Do mutualistic networks follow power distributions? |
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| Institution: | 1. Research Unit of Biodiversity (UO/CSIC/PA), Oviedo University, 33600 Mieres, Spain;2. Grimsö Wildlife Research Station, Department of Ecology, Swedish University of Agricultural Sciences (SLU), 73091 Riddarhyttan, Sweden;3. Estación Biológica de Doñana (EBD-CSIC), Américo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, Spain;4. Departamento de Bioloxía Celular e Ecoloxía, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;1. Indian Institute of Remote Sensing, Indian Space Research Organization, 4, Kalidas Road, Dehradun 248001, Uttarakhand, India;2. Department of Mathematics, School of Natural Sciences, Shiv Nadar University, Post Office Shiv Nadar University, Gautam Buddha Nagar, Greater Noida 201 314, Uttar Pradesh, India;1. CNRS, UMR 6553 Ecobio, Université Rennes 1, Campus de Beaulieu, 35042 Rennes, France;2. CNRS, UMR 6554 LETG, Université Rennes 2, Campus de Villejean, 35043 Rennes, France;1. Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal;2. MARE — Marine and Environmental Sciences Centre, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal;3. CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, InBIO, Laboratório Associado, Universidade do Porto, Campus Agrário de Vairão, 4485-661, Vairão, Portugal;4. Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, 4169-007, Porto, Portugal;5. Department of Biology & CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;6. South Iceland Research Centre, University of Iceland, Lindarbraut 4, IS-840 Laugarvatn, Iceland;7. Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal;8. Centro de Investigação de Montanha (CIMO), ESA, Instituto Politécnico de Bragança, Campus de Sta. Apolónia, 5300-253 Bragança, Portugal;9. A ROCHA, Apartado 41, 8501-903 Mexilhoeira Grande, Portugal;10. Labor — Laboratório de Ornitologia, Instituto de Ciências Agrárias e Ambientais Mediterrânicas (ICAAM), University of Évora, 7002-554 Évora, Portugal;11. Grupo de Anilhagem do Litoral Alentejano, 7630-711, Bicos – Odemira, Portugal;12. Santarém, Portugal;1. Universidad Central del Ecuador, Ciudadela Universitaria, Av. América S/N, Quito, Ecuador;2. Dpto. Ecuaciones Diferenciales y Análisis Numérico, Seville University, Spain |
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| Abstract: | Species interactions are central to the structure and dynamics of biological communities. Recently, of particular interest, is the analysis of ecological networks where the number of species to species interactions vary depending on the degree of specialization. For mutualistic networks, species degree has been suggested to follows a power distribution or a truncated power distribution. In this paper, I discuss previously estimated parameters and associated model selection may be unreliable. I use the likelihood approach and compare the results from previous findings and show that the parameter estimates as well as model selection results are indeed very different. Furthermore, the likelihood approach reveals that many mutualistic networks do not follow either power distribution or truncated power distribution. |
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