The Daily Activity Period of Nesting White-Crowned Sparrows in Continuous Daylight at 65°N Compared with Activity Period at Lower Latitudes

The Condor ◽  
1986 ◽  
Vol 88 (3) ◽  
pp. 382-384 ◽  
Author(s):  
James R. King
Keyword(s):  
Daily Activity ◽  
Activity Period

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.

Factors Influencing Flight Activity of Colonies of the Stingless Bee Trigona-Carbonaria (Hymenoptera, Apidae)

1993 ◽  
Vol 41 (4) ◽  
pp. 343 ◽  
Author(s):  
TA Heard ◽  
JK Hendrikz
Keyword(s):  
Daily Activity ◽  
Daily Variation ◽  
Stingless Bee ◽  
Flight Activity ◽  
Activity Period ◽  
Diel Pattern ◽  
Experimental Site ◽  
Factors Influencing ◽  
The Hours ◽  
Trigona Carbonaria

Temporal patterns of flight activity and influence of climatic variables on activity of colonies of the potentially useful crop pollinator, Trigona carbonaria Smith, were investigated. Colonies of T. carbonaria were active all the year at the experimental site but the daily activity period was longer in the warmer months. Intensity of daily flight activity was greatest in September and least in May. Temperature and radiation were the most important variables affecting flight activity. They impose thresholds on activity, with flight occurring only at temperatures greater than 18-degrees-C and radiation greater than 15 W m-2. Temperature and radiation also influence the intensity of activity above the thresholds. Relative humidity, vapour pressure, cloud cover and wind speed had no significant effect. A variable measuring the hours from daily peak of activity was significantly correlated with flight activity, indicating an intrinsic diel pattern of activity. Daily variation in flight activity, representing the influence of unmeasured variables, was also significant.

Testosterone and Daily Activity Period in Laboratory-Housed Mountain Spiny Lizards, Sceloporus jarrovi

2004 ◽  
Vol 38 (1) ◽  
pp. 120-124 ◽  
Author(s):  
Matthew Klukowski ◽  
Betty Ackerson ◽  
Craig E. Nelson
Keyword(s):  
Daily Activity ◽  
Activity Period ◽  
Sceloporus Jarrovi

scholarly journals Seasonal variations of locomotor activity rhythms in melatonin-proficient and -deficient mice under seminatural outdoor conditions

2021 ◽  
Author(s):  
◽  
Joshua Metzger
Keyword(s):  
Locomotor Activity ◽  
Ambient Temperature ◽  
Daily Activity ◽  
Activity Patterns ◽  
Laboratory Mouse ◽  
Activity Period ◽  
Mouse Strains ◽  
Frankfurt Am Main ◽  
Seasonal Differences ◽  
Laboratory Conditions

Locomotor activity patterns of laboratory mice are widely used to analyze circadian mechanisms, but most investigations have been performed under standardized laboratory conditions. Outdoors, animals are exposed to daily changes in photoperiod and other abiotic cues that might influence their circadian system. To investigate how the locomotor activity patterns under outdoor conditions compare to controlled laboratory conditions, we placed 2 laboratory mouse strains (melatonin-deficient C57Bl and melatonin-proficient C3H) in the garden of the Dr. Senckenbergische Anatomie in Frankfurt am Main. The mice were kept singly in cages equipped with an infrared locomotion detector, a hiding box, nesting material, and with food and water ad libitum. The locomotor activity of each mouse was recorded for 1 year, together with data on ambient temperature, light, and humidity. Chronotype, chronotype stability, total daily activity, duration of the activity period, and daily diurnality indices were determined from the actograms. C3H mice showed clear seasonal differences in the chronotype, its stability, the total daily activity, and the duration of the activity period. These pronounced seasonal differences were not observed in the C57Bl. In both strains, the onset of the main activity period was mainly determined by the evening dusk, whereas the offset was influenced by the ambient temperature. The actograms did not reveal infra-, ultradian, or lunar rhythms or a weekday/weekend pattern. Under outdoor conditions, the 2 strains retained their nocturnal locomotor identity as observed in the laboratory. Our results indicate that the chronotype displays a seasonal plasticity that may depend on the melatoninergic system. Photoperiod and ambient temperature are the most potent abiotic entraining cues. The timing of the evening dusk mainly affects the onset of the activity period; the ambient temperature during this period influences the latter’s duration. Humidity, overall light intensities, and human activities do not affect the locomotor behavior.

Temperature and exudativory as drivers of the marmoset ( Callithrix spp.) daily activity period

2021 ◽  
Author(s):  
Renato R. Hilário ◽  
Saulo M. Silvestre ◽  
Filipa Abreu ◽  
Raone Beltrão‐Mendes ◽  
Carla S. S. Castro ◽  
...  
Keyword(s):  
Daily Activity ◽  
Activity Period

Behavioral feedback regulation of circadian rhythm phase angle in light-dark entrained mice

2000 ◽  
Vol 279 (3) ◽  
pp. R813-R821 ◽  
Author(s):  
R. E. Mistlberger ◽  
M. M. Holmes
Keyword(s):  
Phase Angle ◽  
Daily Activity ◽  
Wheel Running ◽  
Feedback Regulation ◽  
Activity Period ◽  
Activity Levels ◽  
Light Pulses ◽  
Dd Mice ◽  
Behavioral Feedback

Induced and spontaneous wheel running can alter the phase and period (τ) of circadian rhythms in rodents. The relationship between spontaneous running and the phase angle (ψ) of entrainment to 24-h light-dark (LD) cycles was evaluated in C57BL/6j mice. With a wheel freely available, ψ was significantly correlated with the absolute ( r = 0.32) and relative ( r = 0.44) amount of activity during the first 2 h of the activity period. When wheels were locked during the first half of the night in LD and then unlocked in constant dark (DD), mice exhibited a delayed ψ and lengthened τ compared with mice that had wheels locked during the second half of the night. In DD, τ correlated negatively with total daily activity. To evaluate if wheel running modulates the phase-resetting actions of LD, phase shifts to light pulses were measured at two time points in DD, when daily activity levels differed by 40%. Phase delays to light were 56% greater when activity levels were lower. However, in a counterbalanced follow-up experiment, phase advances and delays to light pulses were not affected by the availability of wheels, although an effect of time in DD was replicated. Spontaneous activity can regulate ψ and τ without altering the response of the pacemaker to light.

scholarly journals Seasonal Variations of Locomotor Activity Rhythms in Melatonin-Proficient and -Deficient Mice under Seminatural Outdoor Conditions

2019 ◽  
Vol 35 (1) ◽  
pp. 58-71 ◽  
Author(s):  
Joshua Metzger ◽  
Helmut Wicht ◽  
Horst-Werner Korf ◽  
Martina Pfeffer
Keyword(s):  
Locomotor Activity ◽  
Ambient Temperature ◽  
Daily Activity ◽  
Activity Patterns ◽  
Laboratory Mouse ◽  
Activity Period ◽  
Mouse Strains ◽  
Frankfurt Am Main ◽  
Seasonal Differences ◽  
Laboratory Conditions

Locomotor activity patterns of laboratory mice are widely used to analyze circadian mechanisms, but most investigations have been performed under standardized laboratory conditions. Outdoors, animals are exposed to daily changes in photoperiod and other abiotic cues that might influence their circadian system. To investigate how the locomotor activity patterns under outdoor conditions compare to controlled laboratory conditions, we placed 2 laboratory mouse strains (melatonin-deficient C57Bl and melatonin-proficient C3H) in the garden of the Dr. Senckenbergische Anatomie in Frankfurt am Main. The mice were kept singly in cages equipped with an infrared locomotion detector, a hiding box, nesting material, and with food and water ad libitum. The locomotor activity of each mouse was recorded for 1 year, together with data on ambient temperature, light, and humidity. Chronotype, chronotype stability, total daily activity, duration of the activity period, and daily diurnality indices were determined from the actograms. C3H mice showed clear seasonal differences in the chronotype, its stability, the total daily activity, and the duration of the activity period. These pronounced seasonal differences were not observed in the C57Bl. In both strains, the onset of the main activity period was mainly determined by the evening dusk, whereas the offset was influenced by the ambient temperature. The actograms did not reveal infra-, ultradian, or lunar rhythms or a weekday/weekend pattern. Under outdoor conditions, the 2 strains retained their nocturnal locomotor identity as observed in the laboratory. Our results indicate that the chronotype displays a seasonal plasticity that may depend on the melatoninergic system. Photoperiod and ambient temperature are the most potent abiotic entraining cues. The timing of the evening dusk mainly affects the onset of the activity period; the ambient temperature during this period influences the latter’s duration. Humidity, overall light intensities, and human activities do not affect the locomotor behavior.

scholarly journals Turkey Vultures Use Anthropogenic Thermals to Extend Their Daily Activity Period

2007 ◽  
Vol 119 (1) ◽  
pp. 102-105 ◽  
Author(s):  
James T. Mandel ◽  
Keith L. Bildstein
Keyword(s):  
Daily Activity ◽  
Activity Period ◽  
Turkey Vultures
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