Co-existence Of Ants And Termites In Cecropia Pachystachya Trécul (urticaceae)

Individuals of Cecropia pachystachya Trécul (Urticaceae) host Azteca (Hymenoptera: Formicidae) colonies in their hollow internodes and feed them with glycogen bodies produced in modified petiole bases (trichilia). In turn, ants keep trees free from herbivores and lianas. Here, we report for the first time the association of nests of Nasutitermes ephratae Rambur (Isoptera: Termitidae) with these trees, in South-Pantanal (Brazil). We aimed to describe the Cecropia-ant-termite relationship and to investigate how their coexistence is made possible. We hypothesize that: 1) The frequency of termite nests in C. pachystachya is lower than in neighbor trees; 2) Termite nests occur in trees with lower density of foraging ants; 3) The time that ants take to find and remove live termite baits in C. pachystachya trees is lower in leaves (close to trichilia) than in trunks; 4) Termite nests are fixed preferentially in the smallest and less branched trees; and 5) Termite nests are fixed preferentially distant from the canopies. Unexpectedly, termitaria occurred in C. pachystachya at the same frequency as in other tree species; there was no relationship between ant patrol activity and the occurrence of termite nests in C. pachystachya; and they occurred mainly in the tallest and more branched trees. However, termite nests generally were fixed in the trunk, fork or basal branches, where there is better physical support and ant patrol is more modest. The segregation of termite and ant life-areas may represent a escape strategy of termites in relation to ants inhabiting C. pachystachya, specially during nest establishment. 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Velocity-space sensitivity of the time-of-flight neutron spectrometer at JET

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New insights into the genetic etiology of Alzheimer's disease and related dementias

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