Dispersal Syndromes of fossil Seeds from the Lower Permian of Paraná Basin, Rio Grande do Sul, Brazil

Anais da Academia Brasileira de Ciências

Juliane M. Souza¹  Roberto Iannuzzi¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Geociências Depto de Paleontologia e EstratigrafiaPorto Alegre RS ,Brasil

关键词: Samaropsis;    Cordaicarpus;    dispersal syndromes;    ecological groups;    Lower Permian;    Paraná Basin;    Samaropsis;    Cordaicarpus;    síndromes de dispersão;    grupos ecológicos;    Permiano Inferior;    Bacia do Paraná;   

DOI  :  10.1590/S0001-37652012000100006

来源: SciELO

【 摘 要 】

The morphological analysis of seeds has been an important subject in modern ecological studies, once it provides evidence about the biology and adaptations of the parent plant. However, this kind of study has been restricted to the ecology of modern plants and is rarely used in interpretations of Paleozoic data. From the understanding of dispersal syndromes analysis as an important tool to paleoecological reconstruction, this study provides a first approach using this tool with seeds from the Lower Permian strata of southern Paraná Basin in Rio Grande do Sul. Based on previously classified seeds and using their biological and taphonomic data, the syndrome of dispersal was interpreted, and their placement in successional groups (pioneer, early-successional and later-successional) was suggested. Seven morphospecies were analyzed: Samaropsis gigas, representing a later-successional species living in water bodies with hydrochory as its dispersal syndrome; Samaropsis kurtzii, typical of early-successional species showing anemochory as its dispersal syndrome and living in distal areas in relation to water bodies; Samaropsis aff. S. millaniana, Cordaicarpus aff. C. brasilianus, Cordaicarpus cerronegrensis and Cordaicarpus truncata have typical characteristics of pioneer plants, exhibiting barochory as their primary dispersal syndrome with other syndromes associated.

【 授权许可】

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