Rattus typically found in city sewer systems and other human related habitats are excellent hosts for . Seaports and other rat-infested areas are also common habitats for .usually inhabits tropical and subtropical habitats, although it has been reported in the temperate zone as well. is rarely found in cold areas since it requires a tropical/subtropical climate to pupate. Fleas are prevalent in many major cities. Species of
Fleas are nidiculous parasites; they live in the host's nest. Clothing, beds and couches make perfect homes for many of these fleas. Fleas only attach to the host while they are sucking blood; at other times they are free-living in the host's nest. (Brown, 1975; James and Harwood, 1969)
Fleas are holometabolous, which means they go through four life-cycle stages: egg (embryo), larva, pupa, and adult (imago). Eggs normally incubate for about two to twelve days. (Askew, 1977; Brown, 1975; James and Harwood, 1969)passes through three molts during the larval stage, which usually lasts about nine to fifteen days, but can last up to 200 days in unfavorable conditions. Next, the larva spins a silk cocoon where it remains until it is finished pupating. During the pupal stage the flea's development rate is greatly affected by its surroundings. Changes in temperature and humidity outside the cocoon can inhibit emerging for up to a full year.
No information is available on the mating systems of these fleas.
The ideal temperature range foris about 65 to 80°F. dislikes temperatures much higher than 80°F. Such temperatures are close to human body temperatures, therefore explaining why fleas leave the host when not feeding.
Fleas have a pygidium, a sensory organ on their dorsal side, which detects vibrations and air currents. Pupae use these signals to time their emergence from their cocoons. Not much is known about how these fleas communicate with one another. (Askew, 1977)
Adults of both sexes of Rattus rattus (Black Rat) and other mammals, including humans. obtains the host's blood through a set of external mouthparts, which consist of the following maxillary lacunae and an epipharynx. The purpose of each structure is to aid in the sucking up of blood. After biting, the fleas suck blood from a pool (telmophagy), unlike some other insects like mosquitoes that feed directly from the blood vessel (solenophagy).feed on blood. They bite
Piercing of the host's skin is achieved by the back and fourth action of the maxillary laciniae. After the skin is cut the epipharynx enters the wound and injects salvia. Saliva contains special chemicals, which keep the host's blood from coagulating. A canal formed by the maxillary laciniae and the epipharnyx then sucks up blood. Further down the gut a specialized organ called the proventriclus then breaks down blood cells enabling theto digest the blood meal. The average capacity of is 0.5 cubic millimeters.
Rattus and humans. Because of its parasitic nature, is a vector for pathogens such as plague bacilli, Yersina pestis, and murine typhus, Rickettsia typhi. Transmission of the pathogen occurs as bacteria enter the flea's gut and multiply rapidly. Soon the flea's proventriculus is blocked by a mass of bacteria and it cannot fill its stomach, causing the flea to search for a new host. After biting the host, the blood of an uninfected host mixes with bacteria in the flea's stomach; the flea expels infected blood back into the wound consequently, infecting a new host. goes from host to host infecting the uninfected. Hosts may also become infected either from consuming fecal matter or dead remnants of an infected .is a parasite of many mammalian species, including
Besides just being pesky when it bites, Yersina pestis, and the agent of murine typhus, Rickettsia typhi. Both diseases are a threat to humans and other animals that encounter them. In urban foci, the reservoir hosts of plague are usually species of Rattus, most commonly Rattus rattus. (Beaty and Marquardt, 1996; Beaver, et al., 1984; Brown, 1975; James and Harwood, 1969)is a vector of plague bacilli,
A study done in 1997 demonstrates that (Rutledge, et al., 1997)has evolved resistance to commercial insect repellents due to its long association with humans.
Allison Poor (editor), University of Michigan-Ann Arbor.
Janki Trivedi (author), University of Michigan-Ann Arbor, Teresa Friedrich (editor), University of Michigan-Ann Arbor.
living in landscapes dominated by human agriculture.
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.
an animal that mainly eats meat
Found in coastal areas between 30 and 40 degrees latitude, in areas with a Mediterranean climate. Vegetation is dominated by stands of dense, spiny shrubs with tough (hard or waxy) evergreen leaves. May be maintained by periodic fire. In South America it includes the scrub ecotone between forest and paramo.
having a worldwide distribution. Found on all continents (except maybe Antarctica) and in all biogeographic provinces; or in all the major oceans (Atlantic, Indian, and Pacific.
in deserts low (less than 30 cm per year) and unpredictable rainfall results in landscapes dominated by plants and animals adapted to aridity. Vegetation is typically sparse, though spectacular blooms may occur following rain. Deserts can be cold or warm and daily temperates typically fluctuate. In dune areas vegetation is also sparse and conditions are dry. This is because sand does not hold water well so little is available to plants. In dunes near seas and oceans this is compounded by the influence of salt in the air and soil. Salt limits the ability of plants to take up water through their roots.
particles of organic material from dead and decomposing organisms. Detritus is the result of the activity of decomposers (organisms that decompose organic material).
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
union of egg and spermatozoan
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
fertilization takes place within the female's body
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).
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.
having the capacity to move from one place to another.
This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
an organism that obtains nutrients from other organisms in a harmful way that doesn't cause immediate death
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
specialized for leaping or bounding locomotion; jumps or hops.
an animal that mainly eats blood
scrub forests develop in areas that experience dry seasons.
reproduction that includes combining the genetic contribution of two individuals, a male and a female
living in residential areas on the outskirts of large cities or towns.
uses touch to communicate
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).
Living on the ground.
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
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.
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.
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.
living in cities and large towns, landscapes dominated by human structures and activity.
movements of a hard surface that are produced by animals as signals to others
breeding takes place throughout the year
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Rutledge, L., R. Gupta, Z. Mehr. 1997. Evolution of repellent tolerances in representative arthropods. Journal of American Mosquito Control Association, 13: 329-334.