Mineralogical and textural characteristics of nest building geomaterials used by three sympatric mud-nesting hirundine species.

Pairwise comparisons performed with Mann-Whitney U-test between the species showed that there was a marginally significant difference in the mean grain size between the Barn and the Red-rumped Swallows (U = 8, p = 0.043) but a non-significant trend between the Barn Swallows and the House Martins (U = 12, p = 0.058).

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In this case, the mean grain size presented a marginal trend towards a significant difference among the three species (Kruskal-Wallis H = 6.23, p = 0.044), whereas the observed differences in the sorting of the grains and the Qz content were not statistically significant (Kruskal-Wallis H = 3.84, p = 0.146 and H = 4.97, p = 0.083, respectively).

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