Treeline Emerald

Somatochlora sahlbergi

General Status Rank: 
May Be At Risk
ELCODE: 
IIODO32200
Common Name: 
Treeline Emerald
Scientific Name: 
Somatochlora sahlbergi
Naming References: 
HMW1
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Taxonomy
Group: 
Odonate (Dragonfly)
Kingdom: 
Animalia
Phylum: 
Arthropoda
Class: 
Insecta
Order: 
Odonata
Family: 
Corduliidae
References: 
HMW1
Habitat
Larvae and adults: deep, cold lakes with aquatic moss (BMW1). The Treeline Emerald generally occurs within 100 km of the latitudinal treeline and within 300 m of the altitudinal treeline (Cannings and Cannings 1997) and is associated with relatively deep, cold water with aquatic mosses (Cannings and Cannings 1985).
References: 
BMW1
Distribution

Ecozones

Taiga Plains
References: 
RSC11

Distribution

less than 0.01
Score: 
AE
References: 
RSC11

Number of Occurrences

1
Score: 
A
References: 
RSC11

Area of Occupancy

Score: 
-
References: 
BMW1
Population

Population Size

Common
References: 
BMW1
Trends

Trends

Emergence: late June. Flight period: late June to mid-August.
References: 
BMW1
Threats

Intrinsic Vulnerability

Score: 
-
General Status Rank
Rank: 
May Be At Risk
Status Rank Description: 
Strong evidence for a very restricted Beringian distribution. The Beringian pattern includes confinement to the non-glaciated (during the Wisconsin) portion of Alaska, Yukon, and the Northwest Territories. Interestingly, this species is associated with the more open habitats that were presumably characteristic of the former steppe-tundra, now largely replaced by boreal forest. Hybrids with S. albicincta and S. hudsonica are known from northern Yukon and a hybrid with the latter species has been reported from Reindeer Station in the Northwest Territories.
S Rank: 
S1
Decision Process Description: 
Draft rank by P. Catling in 2005. Reviewed in 2010, no change. Reviewed in 2015, no change. Reviewed in 2020, no change.
Last Updated: 
November 25, 2023

References

Area of Occupancy

  • Cannings, Sydney G., Cannings, Robert A. (1997) Dragonflies (Odonata) of the Yukon. Biological Survey of Canada (Terrestrial Arthropods) Insects of the Yukon pp 169-200 - BMW1 Return

Ecozones

  • Catling, P. (2003) Dragonflies (Odonata) of the Northwest Territories - Status ranking and preliminary atlas. Unpublished report Suzanne Carriere's office - RSC11 Return

Habitat

  • Cannings, Sydney G., Cannings, Robert A. (1997) Dragonflies (Odonata) of the Yukon. Biological Survey of Canada (Terrestrial Arthropods) Insects of the Yukon pp 169-200 - BMW1 Return

Naming

  • Cannings, Robert A. (2001) Personal Communication. Curator of Entomology, Royal British Columbia Museum - HMW1 Return

Number of Occurrences

  • Catling, P. (2003) Dragonflies (Odonata) of the Northwest Territories - Status ranking and preliminary atlas. Unpublished report Suzanne Carriere's office - RSC11 Return

Population Size

Cannings, Sydney G., Cannings, Robert A. (1997) Dragonflies (Odonata) of the Yukon. Biological Survey of Canada (Terrestrial Arthropods) Insects of the Yukon pp 169-200 - BMW1 Return

Range Extent

  • Catling, P. (2003) Dragonflies (Odonata) of the Northwest Territories - Status ranking and preliminary atlas. Unpublished report Suzanne Carriere's office - RSC11 Return

Short Term Trends

  • Cannings, Sydney G., Cannings, Robert A. (1997) Dragonflies (Odonata) of the Yukon. Biological Survey of Canada (Terrestrial Arthropods) Insects of the Yukon pp 169-200 - BMW1 Return

Taxonomy

  • Cannings, Robert A. (2001) Personal Communication. Curator of Entomology, Royal British Columbia Museum - HMW1 Return