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       Instituto de Recursos Naturales y Agrobiología
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Dr. Teodoro Marañón Arana

Investigador científico


Department of Geoecology, Biochemistry and Environmental Microbiology (IRNAS - CSIC)

Avenida Reina Mercedes 10

P.O. Box 1052

41080 - Sevilla (Spain)

Phone: +34 95 462 47 11 ext 141

Fax: +34 95 462 40 02

E-mail: Teodoro@irnase.csic.es

General information


Born in Sevilla (1954) I am currently Scientific Researcher (promoted on 2007) in the Institute of Natural Resources and Agrobiology of Seville, belonging to the CSIC.

I had a Ph. D. in Biology for the University of Sevilla (1982) and several research fellowships, in the California University at Berkeley (USA), Cambridge University (UK), University La Sapienza at Rome (Italy), and the IPC at Cape Town (South Africa).



Research interests

My research interests cover several topics on forest ecology.


Global change and ecological interactions




I have recently started the coordination of a research project on ecological interactions and global change in Mediterranean forests, Interbos (www.irnase.csic.es/users/interbos/inicio.php). We pursue five main objectives: 1) Ecological interactions between tree and ecosystems, using neighbourhood models to study functional relationships between community composition and soil processes. 2) Leaf traits of woody species assembling the forest community; to explore the variability in key leaf traits (including structural and metabolic variables), to determine how these traits are related with plant growth and survival for different species, and to understand the consequences for ecosystem functioning, mainly through litter decomposition and primary production. 3) Mechanisms of ecological interactions within the soil subsystem, analising processes and interactions, in particular litter decomposition rates, mineralization and nutrient release, mycorrhyzas diversity, and pathogens associated with Quercus trees. 4) Responses, at individual and population levels, to the ecosystem modifications, exploring tree-soil feedback processes. 5) Mechanisms of assemblage and coexistence of tree species; to build models to synthesize project results and to predict ecosystem functioning and Global Change effects.


Ecology of forest regeneration






The dynamics of the Mediterranean forest and in particular the processes associated to the regeneration of woody species was the main objective of the project Dinamed which I coordinated during the period2006-2008 (http://www.irnase.csic.es/users/dinamed/index.php). The particular objectives were: 1) To study the ecophysiological mechanisms determining species differences, in particular during the regeneration stages, responding to light, water and nutrient conditions. 2) To study the dynamics of soil processes affecting plant regeneration. 3) To study demographical processes determining recruitment and maintenance of populations of main woody species in Mediterranean forest. 4) To study the ontogenetic changes of the regeneration niche and to identify the abiotic and biotic factors responsible of them. 5) Lastly, to use modelling techniques to analyse the forest dynamics and to simulate changes in temporal patterns, according to the foreseen scenarios of management and climatic changes.


Ecological restoration of contaminated lands





Since 1998, when the Aznalcóllar mine spill polluted about 4300 ha in the Guadiamar valley (Sevilla), I have collaborated in the monitoring of the trace element accumulation in plants and soils, and in the evaluation of the afforestation and ecological restoration carried out in the contaminated area, to establish the Guadiamar Green Corridor.



Research projects

2009-2012 Ecological interactions and global change in Mediterranean forests (INTERBOS). Spanish Ministry of Science and Innovation. Coordinated by Teodoro Marañón

Subproyect 1: Tree-soil interactions and functioning of Mediterranean forests: a spatially-explicit approach using neighborhood models.  Directed by Teodoro Marañón


2006-2009 Dynamics of Mediterranean forests under a global change scenario (DINAMED). Spanish Ministry of Science and Technology. Coordinated by Teodoro Marañón



2009-2012 Decline of the Doñana heronry-cork oak woodland within a context of global change (DECALDO). Spanish Ministry of Environment. Directed by Luis V. García


2008-2009 Assessment of the effects of avian depositions on soil characteristics and Quercus suber performance in the waterbird colonies of the Doñana National Park. Andalusia Government (EGMASA). Directed by Luis V. García


2007-2010 Sustainable management of Mediterranean forests under a global change scenario: research and application (GESBOME). Excellence Research Programme of the Andalusian Government. Coordinated by Regino Zamora


2007-2010 Viability and ecological conectivity of a new afforestation model: application to the Guadiamar Green Corridor (P06-RNM-0193). Excellence Research Programme of the Andalusian Government. Directed by Alejandro Rodríguez Blanco


2002-2005 The role of heterogeneity influencing forest regeneration and restoration in Mediterranean environments (HETEROMED). Spanish Ministry of Science and Technology. Coordinated by Teodoro Marañón


1999-2001 Evaluation and monitoring of regeneration of Mediterranean forests: effects of shrub-clearing and thinning.Subproject 3. FEDER-CICYT (1FD97-743-C03-03). Directed by Teodoro Marañón.

1999-2002 Regeneration of the Mediterranean forest: growth rates of woody species. Spanish Ministry of Science. Directed by Rafael Villar.

1998-2001 Biodiversity of Mediterranean forests: comparison between south Spain and north Morocco. Spanish Ministry of Science (PB97-1177),. Directed by Teodoro Marañón





Aponte C, Garcia LV, Marañón T & Gardes M. 2010. Indirect host effect on ectomycorrhizal fungi: Leaf fall and litter quality explain changes in fungal communities on the roots of co-occurring Mediterranean oaks. Soil Biology & Biochemistry 42: 788-796

Aponte C, Marañón T, García LV. 2010. Microbial C, N and P in soils of Mediterranean oak forests: influence of season canopy cover and soil depth. Biogeochemistry (in press) DOI: 10.1007/s10533-010-9418-5.

Domínguez MT, Madejón P, Marañón T & Murillo JM. 2010. Afforestation of a trace-element polluted area in SW Spain: woody plant performance and trace element accumulation. European Journal of Forest Research 129: 47-59.

Domínguez MT, Marañón T, Murillo JM, Schulin R & Robinson BH. 2010. Nutritional status of mediterranean trees growing in a contaminated and remediated area. Water, Air and Soil Pollution 205: 305-321.

Pérez-Ramos IM, Gómez-Aparicio L, Villar R, García LV & Marañón T. 2010. Seedling growth and morphology of three oak species along field resource gradients and seed mass variation: a seedling age-dependent response. Journal of Vegetation Science 21: 419-437

Domínguez MT, Madrid F, Marañón T & Murillo JM. 2009. Cadmium availability in soil and retention in oak roots: Potential for phytostabilization. Chemosphere, 76(4), 480-86.

Marañón T, Pugnaire FI & Callaway RM. 2009. Mediterranean-climate oak savannas: the interplay between abiotic environment and species interactions. Web Ecology, 9: 30-43.

Pérez-Ramos IM & Marañón T. 2009. Effects of waterlogging on seed germination of three Mediterranean oak species: Ecological implications. Acta Oecologica-International Journal of Ecology, 35(3), 422-28.

Domínguez MT, Marañón T, Murillo JM, Schulin R & Robinson BH. 2008. Trace element accumulation in woody plants of the Guadiamar Valley, SW Spain: A large-scale phytomanagement case study. Environmental Pollution, 152(1), 50-59.

Gómez-Aparicio L, Pérez-Ramos IM, Mendoza I, Matías L, Quero JL, Castro J, Zamora R & Marañón T. 2008. Oak seedling survival and growth along resource gradients in Mediterranean forests: implications for regeneration in current and future environmental scenarios. Oikos, 117(11), 1683-99.

Pérez-Ramos IM & Marañón T. 2008. Factors affecting post-dispersal seed predation in two coexisting oak species: Microhabitat, burial and exclusion of large herbivores. Forest Ecology and Management, 255(8-9), 3506-14.

Pérez-Ramos IM, Urbieta IR, Marañón T, Zavala MA & Kobe RK. 2008. Seed removal in two coexisting oak species: ecological consequences of seed size, plant cover and seed-drop timing. Oikos, 117(9), 1386-96.

Pérez-Ramos IM, Zavala MA, Marañón T, Díaz-Villa MD & Valladares F. 2008. Dynamics of understorey herbaceous plant diversity following shrub clearing of cork oak forests: A five-year study. Forest Ecology and Management, 255(8-9), 3242-53.

Quero JL, Villar R, Marañón T, Murillo A & Zamora R. 2008. Plastic response to light and water in four Mediterranean Quercus species (Fagaceae). Revista Chilena de Historia Natural, 81(3), 373-85.

Quero JL, Villar R, Marañón T, Zamora R, Vega D & Sack L. 2008. Relating leaf photosynthetic rate to whole-plant growth: drought and shade effects on seedlings of four Quercus species. Functional Plant Biology, 35(8), 725-37.

Quilchano C, Marañón T, Pérez-Ramos IM, Noejovich L, Valladares F & Zavala MA. 2008. Patterns and ecological consequences of abiotic heterogeneity in managed cork oak forests of Southern Spain. Ecological Research, 23(1), 127-39.

Urbieta IR, Pérez-Ramos IM, Zavala MA, Marañón T & Kobe RK. 2008. Soil water content and emergence time control seedling establishment in three co-occurring Mediterranean oak species. Canadian Journal of Forest Research-Revue Canadienne de Recherche Forestiere, 38(9), 2382-93.

Urbieta IR, Zavala MA & Marañón T. 2008. Human and non-human determinants of forest composition in southern Spain: evidence of shifts towards cork oak dominance as a result of management over the past century. Journal of Biogeography, 35(9), 1688-700.

Madejón P, Murillo JM, Marañón T & Lepp NW. 2007. Factors affecting accumulation of thallium and other trace elements in two wild Brassicaceae spontaneously growing on soils contaminated by tailings dam waste. Chemosphere, 67(1), 20-28.

Maltez-Mouro S, García LV, Marañón T & Freitas H. 2007. Recruitment patterns in a Mediterranean oak forest: A case study showing the importance of the spatial component. Forest Science, 53, 645-52.

Mejías JA, Arroyo J & Marañón T. 2007. Ecology and biogeography of plant communities associated with the post Plio-Pleistocene relict Rhododendron ponticum subsp baeticum in southern Spain. Journal of Biogeography, 34(3), 456-72.

Pérez-Ramos IM, Marañón T, Lobo JM & Verdú JR. 2007. Acorn removal and dispersal by the dung beetle Thorectes lusitanicus: ecological implications. Ecological Entomology, 32(4), 349-56.

Quero JL, Villar R, Marañón T, Zamora R & Poorter L. 2007. Seed-mass effects in four Mediterranean Quercus species (Fagaceae) growing in contrasting light environments. American Journal of Botany, 94, 1795-803.

Verdú JR, Lobo JM, Numa C, Pérez-Ramos IM, Galante E & Marañón T. 2007. Acorn preference by the dung beetle, Thorectes lusitanicus, under laboratory and field conditions. Animal Behaviour, 74, 1697-704.

Ajbilou R, Marañón T & Arroyo J. 2006. Ecological and biogeographical analyses of Mediterranean forests of northern Morocco. Acta Oecologica-International Journal of Ecology, 29(1), 104-13.

Madejón P, Marañón T & Murillo JM. 2006. Biomonitoring of trace elements in the leaves and fruits of wild olive and holm oak trees. Science of the Total Environment, 355(1-3), 187-203.

Madejón P, Marañón T, Murillo JM & Robinson B. 2006. In defence of plants as biomonitors of soil quality. Environmental Pollution, 143(1), 1-3.

Madejón P, Murillo J, Marañón T & Cabrera F. 2006. Bioaccumulation of trace elements in a wild grass three years after the Aznalcóllar mine spill (south Spain). Environmental Monitoring and Assessment, 114(1-3), 169-89.

Madejón P, Murillo JM, Marañón T, Espinar JL & Cabrera F. 2006. Accumulation of As, Cd and selected trace elements in tubers of Scirpus maritimus L. from Doñana marshes (South Spain). Chemosphere, 64(5), 742-48.

Quero JL, Villar R, Marañón T & Zamora R. 2006. Interactions of drought and shade effects on seedlings of four Quercus species: physiological and structural leaf responses. New Phytologist, 170(4), 819-33.

Madejón P, Murillo JM, Marañón T, Valdés B & Oliva SR. 2005. Thallium accumulation in floral structures of Hirschfeldia incana (L.) Lagreze-Fossat (Brassicaceae). Bulletin of Environmental Contamination and Toxicology, 74(6), 1058-64.

Maltez-Mouro S, García LV, Marañón T & Freitas H. 2005. The combined role of topography and overstorey tree composition in promoting edaphic and floristic variation in a Mediterranean forest. Ecological Research, 20(6), 668-77.

Villar R, Marañón T, Quero JL, Panadero P, Arenas F & Lambers H. 2005. Variation in relative growth rate of 20 Aegilops species (Poaceae) in the field: The importance of net assimilation rate or specific leaf area depends on the time scale. Plant and Soil, 272(1-2), 11-27.

Madejón P, Marañón T, Murillo JM & Robinson B. 2004. White poplar (Populus alba) as a biomonitor of trace elements in contaminated riparian forests. Environmental Pollution, 132(1), 145-55.

Marañón T, Zamora R, Villar R, Zavala MA, Quero JL, Pérez-Ramos IM, Mendoza I & Castro J. 2004. Regeneration of tree species and restoration under contrasted Mediterranean habitats: field and glasshouse experiments. International journal of Ecology and Environmental Sciences 30: 187-196.

Díaz-Villa MD, Marañón T, Arroyo J & Garrido B. 2003. Soil seed bank and floristic diversity in a forest-grassland mosaic in southern Spain. Journal of Vegetation Science, 14(5), 701-09.

Garrido B, Hampe A, Marañón T & Arroyo J. 2003. Regional differences in land use affect population performance of the threatened insectivorous plant Drosophyllum lusitanicum (Droseraceae). Diversity and Distributions, 9(5), 335-50.

Madejón P, Murillo JM, Marañón T, Cabrera F & Soriano MA. 2003. Trace element and nutrient accumulation in sunflower plants two years after the Aznalcóllar mine spill. Science of the Total Environment, 307(1-3), 239-57.

Robinson B, Fernández JE, Madejón P, Marañón T, Murillo JM, Green S & Clothier B. 2003. Phytoextraction: an assessment of biogeochemical and economic viability. Plant and Soil, 249(1), 117-25.

Sack L, Grubb PJ & Marañón T. 2003. The functional morphology of juvenile plants tolerant of strong summer drought in shaded forest understories in southern Spain. Plant Ecology, 168(1), 139-63.

García LV, Marañón T, Ojeda F, Clemente L & Redondo R. 2002. Seagull influence on soil properties, chenopod shrub distribution, and leaf nutrient status in semi-arid Mediterranean islands. Oikos, 98(1), 75-86.

Madejón P, Murillo JM, Marañón T, Cabrera F & López R. 2002. Bioaccumulation of As, Cd, Cu, Fe and Pb in wild grasses affected by the Aznalcóllar mine spill (SW Spain). Science of the Total Environment, 290(1-3), 105-20.

Quilchano C & Marañón T. 2002. Dehydrogenase activity in Mediterranean forest soils. Biology and Fertility of Soils, 35(2), 102-07.

Sack L, Marañón T & Grubb PJ. 2002. Global allocation rules for patterns of biomass partitioning. Science, 296(5575), 1923.

Ojeda F, Simmons MT, Arroyo J, Marañón T & Cowling RM. 2001. Biodiversity in South African fynbos and Mediterranean heathland. Journal of Vegetation Science, 12(6), 867-74.

Ojeda F, Arroyo J & Marañón T. 2000. Ecological distribution of four co-occurring Mediterranean heath species. Ecography, 23(1), 148-59.

Ojeda F, Marañón T & Arroyo J. 2000. Plant diversity patterns in the Aljibe Mountains (S Spain): a comprehensive account. Biodiversity and Conservation, 9(9), 1323-43.

Marañón T, Ajbilou R, Ojeda F & Arroyo J. 1999. Biodiversity of woody species in oak woodlands of southern Spain and northern Morocco. Forest Ecology and Management, 115(2-3), 147-56.

Murillo JM, Marañón T, Cabrera F & Lopez R. 1999. Accumulation of heavy metals in sunflower and sorghum plants affected by the Guadiamar spill. Science of the Total Environment, 242(1-3), 281-92.

Marañón T. 1998. Soil seed bank and community dynamics in an annual-dominated Mediterranean salt-marsh. Journal of Vegetation Science, 9(3), 371-78.

Ojeda F, Arroyo J & Marañón T. 1998. The phytogeography of European and Mediterranean heath species (Ericoideae, Ericaceae): a quantitative analysis. Journal of Biogeography, 25(1), 165-78.

Marañón T & García LV. 1997. The relationship between diversity and productivity in plant communities: Facts and artefacts. Journal of Ecology, 85(1), 95-96.

Ojeda F, Marañón T & Arroyo J. 1996. Patterns of ecological, chorological and taxonomic diversity at both sides of the Strait of Gibraltar. Journal of Vegetation Science, 7(1), 63-72.

Ojeda F, Marañón T & Arroyo J. 1996. Postfire regeneration of a Mediterranean heathland in southern Spain. International Journal of Wildland Fire, 6(4), 191-98.

Romero JM & Marañón T. 1996. Allocation of biomass and mineral elements in Melilotus segetalis (annual sweetclover): Effects of NaCl salinity and plant age. New Phytologist, 132(4), 565-73.

Ojeda F, Arroyo J & Marañón T. 1995. Biodiversity components and conservation of Mediterranean heathlands in Southern Spain. Biological Conservation, 72(1), 61-72.

Romero JM & Marañón T. 1994. Long-term responses of Melilotus segetalis to salinity .1. Growth and partitioning. Plant Cell and Environment, 17(11), 1243-48.

Romero JM, Marañón T & Murillo JM. 1994. Long-term responses of Melilotus segetalis to salinity .2. Nutrient absorption and utilization. Plant Cell and Environment, 17(11), 1249-55.

García LV, Marañón T, Moreno A & Clemente L. 1993. Aboveground biomass and species richness in a Mediterranean salt-marsh. Journal of Vegetation Science, 4(3), 417-24.

Marañón T & Bartolome JW. 1993. Reciprocal transplants of herbaceous communities between Quercus agrifolia woodland and adjacent grassland. Journal of Ecology, 81(4), 673-82.

Marañón T & Grubb PJ. 1993. Physiological basis and ecological significance of the seed size and relative growth rate relationship in Mediterranean annuals. Functional Ecology, 7(5), 591-99.

Soldevilla M, Marañón T & Cabrera F. 1992. Heavy-metal content on soil and plants from a pyrite mining area in Southwest Spain. Communications in Soil Science and Plant Analysis, 23(11-12), 1301-1319.

Arroyo J & Marañón T. 1990. Community ecology and distributional spectra of Mediterranean shrublands and heathlands in Southern Spain. Journal of Biogeography, 17(2), 163-76.

Marañón T. 1989. Variations in seed size and germination in three Aegilops Species. Seed Science and Technology, 17(3), 583-88.

Marañón T & Bartolome JW. 1989. Seed and seedling populations in two contrasted communities - open grassland and oak (Quercus agrifolia) understory in California. Acta Oecologica-Oecologia Plantarum, 10(2), 147-58.

Marañón T, García LV & Troncoso A. 1989. Salinity and germination of annual Melilotus from the Guadalquivir Delta (SW Spain). Plant and Soil, 119(2), 223-28.







Research group in Ecology, Evolution and Conservation of Mediterranean Plants




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