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9 páginas, 9 figuras.We study central-place foraging patterns of Aphaenogaster senilis ants at a\udpopulation level by video framing individual ant trajectories in a circular\udarena with a nest connected to its centre. The ants naturally leave and\udenter the nest and forage generating non-trivial movement patterns\udaround the nest. Our data analysis indicated that the trajectories observed\udcan be classified into two strategies: the risk-averse strategy, which involves\udwandering around the nest without departing far from it and the riskprone\udstrategy, which involves long exploration paths with periodic returns\udto the central region, nearby the nest. We found that both risk-prone and\udrisk-averse strategies exhibit qualitatively the same reorientation patterns,\udwith the time between consecutive reorientations covering a wide range of\udscales, and fitting a stretched exponential function. Nevertheless, differences\udin the temporal scales and the time variability of such reorientation events\uddiffer, together with other aspects of motion, such as average speed and\udturns. Our results give experimental evidence that the internal mechanisms\uddriving reorientations in ants tend to favour frequently long relocations, as\udtheory predicts for efficient exploration in patchy landscapes, but ants\udengaged in central-place foraging can modulate such behaviour to control\uddistances from the nest. Previous works on the species support the idea\udthat risk-prone and risk-averse strategies may reflect actual differences\udbetween individuals age and experience; these factors (age and experience)\udshould be then relevant in modulating the internal reorientation clocks.\udTo support the validity of our findings, we develop a random-walk model\udcombining stretched exponential reorientation clocks with klinokinesis\udthat fits the time length and the travelled distance distributions of the\udobserved trajectories.This research has been partially supported by grants\udno. FIS 2012-32334 (V.M., D.C.), SGR 2009-00164 (V.M., D.C.). F.B.\udacknowledges the support of the Ministerio de Economı´a y Competitividad\ud(grant nos. 2009-04133 and BFU2010-22337) and the Human\udFrontier Science Program (grant no. RGY0084/2011).Peer reviewe

Reorientation patterns in central-place foraging: internal clocks and klinokinesis