. The Canadian field-naturalist. 1976 Weir and Cooke: Autumn Shorebirds Near Kingston, Ontario 109 ance were constructed for these species where sample sizes were sufficient. These are shown in Figure 3. In the case of all three species the patterns deduced from the composite histogram in Figure 2 can be detected in most of the individual year's data. It is interesting to note that a possible exception occurred in 1972 where only a single peak is evident. This coincides with the disastrous arctic breeding conditions in that year resulting from exceptionally late snowfalls and lack of available
. The Canadian field-naturalist. 1976 Weir and Cooke: Autumn Shorebirds Near Kingston, Ontario 109 ance were constructed for these species where sample sizes were sufficient. These are shown in Figure 3. In the case of all three species the patterns deduced from the composite histogram in Figure 2 can be detected in most of the individual year's data. It is interesting to note that a possible exception occurred in 1972 where only a single peak is evident. This coincides with the disastrous arctic breeding conditions in that year resulting from exceptionally late snowfalls and lack of available nesting sites (S. D. MacDonald, High Arctic Research Station at Bathurst Island, personal communication). Where possible our observations included 20 0 20 0 20 0 20 0 20 0 40 0 80 0 40 0 40 â H 1 B -ll.^ll. 1973 â I 1972 . 1 1971 SEMIPALMATED PLOVER _i_aJ I SEMIPALMATED SANDPIPER 1974 jLiL il - - Li. * NO OBSERVATIONS LEAST SANDPIPER â â â III â â 0 40 cr ^40 0 40 rrrrri i i i i 12 26 9 23 6 20 4 18 I 15 29 JUL AUG SEP OCT NOV JiLlL . d Jj l#U4i r-r^ -TTâIâIâIâIâ 12 26 9 23 6 20 4 IB I 15 29 JUL AUG SEP OCT NOV Figure 3. Weekly numbers of three species of migrating shorebirds in each of the years Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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