. The Canadian field-naturalist. 1990 Notes 299. Figure 1. Aspects of achene of Bur-marigold, Bidens cernua, showing positioning of barbed awns (A), and integumental attachment to the gular region (B) and tail (C) of a Yellow-spotted salamander, Ambystoma maculatum. irregular intervals as dictated by terrain and subsurface structures. The area covered by the fence represented approximately l/50th of the total shoreHne circumference. Breeding migrations began on the evening of 3 April and continued until 30 April at intervals which coincided with extensive precipitation (rain or wet snow) and f
. The Canadian field-naturalist. 1990 Notes 299. Figure 1. Aspects of achene of Bur-marigold, Bidens cernua, showing positioning of barbed awns (A), and integumental attachment to the gular region (B) and tail (C) of a Yellow-spotted salamander, Ambystoma maculatum. irregular intervals as dictated by terrain and subsurface structures. The area covered by the fence represented approximately l/50th of the total shoreHne circumference. Breeding migrations began on the evening of 3 April and continued until 30 April at intervals which coincided with extensive precipitation (rain or wet snow) and favorable temperatures. Buckets were checked daily, species, numbers and sex recorded, blood samples taken {A. laterale-jeffersonianum com- plex individuals only) and then all animals were released on the pond side of the fence. During this survey, we encountered several salamanders (genus Ambystoma) and a single Wood Frog (Rana sylvatica) which carried Pea Clams attached to the digits of their feet, as was reported previously under similar circumstances in Nova Scotia (Davis and Gilhen 1982), and encountered elsewhere (New Brunswick, Quebec and Ontario; personal observation). In addition to this phenomenon, we also recorded numerous instances in which salamanders bore a flat, pointed brown seed. Table 1 summarizes these observa- tions. Data for the two frog species are unreliable as these animals can readily escape from buckets. The seeds were firmly attached to the integument, typically on or near the head and occasionally on the tail (Figure 1). Attachment was by means of four barbed awns which projected longitudinally from the expanded end of a flattened elongate tetrahedral (Figure 1). The seeds were removed and later identified as the fruit or "achenes" of the Bur-marigold, Bidens cernua (Compositae), a plant common in wet habitats in northeastern North America (Montgomery 1977; Peterson and McKenny 1968). Because salamanders arrived at the pond bearing both Pea
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