|
| |||||
|
|
Enallagma hageni (Hagen's Bluet)BC conservation rank: S3S4. Blue List. E. hageni is on the verge of dropping off the list of species of management concern. It is maintained on the Blue List largely because of its uncommonness over a relatively restricted area of BC and because we have difficulty in predicting, with confidence, where it might be found.Description: Closely related to E. ebrium. Male's appendages, fig. 4f. Female's segments 8 to 10 are entirely black on top. Length: male 30 mm, female 31 mm. Global Range: British Columbia east to Nova Scotia; south to Georgia, Virginia, Missouri, Nebraska and Montana (Westfall and May 1996). Faunal element: Transition (see Appendix 2). BC Distribution: From the central Cariboo area north to the Peace and Fort Nelson regions and west to the Bulkley Valley. Most often seen in the Cariboo and Prince George regions. Biology: An uncommon inhabitant of marshy lakes and ponds (Wm01-02, Wm04-07, Wf01); tends to prefer more acid situations than E. ebrium. For example, specimens were collected in mossy fens near Gaitaga Lake, Mackenzie (Wf06-07). BC flight period: late May to early September; most records from early July to early August. Management and protection considerations: In northern BC, E. hageni lives mainly in lakes used by fishermen and other recreational users. Disturbance by low-level recreation use is probably minimal in most areas studied, at least in the more remote lakes, although shoreline erosion from motorized craft may disturb breeding sites. Further inventory will document more localities close to more intense human activity. More precise knowledge of larval distribution along the shorelines of specific lakes in more-travelled areas would help decision-making regarding the health of E. hageni and other lacustrine species. Marina developments, pollution from powerboats, and popular swimming beaches all have potential impact on larval survival in these areas. Riparian forest damage by logging is also a potential disturbance.
Enallagma hageni Map 3. Frequency of records in British Columbia by NTS 1/50,000 mapsheet. |
Previous Table of Contents Next
 |
||
 |
Copyright © Royal
BC Museum |
|
