. The Canadian field-naturalist. 1978 McNeill and Cody: Species Diversity, St. Lawrence Islands 11 CORNWALL, • PETERBOROUGH. ST. LAWRENCE RIVER ISLANDS 1 ADELAIDE 10 GRENADIER 2 AUBREY 11 MALLORYTOWN 3 BEAURIVAGE 12 McDonald 4 CAMELOT 13 mermaid 5 CEDAR 14 MILTON 6 CONSTANCE 15 MULCASTER 7 ENDYMION 16 SQUAW 8 GEORGINA 17 STOVIN 9 GORDON 18 THWARTWAY Figure 1. Map of the upper portion of the St. Lawrence River showing the positions of the areas whose species composition was studied. The inset map shows the position in relation to Lake Ontario and to the Lake Ontario islands studied by Hainauh (
. The Canadian field-naturalist. 1978 McNeill and Cody: Species Diversity, St. Lawrence Islands 11 CORNWALL, • PETERBOROUGH. ST. LAWRENCE RIVER ISLANDS 1 ADELAIDE 10 GRENADIER 2 AUBREY 11 MALLORYTOWN 3 BEAURIVAGE 12 McDonald 4 CAMELOT 13 mermaid 5 CEDAR 14 MILTON 6 CONSTANCE 15 MULCASTER 7 ENDYMION 16 SQUAW 8 GEORGINA 17 STOVIN 9 GORDON 18 THWARTWAY Figure 1. Map of the upper portion of the St. Lawrence River showing the positions of the areas whose species composition was studied. The inset map shows the position in relation to Lake Ontario and to the Lake Ontario islands studied by Hainauh (1968). The numbers are those given to the islands in Table I. number of species occurring within it. This was done in order to explore a number of questions regarding the ecology and biogeography of these islands, both as a group and in relation to other studies of island biogeography (MacArthur and Wilson 1967; Simberloff 1974). There are five main questions. (1) Do the species-area relationships suggest that the islands form a homogeneous group or are any significantly different from the others? (2) Which of the possible models of species-area relation- ship shows the best fit to the data? (3) What conclusions regarding the ecology and floristic richness of the islands are suggested by fitting these models? (4) Do any differences emerge in comparisons with species-area relationships among the nearby Lake Ontario islands with a basically similar flora but on a limestone rather than granitic substrate? (5) Does the mainland area in the survey show any differences from the islands that might be interpretable in terms of island biogeographic theory? Most data on the occurrence of animal species are based on counts of the number of individuals of each taxon present in a given area; such information cannot usually be obtained, how- ever, for plants. Instead, in order to use models of species distribution such as the logarithmic series (Fisher et al. 1943) or the log-normal (Prest
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