Sympetrum
vicinum
(Yellow-Legged Meadowhawk)
Description:
Naiad-
This is a small naiad, with a length of 1/2 to 5/8 inch (12 to 15 mm). It is
mottled green and brown in color. The abdomen has several large hooks along
the top, and the last two abdominal segments have a single, large, rear-facing
spine on each side. This species has bigger eyes than other members of this
genus.
Adult- This
is a small dragonfly, with a length
of 1 3/16 to 1 3/8 inches (30 to 35 mm). The wings are mostly clear but have
a small patch of yellowish to orange clouding at the base of each hindwing.
Mature males are brownish black on
the face and thorax and have a red abdomen, while immature males have a yellow
thorax and a yellowish brown abdomen. Females
have a brown thorax and a brownish
red abdomen. As its common name implies, the legs of the adults are yellow.
Range:
This species has two separate
populations in North America. One is found from Ontario east to Nova Scotia,
extending south into the U.S. to Texas and Florida. The other population occurs
in British Columbia, Washington, and Idaho. In Idaho, it is found in the northern
half of the state.
Habitat:
This dragonfly can be
found near lakes and ponds with marshy borders.
Adult Flight Season:
Early August
to late October
Diet:
Naiad-
Naiads feed on a wide variety of aquatic insects, such as mosquito larvae, other
aquatic fly larvae, mayfly larvae, and freshwater shrimp. They will also eat
very small fish and tadpoles.
Adult-
The dragonfly will eat almost any soft-bodied flying insect including mosquitoes,
flies, small moths, mayflies, and flying ants or termites.
Ecology:
The naiads live in the
debris of the bottoms of lakes and ponds. They do not actively pursue prey but
wait for it to pass by, a strategy which affords them protection from other
predators. The naiads emerge, or make the transition to adult dragonflies, at
night. Adults fly from early August through October. This species flies later
in the fall than any other species in the Northwest, with observations as late
as October 29 in Idaho, and into November in Washington. The adults of this
species hunt flying insects from perches on rocks or bare branches. The Latin
name for this genus, Sympetrum, means "with rock" and refers to their habit
of basking on rocks to absorb heat early in the day. This dragonfly is extremely
abundant where it occurs, with large numbers of pairs flying and laying eggs
in tandem.
Reproduction:
The female flies with
the male still attached after mating (a position called "in tandem") and lays
her eggs near the shoreline of lakes and ponds by dipping the tip her abdomen
on the surface of the water. Large-mouth bass (Micropterus salmoides) have been
observed following mated pairs of dragonflies as they fly just above the surface,
and then eating them as they touch the surface to lay eggs.
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.