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Microplastic pellets do not affect heat stress-induced night-time respiration in the brown alga Fucus serratus
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Scientists tested whether tiny plastic particles affect a type of seaweed that lives along coastlines when exposed to heat stress. They found that heat alone stressed the seaweed, but the plastic particles didn't make things worse or cause additional harm. This suggests that these important coastal plants might be more resilient to plastic pollution than expected, which is good news since healthy seaweed ecosystems help protect our coastlines and support marine food webs that humans depend on.
Brown macroalgae like Fucus serratus are key ecosystem engineers in intertidal environments and are increasingly threatened by anthropogenic pollution and global change. This study examined how the combined effects of conventional and biosourced microplastic (MP) pellets and thermal stress affect the night-time respiration of F. serratus. Respiration rates were assessed after algae were exposed to a combination of aerial temperature treatments (6 h at 25°C as control or 35°C as a heat stress) and five immersed MP treatments (6 h exposure to control seawater, polypropylene, polypropylene with a biological matrix, polylactic acid or biopolyester solutions; n = 5 per treatment) in darkness. Our results showed a significant increase in respiration following heat stress, independent of MP exposure, suggesting a sustained metabolic stress-repair response and may indicate a cost to carbon balance and long-term tolerance. However, no significant effect of MP or interaction between stressors was detected. These findings suggest short-term resilience of F. serratus to MP exposure under the tested conditions. In an era of global change, further research on the combined and long-term effects of multiple stressors, including MP, on key physiological processes across seasons and species is needed to clarify their ecological consequences for intertidal macroalgal communities.
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Supplementary material from " Microplastic pellets do not affect heat stress induced night-time respiration in the brown alga Fucus serratus "
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Researchers tested whether conventional and biosourced microplastic pellets combined with heat stress affect night-time respiration in the brown alga Fucus serratus. The study found that while heat stress significantly increased respiration rates, the presence of microplastic pellets did not add to this effect, suggesting that short-term microplastic exposure may not compound thermal stress impacts on this intertidal seaweed species.
Supplementary material from " Microplastic pellets do not affect heat stress induced night-time respiration in the brown alga Fucus serratus "
AI summary Read the abstract
Researchers tested whether conventional and biosourced microplastic pellets combined with heat stress affect night-time respiration in the brown alga Fucus serratus. The study found that while heat stress significantly increased respiration rates, the presence of microplastic pellets did not add to this effect, suggesting that short-term microplastic exposure may not compound thermal stress impacts on this intertidal seaweed species.
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Data from: Microplastics reduce eelgrass tolerance to heat stress with implications for restoration and blue carbon
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