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Secreted salt and hydrodynamic factors combine to affect dynamic fluctuations of microplastics on mangrove leaves
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Researchers tracked microplastic accumulation on mangrove leaves over time and found that submerged leaves showed much greater variation in contamination levels compared to non-submerged leaves. They identified salt secretion from the leaves and tidal water movement as key factors driving the dynamic fluctuations in microplastic interception. The study provides new insight into how mangrove ecosystems act as natural traps for coastal microplastic pollution.
Mangrove leaves have been acknowledged as crucial sink for coastal microplastics (MPs). Whereas, the temporal dynamics of MPs intercepted by mangrove leaves have remained poorly understood. Here, we detected MPs intercepted by submerged and non-submerged mangrove leaves over time and the potential driving factors. Abundance and characteristics of MPs interception by mangrove leaves exhibited dynamic fluctuations, with the coefficient of variation (CV) of submerged mangrove leaves (CV = 0.604; 1.76 n/g to 15.45 n/g) being approximately twofold higher than non-submerged mangrove leaves (CV = 0.377; 0.74 n/g to 3.28 n/g). Partial least squares path model (PLS-PM) analysis further illustrated that MPs abundance on submerged mangrove leaves were negative correlated to hydrodynamic factors (i.e., current velocity and tidal range). Intriguingly, secreted salt as a significantly driver of MPs intercepted by mangrove leaves. Results of this work highlights that MPs intercepted by mangrove leaves is characterized by dynamic fluctuations and reveals the importance of hydrodynamic factors and secreted salt. Overall, this work identifies the pivotal buffering role played by mangrove leaves in intercepting MPs, which provides basic knowledge for better understanding of microplastic pollution status and control from mangrove plants.
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Researchers found that nanoplastics landing on mangrove leaves behave very differently depending on the species: salt-secreting mangroves accumulate nanoplastics in their salt glands and transport them deep into leaf tissues, disrupting the carbon-fixing dark reactions of photosynthesis, while salt-excluding mangroves trap particles on the leaf surface instead, blocking light capture. This matters because salt-secreting mangroves act as biological concentrators of airborne nanoplastics, potentially undermining the carbon storage function of coastal ecosystems.
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