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The biosystematics and evolution of the Polyalthia hypoleuca species complex (Annonaceae) of Malesia. II. Comparative distributional ecology

Published online by Cambridge University Press:  10 July 2009

Steven H. Rogstad
Steven H. Rogstad
Affiliation:
Department of Organismal and Evalutionary Biology, Harvard University, Cambridge, Massachusetts, USA,
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Abstract

One component of the high organismal diversity of tropical lowland rain forests is the existence of series of closely related, sympatric species. For example, the six distinct tree species of the monophyletic Polyalthia hypoleuca complex regularly grow sympatrically in various combinations throughout the rain forests of Malesia. Theoretical and empirical evidence has been presented indicating that the members of such series either (1) are well differentiated with respect to at least one major niche component; or (2) may lack differentiated niches. In this study, certain sympatric members of the complex are shown to have clearly diverged in autecological characteristics that affect their distribution including: (1) P. glauca, P. hypoleuca, and P. sumatrana differ in growth characteristics, height at maturity, seedling germination requirements, and are found on soils with differing degrees of hydration; (2) P. discolor grows to a different height and on different substrate types than does P. multinervis; and (3) P. glauca and P. hypoleuca seedlings differ in transpiration characteristics and response to flooding and drought.

Keywords

Annonaceaecompetitive exclusiongermination ecologyMalesiamonophyletic groupsPolyalthiaspecies packingtropical rain forest ecologywater relations
Type
Research Article
Information
Journal of Tropical Ecology , Volume 6 , Issue 4 , November 1990 , pp. 387 - 408
Copyright
Copyright © Cambridge University Press 1990

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