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Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X

Abstract

BOAVENTURA, Maria Gabriela; PEREIRA, Cássio Cardoso  and  CORNELISSEN, Tatiana. Plant architecture influences gall abundance in a tropical montane plant species. Acta Bot. Bras. [online]. 2018, vol.32, n.4, pp.670-674. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062018abb0038.

Sessile and host-specific herbivores, such as gall-inducing insects, are usually patchily distributed within the populations of their host plants, and it has been suggested that both inter- and intra-plant variation affect gall abundance, distribution and survivorship. Variation in plant traits, such as size and architecture, has been previously demonstrated as a determinant of gall distribution. We examined the influence of architectural complexity of the tropical plant Galianthe brasiliensis (Rubiaceae) on the abundance of the stem-galler Lopesia sp. (Diptera, Cecidomyiidae) along an elevation gradient where both insect and plant were distributed. A total of 120 plants were sampled along the gradient and more than 580 galls were counted, while plant architectural complexity was determined by a combination of height and branch ramification. Increased elevation did not influence plant complexity nor gall abundance (both P>0.05), but plant architectural complexity explained more than 60% of the variation in gall abundance along the gradient (R2=0.62, P<0.001). We suggest that the greater availability of meristematic tissues in more architecturally complex plants explains the results found, as this is a key resource for gall occurrence and establishment.

Keywords : elevation gradient; galls; insects; plant architecture hypothesis; plant quality.

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