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Threatened damselfly and dragonfly seen heading south
October 20, 2026
(threatened damselfly) observed October 8-13 in Arlington and Kensington. Tiger Spiketail (threatened dragonfly) recorded October 13. These species migrate southward in autumn; their October presence marks the annual fall movement to overwintering grounds.
Pollution-sensitive caddisflies found in Potomac tributaries
October 20, 2026
and net-spinning caddisfly larvae recorded through October 16 in tributaries including the Potomac River system. These pollution-sensitive larvae require dissolved oxygen above 6 mg/L and indicate that some stream reaches maintain acceptable water quality despite regional impairment designations.
Invasive virile crayfish spreading through watershed
October 20, 2026
(invasive) recorded October 18 in Derwood and September 18 in Fairfax Station. This aggressive non-native competes with native crayfishes and alters benthic communities through predation, with continuous recent observations showing its ongoing spread through watershed tributaries.
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