The frosted elfin is extripated from Canada and some U.S. states. In states such as New York, where the species remains, populations are not secure and are highly management dependent.
The Frosted Elfin has become globally rare and is extirpated in Canada. In the United States, there are no states where it is secure and it has become extirpated in some states. Much of the habitat has been lost in New York and small isolated colonies are unlikely to persist. Threats exist in many places and include high deer numbers and inappropriate habitat management. There are a few well known, protected, and adequately managed populations of the lupine feeding race. However, there may be fewer than five viable metapopulations in New York. This rare species has become highly management dependent.
The short-term trends indicate a decline of 10% to 30%.
Long-term trends indicate a large decline in the population of 75% to 90%, which is similar to or lower than nearby states.
Besides the destruction of habitats by development, threats that can quickly wipe out colonies. Threats include deer eating the foodplants (and eggs and larvae) and lack of appropriate habitat management, including applying herbicides to or disking utility right-of-ways. Mowing the foodplants before late June could eradicate or reduce an occurrence. Gypsy Moth (Lymantria dispar) spraying is also a potential threat, but the risk cannot be evaluated in the case of Bt (Bacillus thuringiensis - a bacterial biological control used on Gypsy Moth caterpillars). Depending on the application date, most larvae could be exposed, but their sensitivity is unknown. Habitat fragmentation may be the greatest threat in locations where potentially viable metapopulations still occur. Small isolated colonies are more likely to become extirpated because these populations sometimes fail to produce any adults in some years, due to deer browse or other variables, and subsequently are not recolonized. However, when populations are clustered, females can move between each of them and extirpations are often temporary.
All habitats require disturbance, such as fire or mowing, to impede succession. Where fire is used, unburned habitat patches, or refugia, are needed since Indigo (Baptisia spp.) feeders will usually have very high mortality in these areas. Although Lupine (Lupinus perennis) feeders, which pupate in the sand, may not have the same high mortality rates, they may leave the burned areas. Winter mowing is a proven management option, but the footprint of the machinery should be minimized in order to avoid crushing the pupae. Populations can be maintained for decades with mowing. Generally, management that works for the Karner Blue (Plebejus melissa samuelis) should work for the co-occurring Frosted Elfin, although the elfins might be more vulnerable to deer since the larvae feed on the lupine flowers. Shelter from wind and the proximity of trees may be important for Wild Indigo feeders, although the adjacent habitat may be brushy with few trees. Maintaining connectivity of colonies where they are clustered is important and is likely to be critical for long term persistence of populations. See Albanese et al. (2006) regarding habitat needs.
Research into the effects of prescribed burning on populations, especially lupine (Lupinus perennis) feeders is needed. Lupine feeders, which pupate in the sand, probably do not incur much mortality, but they apparently avoid recently burned areas. Research is also needed to determine how long the post-fire effects persist and if they can be mitigated. Additional information on the situations that encourage females to move between foodplant patches is also needed.
The key habitat feature is an abundance of the foodplant or, perhaps, many moderate-sized patches of the foodplant within a few hundred acres or more, and associated with remnant pine barrens, oak savannas, or dry oak forest. The grassland/herbaceous checkoff revers only to right of ways and airports not natural grasslands. There are two varieties of Frosted Elfins, one that feeds mostly on the flowers or seed pods of Wild Blue Lupine (Lupinus perennis), and another that feeds on leaves and stems of Wild Indigo (Baptisia spp.), primarily the native Baptisia tinctoria in New York. Populations will feed on only of these plants or the other, even when both types of plants are present. Lupine feeders occur in the Albany area, western New York, and on Long Island, while Wild Indigo feeders occur on Long Island. Frosted elfins are not likely to be found in stands of foodplants that have been isolated for a long period of time. This species nearly always occurs in clusters of populations that function as metapopulations and small habitat patches may be unoccupied in some years. Females disperse within the habitat and larvae can turn up in appropriate habitat where adults are not usually seen. The most typical habitats are utility right-of-ways and, at least in neighboring states, airport approach zones. A few populations of the lupine feeders occur partially in more natural settings in the Albany Pine Bush and the Rome Sand Plains. No populations of the Wild Indigo (Baptisia spp.) feeders are known to occur in natural settings in New York. Typical habitat features include a shrubby or partially open aspect and a high density of the foodplant, although the observations of Albanese et al. (2006) may not apply fully to the lupine feeders which seem more capable of using open grassland with no tall shrubs or trees. Nectar might also be an important habitat feature.
The lupine (Lupinus perennis) feeding variety is very widely scattered on sandplains, mainly in the upper Hudson Valley, but also in Oneida and Genesee Counties and on Long Island. Indigo (Baptisia spp.) feeders occur in the lower Hudson Valley and on Long Island.
The species as a whole has a very fragmented distribution from southern Wisconsin across Michigan, northern Indiana, northern Ohio, southern Ontario and New York, to southern New England, including a small portion of Maine (gone by 1900). It was, perhaps, most widespread in the Great Lakes region and from southern New England down the coast and Piedmont into the Carolinas, and from there extended very spottily westward, but not reaching the Mississippi Valley. There is a disjunct subspecies in Texas and adjacent areas.
This species is identifiable with any recent butterfly book. It is a rather large, very gray elfin, closely associated with lupine or wild indigo.
In the field, association with the foodplant is the first clue to the identity of this species. The combination of extensive gray beneath, tailed hindwing, and the relatively large size for an elfin are generally diagnostic for adults.
The best life stage for identification is the adult stage, although the larvae are identifiable by experts.
This species is almost always found within 50 feet of one of the foodplants.
The laval foodplant is Wild Indigo (Baptisia spp.) in some southeastern New York colonies and Wild Lupine (Lupinus perennis) elsewhere in the state. Both plants are used on Long Island, but no colony has been found to use both plants anywhere in the range of the species.
There is one annual generation with adults starting about late April to mid-May and often persisting into June. Wild Indigo (Baptisia spp.) feeders probably occur a bit later than lupine feeders in similar climates. At least with the Baptisia feeder, adult emergence is staggered and some fresh individuals can be seen for approximately one month. The egg stage is brief and the larval stage lasts for about a month, depending on the weather. Most larvae pupate by the end of June and most of the year is spent in that stage.
The time of year you would expect to find Frosted Elfin reproducing, larvae present and active, and pupae or prepupae present in New York.
Callophrys irus (Godart, )
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Information for this guide was last updated on: December 21, 2007
Please cite this page as:
New York Natural Heritage Program. 2019. Online Conservation Guide for Callophrys irus. Available from: https://guides.nynhp.org/frosted-elfin/. Accessed September 23, 2019.