Black-and-white Warbler
(Mniotilta varia)

Summary

Picture of bird
© Dan Busby
For additional photos and vocalizations, visit Dendroica. (Link opens in a new window.)

The Black-and-white Warbler is a widespread and abundant species of Canada's woodlands, ranging from Alberta to the east coast. As indicated by results from the Breeding Bird Survey, its population in Canada has shown little change since about 1970. An occupant of a wide variety of woodland habitats, this species appears to have few conservation concerns at the moment. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.

Designations

Main designations for the species
DesignationStatusDateSubspecies, population
IUCN (Global)Least concern2018 
Wild Species (Canada)Secure2015 
Bird Conservation Region StrategyPriority Species2013 

Population status

Geographic area or populationPopulation change relative to ~1970ReliabilityStatus in relation to goal
CanadaLittle ChangeHighAt an Acceptable Level
 

Population estimate

Geographic area or populationPopulation estimate
Canada5,000,000 - 50,000,000 adults
 

Distribution maps

 

Migration strategy, occurrence

Long-distance migrant

Responsibility for conservation

Geographic areaResponsibility based on % of global population
CanadaHigh

General nesting period in Canada

Nesting period starts between mid-May and early June and ends between mid-July and late July, depending on the region. Before or after this period, the probability of an active nest is lower.
 

Conservation and management

Some authors consider the Black-and-white Warbler to be a sensitive, forest-interior species that may be susceptible to forestry activities (Freemark and Collins 1992). The increasing fragmentation occurring throughout its range and the increasing deforestation occurring in its southern wintering grounds may eventually have a negative impact on the Black-and-white Warbler (Kricher 2014). Currently however, the Black-and-White Warbler is an abundant species, and there is little conservation concern.

 

Bird conservation region strategies

Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:

  • conservation concerns (i.e., species vulnerable due to population size, distribution, population trend, abundance, or threats)
  • stewardship responsibilities (i.e., species that typify the regional avifauna or have a large proportion of their range or population in the sub-region)
  • management concerns (i.e., species that require ongoing management because of their socio-economic importance as game species, or because of their impacts on other species or habitats)
  • other concerns (i.e., species deemed a priority by regional experts for other reasons than those listed above or because they are listed as species at risk or concern at the provincial level)

Select any of the sub-regions below to view the BCR strategy for additional details.

BCRs, marine biogeographic units, and sub-regions in which the species is listed as a priority
RegionSub-region and priority type
Atlantic Northern ForestsAtlantic Northern Forests, sub-region and priority type: Atlantic, NS -- Stewardship
Atlantic Northern ForestsAtlantic Northern Forests, sub-region and priority type: Quebec -- Stewardship
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Ontario -- Stewardship
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Prairie and Northern -- Stewardship
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Quebec -- Stewardship
 

References