Pollinators necessary for the reproductive success of critically endangered mangrove, Sonneratia griffithii

 Mangrove forests provide numerous ecosystem services, yet are disappearing rapidly. One such mangrove species negatively affected by deforestation and land conversion is Sonneratia griffithii, a critically endangered but understudied species. To understand its reproductive biology, we conducted a pollination experiment and observed flower visitors that potentially pollinate this mangrove species. All experimental treatments produced fruit set to varying degrees. Results suggest that S. griffithii is suffering from inbreeding depression and is dependent on pollinators. Two bat species were mist-netted near S. griffithii flowers: Macroglossus minimus and Eonycteris spelaea. To protect this mangrove species, we recommend encouraging cross pollination by bats through local area and pollinator protection, as well as creating corridors between mangrove forest patches. This research addresses SDG 15 to “protect, restore and promote sustainable use of terrestrial ecosystems… and halt biodiversity loss.”

Figure 1. (A) Sonneratia griffithii flowers, unopened but with exserted style (left) and after anthers have fallen (right); (B) fully open S. griffithii flower; (C) Macroglossus minimus and (D) Eonycteris spelaea bats caught near S. griffithii flowers.

Nuevo Diego CE, Stewart AB, Bumrungsri S. 2021. Pollinators necessary for the reproductive success of critically endangered mangrove, Sonneratia griffithii. Aquatic Botany, 169:103340.