A systematic review of marine macroalgal degradation: Toward a better understanding of macroalgal carbon sequestration potential.

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Jessica R Kennedy, Caitlin O Blain
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Abstract

Although macroalgae are gaining recognition for their potential role in marine carbon sequestration, critical knowledge gaps related to the fate of macroalgal carbon limit our capacity to quantify rates of macroalgal carbon sequestration. Understanding the degradation dynamics of macroalgal-derived biomaterials-including tissue/wrack, particulate organic matter/carbon (POM/POC), and dissolved organic carbon (DOC)-as well as the environmental drivers of decomposition are critical for assessing the longevity of macroalgal carbon and the potential storage capacity of macroalgae. Thus, a systematic literature review of macroalgal degradation studies was conducted to compile data, estimate the relative recalcitrance (i.e., relative stability) of macroalgal biomaterials, and elucidate key drivers of macroalgal decomposition dynamics. We found that macroalgal decay trajectories are highly variable and not always best described by the often-cited exponential decay models. Our analysis demonstrated that temperature was a notable driver of decomposition, with higher temperatures eliciting faster rates of decomposition. Furthermore, we found that brown algae had significantly higher proportions of recalcitrant biomaterials when compared to red algae. The impact of other factors, including biomaterial type, degradation environment, and tissue carbon and nitrogen content on macroalgal degradation, is variable across contexts, warranting further study. These results help to provide a foundation from which to plan and assess future studies on macroalgal degradation, which will improve our understanding of how macroalgae contribute to marine carbon cycles, trophic subsidies, and, potentially, marine carbon sequestration.

海洋大藻降解的系统综述:为了更好地了解大藻的碳固存潜力。
尽管巨藻在海洋固碳中的潜在作用正在获得认可,但与巨藻碳命运相关的关键知识差距限制了我们量化巨藻碳固碳率的能力。了解大藻衍生生物材料(包括组织/残骸、颗粒有机物质/碳(POM/POC)和溶解有机碳(DOC))的降解动力学,以及分解的环境驱动因素,对于评估大藻碳的寿命和潜在的储存能力至关重要。因此,本文对大藻降解研究进行了系统的文献综述,以收集数据,估计大藻生物材料的相对抗逆性(即相对稳定性),并阐明大藻分解动力学的关键驱动因素。我们发现大藻的衰变轨迹是高度可变的,并不总是被经常引用的指数衰变模型所最好地描述。我们的分析表明,温度是分解的显著驱动因素,温度越高,分解速度越快。此外,我们发现与红藻相比,褐藻具有显著更高比例的顽固性生物材料。其他因素,包括生物材料类型、降解环境和组织碳氮含量对大藻降解的影响,在不同的环境下是不同的,需要进一步的研究。这些结果有助于为未来大型藻退化研究的规划和评估提供基础,这将提高我们对大型藻如何促进海洋碳循环、营养补贴以及潜在的海洋碳封存的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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