Photoperiodic Control of Egg Hatching in the Mosquito Mansonia titillans1,2

Nayar, Jai K.; Samarawickrema, W. A.; Sauerman, D. M.

doi:10.1093/aesa/66.4.831

Cited by 14 publications

(11 citation statements)

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“…The higher eclosion rate recorded at environmental temperature (25-29°C) indicates that temperature variation may stimulate eclosion, like others reported in the literature, such as reducing water oxygen content (Judson 1963) and photoperiod (Nayar et al 1973). Moreover, the asynchronous eclosion shown through the high standard deviation, suggests a great variety of individual responses.…”

Section: Discussionsupporting

confidence: 51%

Eclosion rate, development and survivorship of Aedes albopictus (Skuse)(Diptera: Culicidae) under different water temperatures

Monteiro¹,

Souza²,

Albuquerque³

2007

Neotrop. entomol.

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Neotropical Entomology 36 (6):966-971 (2007) Eclosão, Desenvolvimento e Sobrevivência de Aedes albopictus (Skuse) (Diptera: Culicidae) sob Diferentes Condições de Temperatura da Água RESUMO -Em áreas tropicais, onde as populações de insetos vetores são particularmente abundantes, as temperatura usualmente variam entre 25°C e 35°C. Considerando a importância dessa variação na determinação da dinâmica populacional de mosquitos, neste trabalho, desenvolvimento e as taxas de eclosão e sobrevivência dos estágios imaturos de Aedes albopictus (Skuse) foram comparados sob temperaturas constantes de 25, 30 e 35°C (em câmaras climatizadas) e ambientes (25°C a 29°C). A taxa de eclosão foi considerada como o total de larvas obtidas após 24h. O período de desenvolvimento, assim como a taxa de sobrevivência larval e pupal foram avaliados diariamente. A taxa de eclosão foi signifi cativamente mais elevada sob temperatura ambiente comparada às constantes, sugerindo que a variação da temperatura pode ser um fator estimulante da eclosão. O tempo médio de eclosão aumentou com a temperatura, variando de 2,8h (25ºC) a 5,2h (35ºC). A duração do período larval apresentou grande variabilidade dentro de cada grupo, embora não tenha diferido signifi cativamente entre os mesmos (11,0 ± 4,19 dias), tendo sido mais longo para indivíduos mantidos na água a 35°C (12,0 ± 4,95 dias) e temperatura ambiente (13,6 ± 5,98 dias). Ao contrário, a sobrevivência das larvas foi fortemente afetada na temperatura mais elevada, onde apenas um indivíduo alcançou o estágio adulto. Esses resultados sugerem que a população de Ae. albopictus de Recife pode estar em processo de adaptação ao aumento de temperatura e que o limite para o desenvolvimento de estágios larvais se encontra próximo a 35°C. PALAVRAS-CHAVE: Biologia, vetor, ciclo de vida, limite térmicoABSTRACT -In tropical areas, where vector insects populations are particularly numerous, temperature usually range between 25°C and 35°C. Considering the importance of such temperature variation in determining mosquitoes population dynamics, in this work the developmental, eclosion and survival rates of the immature stages of Aedes albopictus (Skuse) were compared under constant 25, 30 and 35°C (using acclimatized chambers) and environmental (25°C to 29°C) temperatures. The hatching rate was considered as total number of larvae recovered after 24h. The development period as well as larval and pupal survival rate were evaluated daily. Eclosion rate was signifi cantly higher under environmental temperature than under the studied constant temperatures, suggesting that temperature variation may be an eclosion-stimulating factor. The mean eclosion time increased with the temperature, ranging from 2.8h (25°C) to 5.2h (35°C). The larval period was greatly variable inside each group, although it did not differ signifi cantly amongst groups (11.0 ± 4.19 days), with individuals showing longer larval stages in water at 35°C (12.0 ± 4.95 days) and environmental temperature (13.6 ± 5.98 days). Oppositely, survival was...

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Section: Discussionsupporting

confidence: 51%

Eclosion rate, development and survivorship of Aedes albopictus (Skuse)(Diptera: Culicidae) under different water temperatures

Monteiro¹,

Souza²,

Albuquerque³

2007

Neotrop. entomol.

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“…Earlier studies have shown that pupation is gated in mosquitoes such as Anopheles gambiae [ 33 ] and Aedes taeniorhynchus [ 34 , 35 ], and the period ( per ) mRNA expression during pupation in fruit flies D. melanogaster is under circadian clock control [ 3 ]. Moreover, several developmental events such as egg-hatching [ 12 , 13 ], pupation [ 14 , 15 ] and wing-pigmentation [ 2 , 16 ], have been reported to show rhythmicity, which implies that circadian clocks are likely to interact with several gated events during the egg-hatching, pupation and wing-pigmentation stages. Such gated events and the transition time from one stage to another is likely to create constraints on the developmental rates, which in turn would cause reduction in the proportionate differences in the duration of pupal (Figure 2 b), wing-pigmentation (Figure 3 b) and pre-adult developmental stages of the FD and BD flies (Figure 4 b).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, studies on insects including Drosophila have reported rhythmicity in several developmental events such as egg-hatching [12,13], pupation [14,15] and wing-pigmentation [2,16], implying a role of circadian clocks in timing pre-adult stages.…”

Section: Introductionmentioning

confidence: 99%

“…Circadian clocks have been implicated in the temporal regulation of pre-adult development in D. melanogaster [ 5 , 6 ] as several studies have reported that the pre-adult development time and clock period show positive correlation [ 7 - 11 ]. Furthermore, studies on insects including Drosophila have reported rhythmicity in several developmental events such as egg-hatching [ 12 , 13 ], pupation [ 14 , 15 ] and wing-pigmentation [ 2 , 16 ], implying a role of circadian clocks in timing pre-adult stages.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of light regimes and circadian clocks modulate timing of pre-adult developmental events in Drosophila

2014

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BackgroundCircadian clocks have been postulated to regulate development time in several species of insects including fruit flies Drosophila melanogaster. Previously we have reported that selection for faster pre-adult development reduces development time (by ~19 h or ~11%) and clock period (by ~0.5 h), suggesting a role of circadian clocks in the regulation of development time in D. melanogaster. We reasoned that these faster developing flies could serve as a model to study stage-specific interaction of circadian clocks and developmental events with the environmental light/dark (LD) conditions. We assayed the duration of three pre-adult stages in the faster developing (FD) and control (BD) populations under a variety of light regimes that are known to modulate circadian clocks and pre-adult development time of Drosophila to examine the role of circadian clocks in the timing of pre-adult developmental stages.ResultsWe find that the duration of pre-adult stages was shorter under constant light (LL) and short period light (L)/dark (D) cycles (L:D = 10:10 h; T20) compared to the standard 24 h day (L:D = 12:12 h; T24), long LD cycles (L:D = 14:14 h; T28) and constant darkness (DD). The difference in the duration of pre-adult stages between the FD and BD populations was significantly smaller under the three LD cycles and LL compared to DD, possibly due to the fact that clocks of both FD and BD flies are driven at the same pace in the three LD regimes owing to circadian entrainment, or are rendered dysfunctional under LL.ConclusionsThese results suggest that interaction between light regimes and circadian clocks regulate the duration of pre-adult developmental stages in fruit flies D. melanogaster.

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“…An adult fly would emerge out of its puparium only if it is mature enough to do so when the emergence gate is open on that particular day, otherwise it has to wait for the gate to open on the next day. Similarly, in insects including Drosophila , egg‐hatching (Pittendrigh, ; Minis & Pittendrigh, ; Nayar et al ., ; Lazzari, ), pupation (Bakker & Nelissen, ; Nayar, ; Pittendrigh & Skopik, ; Jones & Reiter, ), and wing‐pigmentation (Harker, , ) have also been shown to be under circadian clock control.…”

Section: Introductionmentioning

confidence: 99%

Extent of mismatch between the period of circadian clocks and light/dark cycles determines time‐to‐emergence in fruit flies

et al. 2014

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Circadian clocks time developmental stages of fruit flies Drosophila melanogaster, while light/dark (LD) cycles delimit emergence of adults, conceding only during the "allowed gate." Previous studies have revealed that time-to-emergence can be altered by mutations in the core clock gene period (per), or by altering the length of LD cycles. Since this evidence came from studies on genetically manipulated flies, or on flies maintained under LD cycles with limited range of periods, inferences that can be drawn are limited. Moreover, the extent of shortening or lengthening of time-to-emergence remains yet unknown. In order to pursue this further, we assayed time-to-emergence of D. melanogaster under 12 different LD cycles as well as in constant light (LL) and constant dark conditions (DD). Time-to-emergence in flies occurred earlier under LL than in LD cycles and DD. Among the LD cycles, time-to-emergence occurred earlier under T4-T8, followed by T36-T48, and then T12-T32, suggesting that egg-to-emergence duration in flies becomes shorter when the length of LD cycles deviates from 24 h, bearing a strong positive and a marginally negative correlation with day length, for values shorter and longer than 24 h, respectively. These results suggest that the extent of mismatch between the period of circadian clocks and environmental cycles determines the time-to-emergence in Drosophila.

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Photoperiodic Control of Egg Hatching in the Mosquito Mansonia titillans1,2

Cited by 14 publications

References 0 publications

Eclosion rate, development and survivorship of Aedes albopictus (Skuse)(Diptera: Culicidae) under different water temperatures

Eclosion rate, development and survivorship of Aedes albopictus (Skuse)(Diptera: Culicidae) under different water temperatures

Interaction of light regimes and circadian clocks modulate timing of pre-adult developmental events in Drosophila

Extent of mismatch between the period of circadian clocks and light/dark cycles determines time‐to‐emergence in fruit flies

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