Geographic Range
Sympetrum vicinum
is widely distributed throughout much of North America. The species occurs throughout
the most of the U.S. except the desert Southwest, the northern Rocky Mountains, peninsular
Florida and the Gulf coasts of Louisiana and Texas. It's found in southeastern and
extreme southwestern Canada.
Habitat
Sympetrum vicinum
inhabits marshes, lakes, ponds and bogs in areas that are usually somewhat wooded.
The ponds that this species inhabits must be permanent and have slow flowing water.
- Habitat Regions
- temperate
- freshwater
- Aquatic Biomes
- lakes and ponds
- rivers and streams
Physical Description
Sympetrum vicinum
has a dull yellow face, which in males becomes reddish toward maturity. The pterothorax
is red on the front while the sides are an olive color. This species has reduced venation
with hyaline (clear, colorless) wings with a yellow base. The abdomen is slender and
red, and is lighter than in other species of
Sympetrum
.
- Other Physical Features
- ectothermic
- heterothermic
- bilateral symmetry
- Sexual Dimorphism
- sexes colored or patterned differently
Development
Eggs hatch in the early spring of the following year after overwintering. They emerge when the water temperature reaches about 10 degrees Celsius. At the beginning of the first free-living larval stadium (period between one molt and the next) ecdysis (shedding of the outer skin) occurs. This larval stage is restricted to the spring and summer seasons. After molting, the larva increases in size and changes in coloring can occur. This process takes place over about an hour.
After going through a series of molts
S. vicinum
begins showing signs of becoming an adult dragonfly. These signs include: setae on
the dorsum of the head, contraction of the labium and microtrichia on the wings. It
can take an individual anywhere from one to seven weeks to become ready to emerge
as an adult. The first adults to emerge of this species are seen in late June. Once
an individual has become an adult, it has two main goals: to eat and to mate. The
pre-reproductive stage in
S. vicinum
can last anywhere from 30-87 days, depending on the latitude where they are found.
Once they reach sexual maturity, individuals seek a mate, lay eggs and die soon afterward.
- Development - Life Cycle
- metamorphosis
Reproduction
Once sexual maturity has been reached males begin looking for mates. When a female
is found and the male determines visually and physically that she is of the same species,
copulation will take place. The male places sperm into the female's genital tract.
The eggs are laid in summer and "complete katatrepsis" (embryo revolution) occurs
in autumn. The insects then pass the winter as fully formed embryos. Once oviposition
has taken place the sexes separate and stop flying in tandem.
- Key Reproductive Features
- seasonal breeding
- sexual
- fertilization
- oviparous
There is no parental investment beyond laying of eggs.
- Parental Investment
-
pre-fertilization
-
protecting
- female
-
protecting
Lifespan/Longevity
The life cycle of this dragonfly is approximately one year.
Behavior
Sympetrum vicinum
is a nonterritorial species. After mating, the male will keep hold of the female
and they fly as a pair during oviposition. Dominance hierarchies have also been observed
in
S. vicinum
. Disputes between competing males lead to an orderly ranking of individuals. Behavior
can be affected by temperature. If an individual begins the morning in the shade
it sometimes takes six extra hours for the insect's first flight of the day.
- Key Behaviors
- flies
- diurnal
- motile
- hibernation
- dominance hierarchies
Communication and Perception
Odonates
have highly developed sight. The large compound eyes are used to capture prey.
- Communication Channels
- chemical
- Perception Channels
- visual
- infrared/heat
- tactile
- chemical
Food Habits
The larvae of this species are sprawlers. They lie on pond bottoms and attack prey as it comes into their immediate area. The family of dragonflies that includes S. vicinum , Libellulidae , are all perching adults. This means that they sit and wait for their prey (small flying insects) to fly by. Once they see it, they take off and pursue it, with an amazing success rate of 97%. The study recording these data was done through keen observations from binoculars and video recorders. Trays were set out within patches of Eleocharis to maximize the test results by limiting the potential landing site area within two artificial ponds.
Foods eaten by larval
S. vicinum
include medium-sized water fleas and relatives of
Cladocera
;
Ostracoda
;
Oligochaeta
; burrowing and climbing flies of the family
Chironomidae
and
Ceratopogonidae
.
Sympetrum vicinum
will also eat larva of smaller dragonfly species.
- Primary Diet
-
carnivore
- insectivore
- eats non-insect arthropods
- Animal Foods
- insects
- aquatic or marine worms
- aquatic crustaceans
- zooplankton
Predation
When spotted by predators the larvae form simply lies immobile. Large individuals,
when attacked by the snake
Regina alleni
will actually bite the snake's mouth, which makes the snake bleed. Usually the snake
will let go of the dragonfly larva. For some reason these snakes swallow dragonfly
larvae head first. It has also been hypothesized, but not documented, that individuals
may produce sounds to ward off predators.
Ecosystem Roles
Dragonflies help keep insect populations at a stable level.
Sympetrum vicinum
has a commensal relationship with the species mentioned below and are also parasitized
by certain species of mites. Parasitic
chironomid
fly larvae can be found on the back of the head, prothorax, wing sheaths and legs
of
S. vicinum
.
Spiroxys contortus
uses
S. vicinum
as an intermediate host (turtles are the definitive host).
Economic Importance for Humans: Positive
Dragonflies can be used to protect humans from
mosquitoes
and
blackflies
. One experiment has show that larval species of
Bradinopyga geminata
were able to destroy an entire population of mosquitoes within a 194-liter drum in
a matter of hours. Application of this method would allow pest control of mosquitoes
without the use of chemicals. Several studies have show that
Sympetrum
species are apparently immune to pollutants. This could possibly help humans, in
the long run, if we can develop ways to deal with pollutants if understood in detail.
- Positive Impacts
- research and education
- controls pest population
Economic Importance for Humans: Negative
Larva can sometimes deplete fish fry populations that fishermen want to culture.
Conservation Status
This species is secure and currently not of any conservation concern.
Additional Links
Contributors
Renee Sherman Mulcrone (editor).
Joshua Winchell (author), University of Michigan-Ann Arbor, Kerry Yurewicz (editor), University of Michigan-Ann Arbor.
- Nearctic
-
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- temperate
-
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
- freshwater
-
mainly lives in water that is not salty.
- marsh
-
marshes are wetland areas often dominated by grasses and reeds.
- swamp
-
a wetland area that may be permanently or intermittently covered in water, often dominated by woody vegetation.
- bog
-
a wetland area rich in accumulated plant material and with acidic soils surrounding a body of open water. Bogs have a flora dominated by sedges, heaths, and sphagnum.
- urban
-
living in cities and large towns, landscapes dominated by human structures and activity.
- suburban
-
living in residential areas on the outskirts of large cities or towns.
- estuarine
-
an area where a freshwater river meets the ocean and tidal influences result in fluctuations in salinity.
- ectothermic
-
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
- heterothermic
-
having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
- metamorphosis
-
A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- internal fertilization
-
fertilization takes place within the female's body
- oviparous
-
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
- diurnal
-
- active during the day, 2. lasting for one day.
- motile
-
having the capacity to move from one place to another.
- hibernation
-
the state that some animals enter during winter in which normal physiological processes are significantly reduced, thus lowering the animal's energy requirements. The act or condition of passing winter in a torpid or resting state, typically involving the abandonment of homoiothermy in mammals.
- dominance hierarchies
-
ranking system or pecking order among members of a long-term social group, where dominance status affects access to resources or mates
- chemical
-
uses smells or other chemicals to communicate
- visual
-
uses sight to communicate
- infrared/heat
-
(as keyword in perception channel section) This animal has a special ability to detect heat from other organisms in its environment.
- tactile
-
uses touch to communicate
- chemical
-
uses smells or other chemicals to communicate
- zooplankton
-
animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)
- carnivore
-
an animal that mainly eats meat
- insectivore
-
An animal that eats mainly insects or spiders.
References
Corbet, P. 1999. Dragonflies:Behavior and Ecology of Odonata . Ithaca, New York: Cornell University Press.
Emmitt, R. 2000. "Yellow-legged Meadowhawk" (On-line). Accessed March 20, 2002 at http://www.rlephoto.com/odes/yellow_legged-meadowhawk01.htm .
McMillian, V. 2000. Aggregating Behavior During Oviposition in the Dragonfly *Sympetrum vicinum* (Hagen)(Odonata:Libellulidae). The American Midland Naturalist , 144 no. 1: 11-18.
Merritt, R., K. Cummins. 1984. An Introduction to the Aquatic Insects of North America . Dubuque, Iowa: Kendall/Hunt Publishing Company.
Needham, J., M. Westfall, M. May. 2000. Dragonflies of North America . Gainesville, FL: Scientific Publishers.
Olberg, R., A. Worthington, K. Venator. 2000. Prey pursuit and interception in dragonflies. Journal of Comp. Physiology , 186: 155-162.
White, T., J. Weaver, R. Fox. 1980. Phoretic relationships between Chironomidae(Diptera) and benthic macroinvertebrates. EnN , 91: 69-74.