Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Microscopic algal food of Littorina planaxis and Littorina scutulata
Student Author(s): Foster, Michael S
Faculty Advisor(s): Blinks
Pages: 22
Location: Final Papers Biology 175H
Date: June 1964
Keywords: periwinkle
Abstract: 1. The following algae were identified in the habitat of Littorina planaxis and L. scutulata (* denotes positive identification as food): Chlorophyta - (*)Spongomorpha coalita, (*)Entocladia testarums (on shells), (*) Unicellular greens; Cyanophyta - (*)Plectonema terebrans, (*)Calothrix pilosa, (*) Calothrix crustacea, Dermocarpa sp., Spirulina sp., (*)Unicellular blue-greens; Rhodophyta - (*)Rhodochorton rothii; (*)Diatoms. 2. The standing crop of the microscopic algae on granite surfaes is 37gs carbon/m^2 with a production rate of 1.66 gs carbon/m^2/day. Production rate for the algae on the shells of L. planaxis is .981 gs carbon/m^2/day. The pigment content of the algae on the shells is much greater than that of a rock or Ulva surface of similar size. 3. In 25 days, ten snails reduce the algao pigment content of a 225 cm^2 granite surface by approximately 8% when compared with an ungrazed surface of similar size.
Notes: Published 1964, Veliger 7: 149-152