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Marsh Wren, Robert Taylor
Photo © Robert Taylor

Photo: Robert Taylor
Breeding evidence - Marsh Wren
Breeding evidence
Relative abundance - Marsh Wren
Relative abundance
Probability of observation - Marsh Wren
Probability of observation

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Marsh Wren
Cistothorus palustris
Landscape associations:

Click on plot to view table of mean abundance
Conserv. status:
SRANK: Abundant Breeder (S5B)
Number of squares
ConfirmedProbablePossiblePoint counts
39 121 544 742
Long-term BBS trends
RegionYearsTrend (conf. interv.) Reliab.
Manitoba1970 - 2015 1.58 (0.024 - 3.08)High
Canada1970 - 2015 1.25 (-0.224 - 2.37)Medium

Mean abundance (number of birds detected per 5 min. point count) and percentage of squares occupied by region

Bird Conservation Regions [abund. plot] [%squares plot]
Arctic Plains and MountainsBoreal Hardwood TransitionBoreal Softwood Shield
Abund.%SquaresAbund.%SquaresAbund.%Squares
0.00% 0.0827% 0.071%
Boreal Taiga PlainsPrairie PotholesTaiga Shield and Hudson Plains
Abund.%SquaresAbund.%SquaresAbund.%Squares
0.1723% 0.2764% 0.00%

Characteristics and Range The Marsh Wren's complex but unmusical song is a summer feature of Manitoba's larger, deep-water marshes. Though usually well concealed in tall emergent vegetation, this wren may pop up briefly onto an exposed perch to inspect an intruder, allowing good views of its relatively long bill, whitish eye-line, and frequently cocked tail. The Marsh Wren occurs in a patchy range across the U.S.A. and southern Canada, excluding a large portion of the southeastern states. BBS data show it reaching peak abundance in the eastern half of the Prairie Potholes. The northern range extremity is near the Alberta-British Columbia border, almost reaching the Northwest Territories. Eastern and western populations may be distinct species, with a breeding-range divide lying between Saskatchewan and Nebraska (Kroodsma and Verner 2013). The winter range includes much of Mexico, milder portions of the western U.S.A. northward to extreme southwestern British Columbia, and coastal regions of the eastern U.S.A. from the Gulf States and peninsular Florida to Chesapeake and Delaware Bays.

Distribution, Abundance, and Habitat Atlas records are concentrated in the Prairie Potholes and secondarily the southern Boreal Taiga Plains, with localized occurrence in the Boreal Hardwood Transition and minimally in the Boreal Softwood Shield.Possible or probable breeding records in 18 squares from the Bloodvein River and the Porcupine Hills north to the Leaf Rapids area, extend the range described in The Birds of Manitoba northward by 500 km, although this species is likely to occur in low density and perhaps erratically this far north. Peak abundance was detected around Lake Manitoba and southern Lake Winnipegosis and in extreme southwestern Manitoba. BBS analysis shows a robust, long-term increasing trend in the Prairie Potholes, including southwestern Manitoba, partly offset by decreases in neighbouring regions including southeastern Manitoba. These changes probably reflect long-period variations in moisture levels, with predominantly wet conditions across southern Manitoba from the 1990s to the present. The key habitat feature is large stands of cattails and other tall emergent vegetation, often in deep-water sections of marshes, bounded by open water. As well as natural wetlands, the Marsh Wren often inhabits strips of cattails at the edges of sewage lagoons.

Trends, Conservation, and Recommendations Overall conservation concern for this species is low, as supported by BBS trends in the core range. The Marsh Wren doubtless benefits from management of marshes for waterfowl production. Managed marsh impoundments are likely of particular importance in prolonged drought periods, when some boreal marshes may also increase in importance. While recent wet years and the proliferation of invasive cattails have combined to assure abundant habitat for Marsh Wrens, the reduction of ongoing wetland drainage and fragmentation remains an important long-term goal for conservation of this and many other species.

Peter Taylor

Recommended citation: Taylor, P. 2018. Marsh Wren in Artuso, C., A. R. Couturier, K. D. De Smet, R. F. Koes, D. Lepage, J. McCracken, R. D. Mooi, and P. Taylor (eds.). The Atlas of the Breeding Birds of Manitoba, 2010-2014. Bird Studies Canada. Winnipeg, Manitoba http://www.birdatlas.mb.ca/accounts/speciesaccount.jsp?sp=MAWR&lang=en [12 Dec 2018]

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