Its population has been rising with forest regeneration after massive 19th century deforestation. Regional declines have occurred where forest fragmentation has again predominated. These declines may be compounded by cowbird parasitism, of which M. varia is a frequent host. There is also evidence that pesticide usage has a negative effect on M. varia populations. No subspecies are presently recognized.
Warbler returns from southeastern Massachusetts.
Blake, C. H. and J. M. Cadbury. An old warbler. Burtt, E. H. 1980. Dunn, J. and K. Garrett. A field guide to warblers of North America.