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Edge-induced narrowing of dietary diversity in leaf-cutting ants

Published online by Cambridge University Press:  01 November 2010

P.F. Falcão ,
S.R.R. Pinto ,
R. Wirth  and
I.R. Leal
P.F. Falcão
Affiliation:
Programa de Pós-Graduação em Biologia Vegetal, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego, s/n, Cidade Universitária, 50670-901, Recife, PE, Brazil
S.R.R. Pinto
Affiliation:
Programa de Pós-Graduação em Biologia Vegetal, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego, s/n, Cidade Universitária, 50670-901, Recife, PE, Brazil
R. Wirth
Affiliation:
Plant Ecology and Systematics, University of Kaiserslautern, PO-Box 3049, 67663 Kaiserslautern, Germany
I.R. Leal*
Affiliation:
Departamento de Botânica, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego s/no, 50670-901 Recife, PE, Brazil
*
*Author for correspondence Fax: 55-81-21268348 E-mail: [email protected]
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Abstract

Much of the ecological alteration faced by human-modified Neotropical forests can be assigned to edge effects, including the proliferation of some voracious herbivores such as leaf-cutting ants. However, the underlying mechanisms/impacts of tropical forest edge on herbivores performance and their foraging behaviour (e.g. dietary diversity) have rarely been investigated. The goal of this study was, therefore, to determine whether and how the annual diet (i.e. species richness, diversity and the relative proportion of pioneer versus non-pioneer species of plant materials) of Atta cephalotes colonies differs in the forest edge versus the interior zone of a large remnant of Atlantic forest in northeastern Brazil. Among the key results was a strong habitat effect on dietary diversity (explaining ca. 40–50% of the variation), which, in edge colonies, decreased approximately by one fourth compared to interior colonies (inverse of Simpson's index: 3.7±0.84 versus 4.99±0.95). There was a predominance of leaf fragments collected from pioneer species in the diet in both habitat (86% in edge and 80.4% in interior). Edge colonies collected proportionally more fragments from pioneer species than colonies located in the forest interior. Our results are the first to demonstrate an edge-mediated relaxation of dietary restrictions in leaf-cutting ants. These findings render robust support to previous evidence indicating the reduction of bottom-up forces as a key factor explaining both edge-induced hyper-abundance and increased herbivory of leaf-cutting ants in human-modified Neotropical landscapes.

Keywords

Atta cephalotesbottom-up controlBrazilian Atlantic forestdiet breadthedge effectsforaging behaviourfungus-culturingherbivorypioneer trees
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 3 , June 2011 , pp. 305 - 311
Copyright
Copyright © Cambridge University Press 2010

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References

Almeida, W.R., Wirth, R. & Leal, I.R. (2008) Edge-mediated reduction of phorid parasitism on leaf-cutting ants in a Brazilian Atlantic forest. Entomologia Experimentalis et Applicata 129, 251–257.Google Scholar
Benitez-Malvido, J. & Lemus-Albor, A. (2005) The seedling community of tropical rain forest edges and its interaction with herbivores and pathogens. Biotropica 37, 301–313.CrossRefGoogle Scholar
Bieber, A.G.D., Oliveira, M.A., Wirth, R., Tabarelli, M. & Leal, I.R. Do abandoned nests of leaf-cutting ants enhance plant recruitment in the Atlantic Forest? Austral Ecology 36, in press (doi: 10.1111/j.1442-9993.2010.02141.x).Google Scholar
Bitancourt, A. (1941) Expressão matemática do crescimento de formigueiros de Atta sexdens rupropilosa representado pelo aumento do numero de olheiros. Arquivos do Instituto Biológico de São Paulo 12, 229–236.Google Scholar
Blanton, C.M. & Ewel, J.J. (1985) Leaf-cutting ant herbivory in successional and agricultural tropical ecosystems. Ecology 66, 861–869.Google Scholar
Broadbent, E.N., Asner, G.P., Keller, M., Knapp, D.E., Oliveira, P.J.C. & Silva, J.N. (2008) Forest fragmentation and edge effects from deforestation and selective logging in the Brazilian Amazon. Biological Conservation 141, 1745–1757.Google Scholar
Clarke, K.R. & Gorley, R.N. (2001) Primer: User manual/Tutorial. Version 5. Plymouth, PRIMER-E Ltd.Google Scholar
Cochrane, M.A. & Laurance, W.F. (2002) Fire as a large-scale edge effect in Amazonian forests. Journal of Tropical Ecology 18, 311–325.Google Scholar
Coley, P.D. & Barone, J.A. (1996) Herbivory and plant defenses in tropical forests. Annual Review of Ecology and Systematics 27, 305–335.Google Scholar
Condit, R., Pitman, N., Leigh, E.G., Chave, J., Terborgh, J., Foster, R., Nuñez, P.V., Aguilar, S., Valencia, R., Gorky, V., Muller-Landau, H.C., Losos, E. & Hubbell, S. (2002) Beta-diversity in tropical forest trees. Science 295, 666–669.CrossRefGoogle ScholarPubMed
Corrêa, M.M., Bieber, A.G.D., Wirth, R. & Leal, I.R. (2005) Occurrence of Atta cephalotes (Linnaeus) (Hymenoptera: Formicidae) in Alagoas, Northeast Brazil. Neotropical Entomology 34, 695–698.Google Scholar
Corrêa, M.M., Silva, P.S.D., Wirth, R., Tabarelli, M. & Leal, I.R. (2010) How leaf-cutting ants impact forests: drastic nest effects on light environment and plant assemblages. Oecologia 162, 103–115.Google Scholar
Farji-Brener, A.G. (2001) Why are leaf-cutting ants more common in early secondary forests than in old-growth tropical forests? An evaluation of the palatable forage hypothesis. Oikos 92, 169–177.Google Scholar
Fowler, H.G. (1983) Distribution patterns of Paraguayan leaf-cutting ants (Atta and Acromyrmex) (Formicidae: Attini). Studies on Neotropical Fauna Environment 18, 121–138.Google Scholar
Garrettson, M., Stetzel, J., Halpern, B., Hearn, J., Lucey, B. & Mckone, M. (1998) Diversity and abundance of understory plants on active and abandoned nest of leaf-cutting ants (Atta cephalotes) in Costa Rica rain forest. Journal of Tropical Ecology 14, 17–26.CrossRefGoogle Scholar
Girão, L.C., Lopes, A.V., Tabarelli, M. & Bruna, E.M. (2007) Changes in Tree Reproductive Traits Reduce Functional Diversity in a Fragmented Atlantic Forest Landscape. PLoS ONE 2, e908.CrossRefGoogle Scholar
Grillo, A.S., Oliveira, M.A. & Tabarelli, M. (2006) Árvores. pp. 191–216 in Pôrto, K., Almeida-Cortez, J.S. & Tabarelli, M. (Eds) Diversidade Biológica e Conservação da Floresta Atlântica ao Norte do Rio São Francisco. Série Biodiversidade n◦ 14. Brasília, Brazil, Ministério do Meio Ambiente.Google Scholar
Harper, K.A., Macdonald, S.E., Burton, P.J., Chen, J.Q., Brosofske, K.D., Saunders, S.C., Euskirchen, E.S., Roberts, D., Jaiteh, M.S. & Esseen, P.A. (2005) Edge influence on forest structure and composition in fragmented landscapes. Conservation Biology 19, 768–782.Google Scholar
Hartshorn, G.S. (1978) Treefalls and tropical forest dynamics. pp. 617–638 in Tomlinson, P.B. & Zimmermann, M.H. (Eds) Tropical Trees as Living Systems. Cambridge, UK, Cambridge University Press.Google Scholar
Howard, J.J., Cazin, J. & Wiemer, D.F. (1988) Toxicity of terpenoid deterrents to the leaf-cutting ant Atta cephalotes and its mutualistic fungus. Journal of Chemical Ecology 14, 59–69.CrossRefGoogle Scholar
Hulme, P.E. (1996) Herbivory, plant regeneration, and species coexistence. Journal of Ecology 84, 609–615.Google Scholar
IBGE (1985) Atlas Nacional do Brasil: Região Nordeste. Rio de Janeiro, Brazil, IBGE.Google Scholar
Krebs, C. (1999) Ecological Methodology. Menlo Park, CA, Addison Wesley.Google Scholar
Laurance, W.F. (2002) Hyperdynamism in fragmented habitats. Journal of Vegetation Science 13, 595–602.Google Scholar
Laurance, W.F., Lovejoy, T.E., Vasconcelos, H.L., Bruna, E.M., Didham, R.K., Stouffer, P.C., Gascon, C., Bierregaard, R.O. Jr, Laurance, S.L. & Sampaio, E. (2002) Ecosystem decay of Amazonian forest fragments: a 22-year investigation. Conservation Biology 16, 605–618.Google Scholar
Meyer, S.T. (2008) Ecosystem engineering in fragmented forests: edge-mediated hyper-abundance of leaf-cutting ants and resulting impacts on forest structure, microclimate and regeneration. PhD thesis, University of Kaiserslautern, Kaiserslautern, Germany.Google Scholar
Meyer, S.T., Leal, I.R. & Wirth, R. (2009) Persisting hyper-abundance of keystone herbivores (Atta sp.) at the edge of an old Brazilian Atlantic Forest fragment. Biotropica 41, 711–716.CrossRefGoogle Scholar
Nascimento, H.E.M. & Laurance, W.F. (2004) Biomass dynamics in Amazonian forest fragments. Ecological Applications 14, 127–138.Google Scholar
Oliveira, M.A., Grillo, A.S. & Tabarelli, M. (2004) Forest edge in the Brazilian Atlantic forest: drastic changes in tree species assemblages. Oryx 38, 389–394.CrossRefGoogle Scholar
Pôrto, K.C., Almeida-Cortez, J.S. & Tabarelli, M. (2006) Diversidade Biológica da Floresta Atlântica ao Norte do Rio São Francisco. Série Biodiversidade n◦ 14. Brasília, Brazil, Ministério do Meio Ambiente.Google Scholar
Pyke, G.H. (1984) Optimal foraging theory: a critical review. Annual Review of Ecology and Systematics 15, 523–575.CrossRefGoogle Scholar
Rao, M. (2000) Variation in leaf-cutter ant (Atta sp.) densities in forest isolates: the potential role of predation. Journal of Tropical Ecology 16, 209–225.CrossRefGoogle Scholar
Rockwood, L.L. (1973) Distribution, density, and dispersion of two species of Atta (Hymenoptera: Formicidae) in Guanacaste province, Costa Rica. Journal of Animal Ecology 42, 803–817.Google Scholar
Rockwood, L.L. (1976) Plant selection and foraging patterns in two species of leaf-cutting ants (Atta). Ecology 57, 48–61.Google Scholar
Rockwood, L.L. & Hubbell, S.P. (1987) Host-plant selection, diet diversity, and optimal foraging in a tropical leaf-cutting ant. Oecologia 74, 55–61.Google Scholar
Santos, A.M.M., Silva, J.M.C. & Tabarelli, M. (2007) Biogeographical relationships among tropical forests in northeastern Brazil. Journal of Biogeography 34, 437–446.Google Scholar
Santos, B.A., Peres, C.A., Oliveira, M.A., Grillo, A., Alves-Costa, C.P. & Tabarelli, M. (2008) Drastic erosion in functional attributes of tree assemblages in Atlantic forest fragments of northeastern Brazil. Biological Conservation 141, 249–260.Google Scholar
Shepherd, J.D. (1985) Adjusting foraging effort to resources in adjacent colonies of the leaf-cutter ant, Atta colombica. Biotropica 17, 245–252.Google Scholar
Silva, J.M.C. & Tabarelli, M. (2000) Tree species impoverishment and the future flora of the Atlantic Forest of Northeast Brazil. Nature 404, 72–74.Google Scholar
Silva, P.S.D., Bieber, A.G.D., Leal, I.R., Wirth, R. & Tabarelli, M. (2009) Decreasing abundance of leaf-cutting ants across a chronosequence of advancing Atlantic forest regeneration. Journal of Tropical Ecology 25, 223–227.Google Scholar
StatSoft Inc. (2001) STATISTICA (Data analysis sofware system), version 6. Tulsa, OK, Statsoft, Inc.Google Scholar
Tabarelli, M., Lopes, A.V. & Peres, C.A. (2008) Edge-effects drive tropical forest fragments towards an early-successional system. Biotropica 40, 657–665.Google Scholar
Terborgh, J., Lopez, L., Nunez, P., Rao, M., Shahabuddin, G., Orihuela, G., Riveros, M., Ascanio, R., Adler, G.H., Lambert, T.D. & Balbas, L. (2001) Ecological meltdown in predator-free forest fragments. Science 294, 1923–1926.Google Scholar
Urbas, P. (2004) Effects of forest fragmentation on bottom-up control in leaf-cutting ants. PhD thesis, University of Kaiserslautern, Kaiserslautern, Germany.Google Scholar
Urbas, P., Araújo, M.V. Jr, Leal, I.R. & Wirth, R. (2007) Cutting more from cut forests: edge effects on foraging and herbivory of leaf-cutting ants in Brazil. Biotropica 39, 489–495.Google Scholar
Vasconcelos, H.L. (1997) Foraging activity of an Amazonian leaf-cutting ant: responses to changes in the availability of woody plants and to previous plant damage. Oecologia 112, 370–378.Google Scholar
Vasconcelos, H.L. & Fowler, H.G. (1990) Foraging and fungal substrate selection by leaf-cutting ants. pp. 411–419 in Vander Meer, R.K., Jaffe, K. & Cedeno, A. (Eds) Applied Myrmecology – A World Perspective. Boulder, CO, Westview Press.Google Scholar
Veloso, H.P., Rangel-Filho, A.L.R. & Lima, J.C.A. (1991) Classificação da Vegetação Brasileira, Adaptada a um Sistema Universal. Rio de Janeiro, Brazil, IBGE.Google Scholar
Williams-Linera, G., Domiguez-Gastelu, V. & Garcia-Zurita, M.E. (1998) Microenvironment and floristics of different edges in a fragmented tropical rainforest. Conservation Biology 12, 1091–1102.Google Scholar
Wirth, R., Beyschlag, W., Herz, H., Ryel, R.J. & Hölldobler, B. (2003) Herbivory of leaf-cutter ants: a case study of Atta colombica in the tropical rainforest of Panama. Ecological Studies 164, 1–233.CrossRefGoogle Scholar
Wirth, R., Meyer, S.T., Almeida, W.R., Araújo, M.V. Jr, Barbosa, V.S. & Leal, I.R. (2007) Increasing densities of leaf-cutting ants (Atta spp.) with proximity to the edge in a Brazilian Atlantic forest. Journal of Tropical Ecology 23, 501–505.CrossRefGoogle Scholar
Wirth, R., Meyer, S.T., Leal, I.R. & Tabarelli, M. (2008) Plant-herbivore interactions at the forest edge. Progress in Botany 68, 423–448.Google Scholar
Whitmore, T.C. (1997) Tropical forest disturbance, disappearance, and species loss. pp. 3–12 in Laurance, W.F. & Bierregaard, R.O. Jr (Eds) Tropical Forest Remnants: Ecology, Management, and Conservation of Fragmented Communities. Chicago, IL, University of Chicago Press.Google Scholar
Zar, J.H. (1999) Biostatistical Analysis. Upper Saddle River, NJ, Prentice-Hall Inc.Google Scholar
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