Banca de DEFESA: JEANNE RAQUEL DE ANDRADE FRANCO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JEANNE RAQUEL DE ANDRADE FRANCO
DATA : 14/02/2017
HORA: 08:00
LOCAL: Auditório da Direção da EAJ
TÍTULO:

Intraspecific interaction and abiotic characterization in mangrove area influenced by shrimp farming

PALAVRAS-CHAVES:

Abiotic variables; Competition; Density-dependence; Growth Rhizophora mangle; Facilitation; Restoration; Self-thinning.

PÁGINAS: 45
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Conservação da Natureza
ESPECIALIDADE: Recuperação de Areas Degradadas
RESUMO:

Mangroves are ecosystems coastal and estuarine belonging to warm temperate and wet tropics, mangroves are dominated by woody species, provide important ecosystem goods and services and have socioeconomic value. Mangroves are sensitive to disturbances and are constantly being degraded due to urban development. Interactions between plant individuals may result in competition and facilitation by interfering with the pattern of distribution, plant growth and survival, besides modifying physical-chemical characteristics of the environment. Abiotic and biotic variables interact allowing the analysis of the adaptation of the species in different environmental conditions and also infer about the intensity of degradation. The main objective of the study was to identify the main limiting factors on the growth and survival of Rhizophora mangle L. (Rhizophoraceae) plants in two intraspecific environments located in the shrimp farming area, one with trees and closed canopy, and another open with young and sub-shrub plants. Two monitoring were carried out with selection of plots and plants in each environment, totaling 90 individuals, to quantify the growth by means of measures of height, number of branches and diameter at 30 cm of the soil for 16 months. For the abiotic variables, measurements of soil temperature and pH, luminosity, salinity, air velocity and temperature and soil penetrability were taken in the plots of each open and closed environment for 12 months. Adult individuals of Rhizophora mangle were intraspecific competitors interfering in the growth of young plants of the same species through the limitation of light and of the stress coming from the accumulation of sediments. In the open environment, with young plants presenting the same age and distributed in an aggregated way, facilitation occurred with reduction of stressful conditions due to the higher incidence of solar radiation and temperature of this environment, and also competition through high density of plants. Due to these positive and negative interactions acting simultaneously, the final effect of density dependence on plant growth of the open environment was neutral. However, mean temperatures of 30 ° C, soil pH values between 5.5 and 6.5 and salinity with about 35 ppm were factors that benefited the growth of the plants over time in open environment through photosynthesis, of physiological adaptations and possible better assimilation of soil nutrients. These results helped to understand the environmental aspects that facilitate the recovery of areas degraded by shrimp farming.

MEMBROS DA BANCA:
Presidente - 1605704 - SIDNEY CARLOS PRAXEDES
Externo ao Programa - 345793 - RENATO DE MEDEIROS ROCHA
Externo à Instituição - JOSÉ ESPÍNOLA SOBRINHO - UFERSA