الفهرس 
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Abstract
This study was conducted on naturally growing mono specific mangrove species Avicennia marina (Forssk.) Vierh. in southern Sinai in two protected areas, Nabq and Ras Mohammed between 2008-2010. Total mangrove cover estimation was 50.993 ha, 94.76% of them exist in intertidal habitat, the remaining percent distributed between sand mounds (0.77%), shore line (3.04%) and salt plains (1.43%) habitats. Drawing of Google Earth™ and ground-truthing based detailed maps for the coastal zones in the studied sites showing distribution of mangrove vegetation in all present habitats, comparing 30 years change in mangrove cover showed actual increase in mangrove and clear tendency of mangrove to leave exposed inter tidal zones to inhabit higher lands since many signs of sea level rise were observed in several areas of coastal zones. Transplanted mangroves since 2006 in both Ras Mohammed and Nabq showed good progression 3 years after plantation. Comparing trees structural parameters, health, density, seasonal formation of productivity outputs, seedlings settlement and levels of human impact were conducted between different habitats showed shore line mangroves are subjecting to higher levels of impact while sand mound mangroves are less impacted, Ras Mohammed mangrove was historically exposed to several crude oil pollution incidences and still continuously exposed to routine arrival of small tar balls, signs of passive impact of oil pollution are clearly observed. Monitoring change in trees structural parameters along line belt transects allocated perpendicular to the shore line showed that trees total heights, basal areas and canopy volume having a dominant pattern of increasing moving landward-seaward till reaching their maximum records in the mid forest then starts to decrease again till reaching the forest end at the sea side, but other changing pattern were observed when transect cuts creeks or ended with lagoons.