Spatial distribution of insect guilds in a tropical montane rainforest : effects of canopy structure and numerically dominant ants.
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2015
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Insect guild abundance and species richness
responses to numerically dominant ant species, seasonality,
and canopy structure were analysed in a successional
montane tropical rainforest. Samples were taken in wet and
dry seasons at three sites that had been subject to different
past land use (low, intermediate, and high disturbance) and
have been protected since 1967. We took two habitat scales
(isolated tree crowns and canopy segments) and three
categories for numerically dominant ants (presence of only
one, or more than one species, or absence of dominant ant).
Our results show that the larger the crown is, the bigger the
chance to find herbivores is. Total insect species abundance,
sap-sucking species richness, and prey abundance were
higher in the low disturbance site, where the largest crowns
were found, but simpler canopies showed the greatest frequency
of dominant ants, and the lowest abundance of
chewing insects. Sap-sucking species were more abundant
in the low disturbance site, but mostly on crowns with
dominant ant species. Dominant ant abundance was higher,
and leaf-chewer species abundance was lower, in the high
disturbance site. At the canopy scale, sap-sucking and prey
species abundance and richness were higher in the low
disturbance site, where canopy heterogeneity was the
greatest, whereas leaf-chewers did not respond to disturbance
at all. Sap-sucking species abundance was higher in
areas with a simple ant species dominance. This is the first
work to show how canopy insects are concomitantly
affected by numerically dominant ants and canopy structure
in this Atlantic rainforest ecosystem.
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Atlantic forest, Brazil, Itacolomi State Park, Trophobiosis
Citação
LOURENÇO, G. M.; CAMPOS, R. B. F.; RIBEIRO, S. P. Spatial distribution of insect guilds in a tropical montane rainforest: effects of canopy structure and numerically dominant ants. Arthropod-Plant Interactions, v. 9, p. 163–174, 2015. Disponível em: <https://link.springer.com/article/10.1007/s11829-015-9359-y>. Acesso em: 20 de jul. 2017.