Alaskan Fritillary

boloria alaskensis

The Alaskan Fritillary (Boloria alaskensis) is a resilient, cold-adapted butterfly that graces the extreme environments of the far north. Thriving in the harsh, wind-swept alpine and arctic tundras of Alaska, northwestern Canada, and northeastern Siberia, this small lepidopteran has evolved unique survival strategies to withstand freezing temperatures. Because the summer season in these regions is incredibly short, the Alaskan Fritillary must act quickly to find mates and feed, making its brief aerial displays a spectacular sight for northern nature enthusiasts. Observing one of these hardy butterflies fluttering low over the rocky scree or basking in the rare arctic sun is a true testament to the tenacity of life in some of the most unforgiving climates on Earth.

生息地: Found in harsh alpine tundra, gravelly scree slopes, and moist arctic meadows, closely tied to areas where dwarf willows grow.

外見

This small butterfly features a wingspan of 3 to 5 centimeters. The upperside of its wings displays a muted, somewhat dusky orange-brown coloration, heavily patterned with dark brown or blackish blurred bands and spots, giving it a characteristic dingy or washed-out appearance that blends seamlessly with tundra gravel. The underside of the hindwing is intricately patterned with a blend of rusty red, ochre, and pale cream or grey bands, serving as excellent camouflage when it rests flat against rocks with its wings closed.

界Animalia門Arthropoda綱Insecta目Lepidoptera科Nymphalidae属Boloria

Alaskan Fritillary

カテゴリ

昆虫

レア度

Common

危険度

1/5 · 非常に低い

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おもしろい事実

Due to the extremely short arctic summers, it often takes two full years for a caterpillar to accumulate enough energy to pupate and emerge as an adult.

They practice lateral basking, tilting their wings to expose the darker underparts to the sun to rapidly warm up before taking flight.

To cope with cold, blustery winds, they rarely fly more than a few inches off the ground, keeping them safe within the boundary layer of warmer, calmer air.

特殊能力

They rest flat against dark stones or soil to absorb maximum solar radiation, raising their body temperature quickly in cold environments.

The caterpillars can survive multiple winters in a semi-frozen, dormant state of diapause before completing their metamorphosis.

They fly extremely low to the ground to avoid strong arctic winds that could blow them off course or into inhospitable terrain.

サイズと詳細

長さ: 1-2 cm
翼開長: 3-5 cm
体重: 0.0001-0.0003 kg
寿命: 1-2 年
Top Speed: 15 km/h
一度の産卵数: 50-150
抱卵期間: 7-14 日

食性と食事

As caterpillars, they feed exclusively on the leaves of low-growing arctic willows, while adults consume nectar from various tundra wildflowers.

年齢による違い: Caterpillars are leaf chewers restricted to dwarf willow host plants, whereas adults are nectar feeders equipped with a siphoning proboscis.