Effects of wildfire ash on the fatty acid and sugar profiles of bivalves – a comparative study of a freshwater and a marine species

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2024-12-16 DOI:10.1016/j.envpol.2024.125540

Fátima Jesus, Filipa Mesquita, Dalila Serpa, Elisa Virumbrales Aldama, Luísa Magalhães, Ana Ré, Isabel Campos, Nelson Abrantes, Joana L. Pereira, Fernando J.M. Gonçalves, António J.A. Nogueira, Ana M.M. Gonçalves

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Abstract

Wildfires can impact both freshwater and marine ecosystems through post-fire runoff, but its effects on bivalves, particularly those living in marine habitats, remain largely overlooked. While evidence exists that wildfire ash can alter the fatty acid (FA) and sugar profiles of aquatic biota, its influence on the biochemical profiles of bivalves have not been addressed to date. This study aimed to assess the effects of ash exposure on the FA and sugar profiles of two bivalve species used for human consumption: a freshwater clam (Corbicula fluminea) and a marine bivalve (Cerastoderma edule), additionally evaluating potential effects on their nutritional value. Both species were exposed to environmentally relevant concentrations of aqueous extracts of Eucalypt ash (AEAs) for 96 hours. Results showed species-specific responses to ash extracts exposure, with more pronounced effects on C. edule. This species exhibited a trend for reduced FA content, statistically significant for C17:0 but also evident for unsaturated FAs, which is relevant for human health as they represent a decrease in the nutritional value. Conversely, an increase in the sugar content of this species was observed with increasing AEA concentrations, despite only statistically significant for galactose and xylose. In contrast, the clams exhibited only minor effects, showing a trend for increased FA and decreased sugar contents, but only significant for the monounsaturated FA content. This study suggests a higher sensitivity of marine bivalves to wildfire ash compared to their freshwater counterparts. Moreover, it highlights, for the first time, the potential of post-fire runoff to alter the biochemical profiles of bivalve species, raising concerns about broader impacts on aquatic trophic webs and human health, an issue that becomes particularly relevant given the forecasted increase in wildﬁre’s frequency and extension due to global warming.

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野火会通过火后径流影响淡水和海洋生态系统，但其对双壳类动物，尤其是生活在海洋栖息地的双壳类动物的影响在很大程度上仍被忽视。虽然有证据表明野火灰烬会改变水生生物群的脂肪酸（FA）和糖类特征，但其对双壳贝类生化特征的影响迄今尚未得到研究。本研究旨在评估野火灰暴露对两种供人类食用的双壳贝类（淡水蛤蜊（Corbicula fluminea）和海洋双壳贝类（Cerastoderma edule））的脂肪酸和糖特征的影响，同时评估对其营养价值的潜在影响。这两种生物均暴露于环境相关浓度的桉树灰水提取物（AEAs）中 96 小时。结果表明，桉树灰萃取物对不同物种有不同的影响，其中对 C. edule 的影响更为明显。该物种的不饱和脂肪酸含量呈下降趋势，C17:0 的不饱和脂肪酸含量在统计学上有显著意义，但不饱和脂肪酸的不饱和脂肪酸含量也很明显，这与人类健康有关，因为它们代表着营养价值的下降。相反，随着 AEA 浓度的增加，该物种的糖含量也有所增加，尽管只有半乳糖和木糖的糖含量具有统计学意义。相比之下，蛤蜊的影响较小，显示出脂肪酸含量增加和糖含量减少的趋势，但只对单不饱和脂肪酸含量有显著影响。这项研究表明，与淡水双壳类动物相比，海洋双壳类动物对野火灰的敏感性更高。此外，它还首次强调了火灾后径流改变双壳类生物生化特征的可能性，引起了人们对水生营养网和人类健康的广泛影响的关注。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.