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--- trabalhos:abstracts [2021/12/07 22:32]
jennifervasconcelosjdsv2
+++ trabalhos:abstracts [2021/12/07 23:59]
jennifervasconcelosjdsv2
@@ Linha 280: / Linha 280: @@
 =====Monografias (Iniciação Científica e trabalhos de conclusão de graduação)=====
-**AULER**, Jennifer Prestes
+=== AULER, Jennifer Prestes ===
 **Environmental heterogeneity and the spatial distribution of Amazonia's trees**
@@ Linha 286: / Linha 286: @@
 **Abstract:** Niche and dispersal limitation are important coexistence mechanisms that can spatially structure tree communities. We aimed to verify the influence of environmental heterogeneity in the relative importance of those processes. We used data from ForestGEO plots with different environmental heterogeneity (Colombia-CO < Brazil-BR < Ecuador-EQ). We selected the most plausible of four concurrent spatial models: Randomness (CSR), Niche (NH), Dispersal Limitation (DL), and both (NH+DL). BR e EQ didn't diverge in the probability of model selection, having 85,6% and 83% of niche models selected (NH and NH+DL), while in CO only 57,5% were observed. The proportion of no model selected was four times higher in CO than in BR and EQ. We attribute these differences to CO's lesser environmental heterogeneity and conclude that it influences the relative importance of processes. Plots with a higher proportion of coexistence mechanisms are also significantly more diverse (BR and EQ > CO).
+=== PEREIRA, Thiago ===
+**Effects of light quality on seed germination of Myrtaceae species from restinga of Cardoso Island**
+**Abstract:** The Myrtaceae family is one of the most ecologically important families, mainly in the Atlantic forest, being the dominant family in diverse tropical forests. Specifically in 3restinga" (coastal sandy plains) areas, Myrtaceae is noted for high species richness, being among the trees, often the most diverse. However there are few studies about the ecology and physiology of this family. Knowledge about the conditions for seed germination, in the case of Myrtaceae species, may increase the success in producing of seedlings in nurseries for use in forest restoration The analysis of light requirements for germination of the Myrtaceae species provides data that can be useful both in evolutionary studies about the family Myrtaceae, as to indicate the correct phase of succession to use of these species of Myrtaceae occurring in the Ilha do Cardoso in restoration projects in tropical areas. The germination of seeds of three species, Eugenia umbelliflora, Myrcia multiflora and Blepharocalyx salicifolius, were analyzed in a white light treatment and in the control (dark). An analysis of seed germination under distinct Red/Far red ratios was also performed for the species Eugenia umbelliflora. The seeds of the three species germinated in the presence of light and in the dark, indicating that the seeds have great environmental plasticity about light and can occupy different habitats. E. umbelliflora and B. salicifolius probably have their germination controlled by phytochrome A (phyA), using a Very Low Fluence Response (VLFR). The
+species M. multiflora show a higher germination rate under white light, which could indicates positive photoblastic seeds, but this classification requires complementary studies. Tests at different levels of R / FR for E. umbelliflora reinforce that this species has wide environmental plasticity, with the ability to germinate both in treefall gaps and under the canopy.

Laboratório de Ecologia de Florestas Tropicais

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