Comments: BREEDING: Breeds in cool, wooded swamps, ponds and slow-moving rivers; thickets of bogs, and rivers bordered with willow (SALIX) and alder (ALNUS, Godfrey 1986, Peck and James 1987). Regional habitats differ slightly. Throughout Canada and Alaska, nests primarily in spruce (PICEA) bogs, along alder-and willow-bordered rivers; also along lakes, swamps, and wet woodlands (Godfrey 1986). However, on islands off Newfoundland, known to nest in areas without standing water and where understory is less dense than on mainland (Vassollo et al.1982).
In New York state, breeds in hardwood swamps dominated by Red Maple (ACER RUBRUM) on the Great Lakes Plain, in Eastern Hemlock (TSUGA CANADENSIS)-northern hardwood swamps on the Allegheny Plateau, and in spruce-tamarack (LARIX)-balsam (ABIES) swamp valleys and uplands of the Adirondacks and Tug Hill Plateau (Eaton 1988). In Pennsylvania, found in RHODODENDRON swamps and a variety of wooded wetland types (Gross 1992). In Massachusetts, nests in locally in red maple swamps and white cedar and red maple swamps (Viet and Petersen 1993). In West Virginia, nests along rhododendron-bordered mountain streams, in spruce swamps and northern mixed forest to beech (FAGUS)-maple (ACER) forest (Brooks 1944).
Where sympatric with Louisiana Waterthrush, nests in areas with more forbs and ferns, with significantly more moss cover, hummocks, and conifers and with a higher density of shrubs; significantly more Eastern Hemlock and alder in Northern Waterthrush territories (Craig 1985).
NONBREEDING: Found mainly in damp tropical lowland forest, edges of pools and streams, mainly below 1,500 m. Mangroves (RHIZOPHORA, AVICENNIA, LABUNCULARIA) provide key habitat throughout much of range (Stotz et al. 1996, Bond 1971, Wetmore et al. 1984, Binford 1989, Lefebvre et al. 1992, Wunderle and Waide 1993). In Costa Rica, also found in open second growth or at wet spots in trails or roads (Stiles and Skutch 1989 Blake and Loiselle 1992). In northeast Nicaragua, in rain forest adjacent to pine habitat (Howell 1971). Tends to avoid disturbance, but may do well in second-growth tropical forest, edges, or woodlots (Ehrlich, et al. 1988).
Throughout its winter range found mainly below 1500 m (Curson et al. 1994). Highest recorded elevation in Columbia 3000m (Hilty and Brown 1986). In Costa Rica, ranges from lowlands to 1500 m, rarely higher, on both slopes, often extremely abundant in September along Caribbean coast; most numerous in Caribbean lowland and mangroves along the Pacific coast (Stiles and Skutch 1989). In Belize, most numerous in mangroves and gallery forest (Eaton 1995); occurs sparingly in cropland of cacao, rice, and citrus fruits (Robbins et al. 1992). In the West Indies, most often near the border of standing water, primarily saline and brackish, in or near mangroves and coastal scrub forest (Raffaele et al. 1998).
MIGRATION: Prefers damp woodlands with standing water, thick cover along streams, in marshes, and by stagnant pools, but is also found on lawns and in hedgerows and thickets (Winkler et al. 1992).