Ischnura
perparva
(Western Forktail)
Description:
Naiad-
This is a small naiad about �
inch (15 to 18 mm). It has the typical slender immature damselfly shape. The
color is uniform, ranging from olive to pale brown.
Adult-
This is a very small damselfly about
1 to 1 � inch (23 to 28 mm). The male has green stripes on the side of the thorax,
blue stripes on top of the thorax, and a black abdomen with segments eight and
nine colored bright blue. The females are light orange brown, becoming a pale
pruinose blue as they age.
Range:
This species is found from
southern British Columbia east to Manitoba and south to Texas and California.
In Idaho it is found throughout the state.
Habitat:
This damselfly is found
at ponds, lakes, and very slow-moving streams. It's often found at alkaline
ponds.
Adult Flight Season:
Early June -
October. In the lower elevation areas of the state it probably emerges as early
as late April.
Diet:
Naiad-
Naiads eat a wide variety of aquatic insects, including mosquito larvae, mayfly
larvae, and other aquatic fly larvae.
Adult-
Adults eat a wide variety of small soft-bodied flying insects, such as mosquitoes,
mayflies, flies and small moths. They will also pick small insects such as aphids
from plants.
Ecology:
The naiads of this species
are often found in mud bottoms rather than among aquatic plants. Their uniform
color serves as great camouflage for this habitat.
Reproduction:
The males set up territories
at choice breeding sites. Before females turn pruinose, males and females mate.
If a male approaches a female after her receptive period the female curves the
tip of her abdomen upwards in a characteristic posture and she is generally
left alone. After mating, the female oviposits singly, without the males attached,
in floating vegetation at ponds, lakes, and slow streams.
Conservation:
Populations
are widespread, abundant, and secure.
Status: | Unprotected nongame species |
Global Rank: | G5 |
State Rank: | S? |
References:
Corbet, P. S. 1999.
Dragonflies: Behavior and Ecology of Odonata. Cornell University Press, Ithaca,
New York, USA, 829pp.
Logan, E. R. 1967. The Odonata of Idaho. Unpublished M. S. thesis. University of Idaho, Moscow, Idaho, USA, 105 pp.
Needham, J. G. and M. J. Westfall. 1955. Dragonflies of North America. University of California Press, Berkely, California, USA, 615 pp.
Paulson, D. R. 1999. Dragonflies of Washington. Seattle Audubon Society, Seattle, Washington, USA, 32 pp.
Walker, E. M. and P. S. Corbet. 1975. The Odonata of Canada and Alaska, Vol. III. University of Toronto Press, Toronto, Ontario, Canada, 307 pp.