. The Canadian field-naturalist. . â TfcJilorw-^ Lower Estuary and Gulf Figure L Yellow Rail study sites along the St. Lawrence River, Quebec. capture techniques). At Cacouna, one plot was ran- domly positioned in each spot (n = 34) where a total of nine individuals were captured, recaptured, or located by radio-tracking in June and July 1993. Habitat sampling was delayed and took place on 1â 2 September 1993 at Cacouna and 2â3 September 1994 in Lake Saint-Franfois NWA. Although no nests were found at these two localities (Robert and Laporte 1997), we suspect that Yellow Rails do nest there be
. The Canadian field-naturalist. . â TfcJilorw-^ Lower Estuary and Gulf Figure L Yellow Rail study sites along the St. Lawrence River, Quebec. capture techniques). At Cacouna, one plot was ran- domly positioned in each spot (n = 34) where a total of nine individuals were captured, recaptured, or located by radio-tracking in June and July 1993. Habitat sampling was delayed and took place on 1â 2 September 1993 at Cacouna and 2â3 September 1994 in Lake Saint-Franfois NWA. Although no nests were found at these two localities (Robert and Laporte 1997), we suspect that Yellow Rails do nest there because we heard several calling males while conducting our research and saw a female in each place (Robert and Laporte 1999). We calculated the frequency of occurrence of plant species at each locality, including He aux Grues (all nests combined), on the basis of species dominance in each sampled plot. Contrary to the method used at lie aux Grues (see above) and Cacouna (same procedure as for lie aux Grues), veg- etation sampling at Lake Saint-Frangois NWA was done by identifying, in terms of basal cover, the dominant and sub-dominant species without making percentage estimates. We therefore converted the semi-quantitative percent cover classes found at lie aux Grues and Cacouna to qualitative classes of dominance and sub-dominance similar to the ones found at Lake Saint-Fran9ois NWA: in each plot, the plant species with the highest percentage basal cover was considered dominant, while the one with the second highest percentage basal cover was consid- ered sub-dominant. At all sites, more than one plant species could be classified dominant or sub-domi- nant in a plot (if they had the same semi-quantitative percent cover class), although the same species could never be dominant and sub-dominant in the same plot. Water levels From early June to September 1993, we regularly (generally weekly) measured standing water depth at 5 and 12 randomly selected stations at He aux Grues an
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