| 词条 | Dermacentor andersoni |
| 释义 |
| image = | image_width = 250px | regnum = Animalia | phylum = Arthropoda | classis = Arachnida | subclassis = Acari | superordo = Parasitiformes | ordo = Ixodida | familia = Ixodidae | genus = Dermacentor | species = D. andersoni | binomial = Dermacentor andersoni | binomial_authority = Stiles, 1908 | range_map = Dermacentor andersoni range map.svg }} Dermacentor andersoni, commonly known as the Rocky Mountain wood tick, is a hard tick, or member of the Ixodidae family, with three life stages including larvae, nymph and finally adult, or, more entomologically, imago. This tick is generally located in the northwest United States and southwest Canada along the Rocky Mountains. This tick is generally a vector for Colorado tick fever but can also be a vector for Rocky Mountain spotted fever and Tularemia.[1] During the larvae and nymph stages, the tick will not feed on humans, but during the adult stage, it will. However, the larvae and nymph forms will feed on small mammals, including dogs and other wildlife.{{cn|date=November 2018}} Prevention of infections associated with these ticks is based on control of exposure to the vector, including: wearing proper clothing when in woods/wet areas, and checking oneself thoroughly after returning home. Adult female ticks can feed for 5 to 15 days, thus it is very important to remove a tick if present.[2] Follow general tick removal tips. Life cycleDermacentor andersoni is a three-host tick with larval, nymph and adult life stages. During each life stage, the tick will take a single blood meal from a mammalian host. The duration of the life cycle varies between 1–3 years and is influenced by factors such as temperature, humidity and host availability. From the beginning of May through June, ticks' eggs are deposited on moist vegetation after the engorged female ticks drop off their host. The female lays approximately 2500–4000 eggs over 10–33 days.[3] Larval ticks hatch in early summer and begin questing for small mammalian hosts, seeking the stimuli of carbon dioxide, light, temperature and/or humidity. Larvae may cling to a passing host with the first pair of legs, climb upwards and then attach with their gnathostome to the neck or shoulder region. They feed from about 2–6 days. After becoming engorged, larvae drop off the host, and molt into nymphs. Nymphs remain dormant for extended periods of time unless stimulated by presence of a host. Nymph feeding behavior is like that of larvae. Nymphs and larvae do not feed on humans, but adults do. If they find a host and attach, the adult females feed continuously throughout that time, approximately 5–15 days. Males, on the other hand, feed for a shorter period and copulate with several, partially-fed females that are still on the host. Females will drop off the host when fully engorged and seek an area to oviposit. Both sexes die shortly after reproducing.[2]MorphologyDermacentor andersoni are hard ticks that are generally brown or reddish brown in color. Females have a distinct dorsal silver-gray ornamentation which turns more gray when the tick feeds, while males are spotted gray and white with no distinctive shield marking.[1] Their bodies are flat and pear-shaped, ranging from 2 to 5.3 mm in length, and have 11 festoons on their lower dorsal portion. This species is sexually dimorphic; females are generally larger and can increase their size nearly three times its original when fully engorged. This species is also polymorphic, with a lot of physical variation between individuals. Features that distinguish this species from other ticks include the number and size of goblets which are used for respiration on its spiracular plates; Dermacentor andersoni typically have 100-200 goblets on average.[1] This is only observable with a light microscopy. Disease transmissionDermacentor andersoni ticks are generally a vector for Colorado tick fever and can possibly be a vector for Rocky Mountain Spotted Fever and Tularemia.[3] However, the related species, Dermacentor varabilis is more susceptible to be a vector for Rocky Mountain Spotted Fever than D. andersoni.{{cn|date=November 2018}} As stated above, D. andersoni is generally located in the NW USA/ SW Canada whereas D. varabilis is generally located in the eastern USA. The border separating these two-different species could be considered to be the Missouri River. Thus, if one was to find a Dermacentor tick on themselves when they are west of the Missouri River, they would be at a higher risk for Colorado tick fever than Rocky Mountain Spotted Fever. The tick can become infected with a disease by feeding on a small mammal during its larvae or nymph stage and will generally be a vector in its nymph or adult stage.[4]See also
References1. ^1 2 {{cite web|title=Dermacentor andersoni|url=http://www.entomology.ualberta.ca/searching_species_details.php?b=Acari&c=7&s=31507|website=University of Alberta E.H. Strickland Entomological Museum|accessdate=April 19, 2017}} {{Tick-borne diseases}}{{Taxonbar|from=Q4298306}}2. ^1 {{cite web|title=Dermacentor andersoni|url=http://vetpda.ucdavis.edu/parasitolog/Parasite.cfm?ID=40|website=University of California, Davis|accessdate=April 19, 2017}} 3. ^1 {{cite journal|last1=Munyarubuga|first1=J|title=Dermacentor andersoni|journal=Animal Diversity Web|date=2012|url=http://animaldiversity.org/accounts/Dermacentor_andersoni/|accessdate=April 19, 2017}} 4. ^{{cite journal|last1=Eisen|first1=L|title=Climate change and tick-borne diseases: A research field in need of long-term empirical field studies|journal=International Journal of Medicinal Microbiology|date=2007|volume=298|pages=12–18|url=http://www.sciencedirect.com/science/article/pii/S1438422107001919|accessdate=April 19, 2017|doi=10.1016/j.ijmm.2007.10.004}} 4 : Ticks|Fauna of the Pacific Northwest|Animals described in 1908|Ixodidae |
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