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Variations in the survival probabilities of the PVC-protected red mangrove propagules: testing the encased replanting technique
López-Ortiz, Myrna I; Pérez, Cynthia M; Suárez, Erick; Ríos-Dávila, Rafael.
  • López-Ortiz, Myrna I; University of Puerto Rico. Medical Science Campus. Graduate School of Public Health. Department of Environmental Health.
  • Pérez, Cynthia M; University of Puerto Rico. Medical Science Campus. Graduate School of Public Health. Department of Biostatistic and Epidemiology.
  • Suárez, Erick; University of Puerto Rico. Medical Science Campus. Graduate School of Public Health. Department of Biostatistic and Epidemiology.
  • Ríos-Dávila, Rafael; University of Puerto Rico. Medical Science Campus. Graduate School of Public Health. department of Environmental Health.
P. R. health sci. j ; 18(4): 387-95, dez. 1999. ilus, graf
Artigo em Inglês | LILACS | ID: lil-260832
ABSTRACT
The EcoEléctrica Mangrove Planting Project, a five-year voluntary effort, has the purpose of testing a recently developed mangrove planting technique at the EcoEléctrica site in Peñuelas, Puerto Rico. The goal of the project is to provide empirical validation to promote or improve the technique to be used in recovering mangrove ecosystems in Puerto Rico and United States. The research presented herein analyzed the information collected on the first two years of the project. The proportions of remaining casings and seeds per study zone were compared using the chi-square distribution. Zone 1 had the least pipes lost while Zone 4 had the most (p < 0.05). Forty-three percent of the seeds in Zone 1 remained in the casing, while 26 percent remained in Zone 2 (p = 0.03). Median growth rates of seeds per study zone showed that Zone 1 had the highest median growth rates. Survival analysis described the survival experience of the seeds, and differences in survival probabilities were compared with the log-rank test. Zone 1 seeds had a better survival experience compared to Zones 2, 3 and 4 (p < 0.0001). Survival probabilities for being free of spots were over 60 percent during the whole study period. No significant differences were observed in the survival experience with the use-or-no use of casing extensions (p = 0.40), and the use-or-no use of nursed seeds (p = 0.26). Differences in survival probabilities might be attributed to variations in wave energy, depth or substrate conditions. This hypothesis will be evaluated in the second phase of the study.
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Índice: LILACS (Américas) Assunto principal: Árvores / Conservação dos Recursos Naturais País/Região como assunto: Caribe / Porto Rico Idioma: Inglês Revista: P. R. health sci. j Assunto da revista: Medicina Ano de publicação: 1999 Tipo de documento: Artigo

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Índice: LILACS (Américas) Assunto principal: Árvores / Conservação dos Recursos Naturais País/Região como assunto: Caribe / Porto Rico Idioma: Inglês Revista: P. R. health sci. j Assunto da revista: Medicina Ano de publicação: 1999 Tipo de documento: Artigo