New York Natural Heritage Program
Mottled Duskywing
Erynnis martialis (Scudder, [1870])

Habitat [-]
Former habitat types in New York likely included a variety of dry brushy or scrubby areas or relatively open woodlands with abundant New Jersey Tea (Ceanothus americanus), although as with any species of the genus Erynnis, the possibility of some records being misidentifications should be considered. The current and recently extirpated locations for this species in the Northeast and mid-Atlantic region are mostly inland Pitch Pine (Pinus rigida) barrens. One current New York occurrence is in an alvar grassland. In Ontario, oak savannas and oak woodlands can provide suitable habitat for this species, and it is likely that this was an historical habitat type in New York. The persistence of this species probably requires the foodplant to occur in substantial patches over an area of at least a few hundred acres or containing a cluster of smaller habitats.

Associated Ecological Communities [-]
  • Coastal plain pond shore
    The gently sloping shore of a coastal plain pond with seasonally and annually fluctuating water levels. Plants growing on the pond shore vary with water levels. In dry years when water levels are low there is often a dense growth of annual sedges, grasses, and herbs. Submerged and floating-leaved aquatic plants, such as fragrant waterlily and pondweeds, may become "stranded" on the exposed shore. In wet years when the water level is high only a few emergents and floating-leaved aquatics may be noticeable. The vegetation of this pond shore community can change dramatically from one year to the next depending on fluctuations in groundwater levels.
  • Pitch pine-oak forest
    A mixed forest that typically occurs on well-drained, sandy soils of glacial outwash plains or moraines; it also occurs on thin, rocky soils of ridgetops. The dominant trees are pitch pine mixed with one or more of the following oaks: scarlet oak, white oak, red oak, or black oak.

Associated Species [-]
  • Broad-Lined Catopyrrha (Catopyrrha coloraria)