Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Diet and reproductive biology of the rocky intertidal prosobranch gastropod Tricolia pulloides
Student Author(s): Mooers, Mary G.
Faculty Advisor(s): Abbott, Donald
%E Abbott, Isabella
Pages: 21
Location: Final Papers Biology 175H
Date: June 1979
Keywords: midtide forest community
Abstract: 1. The diet and reproductive biology of Tricolia pulloides was investigated during the period April-June, 1979 at Mussel Point, Pacific Grove, California. 2. T. pulloides feeds primarily on pennate deatoms grazed as epiphytes from the surfaces of algal fronds; small particles of detritus and pieces of other epiphytes are probably picked incidentally. 3. T. pulloides contains food in its gut at both high and low tide. 4. T. pulloides shows roughly a 1:1 ratio of males to females. Females, averaging 3.14 mm in length, are very significantly larger than the males, averaging 2.62 mm in length, though the smallest females are much smaller than the largest males. 5. Females carry up to 206 and average 56.5 yellow yolky oocytes. Up to 104 eggs, averaging 32.5 eggs per clutch, are laid in a sinuous ribbon, coated with clear jelly. Egg clutches are located on algal fronds. 6. Eggs cleave spirally and develop directly within 7 days into clear, miniature snails that feed on naviculoid diatoms and cling tenaciously to algal fronds with the aid of mucus threads.
Notes: Publ 1981, Veliger 24: 103-108