Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Vertical zonation and migration of two Tegula species: T. funebralis and T. brunnea
Student Author(s): Liaw, Shi Jane
Faculty Advisor(s): Watanabe, James
Pages: 25
Location: Final Papers Biology 175H
Date: June 1996
Abstract: Two intertidal species of Tegula T. brunnea and T. funebralis, display distinct vertical zonation. T. brunnea inhabit the lower intertidal to shallow subtidal zone, while T. funebralis are found in the upper-mid intertidal zone. Reciprocal transplants of each species to the habitat of the other revealed that T. brunnea returns to its typical height on the shore significantly more quickly than does T. funebralis. Transplanted T. brunnea and transplanted T. funebralis move significantly further and in a more consistent direction than do control animals placed back in their respective natural habitats. Although no statistical differences were observed between transplants done in high and low tides, a consistent trend of less movement by T. brunnea during low tides was observed. Microhabitat utilization during simulated low and high tides in the laboratory showed that T. brunnea remains submerged an on horizontal surfaces significantly more than T. funebralis, which tend to occupy vertical surfaces both above and below the waterline. Night and daytime behavior are similar for T. funebralis and differ for T. brunnea in the laboratory.