GEOGRAPHIC DIFFERENTIATION IN THE DEVELOPMENT OF AEDES SIERRENSIS (DIPTERA: CULICIDAE) IN NATURE

1980 ◽  
Vol 112 (2) ◽  
pp. 205-210 ◽  
Author(s):  
Robert G. Jordan
Keyword(s):  
Laboratory Data ◽  
Fourth Instar ◽  
Geographic Differentiation ◽  
Critical Photoperiod ◽  
Geographic Populations ◽  
Treehole Mosquito ◽  
Aedes Sierrensis

AbstractThe critical photoperiod for fourth instar diapause of the western treehole mosquito, Aedes sierrensis, varies among geographic populations. When reared together in the field at different latitudes, larvae from northern (ca. 45°N), central (ca. 39°N), and southern (ca. 33°N) populations all develop more rapidly through the early instars at more southerly latitudes. The order of pupation dates among the populations, however, depends on their critical photoperiods, and can be predicted from laboratory data on photoperiodism.

Biology of tree-hole mosquitoes: photoperiodic control of development in northern Toxorhynchites rutilus (Coq.)

1975 ◽  
Vol 53 (7) ◽  
pp. 889-893 ◽  
Author(s):  
William E. Bradshaw ◽  
Christina M. Holzapfel
Keyword(s):  
Rapid Growth ◽  
Fourth Instar ◽  
Photoperiodic Control ◽  
The Third ◽  
Winter Conditions ◽  
Tree Hole ◽  
Critical Photoperiod ◽  
Northern Portion ◽  
Toxorhynchites Rutilus ◽  
Short Days

Carnivorous larvae of the tree-hole mosquito, Toxorhynchites rutilus, were collected from the northern portion of their range. Long days were found to promote rapid growth and metamorphosis from egg to adult; short days retard development during the second and third instars and evoke diapause in the fourth. All larvae exposed continuously to long days from embryos to the third or fourth instar developed without entering diapause. Diapause-averting long days experienced earlier in development could be reversed in at least some individuals by subsequent short days. Among laboratory-reared larvae or those caught early in the fall, the critical photoperiod for the maintenance of diapause is around 13 h of light per day. Among larvae caught in midwinter, diapause is not maintained in all larvae at any photoperiod and in 50% or less of the larvae at photophases shorter than 12.5 h. Winter conditions in the northern part of the range of T. rutilus appear to play a prominent role in the maintenance and termination of diapause.

scholarly journals Critical Photoperiod and Its Potential to Predict Mosquito Distributions and Control Medically Important Pests

2021 ◽  
Author(s):  
Caitlin S Peffers ◽  
Laura W Pomeroy ◽  
Megan E Meuti
Keyword(s):  
Mosquito Species ◽  
Annual Cycles ◽  
Wyeomyia Smithii ◽  
Critical Photoperiod ◽  
Different Populations ◽  
Negative Impacts ◽  
Diapause Incidence ◽  
Aedes Sierrensis ◽  
And Control ◽  
Seasonal Responses

Abstract Diapause, a period of arrested development that allows mosquitoes to survive inhospitable conditions, is triggered by short daylengths in temperate mosquitoes. Different populations of mosquitoes initiate diapause in response to a specific photoperiod, or daylength, resulting in population-specific differences in annual cycles of abundance. The photoperiod that causes approximately 50% of a population to initiate diapause is known as the critical photoperiod (CPP). The autumn daylength corresponding to the CPP in the field likely marks the day beyond which the photoperiods would trigger and maintain 50% or more diapause incidence in a population, although temperature, diet, and other factors can impact diapause initiation. In the Northern Hemisphere, northern populations of mosquitoes experience lower temperatures earlier in the year and must be triggered into diapause by longer daylengths than southern populations. CPP is genetically based, but also adapts over time responding to the population’s environment. Therefore, CPP has been shown to lengthen with increasing latitude and altitude. While the positive correlation between CPP and latitude/altitude has been established in a few mosquito species, including Aedes albopictus (Skuse, Diptera: Culicidae), Aedes triseriatus, Aedes sierrensis, and Wyeomyia smithii (Coquillett, Diptera: Culicidae), we do not know when most other species initiate their seasonal responses. As several of these species transmit important diseases, characterizing the CPP of arthropod vectors could improve existing control by ensuring that surveillance efforts align with the vector’s seasonally active period. Additionally, better understanding when mosquitoes and other vectors initiate diapause can reduce the frequency of chemical applications, thereby ameliorating the negative impacts to nontarget insects.

Pathogenicity of fungi isolated from field-collected larvae of the western treehole mosquito, Aedes sierrensis (Diptera: Culicidae)

1988 ◽  
Vol 52 (2) ◽  
pp. 360-363 ◽  
Author(s):  
Gary A. Saunders ◽  
Jan O. Washburn ◽  
David E. Egerter ◽  
John R. Anderson
Keyword(s):  
Treehole Mosquito ◽  
Aedes Sierrensis

scholarly journals Experiments on invertebrate predation on cladocerans and its relationships with lake data

2021 ◽  
Author(s):  
Tânia C. Dos Santos Ferreira ◽  
Marlene S. Arcifa
Keyword(s):  
Prey Species ◽  
Laboratory Data ◽  
Fourth Instar ◽  
Experimental Results ◽  
Light Conditions ◽  
Invertebrate Predation ◽  
Water Mite ◽  
Cladoceran Species ◽  
Invertebrate Predators ◽  
The Impact

Until recently, knowledge of the impact of invertebrate predators on cladocerans in the Brazilian Lake Monte Alegre was limited to a few species. In order to assess the effects of predation on other cladoceran species, experiments were carried out with different pair-wise combinations of prey species. The experiments tested predation by fourth instar larvae of the dipteran Chaoborus brasiliensis Theobald on neonates and adults of the cladocerans Daphnia gessneri Herbst, Diaphanosoma birgei Kořínek, and Ceriodaphnia richardi Sars, and predation by the water mite Krendowskia sp. on neonates and adults of C. richardi and D. gessneri. In replicated treatments, the prey was offered alone or in combination with neonates and adults of two species and kept in bottles on a plankton wheel under controlled temperature, photoperiod, and light conditions. Chaoborus larvae preyed on neonates of D. birgei and D. gessneri and on adults of the former species. They preyed preferentially on neonates and adults of D. birgei over neonates and adults of C. richardi. The mite Krendowskia sp. preyed on only one species: neonates and adults of D. gessneri. Data on the distribution and strategies of prey in the lake are discussed in light of the experimental results, in an attempt to establish a link between laboratory data and field conditions.

The effect of temperature and photoperiod on the induction of larval diapause in the mosquito Aedes togoi (Theobald) (Diptera: Culicidae)

1987 ◽  
Vol 65 (9) ◽  
pp. 2262-2265 ◽  
Author(s):  
Brian E. Galka ◽  
Reinhart A. Brust
Keyword(s):  
Larval Stage ◽  
Fourth Instar ◽  
Effect Of Temperature ◽  
Larval Diapause ◽  
Critical Photoperiod ◽  
Aedes Togoi

Aedes togoi (Theobald) from Vancouver, B.C., may enter diapause in either the egg or larval stage. Larval diapause occurred in the fourth instar, when immatures were maintained at 16 °C or less, at photoperiods shorter than 12 h light/day. The critical photoperiod was calculated as 10.9L:13.1D at 16 °C. Larvae that failed to pupate after 40 days following hatching were recorded as being in diapause. At light periods greater than 12 h at 16 °C, there was no larval diapause and, at 14 °C, 100% of the larvae diapaused at 10L:14D. Temperatures of 18 °C or higher, at 10L:14D, prevented larval diapause.

scholarly journals New distribution records and range extensions of mosquitoes in British Columbia and the Yukon Territory

2020 ◽  
Author(s):  
Daniel AH. Peach ◽  
Lisa M. Poirier
Keyword(s):  
British Columbia ◽  
First Record ◽  
Yukon Territory ◽  
Coquillettidia Perturbans ◽  
The Common ◽  
Treehole Mosquito ◽  
Aedes Sierrensis ◽  
Common House ◽  
New Distribution ◽  
Culiseta Incidens

AbstractWe report the first records of Aedes euedes Howard, Dyar, and Knab, and Coquillettidia perturbans (Walker) from Canada’s Yukon Territory, and the first record of Ae. decticus Howard, Dyar, and Knab from British Columbia. We also report range extensions in northern BC for the western treehole mosquito, Aedes sierrensis (Ludlow), the common house mosquito, Culex pipiens L., and the cool weather mosquito Culiseta incidens (Thomson).

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