy largely separate subhabitats. T. funebralis juveniles occur predominantly in the sandy holdfasts of macroalgae and in rock crevices, less than 4.0 feet above mean lower low water. Littorina scutulata juveniles are found mainly on the fronds of macroalgae and in empty barnacle shells more than 3.0 feet above MLLW. The greatest overlap between the populationns occurs between the 3.0 and 4.0 foot tidal levels. Laboratory experiments in aquaria with artificial tides demonstrate a similar partitioning. Juveniles of both species appear to be mainly relatively non-selective detritivores. Young Littorina scutulata consume more green algae and diatoms, but this may reflect incidental ingestion of epiphytes. While the two species consume roughly the same food, they obtain it in different places, so competition appears slight.
Notes: Publ 1981, Veliger 23: 333-338