(Institute of Entomology, Biology Centre CAS, Czech Republic) absztraktja:
Title: Increasing habitat loss and anthropogenic activities in the Sundarbans: A major threat on the mangrove pollinator communities and plant reproduction
The Sundarbans, largest mangrove forest in the world, facing the increasing pressure of habitat loss and human exploitation over the years. Yet, no information is available about how these factors affect the plant-pollinator interactions in this world heritage ecosystem. This research was first effort to study of the impact of habitat loss and anthropogenic activity on plant-pollinator interactions and their impact on plant reproduction. Sites were selected in Shyamnagar, north-western region of Sundarbans in Bangladesh and the degree of habitat loss and anthropogenic activities were defined by plant diversity and the distance of the sites throughout the human settlement to intensive forest.
Pollinators were observed and collected from two focal plant species, Avicennia officinalis and Acanthus ilicifolius. We found giant honey bee and solitary bees are the major pollinators in this forest, but giant honey bees declined with the changing habitat. Apis dorsata were mostly abundant in the deeper forest but decreased in the forest patches nearby villages and replaced by the Apis cerana, managed honey bee in that area. Both plant species received a wide range of solitary bees but only A.officinalis received other pollinators like flies, wasps and butterflies. Seed production was higher per fruit for A. ilicifolius in the least disturbed forest sites, indicated that mangrove pollinators are more efficient. This study concluded that plant-pollinator interactions are sensitive to the changing environment and loss of mangrove pollinators have a negative impact on the pollination success of plants of the Sundarbans.