Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (extent of occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
The global population has not been quantified since the species was split.
This species has undergone a small or statistically insignificant increase over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). Note, however, that these surveys cover less than 50%.
Troglodytes aedon is distributed from southern Canada through the U.S.A. to Mexico. The subspecies martinicensis of Martinique (to France) went extinct around 1900 (del Hoyo et al. 2005); its equivalent on Guadeloupe (to France), guadeloupensis, has not been recorded since 1973 and is likely to also be extinct (Levesque and Mathurin 2008).
Text account compilers
Butchart, S., Ekstrom, J. & Khwaja, N.
BirdLife International (2019) Species factsheet: Troglodytes aedon. Downloaded from http://www.birdlife.org on 14/10/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 14/10/2019.