Mangrove propagule size and oil contamination effects: Does size matter?

Area of Science:

• Marine Biology
• Ecology
• Environmental Science

Background:

• Mangrove ecosystems are vital coastal buffers.
• Oil spills pose a significant threat to coastal vegetation.
• Differential tolerance among mangrove species to pollutants is poorly understood.

Purpose of the Study:

• To investigate the impact of oil contamination on three mangrove species with varying propagule sizes.
• To determine the factors influencing differential oil tolerance in mangroves.

Main Methods:

• Glasshouse and field experiments were conducted.
• Sediment, propagules, leaves, and stems of three mangrove species were subjected to oil contamination.
• Growth parameters, including plant height, leaf number, and chlorophyll content, were monitored.

Main Results:

• Oil contamination significantly reduced plant height, leaf number, chlorophyll content, and induced abnormalities, abscission, and mortality.
• Avicennia marina exhibited the highest susceptibility, followed by Rhizophora mucronata, and then Bruguiera gymnorrhiza.
• Susceptibility was linked to early pericarp shedding and rapid post-detachment development, not propagule size.

Conclusions:

• Avicennia marina's high susceptibility to oil is attributed to its developmental strategy rather than propagule size.
• Micromorphological features like trichomes, salt glands, and protective barriers influence post-emergence oil tolerance in mangroves.