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Natural selection in the tropical treehopper Alchisme grossa (Hemiptera: Membracidae) on two sympatric hostplants

Autor(es):
Daniel Torrico-Bazoberry, Carlos F. Pinto, Luis Flores-Prado, Francisco E. Fontúrbel & Hermann M. Niemeyer
Editorial: Springer Science+Business Media Dordrecht
Año: 2016
Páginas: 9
ISSN: 1872-8855

 

 

Reseña

Abstract The pronotum is the most distinctive and representative structure in treehoppers. Although several functions have been proposed for this structure, its involvement in fitness has not been formally evaluated. Given the high degree of maternal investment exhibited by the subsocial membracid Alchisme grossa (Hoplophorionini), the pronotum has been suggested as a shield for offspring protection. We performed selection gradient analyses on A. grossa in order to evaluate how natural selection is acting upon two traits associated with this structure considering three different fitness proxies: (1) number of eggs, (2) the ratio between the number of firststage nymphs and the number of eggs (early survival), and (3) the number of third-stage nymphs (late survival). Since A. grossa feeds, oviposits and mates on two alternative host-plants (Brugmansia suaveolens and Solanum ursinum, both Solanaceae), we also evaluated and compared selection gradients between these host-plants. We found positive

Sequestration of tropane alkaloids fromBrugmansia suaveolens(Solanaceae) by the treehopperAlchisme grossa (Hemiptera: Membracidae)

paper2

Autor(es):
Carlos F. Pinto, Silvia Salinas, Luis Flores-Prado, Javier Echeverría,
Hermann M. Niemeyer
Editorial: Elsevier
Año: 2016
Páginas: 5
ISSN: 0305-1978

 

Reseña

Treehoppers (Hemiptera: Membracidae) are sap-feeding insects distributed mainly in tropical regions.Alchisme grossais a treehopper that has been reported in the Bolivian Yungas forests using mostlyBrugmansia suaveolens(Solanaceae) as host-plant, where adult females oviposit and take care of their nymphs until they molt to adults. Brugmansiais a subtropical genus producing a variety of tropane alkaloids (TAs). We herein report the sequestration by adult males and females of A. grossa of TAs from B. suaveolens, examining separately the distinct body sections of insects. Puried extracts of A. grossa and B. sua- veolenswere analyzed by gas chromatography/mass spectrometry. TAs in A. grossa were the same as those in its host-plant; furthermore, they were equally distributed between sexes and they were differentially allocated within the body of adult individuals. An ecological role for sequestered TAs is discussed.

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