INVESTIGADORES
FARJI-BRENER Alejandro Gustavo
artículos
Título:
Direct and indirect effects of soil structure on the density of an antlion larva in a tropical dry forest.
Autor/es:
FARJI-BRENER, AG; CARVAJAL, D; GEI, M.; OLANO, J.; SÁNCHEZ, J.
Revista:
ECOLOGICAL ENTOMOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2008 vol. 33 p. 183 - 188
ISSN:
0307-6946
Resumen:
We used structural equation models to discriminate direct and indirect effects of soil structure on the abundance of the antlion Myrmeleon crudelis, a neuropteran larva that digs conical pits in soil to capture small arthropods.  We proposed that soil structure may modify antlion density indirectly through its influence on tree cover, which in turn directly alters the amount of sun and rain that can reach the forest floor and the amount of litter fall. The proportion of finer soils affected positively antlion density directly, but negatively tree cover. Tree cover affected positively both the amount of leaf litter and antlion density. Leaf litter affected negatively antlion density. The indirect effects of soils varied in strength and sign depending whether trees are considered shelters against sun and rain, or leaf litter sources. The relative importance of these effects might also vary between years and seasons. Antlions may select patches of finer soils not only because are easy substrates in which to build pits, but also for its indirect benefit as sites with low leaf litter, illustrating how indirect interactions may affect the local abundance of semi-sedentary insects.