org> Subject: [Pollinator] Fwd: "Heat reward for insect pollinators"|
11/20/2003 10:38 AM
Some of you may be interested in this paper in Nature.
>Nature 426, 243 - 244 (20 November 2003)
>Environmental biology: Heat reward for insect pollinators
>ROGER S. SEYMOUR*, CRAIG R. WHITE* & MARC GIBERNAU?
>* Environmental Biology, University of Adelaide, Adelaide 5005, Australia
>? Laboratoire d'?volution et Diversit? Biologique, Universit? Paul
>31062 Toulouse, France
>In neotropical forests, adults of many large scarab beetle species spend
>most of their time inside the floral chambers of heat-producing flowers,
>where they feed and mate throughout the night and rest during the
>day, before briefly flying to another flower. Here we measure floral
>temperatures in Philodendron solimoesense (Araceae) in French Guiana and
>respiration rates of Cyclocephala colasi beetles at floral and ambient
>temperatures, and show that the beetles' extra energy requirements for
>activity are 2.0-4.8 times greater outside the flower than inside it. This
>finding indicates that heat produced by the flower constitutes an
>energy reward to pollinators, allowing them to feed and mate at a fraction
>of the energy cost that would be required outside the flower.