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trabalhos:abstracts [2021/05/27 00:15] jennifervasconcelosjdsv2 |
trabalhos:abstracts [2021/05/27 00:46] jennifervasconcelosjdsv2 |
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| **Abstract:**Many studies have been proving the importance of positive interactions to the distribution and diversity of species in plant communities. Positive and negative interactions occur simultaneously and the net effect of a species on another is the product of these combined interactions. The objetive of the present study was to evaluate if nitrogen fixing legumes facilitate other tree species in a nitrogen poor environment. We studied the effect of the presence of legumes on the density of species and individuals belonging to two different layers (DBH > 1 cm and 1≤ DBH ≥ 10 cm) around them and also patterns of spatial association between the legumes and other tree species, using a null models approach. The results obtained were dependent on the legume species considered. In chapter 1, the legume Balizia pedicellaris (DC.) Barneby & J.W.Grimes presented higher species density around it, for both layers, although there was no effect on the density of individuals. The species Ormosia arborea Harms did not present effect on the density of species and individuals around it. For the first layer Andira anthelmia (Vell.) J. F. Macbr. did not show effect on the densities, but this species presented a negative effect on the density of species and individuals of the upper layer (1 ≤ DBH ≥ 10 cm), in opposition to our hypothesis. In chapter 2, the spatial association patterns were also distinct between the legume species that showed different species identity associated and different kinds of association (positive or negative). The results indicate that, in spite of belonging to the same functional group, the legumes influence the species around them differently, depending on their morphological and physiological characteristics, as the ability to fix nitrogen in some systems or even the ability to produce alellopathic compounds. | **Abstract:**Many studies have been proving the importance of positive interactions to the distribution and diversity of species in plant communities. Positive and negative interactions occur simultaneously and the net effect of a species on another is the product of these combined interactions. The objetive of the present study was to evaluate if nitrogen fixing legumes facilitate other tree species in a nitrogen poor environment. We studied the effect of the presence of legumes on the density of species and individuals belonging to two different layers (DBH > 1 cm and 1≤ DBH ≥ 10 cm) around them and also patterns of spatial association between the legumes and other tree species, using a null models approach. The results obtained were dependent on the legume species considered. In chapter 1, the legume Balizia pedicellaris (DC.) Barneby & J.W.Grimes presented higher species density around it, for both layers, although there was no effect on the density of individuals. The species Ormosia arborea Harms did not present effect on the density of species and individuals around it. For the first layer Andira anthelmia (Vell.) J. F. Macbr. did not show effect on the densities, but this species presented a negative effect on the density of species and individuals of the upper layer (1 ≤ DBH ≥ 10 cm), in opposition to our hypothesis. In chapter 2, the spatial association patterns were also distinct between the legume species that showed different species identity associated and different kinds of association (positive or negative). The results indicate that, in spite of belonging to the same functional group, the legumes influence the species around them differently, depending on their morphological and physiological characteristics, as the ability to fix nitrogen in some systems or even the ability to produce alellopathic compounds. | ||
| + | |||
| + | === MORAES, Adriana de Olinda === | ||
| + | |||
| + | **Effect of anthropized matrices on the epiphyte community of understory in forest fragments of Southern Bahia, Brazil** | ||
| + | |||
| + | **Abstract:** The landscape mosaic of the southern state of Bahia consists of forest fragments, pasture | ||
| + | areas and shaded cacao (//Theobroma cacao L.//) plantations (cabruca). The cacao | ||
| + | agroforestry matrix is considered efficient to the conservation of several species compared | ||
| + | to the other agricultural systems, because it preserves large trees of the original forest. | ||
| + | Therefore, we investigated the influence of the both matrixes on the community of vascular | ||
| + | epiphytes and hemiepiphytes richness and abundance in Wildlife Refuge – Una Biological | ||
| + | Reserve (Revis-REBIO), Una, Bahia, Brazil. Eight plots (10 x10 m) were installed at the | ||
| + | edge (5-10 m) and eight plots in the interior (100 m) of four fragments with cabruca matrix | ||
| + | and four fragments with pasture matrix. A total area of 12.800 m2 was sampled. All trees | ||
| + | with circumference at breast height (CBH) ≥ 5 cm the circumference were measured and | ||
| + | the number of epiphytes and hemiepiphytes was counted up to three meters tall. We | ||
| + | sampled 10.557 trees and 4.057 were phorophytes that housed 57 species of epiphytes and | ||
| + | 30 of hemiepiphytes, distributed in 20 families. A total of 7984 individuals were sampled. | ||
| + | The family with the highest number of species was Araceae (20 spp.) and the most | ||
| + | abundant species was //Philodendron surinamense// (2.150 individuals). About matrix | ||
| + | influence, the interior of fragments surrounded by a pasture matrix had the highest values | ||
| + | of abundance and richness of epiphytes and hemiepiphytes. The abundance of epiphytes | ||
| + | was significantly higher (p<0,001) in the fragments with pasture matrix. Hemiepiphytes | ||
| + | were also more abundant within fragments with pasture matrix. The fragments inserted | ||
| + | into the pasture matrix had significantly (p< 0,02) more species than the fragments | ||
| + | immersed in the cabruca matrix. For hemiepiphytes, the plots of the interior of the | ||
| + | fragments had significantly (p= 0,0007) more species than the edge plots. The edge of | ||
| + | fragments inserted in pasture matrix had a higher average number of trees than the interior | ||
| + | and in plots inserted in the interior of fragments with cabruca matrix, there were a higher | ||
| + | average number of trees than the edge. The largest circumferences and the largest number | ||
| + | of phorophytes were in fragments with pasture matrix. Overall, in cabruca matrix | ||
| + | fragments, the epiphytes and hemiepiphytes occurred on the phorophytes with the larger | ||
| + | perimeter and on interior of pasture matrix fragments, the epiphytes occupied the trees | ||
| + | with larger perimeter and hemiepiphytes occupied both the edge and interior, trees with the | ||
| + | larger CBH The sampling units were not grouped within the same condition. Anetium | ||
| + | citrifolium was an indicator species of the interior of fragments in the pastures matrix. | ||
| === PANNUTI, Márcia Ione da Rocha === | === PANNUTI, Márcia Ione da Rocha === | ||
trabalhos/abstracts.txt · Última modificação: 2021/12/08 01:28 por jennifervasconcelosjdsv2
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