Circannual cycles in golden-mantled ground squirrels: Lengthening of period by low temperatures in the spring phase

Joy, Janet E.; Mrosovsky, N.

doi:10.1007/bf00606373

Cited by 14 publications

(9 citation statements)

References 17 publications

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“…This extends the findings in Joy and Mrosovsky (1983) by demonstrating that the delay is still present at the third peak weight in captivity. However, these effects were weaker than those obtained previously.…”

Section: Discussionsupporting

confidence: 73%

“…The first peaks in captivity occurred about 5.5 weeks earlier in those experiments. Both sexes were tested by Joy and Mrosovsky (1983), while the present data come from males only. The source of the animals and the cold pulse duration also differed between the two experiments.…”

Section: Discussionmentioning

confidence: 99%

“…One-tailed tests were used for the Spring Cold Pulse and the Continuous Cold Group for which the direction of effects was clearly predicted by previous work (Mrosovsky 1980a, b;Joy and Mrosovsky 1983). Two-tailed tests were used for the Fall Cold Pulse Group.…”

Section: Methodsmentioning

confidence: 99%

“…For ground squirrels, temperature is a possible candidate since it affects the periodicity, persistence and phasing of their circannual rhythms (Mrosovsky 1986). In particular, a few months of cold during the spring phase results in phase delays (Joy and Mrosovsky 1983). Temperature effects do not exclude the possibility that photoperiod may also have some synchronizing role for ground squirrels.…”

Section: Introductionmentioning

confidence: 99%

“…If cold acts also at other phases, does it produce delays or advances of the rhythm? This latter possibility must be taken seriously because ground squirrels trapped in the summer and kept in a cool or cold room reach pre-hibernation peak body weights earlier than those kept in a warm room (Pengelley and Fisher 1961;Joy and Mrosovsky 1983;Mrosovsky 1980b;Hall, pers. comm.).…”

Section: Introductionmentioning

confidence: 99%

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Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

Mrosovsky

1990

J Comp Physiol A

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Endogenous circannual rhythms of male golden-mantled ground squirrels (Spermophilus lateralis) exposed to low ambient temperature (6 ~ at various times were compared to the rhythms of a control group kept in a warm room (21 ~ throughout. A 20-week pulse of cold in the spring delayed the subsequent peak body weight and molt offset. However, in the second year after the spring cold pulse, a delay in the rhythm was evident only using peak weight as a phase marker. A 20-week cold pulse in the fall resulted in an earlier peak body weight and earlier onset of pigmented scrotum and descended testes, but there was no evidence from subsequent years that rhythms had been phase advanced. A third of the animals kept continuously at 6 ~ remained with pigmented scrotum, descended testes and low body weight for more than a year. Circannual periodicities of animals that continued to display rhythms in the cold room were not significantly longer than those of controls in the warm room. The results suggest that low temperature in the fall can alter the expression of circannual rhythms without much affecting their phasing, while low temperature in the spring produces phase delays which last longer but have not been proved to be persistent.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

Mrosovsky

1990

J Comp Physiol A

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Daily and Seasonal Rhythms

Underwood

Wassmer

Page

1997

Comprehensive Physiology

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The sections in this article are: Daily Rhythms Models and Mechanisms Circadian Pacemaking Systems in Invertebrates Pacemakers in the Arthropod Brain Circadian Pacemakers Outside the Nervous System in Insects Pacemakers in the Gastropod Retina Multioscillator Organization Identification of Output Pathways Circadian Pacemaking Systems in Vertebrates The Mammalian SCN Other Circadian Oscillators in Mammals Hypothalamic Regulation of Circadian Function in Nonmammalian Vertebrates The Pineal Organ Eyes as Clocks Photoreceptor Localization and Mechanisms of Entrainment in Invertebrates Photoreceptive Input: Invertebrates Mechanisms of Regulation of Pacemaker Phase Photoreceptor Localization and Mechanisms of Entrainment in Vertebrates Identification of Photoreceptors Mechanisms of Regulation of Pacemaker Phase Seasonality in Invertebrates Modes of Seasonality Timing of Seasonal Cycles Photoperiodic Time Measurement Mechanisms of Photoperiodic Time Measurement The Photoperiodic Timer The Photoperiodic Counter Anatomical Location of Timers and Counters Photoreceptors Circannual Rhythms Seasonality in Vertebrates Photoperiodic Time Measurement: Models and Experimental Validation Physiological Mechanisms The Pineal and Melatonin: Mammals Mechanisms of Pineal Action The Pineal and Melatonin: Nonmammalian Vertebrates Photoreceptive Inputs: Mammalian Photoreceptive Inputs: Nonmammalian Maternal–Fetal Transfer of Photoperiodic Information Circannual Rhythms Physiological Mechanisms Concluding Comments

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Synchronization of circannual cycles: a cold spring delays the cycles of thirteen-lined ground squirrels

Joy

Mrosovsky

1985

J. Comp. Physiol.

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Circannual cycles in golden-mantled ground squirrels: Lengthening of period by low temperatures in the spring phase

Cited by 14 publications

References 17 publications

Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

Daily and Seasonal Rhythms

Synchronization of circannual cycles: a cold spring delays the cycles of thirteen-lined ground squirrels

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