Factores que afectan la propagacion y establecimiento de Avicennia germinans L. en ambientes degradados de regiones semiaridas subtropicales (Spanish text)

Massive mortality in mangrove stands was reported during the 1990's in Jobos Bay National Estuarine Research Reserve (JOBANNER). At the present the recruitment and growth of Avicennia germinans seedlings are negligible. This work strives to examine biotic and abiotic factors that affect recruitment and development of A. germinans in the study area.; Long-term mangrove cover at JOBANNER was examined in aerial photographs between 1963 and 2002 as part of ancillary effort to quantify the decline of mangrove. Density of A. germinans, inundation level, temperature and salinity in water and sediments were measured during a year along transects oriented perpendicular to the coastline. Two transects were located in the mortality area known as Mar Negro and the third at an eastern control station within JOBANERR named Aguirre. Seed production from June-December was estimated and seeds retention was assessed in June and September-December. The growth and survival of A. germinans seedlings in a nursery cultivated at salinities of 0, 35, 65 and 95 (practical salinity) were evaluated. (Abstract shortened by UMI.)...