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RESEARCH ARTICLE
Contents Vol 29(2)

Floristic and structural contrasts between natural savannas and anthropogenic pastures in a tropical dry landscape

L. I. López-Olmedo A , J. A. Meave A B and E. A. Pérez-García A
+ Author Affiliations
- Author Affiliations

A Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, México 04510, D.F., Mexico.

B Corresponding author. Email: jamdc@fciencias.unam.mx

The Rangeland Journal 29(2) 181-190 https://doi.org/10.1071/RJ07007
Submitted: 14 February 2007  Accepted: 20 September 2007   Published: 14 November 2007

Abstract

The magnitude of the biological differentiation between natural savannas and pastures (anthropogenic grasslands) coexisting in a single landscape, in terms of their floristic composition and community structure, was studied in the Nizanda region, Isthmus of Tehuantepec, Oaxaca State, southern Mexico. Vegetation samples of 15 m2 each were taken at 20 savanna and 11 pasture sites. Cover- and species richness-based diversity and dominance indices were calculated. Geomorphological and edaphic characteristics were also compared. Savannas generally occurred in hill summits with very shallow and stony, discontinuous and acidic soils; contrastingly, pastures were located in piedmonts and floodplains, with more neutral and less stony soils. Savanna sites differed from pasture sites in species richness and Shannon diversity. They did not differ in Simpson dominance index, but the identity of the dominant species was different in each community: Trachypogon spicatus (L.f.) Kuntze in savanna and Megathyrsus maximus (Jacq.) B.K.Simon et S.W.L.Jacobs in pasture. A low species-level similarity (Sørensen Index) was observed between them (8.2%), and genus-level similarity was only slightly higher (27.1%). The magnitude of the biological differentiation in both community floristics and structure between these two grass-dominated communities was larger than anticipated. Current management of savannas as pasture lands may potentially trigger a severe deterioration process involving both the landscape and its plant components.

Additional keywords: cattle ranching, grasslands, Megathyrsus maximus, Trachypogon spicatus, vegetation structure.


Acknowledgements

We are indebted to the people of Nizanda, particularly to the Reyes–Manuel family for their hospitality and support. A. Chain, I. López, M. A. Romero, J. A. Sierra, and H. Tovar assisted during fieldwork. O. Huber and two anonymous reviewers provided valuable comments to a previous version of this paper. This study was funded by CONABIO (L085) and CONACYT-SEMARNAT (2002-C01-0267). L.I.L-O. was supported by a graduate scholarship (No. 169865) from CONACyT.


References


Anon. (1981). ‘Atlas nacional del medio físico.’ (Secretaría de Programación y Presupuesto: México, DF, Mexico.)

Anon. (1985 a). ‘Juchitán E15–10 D15–1. Carta de efectos climáticos regionales mayo–octubre 1 : 250000.’ (Secretaría de Programación y Presupuesto: México, DF, Mexico.)

Anon. (1985 b). ‘Juchitán E15–10 D15–1. Carta de efectos climáticos regionales noviembre–abril 1:250000.’ (Secretaría de Programación y Presupuesto: México, DF, Mexico.)

Balick M., Nee M. H., Atha D. E. (2000) Checklist of the vascular plants of Belize, with common names and uses. Memoirs of the New York Botanical Garden 85, 1–246. open url image1

Baruch Z. (1996). Ecophysiological aspects in the invasion by African grasses and their impact on biodiversity and function of Neotropical savannas. In: ‘Biodiversity and savanna ecosystem processes. A global perspective’. (Eds O. T. Solbrig, E. Medina and J. F. Silva.) pp. 61–71. (Springer-Verlag: San Diego.)

Beard J. S. (1953) The savanna vegetation of northern tropical America. Ecological Monographs 23, 149–215.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Blydenstein J. (1967) Tropical savanna vegetation of the Llanos of Colombia. Ecology 48, 1–15.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Bogdan A. V. (1977). ‘Tropical pasture and fodder plants.’ (Longman: New York.)

Bourlière F., Hadley M. (1970) The ecology of tropical savannas. Annual Review of Ecology and Systematics 1, 125–152.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Challenger A. (1998). ‘Utilización y conservación de los ecosistemas terrestres de México: Pasado, presente y futuro.’ (Universidad Nacional Autónoma de México: México, DF, Mexico.)

Chelton D. B., Freilich M. H., Esbensen S. K. (2000) Satellite observations of the wind jets off the Pacific Coast of Central America. Part I. Case studies and statistical characteristics. Monthly Weather Review 128, 1993–2018.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Clewell A. F. (1973) Floristic composition of a stand of Pinus oocarpa in Honduras. Biotropica 5, 175–182.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Colín-García M. (2003). Evaluación de los cambios de la cobertura vegetal y del riesgo de las especies de plantas en la región de Nizanda (Oaxaca, México). M.Sc. thesis, Universidad Nacional Autónoma de México, DF, Mexico.

Colwell R. K. (2005). EstimateS, statistical estimation of species richness and shared species from samples. Version 7.5. (University of Connecticut: Storrs, CT.) Available at: http://viceroy.eeb.uconn.edu/EstimateS http://viceroy.eeb.uconn.edu/EstimateS(accessed 15 November 2005)

Cortés-González J. J. (2007). Variabilidad intracultural y pérdida del conocimiento sobre el entorno natural en una comunidad zapoteca del sur de México (Nizanda, Oaxaca). M.Sc. thesis, Universidad Nacional Autónoma de México, DF, Mexico.

Eiten G. (1972) The cerrado vegetation of Brazil. Botanical Review 38, 201–341. open url image1

Eiten G. (1986) Use of term “savanna”. Tropical Ecology 27, 10–22. open url image1

Espinosa-García F. J. , and Sarukhán J. (1997). ‘Manual de malezas del Valle de México.’ (Universidad Nacional Autónoma de México y Fondo de Cultura Económica: México, DF, Mexico.)

Filgueiras T. S. (2002). Herbaceous plant communities. In: ‘The Cerrados of Brazil: ecology and natural history of a neotropical savanna’. (Eds P. S. Oliveira and R. M. Marquis.) pp. 121–139. (Columbia University Press: New York.)

Flenley J. (1979). ‘The equatorial rain forest: a geological history.’ (Butterworths: London.)

Furley P. A. (1999) The nature and diversity of Neotropical savanna vegetation with particular reference to the Brazilian cerrados. Global Ecology and Biogeography 8, 223–241. open url image1

García E. (2004). ‘Modificaciones al sistema de clasificación climática de Köppen.’ 5th edn. (Universidad Nacional Autónoma de México: México, DF, Mexico.)

García-Mendoza A. , and Torres-Colín R. (1999). Estado actual del conocimiento sobre la flora de Oaxaca, México. In: ‘Sociedad y naturaleza en Oaxaca 3’. (Ed. M. A. Vázquez-Dávila.) pp. 50–86. (Instituto Tecnológico Agropecuario de Oaxaca: Oaxaca, Oax., Mexico.)

Gómez-Pompa A. (1965) La vegetación de México. Boletín de la Sociedad Botánica de México 29, 76–120. open url image1

Gómez-Pompa A. (1973). Ecology of the vegetation of Veracruz. In: ‘Vegetation and vegetational history of northern Latin America’. (Ed. A. Graham.) pp. 73–148. (Elsevier Scientific Publishing Company: New York.)

Guevara S., Meave J., Moreno-Casasola P., Laborde J., Castillo S. (1994) Vegetación y flora de potreros en la sierra de Los Tuxtlas. Acta Botanica Mexicana 28, 1–27. open url image1

Guevara S. , Laborde J. , Liesenfeld D. , and Barrera O. (1997). Potreros y ganadería. In: ‘Historia natural de Los Tuxtlas’. (Eds E. González-Soriano, R. Dirzo and R. C. Vogt.) pp. 43–58. (Universidad Nacional Autónoma de México: México, DF, Mexico.)

Huber O. (1987) Neotropical savannas: their flora and vegetation. Trends in Ecology & Evolution 2, 67–71.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Kellman M. (1984) Synergistic relationships between fire and low soil fertility in neotropical savannas: a hypothesis. Biotropica 16, 158–160.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Kellman M. (1989). Mineral nutrient dynamics during savanna-forest transformation in Central America. In: ‘Mineral nutrients in tropical forest and savanna ecosystems’. (Ed. J. Proctor.) pp. 137–151. (Blackwell: Oxford.)

Kellman M., Miyanishi K. (1982) Forest seedling establishment in Neotropical savannas: observations and experiments in the Mountain Pine Ridge savanna, Belize. Journal of Biogeography 9, 193–206.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Lebrija-Trejos E. (2004). Secondary succession in a tropical dry forest of southern Mexico. M.Sc. thesis, Wageningen University, Wageningen, The Netherlands.

Ledru M. P. (2002). Late quaternary history and evolution of the cerrados as revealed by palynological records. In: ‘The cerrados of Brazil: ecology and natural history of a neotropical savanna’. (Eds P. S. Oliveira and R. M. Marquis.) pp. 33–50. (Columbia University Press: New York.)

López-Olmedo L. I., Pérez-García E. A., Meave J. A. (2006) Estructura y composición florística de las sabanas de la región de Nizanda, Istmo de Tehuantepec (Oaxaca), México. Acta Botanica Mexicana 77, 41–67. open url image1

Lovera M., Cuenca G. (1996) Arbuscular mycorrhizal infection in Cyperaceae and Graminae from natural, disturbed and restored savannas in La Gran Sabana, Venezuela. Mycorrhiza 6, 111–116.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Lundell C. L. (1937). ‘The vegetation of Petén.’ (Carnegie Institute of Washington: Washington, DC.)

Lüttge U. (1997). ‘Physiological ecology of tropical plants.’ (Springer Verlag: Berlin.)

Magurran A. (2004). ‘Measuring biological diversity.’ (Blackwell: Oxford.)

Medina E. , and Silva J. F. (1991). Savannas of northern South America: a steady state regulated by water-fire interactions on a background of a low nutrient availability. In: ‘Savanna ecology and management: Australian perspectives and intercontinental comparisons’. (Ed. A. Werner.) pp. 59–69. (Blackwell: Oxford.)

Miles L., Newton A. C., deFries R. S., Ravilious C., May I., Blyth S., Kapos V., Gordon J. E. (2006) A global overview of the conservation status of tropical dry forests. Journal of Biogeography 33, 491–505.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Miranda F. (1952). ‘La vegetación de Chiapas.’ (Gobierno del Estado de Chiapas: Tuxtla Gutiérrez, Chis., Mexico.)

Mistry J. (2000). ‘World savannas: ecology and human use.’ (Prentice Hall: New York.)

Mostacedo B., Killeen T. (1997) Estructura y composición florística del cerrado en el Parque Nacional Noel Kempff Mercado, Santa Cruz, Bolivia. Boletín de la Sociedad Botánica de México 60, 25–43. open url image1

Oliveira-Filho A. T. , and Ratter J. (2002). Vegetation physiognomies and woody flora of the cerrado biome. In: ‘The cerrados of Brazil: ecology and natural history of a neotropical savanna’. (Eds P. S. Oliveira and R. M. Marquis.) pp. 91–120. (Columbia University Press: New York.)

Pérez-García E. A., Meave J. A. (2006) Coexistence and divergence of tropical dry forests and savannas in southern Mexico. Journal of Biogeography 33, 438–447.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Pérez-García E. A., Meave J., Gallardo C. (2001) Vegetación y flora de la región de Nizanda, Istmo de Tehuantepec, Oaxaca, México. Acta Botanica Mexicana 56, 19–88. open url image1

Pérez-García E. A. , Meave J. A. , and Gallardo-Cruz J. A. (2005). Diversidad β y diferenciación florística en un paisaje complejo del trópico estacionalmente seco del sur de México. In: ‘Sobre diversidad biológica: el significado de las diversidades alfa, beta y gamma’. (Eds G. Halffter, J. Soberón, P. Koleff and A. Melic.) pp. 123–142. (SEA and CONABIO: Zaragoza, Spain.)

Pivello V. R., Carvalho V. M. C., Lopes P. F., Peccinni A. A., Roso S. (1999) Abundance and distribution of native and alien grasses in a “cerrado” (Brazilian savanna) biological reserve. Biotropica 31, 71–82. open url image1

Reina L. (1992). Los albores de la modernidad: El ferrocarril de Tehuantepec. In: ‘Anuario VIII’. (Instituto de Investigaciones Humanísticas, Universidad Veracruzana: Xalapa, Ver., Mexico.)

Reyes R., Zamora C. (1973) Estudio de una sabana de montaña localizada en las estribaciones de la Sierra Madre del Sur. Ciencia Forestal 70, 36–64. open url image1

Ribeiro J. F. , and Walter B. M. T. (1998). Fitofisionomias do bioma cerrado. In: ‘Cerrado: ambiente e flora’. (Eds S. M. Sano and S. P. de Almeida.) pp. 89–166. (Empresa Brasileira de Pesquisa Agropecuária: Planaltina, GO, Brazil.)

Richards P. W. (1996). ‘The tropical rain forest.’ (Cambridge University Press: Cambridge.)

Rzedowski J. (1978). ‘Vegetación de México.’ (Limusa: México, DF, Mexico.)

Salas-Morales S. H., Saynes-Vásquez A., Schibli L. (2003) Flora de la costa de Oaxaca, México: lista florística de la región de Zimatán. Boletín de la Sociedad Botánica de México 72, 21–58. open url image1

Sarmiento G. (1984). ‘The ecology of neotropical savannas.’ (Harvard University Press: Cambridge, MS.)

Sarmiento G. (1990). Ecología comparada de ecosistemas de sabanas neotropicales. In: ‘Las sabanas americanas: aspectos de su biogeografía, ecología y utilización’. (Ed. G. Sarmiento.) pp. 15–56. (Fondo Editorial Acta Científica Venezolana: Caracas, Venezuela.)

Sarmiento G. , and Monasterio M. (1975). A critical consideration of the environmental conditions associated with the occurrence of savanna ecosystems in Tropical America. In: ‘Tropical ecological systems: trends in terrestrial and aquatic research’. (Eds F. B. Golley and E. Medina.) pp. 223–250. (Springer-Verlag: New York.)

Sluyter A. (2001). Ganadería española y cambio ambiental en las tierras bajas tropicales de Veracruz. In: ‘Historia ambiental de la ganadería en México’. (Ed. L. Hernández.) pp. 25–40. (Instituto de Ecología A.C.: Xalapa, Ver., Mexico.)

Torres-Colín R. (2004). Tipos de vegetación. In: ‘Biodiversidad de Oaxaca’. (Eds A. García-Mendoza, M. de J. Ordoñez and M. Briones-Salas.) pp. 105–117. (Universidad Nacional Autónoma de México-Fondo Oaxaqueño para la Conservación de la Naturaleza-World Wildlife Fund: México, DF, Mexico.)

van der Hammen T. (1983). The palaeoecology and palaeogeography of savannas. In: ‘Tropical savannas’. (Ed. F. Bourlière.) pp. 19–35. (Elsevier: Amsterdam.)

van Tongeren O. F. R. (1995). Cluster analysis. In: ‘Data analysis in community and landscape ecology’. (Eds R. H. G. Jongman, C. J. F. ter Braak and O. F. R. van Tongeren.) pp. 174–212. (Cambridge University Press: Cambridge.)

Walter H. (1964). ‘Die Vegetation der Erde. Band I. Die tropischen und subtropischen Zonen.’ (Gustav Fischer: Stuttgart.)

Williams L. (1939) Árboles y arbustos del Istmo de Tehuantepec, México. Lilloa 4, 137–171. open url image1

Zar J. H. (1999). ‘Biostatistical analysis.’ 4th edn. (Prentice Hall: Upper Saddle River, NJ.)