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The availability of nutrients in the soil acts as a filter in the ants that inhabit this layer, affecting their foraging patterns and showing preferences or limitations on their nutritional needs. Especially in environments far from the ocean, the salt deficit can be a limiting resource in the environment. Here, we test whether changes in species richness and composition reveal food preferences for ants that inhabit the soil, using sugar and salt as attractions in an area of the Amazon Forest. In total, 21 species in nine genera were collected; all species were collected in sugar and only two in salt. In addition to the ant richness eleven times greater in sugar, the composition differed between the attractions. Our results indicate that the litter ants in the preserved forest are not limited by availability of sodium and they prefer sugar to salt as attractant, even with this environment far from the coast.

Assessing sodium limitation as a resource for ground-dwelling ants (Hymenoptera: Formicidae) in an area of the Amazonian Terra Firme Forest