Growth, abundance, and diversity of black mangrove (Avicennia germinans) pneumatophores in deforested and sand-filled mangrove forest at Eagle Island, Niger Delta Nigeria

Author:

Numbere Aroloye1,Camilo Gerardo2

Affiliation:

1. University of Port Harcourt

2. Saint Louis University

Abstract

Abstract Pneumatophore is a major channel of oxygen circulation in mangrove forest. It is hypothesized that soil condition, canopy cover and stagnant pool of water can influence pneumatophore growth. Pneumatophore abundance, diversity indices, microbial and chemical composition in sand-filled mangrove forest was studied. Six plots were established within a rectangular area measuring 4152.24m2 in a random block design to investigate the effect of soil conditions on pneumatophore growth. A total of 9,586 pneumatophores were physically counted and differentiated into four types namely 1-branch, 2-branch, 3-branch, and 4-branch pneumatophores. The ANOVA results shows that there is significant difference in the abundance of pneumatophore types (F3, 20 = 7.61, p < .001). The most abundant pneumatophore type is the one branch pneumatophore (n = 4747) while the least is the four branched pneumatophores. The stagnant pool site with silty and muddy soil has the most abundant pneumatophore growth whereas plots in the seashore site with sandy soil has the least abundant pneumatophores. In contrast, the seashore site has the highest diversity (H = 1.367) while the stagnant pool has the lowest diversity (H = 0.956). Metal concentration was higher in the stagnant pool site while microbial count is higher in the seashore site. The study shows that soil condition, canopy cover, stagnant pool plus tidal action influenced pneumatophore growth.

Publisher

Research Square Platform LLC

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