Fatores que influenciam a distribuição da herbácea Heliconia acuminata L. C. Rich (Heliconiaceae) em subosque na Amazônia central
Abstract
The determinants of species distribution are continually questioned by
researchers. What we know is that depending on the scale of approach such patterns
may respond with different magnitudes. We did three approaches with different
experimental designs with a common understory plant specie in central Amazonia. In the
first chapter, we tested for the density-dependece on growth and mortality of seedlings.
The results indicate that seedlings can grow less when alone in the natural environment,
however, not observed experimentally. The second chapter, we describe the effects of
neighborhood in reproductive effort. The reproductive frequency and intensity proved
inconsistent spatially and temporally, the light was best explained the variation between
neighborhood effects. And finally we explore the explanatory factors on Heliconia
acuminata L. C. Richard (Heliconiaceae), distribution in mesoscale and landscape scale.
The mechanims approach on a landscape scale becomes less representative by soil
components distribution associated with altimetry in landscape set distribution patterns.
The seedling emergence spatial pattern overlaps with the density in breeding and
reproductive individuals, increase in occupancy around these individuals, independent of
sample scale. In this scenario, we analized the density-dependence effects, neighbor
effects and explanatory factors on H. acuminata in the three following chapter.