A comparative study of intertidal species of Sphaeromidae (Isopoda Flabellifera)
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
Part I Ecological distributions of 10 sympatric littoral species of Sphaeromidae of rocky shores, and three species of brackish waters are described. Morphological and physiological differences are compared and correlated with distributions and environmental conditions. Population studies of the rocky shore species at Kaikoura show that distribution and breeding are closely related: in several species juveniles and adults are differently distributed, the greatest differences, together with the highest reproductive capacities occurring in the species exposed to the greatest wave action. Part II Geographic and seasonal variation in frequencies of colour forms of Isocladus armatus correlate with environmental differences in temperature; in the laboratory, colour forms showed differences in tolerance of temperature and salinity.