Combined effect of burrowing mangrove crabs and tides on carbon fluxes

IF 1 4区地球科学 Q3 MARINE & FRESHWATER BIOLOGY

Bulletin of Marine Science Pub Date : 2024-05-17 DOI:10.5343/bms.2024.0012

Moritz Klaassen, Nils Moosdorf, Martin Zimmer

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引用次数: 5

Abstract

Sesarmid crabs act as mangrove ecosystem engineers due to their burrowing behavior in the sediment. The burial of leaves inside the sediment suggests a positive relationship between crab activity and carbon storage in mangrove forests. However, crab burrows increase the sediment-air interface and, thus, might amplify CO 2 fluxes from the sediment. Additionally, the tidal export of carbon from burrows acting as preferential flow paths may offset the enhancing effect of crab burrows on carbon storage. In this study, we investigated the interactive effect of burrowing crabs and tidal flows on mangrove carbon storage in a laboratory experiment. Significantly higher dissolved organic carbon (DOC) concentrations in the porewater were found in microtidal compared to mesotidal treatments, while the total amount of outflowing DOC was similar across tidal treatments. No significant effect of burrowing crabs on the DOC content of the porewater was found. Significantly lower CO 2 fluxes into the atmosphere were found in treatments with crabs present which is contrary to previous studies. We suggest that lower CO 2 flux values were a result of collapsed burrows that preserved the particulate organic carbon (POC) in deeper sediment layers. Previous studies, showing enhanced CO 2 fluxes from crab burrows, have been carried out in the field and did not take the potential of burrow collapse into account. We stress the importance of considering temporal variability in crab burrow stability and spatial variability in tidal dynamics when evaluating their interactive effect on carbon fluxes in mangrove forests.

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穴居红树林蟹类与潮汐对碳通量的共同影响

芝麻蟹因其在沉积物中的穴居行为而扮演红树林生态系统工程师的角色。树叶在沉积物中的埋藏表明，红树林中螃蟹活动与碳储量之间存在正相关关系。然而，螃蟹的洞穴增加了沉积物-空气界面，因此可能会增加沉积物的二氧化碳通量。此外，螃蟹洞穴作为优先通道的碳潮汐输出可能抵消了螃蟹洞穴对碳储量的增强作用。本研究通过室内实验研究了穴居蟹和潮汐对红树林碳储量的交互作用。微潮处理的孔隙水中溶解有机碳（DOC）含量显著高于中潮处理，而不同潮处理的DOC总量相近。穴居蟹对孔隙水中DOC含量无显著影响。在有螃蟹存在的处理中，发现进入大气的二氧化碳通量显著降低，这与以前的研究相反。我们认为，较低的CO 2通量值是由于塌陷的洞穴在较深的沉积层中保存了颗粒有机碳（POC）。以前的研究表明，螃蟹洞穴的二氧化碳通量增加，但这些研究都是在野外进行的，没有考虑到洞穴坍塌的可能性。在评价蟹洞稳定性的时间变异性和潮汐动力学的空间变异性对红树林碳通量的相互作用时，我们强调考虑它们的重要性。

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

Bulletin of Marine Science 地学-海洋学

CiteScore

2.90

自引率

6.70%

发文量

审稿时长

6-12 weeks

期刊介绍： The Bulletin of Marine Science is a hybrid open access journal dedicated to the dissemination of research dealing with the waters of the world’s oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine policy, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, meteorology, and physical oceanography. In most regular issues the Bulletin features separate sections on new taxa, coral reefs, and novel research gear, instrument, device, or system with potential to advance marine research (“Research Tools in Marine Science”). Additionally, the Bulletin publishes informative stand-alone artwork with accompany text in its section "Portraits of Marine Science."