Geographic Range
Rhopalosiphum cerasifoliae
, the chokecherry aphid, is native to the Nearctic region. Its range extends across
the United States and the southern half of Canada.
Habitat
Rhopalosiphum cerasifoliae
is found in temperate regions, wherever its host plants grow. Its primary host,
chokecherry
, can be found in grasslands, along riversides, and in forests. Its secondary hosts,
including several species of bulrush of the genus
Scirpus
, grow in marshes and along rivers and lake shores.
- Habitat Regions
- temperate
- terrestrial
- Terrestrial Biomes
- savanna or grassland
- forest
- Wetlands
- marsh
- Other Habitat Features
- riparian
Physical Description
Like all
aphids
,
Rhopalosiphum cerasifoliae
has a round, soft body, with a pair of cornicles that secrete fluid at the end of
the abdomen.
Rhopalosiphum cerasifoliae
averages 2.25 mm in length. The apterous (wingless) female forms are pale green in
color, with a dark green mid-dorsal line on the thorax. Alate (winged) females have
a black head and body, while the prothorax is green. Nymphs resemble smaller versions
of adults.
- Other Physical Features
- ectothermic
- heterothermic
- bilateral symmetry
- polymorphic
Development
Eggs of
Rhopalosiphum cerasifoliae
hatch in the spring after overwintering on dormant host plants. First-generation
nymphs are plentiful in the middle of April and may grow through as many as four instars
within two weeks. Apterous (wingless) females first appear in the beginning of May,
while second-generation nymphs appear shortly thereafter by parthenogenesis. Adults
are most abundant on their primary host,
chokecherry
, from May to June. Alate (winged females) appear in mid-May, and these aphids migrate
to secondary hosts. Within 24 hours, they produce apterous females. By early June,
all colonies disappear from
chokecherry
and remain exclusively on secondary hosts for the rest of the summer and into the
fall. Males and gynoparae (parthenogenetic females that produce sexually reproductive
females) are produced on secondary hosts and migrate to
chokecherry
in the fall. On
chokecherry
, the gynoparae produce oviparae (egg-laying females that mate with males). Eggs are
laid continually on primary host plants from mid-October to November, at which time
the plants become dormant and the eggs overwinter.
- Development - Life Cycle
- metamorphosis
Reproduction
Little information is available regarding the mating systems of
Rhopalosiphum cerasifoliae
. Mating and parthenogenesis occur on the primary host,
chokecherry
. Only parthenogenesis occurs on the secondary host plants. Oviparae (egg-laying females
that mate with males) likely produce pheromones to attract mates.
Female aphids give birth to genetically identical live young via parthenogenesis throughout
the spring and summer. The number of live young produced by one female is unknown
for this species; however, in other
aphid
species, one female can produce hundreds or even thousands of offspring. Eggs are
laid continually from mid-October to November on the host plant,
chokecherry
, around buds and in the crooks of twigs. Females produce one or more eggs; the maximum
number of eggs has not been documented. The host plant becomes dormant during the
winter, during which time the eggs overwinter.
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- parthenogenic
- sexual
- asexual
- fertilization
- viviparous
- oviparous
Rhopalosiphum cerasifoliae
females likely provision their eggs. Additionally, by laying eggs on host plants,
females provide a safe overwintering environment and a suitable host plant for when
the eggs hatch in the spring. Live young produced by parthenogenesis join the colony
at birth and may interact with the female parent; however, the parents likely provide
little care, and the offspring develop independently.
- Parental Investment
-
pre-hatching/birth
-
provisioning
- female
-
provisioning
Lifespan/Longevity
Although little information specific to
Rhopalosiphum cerasifoliae
exists regarding lifespan and longevity, most
aphid
species live a few weeks to a month. The entire
R. cerasifoliae
colony dies out before the winter, and the eggs that overwinter repopulate the colony
in the spring.
Behavior
Rhopalosiphum cerasifoliae
lives in large colonies. Colonies can grow to great numbers in a short amount of
time, due to parthenogenesis. Groups of these aphids often colonize leaves, with the
leaves curling up as the aphids feed. Some forms of
R. cerasifoliae
are winged, typically the ones that migrate to and from secondary host plants.
Aphids
are generally known to be poor fliers, but can travel longer distances on air currents.
Home Range
Unwinged forms of
Rhopalosiphum cerasifoliae
remain on their host plants. Winged forms migrate from primary hosts to areas containing
secondary host plants, though the distance of this migration has not been documented.
It is likely that the secondary hosts are close to the primary host plants, as aphids
are poor fliers and some forms of
R. cerasifoliae
migrate back to the primary host plants to lay eggs in the fall.
Communication and Perception
While little information specific to
Rhopalosiphum cerasifoliae
exists regarding communication and perception, most aphid species use pheromones
to attract mates. During the reproductive stage of the aphid life cycle, egg-laying
females (oviparae) produce a pheromone to attract males.
Aphids
perceive their environment visually, typically with a preference for yellow surfaces.
As a host-specific aphid species,
R. cerasifoliae
likely finds host plants by detecting host-specific chemicals and odors. The main
olfactory organs in
aphids
are located in the antennae. Most
aphid
species also produce an alarm pheromone that alerts other aphids of a predator attack.
These chemicals are released in a droplet from the cornicles.
- Other Communication Modes
- pheromones
Food Habits
Like all
aphids
,
Rhopalosiphum cerasifoliae
feeds solely on plant phloem. It pierces the plant vessels to retrieve the sap. The
primary host of
R. cerasifoliae
is
chokecherry
, on which it feeds from April to June. After June, some members of the colony migrate
to secondary host plants. These secondary hosts include
Scirpus validus
in the Midwestern United States,
Scirpus acutus
in Washington and Idaho,
Eleocharis erythropoda
,
Scirpus atrovirens
, and
pin cherry
.
- Primary Diet
-
herbivore
- eats sap or other plant foods
- Plant Foods
- sap or other plant fluids
Predation
Many species of lady beetles (
Coccinellidae
) are avid predators of
aphids
. To
Rhopalosiphum cerasifoliae
in particular, lady beetles of the genus
Hippodamia
are predators, though many other
Coccinellidae
species probably prey on
R. cerasifoliae
as well.
Green lacewings
and
syrphid fly
larvae are generalist predators of aphids and likely prey on
R. cerasifoliae
. The mutualist ant,
Formica montana
, protects
R. cerasifoliae
from predators in return for honeydew produced by the aphids, which the ants farm.
Rhopalosiphum cerasifoliae
has little other defense from predators. Gathering in colonies may decrease predation
pressure on individuals. When threatened, many aphid species release an alarm pheromone
that alerts other aphids in the colony of an attack. In response to the alarm pheromone,
aphids exhibit escape behaviors such as dropping off the host plant or walking away.
Ecosystem Roles
The primary host of
Rhopalosiphum cerasifoliae
is
chokecherry
. Large colonies feed exclusively on the phloem from these plants until June, when
the colonies disappear and some individuals migrate to secondary host plants, including
several species of bulrush (
Scirpus validus
,
Scirpus acutus
, and
Scirpus atrovirens
),
Eleocharis erythropoda
, and
pin cherry
.
Rhopalosiphum cerasifoliae
serves as prey to a variety of other insects, most notably
lady beetles
,
lacewings
, and
syrphid flies
. Like all
Aphididae
species,
R. cerasifoliae
hosts an endosymbiotic bacterium species,
Buchnera aphidicola
. This symbiosis is an obligate relationship for both species.
Buchnera aphidicola
produces essential amino acids that aphids do not get from their plant phloem diet,
while
Buchnera aphidicola
cannot survive outside the body of an aphid. The ant
Formica montana
is known to farm colonies of
R. cerasifoliae
in a mutualistic relationship.
Formica montana
eats the honeydew that
R. cerasifoliae
produces, while the ants in turn provide protection for the aphid colony.
Rhopalosiphum cerasifoliae
also has been documented living in one colony with other aphid species, particularly
Asiphonaphis pruni
.
- chokecherries ( Prunus virginiana )
- soft-stemmed bulrushes ( Scirpus validus )
- hard-stemmed bulrushes ( Scirpus acutus )
- green bulrushes ( Scirpus atrovirens )
- bald spike rushes ( Eleocharis erythropoda )
- pin cherries ( Prunus pensylvanica )
- bacteria ( Buchnera aphidicola )
- prairie mound ants ( Formica montana )
Economic Importance for Humans: Positive
There are no known positive effects of Rhopalosiphum cerasifoliae on humans.
Economic Importance for Humans: Negative
While many
aphid
species act as agricultural pests on their host plants,
Rhopalosiphum cerasifoliae
is not considered to be a serious pest on
chokecherry
.
Rhopalosiphum cerasifoliae
has the potential to damage
chokecherry
plants and its secondary host plants when present in large numbers, though severe
occurrences have yet to be recorded.
Conservation Status
Rhopalosiphum cerasifoliae has no special conservation status.
Additional Links
Contributors
Angela Miner (author), Animal Diversity Web Staff, Elizabeth Wason (editor), Animal Diversity Web Staff, Leila Siciliano Martina (editor), Texas State University.
- 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).
- terrestrial
-
Living on the ground.
- tropical savanna and grassland
-
A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia.
- savanna
-
A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome.
- temperate grassland
-
A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands.
- forest
-
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
- marsh
-
marshes are wetland areas often dominated by grasses and reeds.
- riparian
-
Referring to something living or located adjacent to a waterbody (usually, but not always, a river or stream).
- 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.
- polymorphic
-
"many forms." A species is polymorphic if its individuals can be divided into two or more easily recognized groups, based on structure, color, or other similar characteristics. The term only applies when the distinct groups can be found in the same area; graded or clinal variation throughout the range of a species (e.g. a north-to-south decrease in size) is not polymorphism. Polymorphic characteristics may be inherited because the differences have a genetic basis, or they may be the result of environmental influences. We do not consider sexual differences (i.e. sexual dimorphism), seasonal changes (e.g. change in fur color), or age-related changes to be polymorphic. Polymorphism in a local population can be an adaptation to prevent density-dependent predation, where predators preferentially prey on the most common morph.
- 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.
- iteroparous
-
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
- seasonal breeding
-
breeding is confined to a particular season
- parthenogenic
-
development takes place in an unfertilized egg
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- asexual
-
reproduction that is not sexual; that is, reproduction that does not include recombining the genotypes of two parents
- fertilization
-
union of egg and spermatozoan
- internal fertilization
-
fertilization takes place within the female's body
- viviparous
-
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
- oviparous
-
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
- motile
-
having the capacity to move from one place to another.
- colonial
-
used loosely to describe any group of organisms living together or in close proximity to each other - for example nesting shorebirds that live in large colonies. More specifically refers to a group of organisms in which members act as specialized subunits (a continuous, modular society) - as in clonal organisms.
- visual
-
uses sight to communicate
- chemical
-
uses smells or other chemicals to communicate
- pheromones
-
chemicals released into air or water that are detected by and responded to by other animals of the same species
- visual
-
uses sight to communicate
- chemical
-
uses smells or other chemicals to communicate
- herbivore
-
An animal that eats mainly plants or parts of plants.
References
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