Extrinsic light:dark cycles, rather than endogenous circadian cycles, affect the photoperiodic counter in the pitcher-plant mosquito, Wyeomyia smithii.

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
Kevin J EmersonC M Holzapfel

Abstract

A wide diversity of organisms use photoperiod (daylength) as an environmental cue to anticipate the changing seasons and to time various life-history events such as dormancy and migration. Photoperiodic time measurement consists of two main components, (1) the photoperiodic timer that discriminates between long and short days, and (2) the photoperiodic counter that accumulates and stores information from the timer and then induces the phenotypic output. Herein, we use extended night treatments to show that light is necessary to accumulate photoperiodic information across the geographic range of the mosquito, Wyeomyia smithii and that the photoperiodic counter counts extrinsic (external) light:dark cycles and not endogenous (internal) circadian cycles.

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Citations

Feb 5, 2009·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Kevin J EmersonChristina M Holzapfel
Apr 26, 2013·Integrative and Comparative Biology·Megan E Meuti, David L Denlinger
Dec 18, 2008·BMC Physiology·Suchismita Das, George Dimopoulos
Feb 13, 2010·Annual Review of Physiology·William E Bradshaw, Christina M Holzapfel
Nov 28, 2012·Journal of Insect Physiology·D S Saunders
May 21, 2010·Journal of Biological Rhythms·William E Bradshaw, Christina M Holzapfel
Mar 1, 2011·FEBS Letters·Luca SchiesariRodolfo Costa

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