New York Natural Heritage Program
Blackwater Bluet
Enallagma weewa Byers, 1927

Threats [-]
Any activity which might lead to water contamination or the alteration of natural hydrology could impact Blackwater Bluet populations (NYS DEC 2006). Such threats might include roadway and agricultural run-off, ditching and filling, eutrophication and nutrient loading from fertilizers, herbicides, and septic systems, changes in dissolved oxygen content, and development (NYS DEC 2006). Groundwater withdrawal is a potential threat in lentic habitats on Long Island (New York Natural Heritage Program 2011). The introduction of grass carp is also a threat to coastal plain ponds on Long Island (New York Natural Heritage Program 2011b). In addition, both emergence rates and/or species ranges may shift for odonate species as a result of climate change (Kalkman et al. 2008).

Conservation Strategies and Management Practices [-]
Any efforts to reduce roadway and agricultural run-off, eutrophication, development of upland borders to ponds and resulting increased groundwater withdrawal, invasive plant and animal species, trampling of vegetation from recreation, and ditching and filling activities should be considered when managing for this species (NYS DEC 2006, White et al. 2010). Maintenance or restoration of native shoreline vegetation and surrounding upland habitat should benefit this species, as females in this genus require native emergent vegetation for successful reproduction and spend much of their time in upland habitats away from the breeding pond (Gibbons et al. 2002, White et al. 2010).

Research Needs [-]
Further inventory is needed to define the extent of populations of Blackwater Bluets in New York, and additional survey work in streams, rivers, and coastal plain ponds on Long Island could reveal new populations. In addition, research is required to understand the habitat requirements of this species, and to create appropriate management guidelines for its persistence in known locations (NYS DEC 2006).