As I read Donze (quoted below) the longest feeding periods are during the
pupal stage and last on average 8.25 minutes (495 seconds) up to a max of
about 12.5 minutes (749 seconds) I am not sure that that challenges
Ramsey's explanation. I was just wondering if I am missing something. Joe
Upstate NY
Feeding pattern of Varroa mother
The feeding pattern of the mother varies greatly during
the course of the reproduction cycle (Fig. 5). On the prepupa
she feeds often (hl _+0.36 bouts h -1, n = 13 individuals)
but for short periods (161 _+ 109 s per bout, n = 425)
and there is still no preference for a particular segment as
a feeding site. Although the Varroa female often changes
location she always feeds on the abdominal pleural pads
(523 of 525 observations). On the contrary, during the
pupal stage she feeds less often (0.34_+0.04 bouts h -1,
n = 10 females) but longer than on the prepupa
(495_+254s per bout, n = 127; P<0.0001, Student ttest),
and always at the same site (see below). Despite
these differences the mean duration of feeding per unit
time is exactly the same (173_+46 and 173+51 s h -I,
n = 13 and 10 individuals for prepupal and pupal stages,
respectively; P < 1.0, Student t-test). These periods correspond
to oogenesis in Varroa, considered here to occur
during the prepupal and pupal stages from 36 until
180 hpc. The 20 h following pupation when Varroa feeds
for prolonged periods were not included in these calculations
since during this period the feeding bouts are very
long, decreasing exponentially to stabilise some 15 h later
(Fig. 5). Between laying the last egg and imaginal ecdysis,
the mother feeds less often (0.12_+0.04 bouts h -~, n = 8
individuals) and for longer (693 +_259 s per bout, n = 56)
but only for 84_+18 s h i (n = 8 individuals; P<0.001,
Student t-test).
On Mon, Jan 22, 2018 at 12:27 PM, randy oliver <[log in to unmask]>
wrote:
> >
> > >Before Samuel Ramsey explanation, I had understood that predation was
> > reducing 25% of the surface of fat body of the nymph, meaning a 15%
> weight
> > reduction of the nymph.
>
>
> Allow me to step in here to help with translation. In American English,
> we'd translate the above sentence to say:
>
> I had understood that varroa parasitism of the pupa was reducing 25% of
> the surface of fat body of the pupa, meaning a 15% weight reduction of the
> pupa.
>
> Of note is that Donze found that the foundress mite spends an hour on her
> first feeding, supporting Ramsey's explanation that she may be waiting for
> extraoral digestion to take place.
>
>
> --
> Randy Oliver
> Grass Valley, CA
> www.ScientificBeekeeping.com
>
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Joe Cali
[log in to unmask]
Betterbee
8 Meader Road
Greenwich, NY 12834
800-632-3379
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