The effect of photoperiod on diapause induction, and temperature on diapause termination in embryos of Aedes campestris Dyar and Knab (Diptera: Culicidae)

1977 ◽  
Vol 55 (1) ◽  
pp. 129-134 ◽  
Author(s):  
P. Tauthong ◽  
R. A. Brust
Keyword(s):  
Diapause Induction ◽  
Geographical Region ◽  
Northern Population ◽  
Diapause Termination

Populations of Aedes campestris from Manitoba and Saskatchewan were found to be either multivoltine or univoltine depending upon the geographical region from which the adults were collected. Three southern populations (from 49–52° N) were found to be totally multivoltine, whereas a northern population (58° N) was found to be partially (36%) univoltine. The latter fraction was designated as univoltine because the eggs entered an obligatory diapause after oviposition. When univoltine eggs were placed at 30 °C for a period of 10 days, 59% of the eggs hatched when subjected to a hatching stimulus.Facultative dispause was induced in eggs of multivoltine populations of A. campestris, by subjecting fully embryonated eggs to photoperiods of less than 14 h per day. For example, after 30 days at 8 h light: 16 h dark 73% of the eggs entered diapause.

scholarly journals Geographic Variation of Diapause Induction and Termination in the Spider Mite Tetrαnychus urticαe: Α mini-review

2017 ◽  
Vol 12 ◽  
pp. 5 ◽  
Author(s):  
S. Koveos ◽  
A. Veerman
Keyword(s):  
Geographic Variation ◽  
Spider Mite ◽  
Wide Distribution ◽  
Mite Species ◽  
Climatic Conditions ◽  
Diapause Induction ◽  
Diapause Termination ◽  
Long Day ◽  
Critical Daylength ◽  
Tetranychus Urticae Koch

In eight strains of the spider mite Tetranychus urticae Koch (Acari: Tetranychidae), originating from different localities in Europe, the critical daylength for diapause induction and termination was almost the same in each strain but varied with the latitudinal origin of the strains; critical daylength was shorter in strains originating from lower latitudes and longer in those from higher latitudes. Diapause intensity, measured as the period of chilling required for diapause termination under a short day photoperiod (LD 10:14) and 19°C, again varied with the latitudinal origin of each strain, being higher the more northern the origin of the strain. An exception were two mountain strains which showed a longer critical daylength and a deeper diapause than expected on the basis of their latitudinal origin. The number of long-day (LD 17:7) cycles required for 50% diapause termination after a certain period of chilling was higher in the northern and lower in the southern strains. These results indicate that geographic strains of T urticae may differ considerably in their diapause attributes, which may be explained as an adaptation to local climatic conditions. The great plasticity of the diapause response may, among other factors, have been responsible for the wide distribution of this mite species.

INDUCTION AND TERMINATION OF DIAPAUSE IN THE FACE FLY, MUSCA AUTUMNALIS (DIPTERA: MUSCIDAE), IN THE LABORATORY

1978 ◽  
Vol 110 (6) ◽  
pp. 617-622 ◽  
Author(s):  
E. T. N. Caldwell ◽  
R. E. Wright
Keyword(s):  
Late Summer ◽  
Diapause Induction ◽  
Total Darkness ◽  
Diapause Termination ◽  
Critical Photoperiod ◽  
The Face ◽  
Musca Autumnalis

AbstractDiapause induction studies showed that face flies, Musca autumnalis De Geer, from a recently established colony, entered diapause more readily than those that had been colonized for many years. Photoperiods of less than 16 h of light induced diapause at 16° and 27 °C but more flies entered diapause at 16°C. Maximum numbers of flies entered diapause under total darkness at 16°C, but the critical photoperiod corresponding to natural periods of daylight in late summer was 15 h of light at 16°C. Diapause termination studies indicated that 4 months’ exposure to 5 °C under total darkness was required for the termination of diapause.

Photoperiodism of diapause induction and diapause termination inOstrinia furnacalis

2014 ◽  
Vol 153 (1) ◽  
pp. 34-46 ◽  
Author(s):  
Hui-Zhong Yang ◽  
Xiao-Yun Tu ◽  
Qin-Wen Xia ◽  
Hai-Min He ◽  
Chao Chen ◽  
...  
Keyword(s):  
Diapause Induction ◽  
Diapause Termination

A Description of the Surrounding Environs of Dar-ul Khilafa Shahjahanabad, AND THE INSCRIPTIONS [ON] THE BUILDINGS OF OLD DELHI

2018 ◽  
Author(s):  
Mirza Sangin Beg
Keyword(s):  
Self Esteem ◽  
The Self ◽  
Geographical Region ◽  
North West

Finally, Mirza Sangin Beg tackles a huge assemblage of eclectic human exertions in the environs, centred around areas of trade and commerce, piety, landscaped spaces, cemeteries, and natural surroundings of rivers and hillocks. While structures such as the Jantar Mantar and the Firoz Shah’s lat are alluded to, it is stories about the human agencies that are privileged above these spaces. There are detailed renderings of activities in areas such as Pahar Ganj, Subzi Mandi, and Qadam Sharif, the biannual fair at Hanuman Temple, celebrations of Salono, numerous chhariyan melas, and worship of Goga. A fantastic account of Makhdum Jahanian Jahan Gasht coexists with an intense belief in relics of Prophet Muhammad, Hazrat Ali, and Imam Husain. Mirza Sangin Beg goes beyond the geographical region of Delhi towards north, west, and southwest. He writes of Bu Ali Shah Qalander’s dargah in Panipat and of the English platoon, officers, and gentlemen stationed between Gurgaon and Pataudi. The author has placed a variety of inscriptions and epitaphs from equally diverse structures and graveyards in a fatuous manner. Certain inscriptions seem to satisfy the self-esteem of the builders, some are laudatory while several are informative.

scholarly journals Geographic Variation in Diapause Induction: The Grape Berry Moth (Lepidoptera: Tortricidae)

2010 ◽  
Vol 39 (6) ◽  
pp. 1751-1755 ◽  
Author(s):  
Jody Timer ◽  
Patrick C. Tobin ◽  
Michael C. Saunders
Keyword(s):  
Geographic Variation ◽  
Grape Berry ◽  
Diapause Induction
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