scholarly journals Maternity-related plasticity in circadian rhythms of bumble-bee queens

2011 ◽  
Vol 278 (1724) ◽  
pp. 3510-3516 ◽  
Author(s):  
Ada Eban-Rothschild ◽  
Selma Belluci ◽  
Guy Bloch
Keyword(s):  
Life Cycle ◽  
Locomotor Activity ◽  
Circadian Rhythms ◽  
Circadian Clock ◽  
Bombus Terrestris ◽  
Colony Founding ◽  
Bumble Bee ◽  
Maternal Behaviour ◽  
Life Cycle Stages ◽  
Worker Caste

Unlike most animals studied so far in which the activity with no circadian rhythms is pathological or linked to deteriorating performance, worker bees and ants naturally care for their sibling brood around the clock with no apparent ill effects. Here, we tested whether bumble-bee queens that care alone for their first batch of offspring are also capable of a similar chronobiological plasticity. We monitored locomotor activity of Bombus terrestris queens at various life cycle stages, and queens for which we manipulated the presence of brood or removed the ovaries. We found that gynes typically emerged from the pupae with no circadian rhythms, but after several days showed robust rhythms that were not affected by mating or diapauses. Colony-founding queens with brood showed attenuated circadian rhythms, irrespective of the presence of ovaries. By contrast, queens that lost their brood switched again to activity with strong circadian rhythms. The discovery that circadian rhythms in bumble-bee queens are regulated by the life cycle and the presence of brood suggests that plasticity in the circadian clock of bees is ancient and related to maternal behaviour or physiology, and is not a derived trait that evolved with the evolution of the worker caste.

CHANGES IN THE MORPHOLOGY AND ULTRASTRUCTURE OF THE DUFOUR'S GLAND DURING THE LIFE CYCLE OF THE BUMBLE BEE QUEEN, BOMBUS TERRESTRIS L. (HYMENOPTERA: BOMBINI)

1999 ◽  
Vol 49 (4) ◽  
pp. 251-261 ◽  
Author(s):  
Fabio Camargo Abdalla ◽  
Hayo Velthuis ◽  
Carminda Da Cruz-Landim ◽  
Marie Jose Duchateau
Keyword(s):  
Life Cycle ◽  
Bombus Terrestris ◽  
Bumble Bee ◽  
Dufour's Gland ◽  
Dufour’S Gland

scholarly journals Role of mutation of the circadian clock gene Per2 in cardiovascular circadian rhythms

2010 ◽  
Vol 298 (3) ◽  
pp. R627-R634 ◽  
Author(s):  
Ana Vukolic ◽  
Vladan Antic ◽  
Bruce N. Van Vliet ◽  
Zhihong Yang ◽  
Urs Albrecht ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Locomotor Activity ◽  
Circadian Rhythms ◽  
Circadian Clock ◽  
Mutant Mice ◽  
Constant Darkness ◽  
Wild Type ◽  
Chi Square ◽  
Dark Light

Alterations in the circadian blood pressure pattern are frequently observed in hypertension and lead to increased cardiovascular morbidity. However, there are no studies that have investigated a possible implication of the Period2 gene, a key component of the molecular circadian clock, on the circadian rhythms of blood pressure and heart rate. To address this question, we monitored blood pressure, heart rate, and locomotor activity 24 h a day by telemetry in mice carrying a mutation in the Period2 gene and in wild-type control mice. Under a standard 12:12-h light-dark cycle, mutant mice showed a mild cardiovascular phenotype with an elevated 24-h heart rate, a decreased 24-h diastolic blood pressure, and an attenuation of the dark-light difference in blood pressure and heart rate. Locomotor activity was similar in both groups and did not appear to explain the observed hemodynamic differences. When mice were placed under constant darkness during eight consecutive days, wild-type mice maintained 24-h rhythms, whereas there was an apparent progressive loss of 24-h rhythm of blood pressure, heart rate, and locomotor activity in mutant mice. However, a chi square periodogram revealed that circadian rhythms were preserved under complete absence of any light cue, but with shorter periods by ∼40 min, leading to a cumulative phase shift toward earlier times of ∼5 h and 20 min by the end of the 8th day. When heart rate, mean arterial pressure, and activity were recalculated according to the endogenous circadian periods of each individual mouse, the amplitudes of the circadian rhythms (“subjective night”-“subjective day” differences) were maintained for all variables studied. Our data show that mutation of the Period2 gene results in an attenuated dipping of blood pressure and heart rate during both light-dark cycles and constant darkness, and in shorter circadian periods during constant darkness.

scholarly journals Accounting for imperfect detection in species with sessile life cycle stages: a case study of bumble bee nests

2019 ◽  
Vol 23 (5-6) ◽  
pp. 945-955 ◽  
Author(s):  
David T. Iles ◽  
Genevieve Pugesek ◽  
Natalie Z. Kerr ◽  
Nicholas N. Dorian ◽  
Elizabeth E. Crone
Keyword(s):  
Life Cycle ◽  
Bumble Bee ◽  
Imperfect Detection ◽  
Life Cycle Stages

scholarly journals Changes in the Morphology and Ultrastructure of the Dufour's Gland During the Life Cycle of the Bumble Bee Queen, Bombus Terrestris L. (Hymenoptera: Bombini)

1999 ◽  
Vol 49 (4) ◽  
pp. 251-261
Author(s):  
Hayo Velthuis ◽  
Fábio Camargo Abdalla ◽  
Carminda DA CRUZ-LANDIM ◽  
Marie José Duchateau
Keyword(s):  
Life Cycle ◽  
Bombus Terrestris ◽  
Bumble Bee ◽  
Dufour's Gland ◽  
Dufour’S Gland

Identification of the suprachiasmatic nucleus in birds

2001 ◽  
Vol 280 (4) ◽  
pp. R1185-R1189 ◽  
Author(s):  
Takashi Yoshimura ◽  
Shinobu Yasuo ◽  
Yoshikazu Suzuki ◽  
Eri Makino ◽  
Yuki Yokota ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Circadian Rhythms ◽  
Circadian Clock ◽  
Suprachiasmatic Nucleus ◽  
Japanese Quail ◽  
Clock Genes ◽  
Biological Clock ◽  
Circadian Oscillators ◽  
Circadian Clock Genes ◽  
Dim Light

Circadian rhythms are generated by an internal biological clock. The suprachiasmatic nucleus (SCN) in the hypothalamus is known to be the dominant biological clock regulating circadian rhythms in mammals. In birds, two nuclei, the so-called medial SCN (mSCN) and the visual SCN (vSCN), have both been proposed to be the avian SCN. However, it remains an unsettled question which nuclei are homologous to the mammalian SCN. We have identified circadian clock genes in Japanese quail and demonstrated that these genes are expressed in known circadian oscillators, the pineal and the retina. Here, we report that these clock genes are expressed in the mSCN but not in the vSCN in Japanese quail, Java sparrow, chicken, and pigeon. In addition, mSCN lesions eliminated or disorganized circadian rhythms of locomotor activity under constant dim light, but did not eliminate entrainment under light-dark (LD) cycles in pigeon. However, the lesioned birds became completely arrhythmic even under LD after the pineal and the eye were removed. These results indicate that the mSCN is a circadian oscillator in birds.

scholarly journals Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers

2020 ◽  
Author(s):  
Atul Pandey ◽  
Uzi Motro ◽  
Guy Bloch
Keyword(s):  
Circadian Rhythms ◽  
Juvenile Hormone ◽  
Bombus Terrestris ◽  
Bumble Bee ◽  
Early Age ◽  
Ovarian Activity ◽  
Physiological Processes ◽  
The Social ◽  
Free Running ◽  
Wax Production

AbstractThe circadian and endocrine systems influence many physiological processes in animals, but little is known on the ways they interact in insects. We tested the hypothesis that juvenile hormone (JH) influences circadian rhythms in the social bumble bee Bombus terrestris. JH is the major gonadotropin in this species coordinating processes such as vitellogenesis, oogenesis, wax production, and behaviors associated with reproduction. It is unknown however, whether it also influences circadian processes. We topically treated newly-emerged bees with the allatoxin Precocene-I (P-I) to reduce circulating JH titers and applied the natural JH (JH-III) for replacement therapy. We repeated this experiment in three trials, each with bees from different source colonies. Measurements of ovarian activity confirmed that our JH manipulations were effective; bees treated with P-I had inactive ovaries, and this effect was fully reverted by subsequent JH treatment. We found that JH augments the strength of circadian rhythms and the pace of rhythm development in individually isolated newly emerged worker bees. JH manipulation did not affect the free-running circadian period, overall level of locomotor activity, or the amount of sleep. Given that acute manipulation at an early age produced relatively long-lasting effects, we propose that JH effect on circadian rhythms is mostly organizational, accelerating the development or integration of the circadian system.

Interruption of the rat circadian clock by short light-dark cycles

2003 ◽  
Vol 284 (5) ◽  
pp. R1255-R1259 ◽  
Author(s):  
Setsuo Usui ◽  
Terue Okazaki ◽  
Yoshiko Honda
Keyword(s):  
Locomotor Activity ◽  
Circadian Rhythms ◽  
Circadian Clock ◽  
Constant Darkness ◽  
Sprague Dawley ◽  
Light Stimulation ◽  
Behavioral Rhythms ◽  
Light Pulses ◽  
Sprague Dawley Rats

Ninety male Sprague-Dawley rats were exposed to 1:1-h light-dark (LD1:1) cycles for 50–90 days, and then they were released into constant darkness (DD). During LD1:1 cycles, behavioral rhythms were gradually disintegrated, and circadian rhythms of locomotor activity, drinking, and urine 6-sulfatoxymelatonin excretion were eventually abolished. After release into DD, 44 (49%) rats showed arrhythmic behavior for >10 days. Seven (8%) animals that remained arrhythmic for >50 days in DD were exposed to brief light pulses or 12:12-h light-dark cycles, and then they restored their circadian rhythms. These results indicate that the circadian clock was stopped, at least functionally, by LD1:1 cycles and was restarted by subsequent light stimulation.

scholarly journals Accounting for imperfect detection in species with sessile life cycle stages: a case study of bumble bee colonies

2019 ◽  
Author(s):  
David T. Iles ◽  
Genevieve Pugesek ◽  
Natalie Z. Kerr ◽  
Nicholas N. Dorian ◽  
Elizabeth E. Crone
Keyword(s):  
Life Cycle ◽  
Population Distribution ◽  
Survey Methods ◽  
Bumble Bee ◽  
List Type ◽  
Imperfect Detection ◽  
Nesting Ecology ◽  
Mark Recapture ◽  
Life Cycle Stages ◽  
Bee Colonies

AbstractFor bumble bees, colonies (not individual workers) are the functional unit of the population. Estimates of colony density are thus critical for understanding population distribution and trends of this important pollinator group. Yet, surveys of bumble bee colonies and other taxa with sessile life cycle states rarely account for imperfect detection.Here we demonstrate the use of mark-recapture methods to estimate the density of bumble bee colonies across the landscape using standardized survey protocols.We found that the probability of detecting colonies in standardized surveys varied considerably across space, through time, and among colonies.Using simulations, we also show that imperfect detection can obscure true variation in density among plots, or generate spurious variation in counts even when all plots have the same density. In both cases, we show that mark-recapture can be used to generate unbiased estimates of density, with relatively low search effort compared to conventional survey methods for bumble bee colonies.Our study illustrates the advantages of mark-recapture for optimizing survey protocols for species with cryptic and sessile life cycle stages, which will be a valuable tool in ongoing studies of pollinator nesting ecology.

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