The dominant species on each alga fluctuated in abundance seasonally, and the timing of population maxima differed noticeably between species. Fluctuations in abundance were usually related to reproductive activity, which was largely unrelated to environmental temperature. Total densities on algae were highest in the spring for Corallina (578 individuals per 10 cm2) and Ecklonia (6 per 10 cm2), in summer for Enteromorpha (366 per 10 cm2), Zonaria (86 per 10 cm2), and Pterocladia (66 per 10 cm2) and in autumn for Xiphophora (39 ,per 10 cm2).
Received 13 September 1976; revision received 1 March 1977. N.Z. Journal of Marine and Freshwater Research 11 (4): 621-43.
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