perception de la population sur l’utilisation et la gestion des herbiers marins, cas de la baie de ranobe, sud-ouest de madagascar

Abstract

Seagrass beds are aquatic angiosperms that occur in the shallower water of marine
coastlines. This ecosystem is of great importance to the coastal community and adjacent
ecosystems through its ecosystem services but is currently undergoing all forms of pressure
from natural and anthropogenic sources.
This study was conducted in May 2020 to January 2021 in the Ranobe Bay’s villages
of fishers, south western of Madagascar : Andrevo, Ambolomailaky, Amboaboaky, Mangily
and Ifaty and focused specifically on the local perception of seagrass, with the objectives of
learning about the use of the seagrass, the threats that exist and the form of management that
is being applied. In order to achieve these objectives, surveys of the local population were
conducted to collect their opinions.
The results showed that 93.52 % of the respondents use the seagrass meadow as a
fishing ground whereas 95 local family for aquaculture beneficiary. 70% of the participants
stated that the seagrass in the study area were degraded. Among the factors of degradation is
the use of mosquito nets, which covers 59% of the direct threats identified followed by the
beach seine at 28%. The use of mosquito nets is linked to ethnic diversification and the
scarcity of livelihood. Moreover, no form of management for the use of these fishing gears
neither for the protection of seagrass has been recognised in Ranobe bay, hence the
persistence of those threats.
Key words : Seagrass, bay of Ranobe, survey, threats, management