Diaspore bank of bryophytes in tropical rain forests: the importance of breeding system,phylum and microhabitat |
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Authors: | Adaíses S Maciel-Silva Ivany Ferraz Marques Válio Håkan Rydin |
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Institution: | 1.Departamento de Botanica, Instituto de Biologia, CP 6109,Universidade Estadual de Campinas-UNICAMP,Campinas,Brazil;2.Department of Plant Ecology, Evolutionary Biology Centre,Uppsala University,Uppsala,Sweden |
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Abstract: | Diaspore banks are crucial for the maintenance and resilience of plant communities, but diaspore banks of bryophytes remain
poorly known, especially from tropical ecosystems. This is the first study to focus on the role of diaspore banks of bryophytes
in tropical rain forests. Our aim was to test whether microhabitat (substrate type) and species traits (breeding system, phylum)
are important in explaining the diaspore bank composition. Using samples cultivated in the laboratory, we assessed the number
of species and shoots emerging from bark, decaying wood and soil from two sites of the Atlantic rain forest (montane and sea
level) in Brazil by comparing the contribution of species by phylum (mosses, liverworts) and breeding system (monoicous, dioicous).
More species emerged from bark (68) and decaying wood (55) than from soil (22). Similar numbers of species were found at both
sites. Mosses were more numerous in terms of number of species and shoots, and monoicous species dominated over dioicous species.
Substrate pH had only weak effects on shoot emergence. Species commonly producing sporophytes and gemmae had a high contribution
to the diaspore banks. These superficial diaspore banks represented the extant vegetation rather well, but held more monoicous
species (probably short-lived species) compared to dioicous ones. We propose that diaspore bank dynamics are driven by species
traits and microhabitat characteristics, and that short-term diaspore banks of bryophytes in tropical rain forests contribute
to fast (re)establishment of species after disturbances and during succession, particularly dioicous mosses investing in asexual
reproduction and monoicous mosses investing in sexual reproduction. |
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