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Substrate particle size affects pit building decision and pit size in the antlion larvae Euroleon nostras (Neuroptera: Myrmeleontidae)
Devetak, Dušan ; Špernjak, Andreja, 1978- ; Janžekovič, Franc, 1962-
The larvae of the antlion Euroleon nostras are pit-builders, constructing pitfall traps in loose sand. The number of pits and the pit diameter are recorded when larvae are kept in substrates with ...different particle sizes. The most convenient pit-building sand fractions are two fractions with fine sand (<= 0.23 mm; 0.23-0.54 mm). The largest pits are constructed in sand with a particle size of 0.23-0.54 mm. In this sand fraction, larvae of all three instars most readily build pits. No pits are constructed in sand with a particle size greater than 1.54 mm. First- and second-instar larvae avoid building pits in substrates of particle size 1-1.54mm, but third-instar larvae construct pits in this sand fraction. It is assumed that the antlion is capable of distinguishing between substrate types and this hypothesis is tested by giving larvae the choice of building a pit inone of four particle-size fractions. Larvae of all three instars prefer to build pits in the fraction with a particle size of 0.23-0.54 mm. Only third-instar larvae build pits in all four fractions, but only occasionally inthe coarser fraction.
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