Diminishing mangrove forest structures in Davao City, Philippines
John Glen B Seniel | Lea A. Jimenez | Emily S Antonio
Discipline: environmental sciences
Abstract:
The decline of mangrove coverage across the Philippines to 50% of its original
coverage in present years has, led to significant reductions of ecological functions to
fisheries and benefits to man. The mangrove forest in Davao City was assessed for its
taxonomic list, Importance Value Index, abundance and distribution of mangrove
regenerations, forest structure, and species diversity status. The study was conducted
in Barangay Bunawan, Lasang, Panacan, Matina Aplaya, 76-A, and Bago Aplaya.
All data were gathered by establishing sampling plots (10m x 10m) using the modified
transect-plot method. Overall, a total of 34 mangrove species were listed, of which 21
were identified as true mangroves and 13 as mangrove associates. The 21 mangrove
species were very low in species richness (54%). Importance Value Index showed that
Avicennia marina, Rhizophora apiculata, and Sonneratia alba, respectively, as dominant
mangrove species. The mangrove regenerations were in poor condition (<0.50) while
relative abundances of growth stages consisted of mature stands at 46.04%, saplings
with 27.78%, and seedlings with 26.18%. General diversity indices obtained a low value
on the Shannon-Wiener diversity index (H'=1.42) and an average value on the species
evenness index (E=0.61), all indicating stressful and unstable mangrove forests. Thus,
the mangrove forest ecosystem has imbalances and eventually, only certain species
would survive.
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