Variability in Fruit and Seed Morphology Among and Within Populations of Plathymenia (Leguminosae - Mimosoideae) in Areas of the Cerrado, the Atlantic Forest, and Transitional Sites

Abstract

Plathymenia reticulata is a tree species that occurs in two different Brazilian biomes, the Cerrado (a savannah environment), and the Atlantic Forest. In the present study, we evaluated morphological variation within and among five populations located in these vegetation types and in transitional sites in order to test the hypothesis that habitat selective pressures, being different in the Cerrado and the Atlantic Forest, would cause adaptive differences in morphological traits in individuals occurring under these different circumstances. Thirteen morphological traits of fruits, seeds, and of the membranous endocarp were obtained from 30 fruits and 20 seeds from each of nine to 10 individuals per population. Significant variation was found for all traits while comparing individuals within populations, and most traits varied significantly among populations as well. Some traits differed significantly between forest and Cerrado populations, while transition sites showed intermediate patterns and higher within-population variation. Contrary to our hypothesis, variation in seed size and mass among populations from different habitats was not significant. However, as predicted, the membranous endocarp was shorter for the seeds from Cerrado populations than from the Atlantic Forest. These data suggest the existence of P. reticulata ecotypes from Cerrado and Atlantic Forest; the relevance to Plathymenia evolution and to its wide ecological distribution is discussed.

Atlantic Forest - Cerrado - ecotypes - membranous endocarp - Plathymenia foliolosa - Plathymenia reticulata - seed dispersal.

References

• 1 Bañuelos M. J., Obeso J. R.. Maternal provisioning, sibling rivalry and seed mass variability in the dioecious shrub Rhammus alpinus.  Evolutionary Ecology. (2003);  17 19-31
• 2 de Paula S. A., Lemos Filho J. P.. Dinâmica do dossel em mata semidecídua do perímetro urbano de Belo Horizonte, MG.  Revista Brasileira de Botânica. (2001);  24 545-551
• 3 Donohue K.. Maternal determinants of seed dispersal in Cakile edentula: fruit, plant and site traits.  Ecology. (1998);  79 2771-2778
• 4 Fonseca G. A. B., Mittermeier R. A., Cavalcanti R. B., Mittermeier C. G.. Brazilian Cerrado. Mittermeier, R. A., Myers, N., Gil, P. R., and Mittermeier, C. G., eds. Hot Spots: Earth's Biologically Richest and Most Endangered Terrestrial Ecoregions. Mexico City; CENEX (1999): 148-155
• 5 Geritz S. A. H., van der Meijden E., Metz J. A. J.. Evolutionary dynamics of seed size and seedling competitive ability.  Theoretical Population Biology. (1999);  55 324-343
• 6 González-Astorga J., Vovides A. P., Iglesias C.. Morphological and geographic variation of the cycad Dioon edule Lindl. (Zamiaceae): ecological and evolutionary implications.  Botanical Journal of the Linnean Society. (2003);  141 465-470
• 7 Goulart M. G., Lemos Filho J. P., Lovato M. B.. Phenological variation within and among populations of Plathymenia reticulata in Brazilian Cerrado, the Atlantic Forest and transitional sites.  Annals of Botany. (2005);  96 445-455
• 8 Heringer E. P.. O gênero Plathymenia. .  Anais da Sociedade Botânica do Brasil. (1956);  7 55-64
• 9 Heringer E. P., Ferreira M. B.. Árvores úteis no Cerrado (I): Vinhático: o gênero Plathymenia Benth. P. foliolosa Benth. e P. reticulata Benth., vinhático da mata e vinhático do campo (par vicariante).  Cerrado. (1972);  5 28-34
• 10 Jacquemyn H., Brys R., Hermy M.. Within and between plant variation in seed number, seed mass and germinability of Primula elatior: effect of population size.  Plant Biology. (2001);  3 561-568
• 11 Jakobsson A., Eriksson O.. A comparative study of seed number, seed size, seedling size and recruitment in grassland plants.  Oikos. (2000);  88 494-502
• 12 Lacerda D. R., Acedo M. D. P., Lemos Filho J. P., Lovato M. B.. Genetic diversity and structure of natural populations of Plathymenia reticulata (Mimosoideae), a tropical tree from the Brazilian Cerrado.  Molecular Ecology. (2001);  10 1143-1152
• 13 Lacerda D. R., Acedo M. D. P., Lemos Filho J. P., Lovato M. B.. Molecular differentiation of two vicariant neotropical tree species, Plathymenia foliolosa and P. reticulata (Mimosoideae), inferred using RAPD markers.  Plant Systematic and Evolution. (2002);  235 67-77
• 14 Lacerda D. R., Lemos Filho J. P., Goulart M. F., Ribeiro R. A., Lovato M. B.. Seed dormancy variation in natural populations of two tropical leguminous tree species: Senna multijuga (Caesalpinoideae) and Plathymenia reticulata (Mimosoideae).  Seed Science Research. (2004);  14 127-135
• 15 Lewis G. P.. Legumes of Bahia. Kew; Royal Botanic Gardens (1987)
• 16 Lorenzi H.. Árvores Brasileiras: Manual de Identificação e Cultivo de Plantas Arbóreas Nativas do Brasil. Nova Odessa; Instituto Plantarum de Estudos da Flora Ltda (1992)
• 17 Lortie C. J., Aarsen L. W.. The specialization hypothesis for phenotypic plasticity in plants.  International Journal of Plant Sciences. (1996);  157 484-487
• 18 Marinis G.. Contribuição ao conhecimento das espécies vicariantes do gênero Plathymenia.  Anais da Academia Brasileira de Ciências. (1966);  38 71-83
• 19 Matos Filho A.. Contribuição ao estudo anatômico do lenho do gênero Plathymenia. .  Rofriguesia. (1959);  21 45-58
• 20 Mendes I. C., Paviani T. I.. Morfo-anatomia comparada das folhas do par vicariante Plathymenia foliolosa Benth. e Plathymenia reticulata Benth. (Leguminosae - Mimosoideae).  Revista Brasileira de Botânica. (1997);  20 185-195
• 21 Minami S., Azuma A.. Various flying modes of wind-dispersal seeds.  Journal of Theoretical Biology. (2003);  225 1-14
• 22 Miranda A. C., Miranda H. S., Lloyd J., Grace J., Francey R. J., McIntyre J. A., Meir P., Riggan P., Lockwood R., Brass J.. Fluxes of carbon, water and energy over Brazilian cerrado: an analysis using eddy covariance and stable isotopes.  Plant, Cell and Environment. (1997);  20 315-328
• 23 Mittermeier R. A., Fonseca G. A. B., Rylands A. B., Mittermeier C. G.. Atlantic Forest. Mittermeier, R. A., Myers, N., Gil, P. R., and Mittermeier, C. G., eds. Hot Spots: Earth's Biologically Richest and Most Endangered Terrestrial Ecoregions. Mexico City; CENEX (1999): 137-147
• 24 Moles A., Falser D. S., Leishman M. R., Westoby M.. Small-seeded species produce more seeds per square metre of canopy per year, but not per individual per lifetime.  Journal of Ecology. (2004);  92 384-396
• 25 Murray B. R., Brown A. H. D., Grace J. P.. Geographic gradients in seed size among and within perennial Australian Glycine species.  Australian Journal of Botany. (2003);  51 47-56
• 26 Murray B. R., Brown A. H. D., Dickman C. R., Crowther M. S.. Geographical gradients in seed mass in relation to climate.  Journal of Biogeography. (2004);  31 379-388
• 27 Murray B. R., Gill A. M.. A comparative study of interspecific variaiton in fruit size among Australian eucalypts.  Ecography. (2001);  24 651-658
• 28 Myers N., Mittermeier R. A., Mittermeier C. G., Fonseca G. A. B., Kent J.. Biodiversity hotspots for conservation priorities.  Nature. (2000);  403 853-858
• 29 Peroni P. A.. Seed size and dispersal potential of Acer rubrum (Aceraceae) samaras produced by populations in early and late successional environments.  American Journal of Botany. (1994);  81 1428-1434
• 30 Rees M.. Evolutionay ecology of seed dormancy and seed size.  Philosophical Transactions of the Royal Society B: Biological Sciences. (1996);  351 1299-1308
• 31 Saverimuttu T., Westoby M.. Seedling longevity under deep shade in relation to seed size.  Journal of Ecology. (1996);  84 681-689
• 32 Silvera K., Skillman J. B., Dalling J. W.. Seed germination, seedling growth and habitat partitioning in two morphotypes of the tropical pioneer tree Trema micrantha in a seasonal forest in Panama.  Journal of Tropical Ecology. (2003);  19 27-34
• 33 Telenius A.. Seed heteromorphism in a population of Spergularia media in relation to the ambient vegetation density.  Acta Botanica Neerlandica. (1992);  41 305-318
• 34 Telenius A., Torstensson P.. Seed type and seed size variation in the heteromorphic saltmarsh annual Spergularia salina along the coast of Sweden.  Plant Biology. (1999);  1 585-593
• 35 Thiede D. A., Augspurger C. K.. Intraspecific variation in seed dispersion of Lepidium campestre (Brassicaceae).  American Journal of Botany. (1996);  83 856-866
• 36 Trueman S. J., Wallace H. M.. Pollination and resourse constraints on fruit set and fruit size of Persoonia rigida (Proteaceae).  Annals of Botany. (1999);  83 145-155
• 37 Valladares F., Wright S. J., Lasso E., Kitajima K., Pearcy R. W.. Plastic phenotypic response to light of 16 congeneric shrubs from a Panamanian rainforest.  Ecology. (2000);  81 1925-1936
• 38 Valladares F., Skillman J. B., Pearcy R. W.. Convergence in light capture efficiencies among tropical forest understory plants with contrasting crown architectures: a case of morphological compensation.  American Journal of Botany. (2002);  89 1275-1284
• 39 Venable D. L., Dyreson E., Piñero D., Becerra J. X.. Seed morphometrics and adaptative geographic differentiation.  Evolution. (1998);  52 344-354
• 40 Warwick M. C., Lewis G. P.. Revision of Plathymenia (Leguminosae - Mimosoideae).  Edinburgh Journal of Botany. (2003);  60 111-119
• 41 Wolfe L. M., Denton W.. Morphological constraints on fruit size in Linaria canadensis.  International Journal of Plant Science. (2001);  162 1313-1316
• 42 Yamada Y., Suzuki E.. Comparative morphology and allometry of winged diaspores among the Asian Sterculiaceae.  Journal of Tropical Ecology. (1999);  15 619-635

Editor: H. de Kroon