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| Species Composition and Primary Productivity of Microphytobenthos in Intertidal Zone of Yalu River Estuary in Spring |
| LI Ai, SONG Guangjun, TIAN Jin, WANG Kun, LIU Yan, WU Jinhao |
| Key Laboratory of Protection and Utilization of Aquatic Germplasm Resource, Ministry of Agriculture and Rural Affairs, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China |
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Abstract In order to explore the contribution of benthic microalgae in the intertidal zone of the Yalu River Estuary to the potential shellfish productivity in the tidal mudflat, species composition, abundance, biomass (as characterized by chlorophyll a content), demagnesium chlorophyll a content, and primary productivity were surveyed in the intertidal zone of the Yalu River Estuary on March 7—9, 2023 by microscopic technique and chlorophyll fluorescence technique. The results showed that two phyla(Bacillariophyceae and Chrysophyta)were identified including 29 genera and 64 species, with main group of Bacillariophyceae, and the dominant species of Nitzschia longssima and Navicula sp.. There was the average microphytobenthos number of 4.01×103 cells/cm2, with gradual decrease in both chlorophyll a and phaeophytin a with the increase in mudflat sediments, and several observed leaps in the vertical distribution of chlorophyll a in B1, B3, C2 and C3 stations, which might reflect the effects of bioturbation. There was mean concentrations of 0.59 μg/g for chlorophyll a and 0.93 μg/g for phaeophytin a in the top centimeter of sediment (0—1 cm). The descending order of species composition, abundance, and surface biomass distribution trends of microphytobenthos were expressed as 0.5 km>0.1 km>1.0 km offshore in horizontal distribution, which might be closely associated with photoperiod and sediment types of tidal areas in different offshore distances. The average primary productivity of microphytobenthos was estimated to be 16.7 g/(m2·h), and the annual productivity of shellfish to be 9.8×104 tons in the intertidal zone of the Yalu River Estuary, indicating that the natural food types and quantities provided by the intertidal zone of the Yalu River Estuary were suitable for the cultivation of shellfish in spring.
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Received: 14 August 2023
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