Herbivory on Dalbergia ecastophyllum in sandbank area of Pernambuco, Brazil
Abstract
This study aimed to test the Vigor Plant Hypothesis (VPH) and Plant Stress Hypothesis (PEH) in Dalbergia ecastophyllum (L.) Taubert a sandbank area. The first hypothesis assumes that individuals of D. ecastophyllum more vigorous branches have a higher number of galls that less vigorous. The second hypothesis assumes that the rate of herbivory (leaf removal) is higher near the sea due to the presence of more nutrients plants. 55 branches of individuals of D. ecastophyllum were chosen and measured the length of the branch, total number of leaves and total number of galls as representative variables of vigor. Were also randomly sampled leaves of 25 individuals of D. ecastophyllum in four points with a distance of 0-3 m line-sea and four points with distances >6 m line-sea. Measured the rates of herbivory to test the second hypothesis. There was no relationship between the total number of galls and the total number of leaves of the branches of D. ecastophyllum (p = 0.746) or branch length (p = 0.517), rejecting the first hypothesis. For the second hypothesis, there were differences between the sampling points (p <0.01), close to the sea where the plants were more consumed by chewing herbivores that less nearby plants.
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References
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