Contrasting effects of sampling scale on insect herbivores distribution in response to canopy structure.
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2013
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Resumo
Species diversity of insect herbivores associated to canopy may vary local and geographically
responding to distinct factors at different spatial scales. The aim of this study was to investigate how forest canopy
structure affects insect herbivore species richness and abundance depending on feeding guilds´ specificities.
We tested the hypothesis that habitat structure affects insect herbivore species richness and abundance differently
to sap-sucking and chewing herbivore guilds. Two spatial scales were evaluated: inside tree crowns (fine spatial
scale) and canopy regions (coarse spatial scale). In three sampling sites we measured 120 tree crowns, grouped
in five points with four contiguous tree crowns. Insects were sampled by beating method from each crown and
data were summed up for analyzing each canopy region. In crowns (fine spatial scale) we measured habitat
structure: trunk circumference, tree height, canopy depth, number of ramifications and maximum ramification
level. In each point, defined as a canopy region (coarse spatial scale), we measured habitat structure using a
vertical cylindrical transect: tree species richness, leaf area, sum of strata heights and maximum canopy height. A
principal component analysis based on the measured variables for each spatial scale was run to estimate habitat
structure parameters. To test the effects of habitat structure upon herbivores, different general linear models were
adjusted using the first two principal components as explanatory variables. Sap-sucking insect species richness
and all herbivore abundances increased with size of crown at fine spatial scale. On the other hand, chewer species
richness and abundance increased with resource quantity at coarse scale. Feeding specialization, resources
availability, and agility are discussed as ecological causes of the found pattern.
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Feeding guilds, Insect distribution, Resources availability, Habitat complexity
Citação
NEVES, F. de S. et al. Contrasting effects of sampling scale on insect herbivores distribution in response to canopy structure. Revista de Biologia Tropical, v. 61, p. 125-137, 2013. Disponível em: <https://www.scielo.sa.cr/scielo.php?script=sci_abstract&pid=S0034-77442013000100009&lng=en&nrm=iso&tlng=en>. Acesso em: 20 de jul. 2017.