Pteronarcella regularis

occurs (regularly, as a native taxon) in multiple nations

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: (200,000-2,500,000 square km (about 80,000-1,000,000 square miles)) Range includes the Coast, Cascade, Northern Rocky and Sierra Nevada Mountains as far as Alaska and Alberta (Stewart and Oswood, 2006).

Habitat Type: Freshwater

Comments: It is common in creeks and small rivers throughout its range (Gaufin et al., 1972).

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 21 - 80

Comments: Gaufin et al. (1972) cite Montana distribution as Flathead (Middle Flathead River, North Fork Flathead River, McDonald Creek), Glacier (Cutbank River, Lake Josephine), Lake (North Lost Creek, Swan River), and Lincoln (Murphy Lake outlet) Cos. In California, Jewett (1960) cited Susan R. Camp in Lassen Co. Nelson and Hanson (1971) utilized specimens from California (Shasta Springs, Siskiyou Co.), Oregon (Nehalem River northeast of Elsie; tributary of Mary's River, southwest of Philomath), and Washington (Olympia).

Adults emerge from April to June (Gaufin et al., 1972).

Canada

Rounded National Status Rank: N3 - Vulnerable

United States

Rounded National Status Rank: N3 - Vulnerable

Rounded Global Status Rank: G3 - Vulnerable

Reasons: A species restricted to the Coast, Cascade and Sierra Nevada Mountains of Alberta, Alaska, California, Nevada, Oregon and Washington. Known from >30 or 40 occurrences; many these sites are susceptible to logging and other landscape changes.