. The Canadian field-naturalist. 1996 Notes 537. ,^.. i^Ju'iL-j^~. j-*ajr«aAi.'*.' Figure 1. White-winged Black Tern (Chlidonias leii- copterus) at West Twin Lake, Churchill, Manitoba, 27 June 1995. Figure 2. Two Arctic Terns (Sterna paradisaea, left) chas- ing a White-winged Black Tern (Chlidonias leu- coptems) as it attempted to land in their colony. tions were made within km of an Arctic Tern colony of approximately 100 birds. The far northern and usually coastal breeding range of the Arctic Tern is so different from that of the temperate and marsh-nesting White-winged Tern that the t
. The Canadian field-naturalist. 1996 Notes 537. ,^.. i^Ju'iL-j^~. j-*ajr«aAi.'*.' Figure 1. White-winged Black Tern (Chlidonias leii- copterus) at West Twin Lake, Churchill, Manitoba, 27 June 1995. Figure 2. Two Arctic Terns (Sterna paradisaea, left) chas- ing a White-winged Black Tern (Chlidonias leu- coptems) as it attempted to land in their colony. tions were made within km of an Arctic Tern colony of approximately 100 birds. The far northern and usually coastal breeding range of the Arctic Tern is so different from that of the temperate and marsh-nesting White-winged Tern that the two species can come together only by acci- dent. Thus, it will be difficult to learn whether the interactions described above represented a general response to intruders in the colony by Arctic Terns, which are generally considered to be very aggres- sive, or a specific response to the bold black-and- white flight pattern of the White-winged Tern. That the former might have been the case is suggested by a further observation from Churchill (Y. Zharikov, 12 June 1996) of Arctic Terns chasing a Black Tern {Chlidonias niger); the latter is a dark-bodied, but less boldly-marked, North American species that is closely related to the White-winged Tern. Farther south in the interior of North America, light- plumaged ( Common [S. hirundo] and Forster's [5. forsteri]) terns nest amicably with Black Terns (W. Scharf, personal communication). Additional observations of interactions between light- and dark- bodied terns in the breeding season would be of interest. Acknowledgments I thank Arnet Sheppard, Brenda and Tony Holcombe, Jan van Gils, Irene Tieleman, Scott Yaeger, Bonnie Chartier, Yuri Zharikov and Rudolf Koes for their help in the preparation of this account, and E. Dunn and A. J. Erskine for comments on the manuscript. Received 7 November 1995 Accepted 17 April 1996. Please note that these images are extracted from scanned page images that may have been digitally enhanced f
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