#Pit of 100 trials ttyd full#
#Pit of 100 trials ttyd series#

With the exception of two species common to abandoned pastures and river banks, the species used in the shade-house growth experiments did not show significant increases in growth with increases in light from 20% to 40%.

#Pit of 100 trials ttyd full#

In similar light environments in the shade-house, melastome seedling survival was between 80% and 100%, and growth increased with increasing light levels from 2% (corresponding to understory sites) to 20% (small gap centers) of full sun. After 1 yr, these seedlings were small (<2 cm tall) and produced few leaves. In contrast to the germination trials, emergence percentages in the field ranged from 4% in understory sites to 21 % in gap centers. Seeds of three common species were sown directly into different microsites within gaps and understory control sites. With one exception, seeds of shade-tolerant species germinated more slowly following passage through birds, while seeds from high-light- demanding species germinated more rapidly after passing through birds. Comparisons of germination rates between seeds collected from bird droppings and seeds extracted from fruits by hand gave varied results.

#Pit of 100 trials ttyd series#

In a series of germination trials in vitro, most seeds germinated readily within 1-2 wk. Seedlings were more common in the root pits and on the root mounds of uprooted trees, even though there was less light available to the seedlings in these microsites than elsewhere in the gaps. This pattern was generally applicable to all melastomes studied, regardless of the habitat where adults were normally most abundant. Established seedlings were significantly more abundant in gaps than in nearby under- story sites. We examined germination patterns in vitro (22 species), effects on germination of passage through birds (5 species), seedling establishment in the field (3 species), and growth in different light environments (8 species). We investigated intra- and interspecific variability in early life history characteristics of understory Melastomataceae species of different growth forms and adult distributions from the lowland tropical rain forest at La Selva Biological Station, Costa Rica. Woody plants of the forest understory, subcanopy trees and shrubs, are known to affect significantly regeneration dynamics in treefall gaps, yet we lack fundamental information on life history characteristics of understory plants that could permit their incorporation into gap regeneration models. These paradigms are derived from studies of a small number of species whose life history traits place them easily into pioneer or climax species.

Models of gap-phase regeneration in tropical wet forests are based primarily on studies of canopy trees.