Black Tern
(Chlidonias niger)

Summary

Picture of bird
© Jukka Jantunen (flickr.com/photos/jukka_jantunen)
For additional photos and vocalizations, visit Dendroica. (Link opens in a new window.)

The Black Tern breeds in loose colonies in fresh-water wetlands. It is uncommon but widespread in Canada. The species has declined by over 50% since 1970, and large declines prior to this time (and prior to widespread monitoring) are also likely. Black Terns continue to be threatened by the loss or degradation of the wetlands used for breeding and foraging. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.

Designations

Listing of the main designations for the species
DesignationStatusDateSubspecies, population
IUCN (Global)Least Concern2012 
Wild Species (Canada)Secure2010 
Bird Conservation Region StrategyPriority Species2013 

Population status

Geographic areaStatusReliability
CanadaLarge DecreaseHigh
 

Population estimate

Canada200,000 - 300,000 breeding birds
 

Distribution maps

 

Migration strategy, occurrence

Long-distance migrant

Responsibility for conservation of world population

CanadaModerate

Conservation and management

Black Terns prefer to breed in large wetland complexes (Naugle et al. 2000), and the loss and degradation of these habitats represents the single greatest threat to the species in Canada (Heath et al. 2009). However, Black Terns will use artificial or restored wetlands so that active management for the species can be effective if undertaken at an appropriate scale (Zimmerman et al. 2002). This species winters in marine habitats, especially off the Pacific Coast of Central America. Stocks of small pelagic fish declined precipitously around 1970 and remain low (Patterson et al. 1992); negative effects on Black Terns have not been documented but are likely (Heath et al. 2009).

 

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 Region - New Brunswick
Boreal Hardwood TransitionBoreal Hardwood Transition, sub-region and priority type: Ontario Region
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Ontario Region
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Prairie and Northern Region
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Quebec Region
Boreal Taiga PlainsBoreal Taiga Plains, sub-region and priority type: Prairie and Northern Region
Great BasinGreat Basin, sub-region and priority type: Pacific and Yukon Region
Lower Great Lakes/St. Lawrence PlainLower Great Lakes/St. Lawrence Plain, sub-region and priority type: Ontario Region
Lower Great Lakes/St. Lawrence PlainLower Great Lakes/St. Lawrence Plain, sub-region and priority type: Quebec Region
Northern Pacific RainforestNorthern Pacific Rainforest, sub-region and priority type: Pacific and Yukon Region
Northern RockiesNorthern Rockies, sub-region and priority type: Pacific and Yukon Region
Northwestern Interior ForestNorthwestern Interior Forest, sub-region and priority type: Pacific and Yukon Region
Prairie PotholesPrairie Potholes, sub-region and priority type: Prairie and Northern Region
Taiga Shield and Hudson PlainsTaiga Shield and Hudson Plains, sub-region and priority type: Ontario Region
 

References