(full paper is archived in the Miller Library)
Title: Species distribution of supralittoral lichens on the Southern shores of Monterey Bay, California
Student Author(s): Johnson, Julie M.
Faculty Advisor(s): Abbott, Isabella
Location: Final Papers Biology 175H
Date: June 1982
Keywords: upper intertidal
Abstract: The distribution of twelve supralittoral lichen species was investigated on the southern shores of Monterey Bay, California and related to their exposure to sea-water spray, aspect to the sun, and tidal height. Percentage cover was determined using a pin-hit technique. Tidal height and exposure to sea-water influence the distribution of several species, while aspect only affects one species. Aspect limits the distribution of Acarospora schleicheri (Ach.) Moss. to south-facing slopes, and influences the total percentage cover of other lichens. Some species investigated reflect different degrees of tolerance to salt water. Caloplaca bolanderi (Tuck.) Magn., Lecanora pinquis Tuck., Lecanora phragmites Tuck., and a pyrenocarpus lichen appear most tolerant to salt water exposure. The physical effects of waves may prohibit lichens from settling below 1.5 meters above the red alga Endocladia muricata (Post. and Rupr.) J. Ag., mean height approximately 1.2 meters above zero tide level. No upper limit was observed.