Sb. Isenberg et al., CROP STORAGE OF POLLEN AND ITS FUNCTIONAL-SIGNIFICANCE IN THE SOLITARY BEE, MELISSODES RUSTICA (HYMENOPTERA, APIDAE), Journal of the Kansas Entomological Society, 70(4), 1997, pp. 353-358
Crop dissections of female Melissodes rustica (Say) in northwest Arkan
sas revealed that on the last collecting trip of the day large amounts
of pollen are carried back in the crop, suggesting that this is a fee
ding trip, providing resources for self-maintenance. Females returning
to burrows in the middle of the day do not carry large amounts of pol
len or nectar in their crops. Females arriving at their burrows withou
t scopal pollen on the final trip of the day spend more time in their
burrows prior to their last trip and have shorter last trips than fema
les carrying scopal pollen at the same time. Foraging females may make
pollen and nectar-loading decisions based on whether or not they have
an active brood cell in which they can deposit externally-carried sco
pal pollen. As an important part of self-feeding, the last trip of the
day is a potentially critical aspect of nesting energetics.