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No single survey is sufficient to monitor the Palm Warbler in Canada at the national level. However, results from Breeding Bird Survey (BBS), the Christmas Bird Count (CBC) and the Atlas of the Breeding Birds of Ontario, all of which agree that there have been increases in the population or its distribution, contribute to the monitoring of this species in Canada. The BBS provides the best national-level data for population assessment despite low precision in the results and poor coverage of the northern portion of the breeding population. Results indicate a large increase since 1970. CBC data support the BBS results by indicating a similar large increase on the wintering grounds in the western and southern United States, where a large portion of the population over-winters. Finally, for the Ontario portion of its range, further evidence is found in the Ontario Atlas. It documents an increase in occurrence between the two Atlas periods, although it too only covers a small portion of national population and only covers the 20-year period between the first and second Atlases. Considered together, these results suggest the population of Palm Warbler in Canada has experienced a large increase since 1970. There are two subspecies of Palm Warbler, the western pale-coloured and the eastern brightly coloured subspecies (Wilson 2013), both of which are generally combined in surveys and both of which show similar population trends.
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis
Additional information on: Christmas Bird Count (CBC)
Additional information on: Atlas of the Breeding Birds of Ontario
