Foraging strategies and foraging plasticity in harvester ants (Pogonomyrmex spp., Hymenoptera: Formicidae) of the central Monte desert, Argentina

RODRIGO POL; FERNANDO MILESI; JAVIER LOPEZ DE CASENAVE

MYRMECOLOGICAL NEWS

OESTERREICHISCHE GESELL ENTOMOFAUNISTIK

Año: 2015 vol. 21 p. 1 - 12

1994-4136

Foraging strategy determines the way harvester ants use space and therefore their access and impact on seed resources. In this study we describe the foraging strategy of three sympatric South American species of Pogonomyrmex ants to confirm that they are solitary foragers as is suggested anecdotally in the literature. Then we tested whether those foraging strategies are fixed or flexible in response to seed density and distribution. Based on individual and group movements of foraging ants we determined that P. rastratus (MAYR, 1968) is exclusively a solitary foraging species, P. inermis (FOREL, 1914) use a group-foraging strategy with limited recruitment, and P. mendozanus (CUEZZO & CLAVER, 2009) display an intermediate foraging system in which workers are typically solitary foragers but also recruit nestmates to high-density seed patches. The addition of seeds near the nest modified the foraging behavior of the three species by different amounts. Individual foragers of each species reduced their search time and search area, and colonies increased their foraging activity rate, probably as a result of a higher returning rate of successful foragers after seed addition. Such behavioral responses were much more conspicuous in P. mendozanus than in the other two species. Flexibility in foraging and diet breadth reported for some of these harvester ants may constitute important adaptive features in the central Monte desert where seed abundance is highly heterogeneous, irregular, and severely affected by anthropic disturbances.