NDLI: Respiratory rhythms in stingless bee workers: circadian and ultradian components throughout adult development

Content Provider	Springer Nature Link
Author	Teixeira, Laura V. Waterhouse, Jim M. Marques, Mirian D.
Copyright Year	2011
Abstract	The workers of the stingless bee, Melipona quadrifasciata, assume different tasks during their adult life. Newly emerged individuals remain inside the nest, without contact with the external environment. Maturing workers go to more peripheral regions and only the oldest, the foragers, leave the nest. As this diversity of activities implies different metabolic patterns, oxygen consumption has been measured in workers of three different ages: 24–48 h (nurses), 10–15 days (builders), and older than 25 days (foragers). Oxygen consumption of individually isolated workers was determined by intermittent respirometry, under constant darkness and temperature of 25 ± 1°C. Sets of 24-h measurements were obtained from individuals belonging to each of the three worker groups. Rhythmicity has been assessed in the daily (24 h) and ultradian (5–14 h) domains. This experimental design allowed detection of endogenous rhythms without the influence of the social group and without inflicting stress on the individuals, as would be caused by their longer isolation from the colony. Significant 24-h rhythms in oxygen consumption were present in nurses, builders and foragers; therefore, workers are rhythmic from the age of 24–48 h. However, the amplitude of the circadian rhythm changed according to age: nurses showed the lowest values, while foragers consistently presented the largest ones, about ten times larger than the amplitude of nurses’ respiratory rhythm. Ultradian frequencies were detected for all worker groups, the power and frequencies of which varied little with age. This means that the ultradian strength was relatively larger in nurses and apparently maintains some relationship with the queen’s oviposition episodes.
Starting Page	361
Ending Page	372
Page Count	12
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	197
Issue Number	4
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-01-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stingless bees Circadian rhythms Ultradian rhythms Ontogeny Internal temporal order Neurosciences Animal Physiology Zoology
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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