Ecology of Tropical Savannas by Brian J. Huntley, Brian H. Walker (auth.), Brian J. Huntley,

By Brian J. Huntley, Brian H. Walker (auth.), Brian J. Huntley, Brian H. Walker (eds.)

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In general, both areas share a large number of speci es, many of whi ch show a di sj unct di stri buti on, occurri ng in both caatinga and chaco but not found in the more mesic cerrados. This biogeographic affinity becomes apparent when comparing anurans (Lutz 1967), lizards (Vanzolini 1974) and birds (Short 1975). •• which is much nearer the Chaco". At the same time, both chaco and caatinga show a very low number of endemics, as has been found in ants (Kusnezov 1963), in anurans (Vellard 1948), in lizards (Vanzolini 1974) and in birds (Short 1975).

A critical consideration of the envi ronmenta 1 condi ti ons associ a ted wi th the occurrence of savanna ecosystems in tropical America. In: Golley F Band E Medina (eds) Tropical ecological systems. Springer, Berlin, pp 223-250. Soares L de C 1953. Limites meridionais e orientais da area de ocorrencia da floresta amazonica em territorio brasileiro. Revista Brasileira de Geografia 12, 3-122. Takeuchi M 1960a. The structure of the Amazonian vegetation. I. Savanna in northern Amazon. Journal of the Faculty of Science, University of Tokyo, Sect 3, Bot~, 523-533.

44 The Martins Pinheiro campo was several dozen km2 in extent, on deep pure white sand and had an open woodland physiognomy with trees about 10 m tall with about 30% cover. There were also shrubs of all sizes but the trees were visually dominant. There were only about half a dozen species of trees in the entire woodland and the shrub and herb flora was also poor. In the Marajo campo firme, the soil is a light, almost pure sand, the trees vary in density from none to about 50% crown cover, and there are few shrubs.

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