Benthic Microalgal Community Structure, Primary Productivity, and Fiddler Crab (Leptuca pugilator) Grazing in an Estuarine Salt Panne
Benthic Microalgal Community Structure, Primary Productivity, and Fiddler Crab (Leptuca pugilator) Grazing in an Estuarine Salt Panne
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DOI：
10.1007/s12237-023-01208-8
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发表时间：
2023-04
影响因子：
2.7
通讯作者：
J. Pinckney
中科院分区：
文献类型：
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作者：
J. Pinckney
盐沼是潮上带的沼泽特征，缺乏大型植物植被。虽然这些生境看起来贫瘠，但底栖微藻（BMA）栖息在沉积物中，是潜在的重要初级生产者。此外，盐池是沙招潮蟹（Leptuca pugilator; Bosc）密集聚集的栖息地。本研究的目的是确定的时间变化BMA生物量，群落组成，和净初级生产力（NPP）的潮上盐panne和量化砂招潮蟹放牧BMA。通过测量未放牧和放牧沉积物中的氯含量，确定了螃蟹放牧对表层沉积物中BMA丰度的影响。BMA生物量在6月和7月达到16 µg炉渣沉积物的峰值，这表明在春季增长，然后在温暖的夏季略有下降。BMA群落主要由底栖硅藻组成，蓝藻数量较少。7月，净初级生产力上升至中位数0.51 mmol O2 m − 2 h −1（6.12 mg Cm − 2 h −1）。与河口其他BMA生境相比，盐沼的NPP和生物量均低于其他5种生境类型（高、矮米草、潮间泥滩、浮游植物和沉水沉积物）。砂招潮蟹似乎没有消耗大量的BMA在盐pannes放牧。这是有史以来第一次对BMA NPP的研究表明，河口盐池可能是生态系统NPP的一个小贡献者。
Salt pannes are marsh features in the supratidal zone that are devoid of macrophytic vegetation. Although these habitats appear barren, benthic microalgae (BMA) inhabit the sediments and are potentially important primary producers. In addition, salt pannes are habitats for dense accumulations of sand fiddler crabs (Leptuca pugilator; Bosc ). The purpose of this study was to determine the temporal changes in BMA biomass, community composition, and net primary productivity (NPP) for a supratidal salt panne and quantify sand fiddler crab grazing on BMA. The impact of crab grazing on BMA abundance in surface sediments was determined by measuring chlaconcentrations in ungrazed and grazed sediments. BMA biomass peaked to a high of 16 µg chlag sediment−1in June and July, suggesting growth in the spring followed by a small decline in the warmer summer months. The BMA community was primarily composed of benthic diatoms, with lesser amounts of cyanobacteria. NPP increased to a median of 0.51 mmol O2m−2h−1(6.12 mg C m−2h−1) in July. In comparison with other BMA habitats in this estuary, NPP and biomass for salt pannes was lower than the other 5 habitat types (tall and shortSpartina, intertidal mud and sandflats, phytoplankton, and submerged sediments). Sand fiddler crabs do not appear to consume significant amounts of BMA during grazing in salt pannes. This first ever study of BMA NPP demonstrates that estuarine salt pannes are likely a small contributor to ecosystem NPP.