Estimation of Circadian Activity Pattern When the Beginning and End of Active Periods are Not Always Observable

Biometrics ◽  
1991 ◽  
Vol 47 (4) ◽  
pp. 1547
Author(s):  
Helga Jonsdottir Vivas ◽  
Steinar Engen
Keyword(s):  
Activity Pattern ◽  
Circadian Activity ◽  
Circadian Activity Pattern

A comparative study on insemination dependency of circadian activity pattern in mosquitoes

1992 ◽  
Vol 17 (3) ◽  
pp. 213-218 ◽  
Author(s):  
YOSHIHIKO CHIBA ◽  
YASUHIRO SHINKAWA ◽  
MAKOTO YOSHII ◽  
AKIRA MATSUMOTO ◽  
KENJI TOMIOKA ◽  
...  
Keyword(s):  
Comparative Study ◽  
Activity Pattern ◽  
Circadian Activity ◽  
Circadian Activity Pattern

scholarly journals Winter circadian activity pattern of free-ranging coypus in the Paraná River Delta, eastern Argentina

1994 ◽  
Vol 39 ◽  
pp. 83-88 ◽  
Author(s):  
Francisco Palomares ◽  
Roberto Bó ◽  
Juan F. Beltrán ◽  
Gloria Villafañe ◽  
Sacramento Moreno
Keyword(s):  
Activity Pattern ◽  
Paraná River ◽  
River Delta ◽  
Circadian Activity ◽  
Parana River ◽  
Free Ranging ◽  
Circadian Activity Pattern

scholarly journals Allatostatin-C/AstC-R2 Is a Novel Pathway to Modulate the Circadian Activity Pattern in Drosophila

2019 ◽  
Vol 29 (1) ◽  
pp. 13-22.e3 ◽  
Author(s):  
Madelen M. Díaz ◽  
Matthias Schlichting ◽  
Katharine C. Abruzzi ◽  
Xi Long ◽  
Michael Rosbash
Keyword(s):  
Activity Pattern ◽  
Circadian Activity ◽  
Circadian Activity Pattern

scholarly journals Allatostatin C/AstC-R2 is a Novel Pathway to Modulate Circadian Activity Pattern in Drosophila

2018 ◽  
Author(s):  
Madelen M. Díaz ◽  
Matthias Schlichting ◽  
Katharine C. Abruzzi ◽  
Michael Rosbash
Keyword(s):  
Locomotor Activity ◽  
Signaling Pathway ◽  
Calcium Imaging ◽  
Activity Pattern ◽  
Behavioral Response ◽  
Ex Vivo ◽  
Circadian Activity ◽  
Behavioral Experiments ◽  
Lateral Posterior ◽  
Circadian Activity Pattern

AbstractSix neuropeptides are expressed within the Drosophila brain circadian network. Our previous mRNA profiling suggested that AllatostatinC is a seventh neuropeptide and specifically expressed in dorsal clock neurons (DN1s). Our results here show that AstC is indeed expressed in DN1s, where it oscillates. AstC is also expressed in two less well-characterized circadian neuronal clusters, the DN3s and lateral posterior neurons (LPNs). Behavioral experiments indicate that clock neuron-derived AstC is required to mediate evening locomotor activity under short (winter-like) photoperiods. The AstC-Receptor 2 (AstC-R2) is expressed in LNds, the clock neurons that drive evening locomotor activity, and AstC-R2 is required in these neurons to modulate the same short photoperiod evening phenotype. Ex vivo calcium imaging indicates that AstC directly inhibits a single LNd neuron. The results suggest that a novel AstC/AstC-R2 signaling pathway, from dorsal circadian neurons to an LNd, regulates the behavioral response to changing photoperiod in Drosophila.

Circadian Activity Pattern with Two Peaks

Ecology ◽  
1966 ◽  
Vol 47 (4) ◽  
pp. 657-662 ◽  
Author(s):  
Jurgen Aschoff
Keyword(s):  
Activity Pattern ◽  
Circadian Activity ◽  
Two Peaks ◽  
Circadian Activity Pattern

scholarly journals Daily activity of four tropical intertidal hermit crabs from Southeastern Brazil

2003 ◽  
Vol 63 (3) ◽  
pp. 537-544 ◽  
Author(s):  
A. Turra ◽  
M. R. Denadai
Keyword(s):  
High Activity ◽  
Activity Pattern ◽  
Daily Activity ◽  
Activity Patterns ◽  
High Tide ◽  
Hermit Crabs ◽  
Activity Period ◽  
Southeastern Brazil ◽  
Intertidal Flat ◽  
Circadian Activity

This study describes the daily activity in a simulated high tide situation of four species of hermit crabs (Pagurus criniticornis, Clibanarius antillensis, C. sclopetarius, and C. vittatus) that coexist in an intertidal flat in southeastern Brazil. Observations were done in two-hour intervals during two subsequent days (48 h) in three replicate pools with thirty crabs each. Among species (between and within genera) there was an evident variation in activity patterns, of which three could be distinguished. The circadian activity patterns of C. antillensis and C. vittatus could be characterized as evening and nocturnal, with resting peaks during the morning and afternoon. The circadian activity pattern of C. sclopetarius was characterized by two marked peaks of inactivity, corresponding to dawn and evening, which could represent an intrinsic association with the semi-lunar tidal cycles of the study area. Pagurus criniticornis showed high activity not influenced by day/night conditions during the entire observed period. These activity pattern variations of the studied hermit crabs should be taken into account in designing further experiments. More precise and accurate interspecific behavioral comparisons among species could be achieved in nocturnal experiments, the high activity period of all species.

Circadian flight activity of Arabian sandflies (Diptera: Psychodidae) using a vehicle-mounted net

1996 ◽  
Vol 86 (1) ◽  
pp. 61-66 ◽  
Author(s):  
D.M. Roberts
Keyword(s):  
Cutaneous Leishmaniasis ◽  
Activity Pattern ◽  
Activity Patterns ◽  
Abundant Species ◽  
Flight Activity ◽  
Circadian Activity ◽  
Light Intensities ◽  
Early Peak ◽  
Two Peaks

AbstractA vehicle-mounted net was used on 15 nights during June 1990 and 1991 in northern Oman to collect sandflies in order to identify potential vectors of visceral and cutaneous leishmaniasis. A total of 2216 sandflies was collected comprising four species of Phlebotomus and three of Sergentomyia. Catches were made every 30 minutes between 17.00 h (2 hours before sunset) and 07.00 h (1.5 hours after sunrise). Very few flies were caught before sunset. Most flies were caught at light intensities < 0.1 lux (between 20.00 and 0.500 h), but some flight activity, particularly of males and unfed females, continued even up to 07.00 h (50,000 lux, 1.25 hours after sunrise). Females of the two most abundant species, Phlebotomus alexandri Sinton and Sergentomyia clydei Sinton were significantly more active during the first half of the night (19.00-01.00 h), but males were not. Males of S. clydei showed no clear activity pattern, while males of P. alexandri had two peaks with a decline in activity around 01.00 h. Sergentomyia tiberiadis Adler & Theodor and S. fallax Parrot similarly showed different activity patterns for the two sexes. The circadian activity of females of P. alexandri and S. clydei changed during their gonotrophic cycles. Thus unfed and gravid P. alexandri had two activity peaks during the night, but the blood-fed females were most active during the first half of the night. S. clydei activity was similar, except that the gravid flies, like the blood-fed, had an early peak of activity. Too few parous females were collected to show any clear difference in activity from the nullipars.

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