Abstract
In the leaf-cutting ant Atta cephalotes (L.) small colonies produce a relatively narrow size-range of small workers, whereas large colonies produce a much wider size-range of workers. In this study, I compared the foraging of four small A. cephalotes colonies (fewer than 5000 workers) with published data on foraging of large colonies to examine how colony size and worker size-range may be related to foraging ecology in leaf-cutting ants. I found that the foraging ecology of small A. cephalotes colonies is very different from that of large colonies. In small colonies, a relatively narrow size-range of foragers (1.4–6.7 mg, mean 3.3 mg) cut primarily “herbs” (ferns, grasses, and other small herbaceous plants) located within 7 m of the nest. In contrast, in large colonies, a broader size-range of workers (1.4–30 mg, mean 7.3 mg) participate in foraging, generally harvesting from trees 20–80 m from the nest, with larger workers cutting on trees with thicker and tougher leaves. Small colonies' dependence on small herbaceous plants near the nest may have a profound impact on distribution of A. cephalotes. A. cephalotes colonies are rarely found in primary forest, where the low occurrence of small herbaceous plants in the understory may preclude the establishment of young colonies.
References
Cherrett JM (1968) The foraging behavior of Atta cephalotes L. (Hymenoptera, Formicidae) I. Foraging pattern and plant species attacked in tropical rain forest. J Anim Ecol 37: 387–403
Cherrett JM (1972) Some factors involved in the selection of vegetable substrate by Atta cephalotes (L.) (Hymenoptera: Formicidae) in tropical rain forest. J Anim Ecol 41: 647–660
Dejean A, Lachaud J-P (1992) Growth-related changes in predation behavior in incipient colonies of the ponerine ant Ectatomma tuberculatum (Olivier). Insectes Soc 39: 129–143
Feener DH Jr, Moss KAG (1990) Defense against parasites by hitchhikers in leaf-cutting ants: a quantitative assessment. Behav Ecol Sociobiol 26: 17–29
Fowler HG (1981) On the emigration of leaf-cutting ant colonies. Biotropica 13: 316
Fowler HG, Pereira-da Silva V, Forti LC, Saes NB (1986) Population dynamics of leaf-cutting ants: a brief review. In: Lofgren CS, Vander Meer RK (eds) Fire ants and leaf-cutting ants. Westview, Boulder, pp 18–35
Haines BL (1978) Element and energy flows through colonies of the leaf-cutting ant, Atta colombica, in Panama. Biotropica 10: 270–277
Hölldobler B, Wilson EO (1990) The ants. Harvard University Press, Cambridge
Lewis T, Pollard GV, Dibley GC (1974) Rhythmic foraging in the leaf-cutting ant Atta cephalotes (L.) (Formicidae: Attini). J Anim Ecol 43: 129–141
Lima AP, Moreira G (1993) Effects of prey size and foraging mode on the ontogenetic change in feeding niche of Colostethus stepheni (Anura: Dendrobatidae). Oecologia 95: 93–102
Orr MR (1993) Parasitic flies (Diptera: Phoridae) influence foraging rhythms and caste division of labor in the leaf-cutter ant, Atta cephalotes (Hymenoptera: Formicidae). Behav Ecol Sociobiol 30: 395–402
Oster GF, Wilson EO (1978) Caste and ecology in the social insects. Princeton University Press, Princeton
Pereira-da Silva V (1975) Contribuição ao estudo das populações de Atta sexdens rubropilosa Forel, e Atta laevigata (Fr. Smith) no estado de São Paulo (Hym.: Formicidae). Stud Entomol 18: 201–250
Porter SD, Tschinkel WR (1986) Adaptive value of nanitic workers in newly founded red imported fire ant colonies (Hymenoptera: Formicidae). Ann Entomol Soc Am 79: 723–726
Rayor LS, Uetz GW (1993) Ontogenetic shifts within the selfish herd: predation risk and foraging trade-offs change with age in colonial web-building spiders. Oecologia 95: 1–8
Rockwood LL (1976) Plant selection and foraging patterns in two species of leaf-cutting ants (Atta). Ecology 57: 48–61
Rockwood LL, Hubbell SP (1987) Host plant selection, diet diversity, and optimal foraging in a tropical leafcutting ant. Oecologia 74: 55–61
Schneirla TC (1971) Army ants, a study in social organization. Freeman, San Francisco
Tschinkel WR (1988) Colony growth and the ontogeny of worker polymorphism in the fire ant, Solenopsis invicta. Behav Ecol Sociobiol 22: 103–115
Vasconcelos HL (1990) Foraging activity of two species of leaf-cutting ants (Atta) in primary forest of the central Amazon. Insectes Soc 37: 131–145
Walton WE, Hairston NG Jr, Wetterer JK (1992) Growth-related constraints on diet selection by sunfish. Ecology 73: 429–437
Weber NA (1972) Gardening ants: the Attines. American Philosophical Society, Philadelphia
Werner EE, Gilliam JF (1984) The ontogenetic niche and species interactions in size-structured populations. Annu Rev Ecol Syst 15: 393–425
Wetterer JK (1990) Diel changes in forager size, activity, and load selectivity in a tropical leaf-cutting ant, Atta cephalotes. Ecol Entomol 15: 97–104
Wetterer JK (1994) Forager polymorphism, size-matching, and load delivery in the leaf-cutting ant, Atta cephalotes. Ecol Entomol 19: 57–64
Wheeler WM (1911) The ant colony as an organism. J Morphol 22: 307–325
Wilson EO (1980a) Caste and division of labor in leaf-cutter ants. I. The overall pattern in A. sexdens. Behav Ecol Sociobiol 7: 143–156
Wilson EO (1980b) Caste and division of labor in leaf-cutter ants. II. The ergonomic organization of leaf cutting. Behav Ecol Sociobiol 7: 157–165
Wilson EO (1983) Caste and division of labor in leaf-cutter ants IV. Colony ontogeny of A. cephalotes. Behav Ecol Sociobiol 14: 55–60
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Wetterer, J.K. Ontogenetic changes in forager polymorphism and foraging ecology in the leaf-cutting ant Atta cephalotes . Oecologia 98, 235–238 (1994). https://doi.org/10.1007/BF00341478
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DOI: https://doi.org/10.1007/BF00341478