Diel periodicity in spermatophore formation in the house cricket, Acheta domesticus (L.)

1968 ◽  
Vol 46 (4) ◽  
pp. 695-698 ◽  
Author(s):  
J. E. McFarlane
Keyword(s):  
Dark Period ◽  
Continuous Light ◽  
Light Period ◽  
Acheta Domesticus ◽  
Diel Periodicity ◽  
Light Conditions ◽  
House Cricket ◽  
Male House

Male house crickets reared individually at 28 °C developed a diel periodicity in spermatophore formation, which consisted in loss of the spermatophore during the dark period and secretion during the light period. The periodicity became established only after most of the insects had formed at least two spermatophores in a random way with respect to light conditions. When periodicity was established, rearing the insects in continuous light resulted in the retention of the spermatophore by nearly all insects. Stridulation began in all experiments at the time of first spermatophore formation.

Monophasic and diphasic patterns of the circadian caecotrophy rhythm of rabbits

1982 ◽  
Vol 16 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Burghart Jilge
Keyword(s):  
Dark Period ◽  
Continuous Light ◽  
Light Period ◽  
Period Length ◽  
Rodent Species ◽  
Average Period ◽  
Dark Cycle

The circadian caecotrophy rhythm was synchronized with the light-dark cycle of 12 : 12 h. During this the rabbits practised caecotrophy regularly during the light period. While most rabbits manifested 1 caecotrophy per 24 h (monophasic caecotrophy), some had an additional caecotrophy during the dark period (diphasic caecotrophy). During continuous light the circadian caecotrophy rhythm ran free monophasically, even in those rabbits which were diphasic under the preceding 12 : 12 regime. The average period length amounted to 24·7 ± 0·3 h. Following restoration of the 12 : 12 routine animals reestablished their original caecotrophy pattern. In a further test the caecotrophy pattern remained constant during a constant 12 : 12 regimen, but changed in 7 of 16 animals when the photoperiod was reduced first to 60 min and then to 2 × 60 min light every 24 h. The reduction of the lit time resulted in an increased occurrence of diphasic animals. Details of synchronization of the caecotrophy rhythm with the different light-dark schedules are given. These results accord with data obtained in nocturnal rodent species.

Diel Periodicity of Chlorophyll a Concentration in Oregon Coastal Waters

1972 ◽  
Vol 29 (9) ◽  
pp. 1253-1259 ◽  
Author(s):  
Walter A. Glooschenko ◽  
Herbert Curl Jr. ◽  
Lawrence F. Small
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Coastal Waters ◽  
Dark Period ◽  
Skeletonema Costatum ◽  
Time Of Day ◽  
Light Period ◽  
Diel Periodicity ◽  
Low Light ◽  
Chlorophyll Precursor

Concentrations of chlorophyll a in phytoplankton exhibited a diel periodicity in Oregon coastal waters. Maximum surface concentrations often occurred around midnight and highest 25-m concentrations early in the evening (or even in late afternoon). Concentrations at intermediate depths fell in between and in a predictable progression with depth and time of day. Minimum chlorophyll a values occurred in the afternoon. No definite periodicity was established at 50 m.Laboratory studies with Skeletonema costatum demonstrated that the diel cycle of chlorophyll a per cell was related to the light intensity and duration to which cells were exposed. Highest concentrations of this pigment occurred early in the dark period and lowest concentrations in the light period when cells were grown under photoperiods of 9, 12, and 15 hr at a light intensity of approximately 1200 ft-c. Pigment bleaching probably was responsible for the low concentrations during the light period. The decline of chlorophyll a from the maximum early in the dark period began after the cells possibly became deficient in some chlorophyll precursor or energy-yielding substrate. Addition of an external carbon source during the dark period prolonged the high chlorophyll a concentrations in the dark before the decline began. Under low light (400 ft-c) chlorophyll a synthesis occurred only in the light. This phenomenon was most likely due to an insufficient amount of energy-yielding substrate or precursor synthesized during the low-light period, and the lack of bleaching in the light period at this lower intensity. The laboratory results were consistent with interpretations of the field data. A correction for diel pigment periodicity is recommended for models estimating photosynthesis from chlorophyll and light data and for oceanographic surveys during which sampling of chlorophyll a is carried out throughout the 24-hr day.

Protein synthesis by the accessory gland of male house cricket,Acheta domesticus

1975 ◽  
Vol 193 (1) ◽  
pp. 21-36 ◽  
Author(s):  
M. S. Kaulenas ◽  
R. L. Yenofsky ◽  
H. E. Potswald ◽  
A. L. Burns
Keyword(s):  
Protein Synthesis ◽  
Accessory Gland ◽  
Acheta Domesticus ◽  
House Cricket ◽  
Male House

Synthesis of prostaglandin by reproductive tissue of the male house cricket, acheta domesticus

1974 ◽  
Vol 6 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Don B. Destephano ◽  
U. Eugene Brady ◽  
Robert E. Lovins
Keyword(s):  
Acheta Domesticus ◽  
Reproductive Tissue ◽  
House Cricket ◽  
Male House

Maturation of the immune system of the male house cricket, Acheta domesticus

2013 ◽  
Vol 59 (8) ◽  
pp. 752-760 ◽  
Author(s):  
Angelica V. Piñera ◽  
Heather M. Charles ◽  
Tracy A. Dinh ◽  
Kathleen A. Killian
Keyword(s):  
Immune System ◽  
Acheta Domesticus ◽  
House Cricket ◽  
Male House

Effect of different combinations of light and dark regimes on the performance of egg lay events, fertility and plasma steroid hormones, during the ovulatory cycle in Peking ducks

1988 ◽  
Vol 111 (1) ◽  
pp. 99-105 ◽  
Author(s):  
M. A. Abdelrazik ◽  
Gh. A. El Sayiad ◽  
I. F. M. Marai ◽  
M. M. Soliman
Keyword(s):  
Inverse Relationship ◽  
Dark Period ◽  
Continuous Light ◽  
Light Period ◽  
Ovulatory Cycle ◽  
Shell Weight ◽  
Egg Weight ◽  
Plasma Progesterone ◽  
Pause Length ◽  
Photoperiodic Regime

SummaryDifferent photoperiodic treatments within 2 types of light dark cycles ranging from 24 to 30 h were applied to Peking ducks. The first consisted of constant photoperiods (1, 8L: 16D; 2, 14 L: 10D; 3, 18L:6D; 4, 14L: 13D; 5, 14L: 16D and 6, continuous light) and the second of intermittent cycles (1, 6L:2D:2L:14p; 2, 6L:4D:2L:12D; 3, 6L:6D:2L:10D; 4, 6L:8D:2L:8D and 5, 14L:½D:3½L:6D). The traits studied varied in response according to the photoperiodic regimes used. Rate of lay and eggs laid in the modal 8 h period increased with the duration of the light period in the cycle. Sequence lengths of 1–3 eggs were most frequent under all photoperiodic regimes (constant and intermittent). Length of intra-sequence interval (h) showed an inverse relationship with length of inter-sequence interval. A pause length of 2–4 days was the most frequent for all the different light-dark cycles. Egg weight was heavier in the second season than in the first when the light period of the photoperiodic regime was long. Weights of albumin and yolk showed similar trends to egg weight. The latter differences were significant, while shell weight differences were not significant. Plasma progesterone lvels were lowest in non-laying ducks. The highest values in laying ducks were before ovulation. The highest level of cortisol was shown during the last hours of the dark period. Differences from ovulatory cycle to another were observed.

Variations in Motor Activity and in Food and Water Intake over 24 h Periods in Pigs

1980 ◽  
Vol 95 (2) ◽  
pp. 371-380 ◽  
Author(s):  
D. L. Ingram ◽  
D. E. Walters ◽  
K. F. Legge
Keyword(s):  
Food Intake ◽  
Motor Activity ◽  
Water Consumption ◽  
Dark Period ◽  
Continuous Light ◽  
External Noise ◽  
Light Period ◽  
Food And Water Intake ◽  
Temperature Controlled ◽  
Weaner Pigs

SUMMARYGroups of weaner pigs, and single animals, were observed in a temperature-controlled room isolated from external noise and light for periods of up to 4 weeks. Continuous records were made of motor activity, food intake and water consumption.In the presence of a cycle of 12 h light and 12 h dark at 25 °C groups of pigs were most active in the light and took most of their food towards the end of the light period. Single pigs also tended to be more active in the light, but the rhythms were less marked, and one animal was most active during the dark period.In continuous light, rhythms of activity and ingestion tended to collapse after only a few days, particularly in pigs which were kept by themselves. When the ambient temperature was increased to 35 °C during 12 h light and decreased to 25 °C during 12 h dark, a group of pigs was most active in the dark.

A photosensitive daily rhythm in the female medaka, Oryzias latipes

1976 ◽  
Vol 54 (6) ◽  
pp. 852-856 ◽  
Author(s):  
Kenneth Ka-Sing Chan
Keyword(s):  
Adult Female ◽  
Ovarian Development ◽  
Dark Period ◽  
Continuous Light ◽  
Oryzias Latipes ◽  
Exposure Period ◽  
Light Period ◽  
Spawning Season ◽  
Daily Rhythm ◽  
Warm Temperature

Adult female medaka, Oryzias latipes, with regressed ovaries were exposed to 7 h of continuous light plus an additional hour of light at different times during the dark period of a 24-h cycle (7 + 1 light: 16 dark) at 24 ± 1 °C. When this additional hour of light falls on the 16th h, counting the onset of the light period as the 0 h, ovarian development was induced. This ovarian development is enhanced when the exposure period is increased and when the fish are preexposed to a warm temperature. The use of a photosensitive daily rhythm to measure photoperiod and to time the spawning season in the medaka is suggested.

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