Plebejus icarioides fenderi

Macy, 1931

Fender's blue

Fender's blue is an endangered of lycaenid to the Willamette Valley of Oregon, United States. It was federally listed as endangered in 2000. numbers declined to fewer than 1,500 individuals in the 1990s but have recovered to 25,000–30,000 through targeted conservation efforts combining scientific research and management. The butterfly engages in a mutualistic relationship with ants, where larvae produce sugary secretions in exchange for protection from .

Pronunciation

How to pronounce Plebejus icarioides fenderi: //plɛˈbiː.dʒəs ɪˌkær.iˈɔɪ.diːz ˈfɛn.dɛ.ri//

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Habitat

Found in upland prairie and oak savanna in the Willamette Valley. These early-successional habitats are maintained by periodic disturbance. The specifically requires patches of its plant, Kincaid's lupine (Lupinus sulphureus kincaidii), which is also federally endangered. Habitat quality is linked to the presence of mutualistic that tend butterfly larvae.

Distribution

to the Willamette Valley of western Oregon, United States. Historical range included prairie and oak savanna patches across the valley; current distribution is restricted to scattered remnant patches due to habitat loss.

Diet

Larvae feed exclusively on Kincaid's lupine (Lupinus sulphureus kincaidii), a federally endangered plant . nectar on various flowering plants.

Host Associations

Lupinus sulphureus kincaidii - larval plantexclusive ; federally endangered
Formica - mutualistants tend larvae, protecting them from in exchange for sugary secretions

Life Cycle

Complete with , larva, pupa, and stages. Larvae are tended by ants, which protect them from and . The is , producing one per year. Adults are active in spring.

Behavior

Larvae engage in -tending , producing sugary secretions from specialized glands that attract and reward attending ants. This mutualism provides protection from natural enemies. are non-migratory and remain within or near their natal patches.

Ecological Role

Serves as a for and prey for . The larval- mutualism represents a notable example of interspecific cooperation in prairie . As a herbivore, it is tightly linked to the status of its endangered host plant.

Human Relevance

Subject of intensive conservation research and restoration efforts. Recovery from near-extinction demonstrates the effectiveness of combining scientific data with land management action. Used as a case study for endangered insect conservation; federal listing has driven habitat protection and management partnerships.

Similar Taxa

Plebejus icarioidesnominate ; Fender's blue distinguished by distribution (Willamette Valley ) and association with Kincaid's lupine
Plebejus acmonsimilar size and blue coloration; distinguished by range and plant associations

More Details

Conservation recovery

From fewer than 1,500 individuals in the 1990s, have increased to 25,000–30,000 through restoration including prescribed burning, control, and plant propagation. Research by Cheryl Schultz and colleagues demonstrated that properly timed prescribed fires can improve habitat quality and .

Taxonomic note

The has been treated under both Plebejus and Icaricia; GBIF currently recognizes Icaricia icarioides as the accepted name, with Plebejus icarioides as a synonym.