Gall-forming insect attack patterns: a test of the Plant Vigor and the Resource Concentration Hypotheses

Juliana Tuller, Antonio Cesar Medeiros Queiroz, Giovana Rodrigues Luz, Jhonathan Oliveira Silva

Resumo


We tested the following two hypotheses to investigate the attack patterns by gall-inducing insects on their host plant Eriotheca pubescens: (i) vigorous modules are more often attacked by galling insects; and (ii) E. pubescens trees associated with a higher density of co-specific individuals have a higher gall abundance. We collected terminal branches from the host plant to measure their module lengths and gall richness and abundance and determined the E. pubescens densities in a 5m radius around the focal individual. There was a higher availability of short branches. Among the four gall morphotypes, two preferred the higher branches, and the other two morphotypes had no shoot length preference. Gall attack did not present a relationship with the host plant density. Thus, the vigor of E. pubescens was a determining factor only for some gall morphotypes. In contrast, the resource concentration hypothesis was not important at an intraspecific level for gall attack in this system.







Palavras-chave


Embiruçú; Eriotheca pubescens; Gall-inducing insect; Plant module size

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DOI: https://doi.org/10.5007/2175-7925.2013v26n1p45

Direitos autorais 2013 Juliana Tuller, Antonio Cesar Medeiros Queiroz, Giovana Rodrigues Luz, Jhonathan Oliveira Silva

Licença Creative Commons
Esta obra está licenciada sob uma licença Creative Commons Atribuição 4.0 Internacional.

Biotemas. UFSC, Florianópolis, SC, Brasil, eISSN 2175-7925

Licença Creative Commons
Este periódico está licenciado conforme Creative Commons Atribuição 4.0 Internacional.