Pantala
flavescens
(Wandering Glider)
Description:
Naiad-
This is a medium to large naiad with a length of 15/16 to 1 1/16 inches (24
to 26 mm). It is pale green with light brown markings. There is a large, rear-facing
spine on each side of the last abdominal segments, but there are no hooks on
the back, as some naiads have.
Adult- This
is a medium to large dragonfly with a length
of 1 3/4 to 2 inches (44 to 50 mm), with a fairly wide abdomen. The thorax and
abdomen are orange to brown, and there are no markings. Each hindwing is almost
triangular in shape, with the broadest part at the base where it attaches to
the body.
Range:
This is the world's most
widely distributed dragonfly. It occurs worldwide between 400 N and 400 S latitude,
and is the only dragonfly with such a large distribution. It is most common
in tropical and subtropical regions with highly seasonal rainfall. In Idaho,
it occurs at seasonal ponds on the Snake River Plain.
Habitat:
This dragonfly can be
found near seasonal ponds.
Adult Flight Season:
It has only been observed to fly in August in Idaho, but it most
likely flies over a longer season.
Diet:
Naiad-
The 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 small fish and tadpoles.
Adult-
The dragonfly eats small flying insects, especially mosquitoes which also use
seasonal ponds. They also gather in swarms to feed on flying ants and termites.
Ecology:
The naiad swims actively
about in pursuit of prey, an unusual trait for naiads of this family. Because
they make little effort to conceal themselves when foraging, the naiads are
very vulnerable to predators such as fish. Luckily, the seasonal ponds in which
they live rarely contain many fish and the naiads do well. They have voracious
appetites and this results in quick maturation (40 to 60 days, depending on
water temperature and availability of prey). They emerge as adults synchronously,
and the adults migrate using thermals in the atmosphere. In Idaho, the naiads
have been observed to emerge in early August, indicating that the migratory
adults arrived to breed in June. The adults migrate around the world in search
of seasonal ponds to reproduce, traveling hundreds or even thousands of miles.
The abdomen of the adult can store large amounts of fat that is used as energy
for long-distance travel. Adults have even been seen perching on ships far out
at sea. The adult Wandering Glider often forages in large swarms, and one of
the most remarkable reports of such a swarm was of a cloud of Wandering Gliders
that covered 13 square miles (34 square kilometers)! This is one of the few
dragonflies that will remain on the wing during heavy rain, and in India, its
arrival is said to herald the coming of the monsoons.
Reproduction:
After males and females
mate, the female flies with the male attached (in tandem), to lay her eggs,
generally in seasonal ponds. However, this dragonfly often mistakes the finishes
on shiny new cars for water and lays eggs on them as well, a most unfortunate
choice for the hatching naiads.
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.