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Age pigment dynamics in worker-honeybees ( Apis Mellifera )

Heidem, Lars Egil S.
Master thesis
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Age pigment dynamics.pdf (2.068Mb)
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http://hdl.handle.net/11250/186520
Utgivelsesdato
2013-08-27
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  • Master's theses (KBM) [742]
Sammendrag
Growing old is often related to a decline in physiological function, performance, survival or

reproduction.(Kirkwood 2002) But studies among animals have showed that an increased

chronological age doesn’t automatically leads to these physical changes.(Rueppell, Christine et

al. 2007) Honeybees (Apis mellifera) has showed a remarkable plasticity of aging with queens

having an average lifespan of 1–2 years, while workers have an average lifespan of 140 days in

the winter and 15–38 days in the summer(Munch and Amdam 2010).

Regarded as a marker of cellular aging, lipofuscin, a fluorescent non-degradable material, will be

expected to accumulate in the cells of aging animals(Gray and Woulfe 2005; Double, Dedov et

al. 2008).

By obtaning bees of the same age, and manipulating them into different social roles in the hive,

this study could observe how the accumulation of lipofuscin can be a process controlled by other

factors then just increased chronological age. Age-matched bees from with different social roles

in the hive were sampled, and using a Leica SP5 Confocal laser scanning microscope, it was

possible to create images that enabled the quantification of lipofuscin within the tissue samples

from the bees.

The results showed a rapid accumulation pattern of lipofuscin among bees that had been engaged

in foraging activities for more than 13 days, with the bees that was engaged in nursing activities

showing no such accumulation. This illustrates the strong effect of these social factors among

honey bees, and with studies on functional senescence that show significant decline patterns for

older forager groups after about 2 weeks of foraging(Behrends, Scheiner et al. 2007; Williams,

Roberts et al. 2008), this study suggests that the accumulation of lipofuscin is more related to the

onset of senescence, then just being a harmless wear-and-tear product purely related to the

chronologically age of an animal.
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Norwegian University of Life Sciences, Ås

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