Seasonal and spatial variation in species diversity, abundance, and element accumulation capacities of macroalgae in mangrove forests of Zhanjiang, China |
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| Authors: | ZHANG Yubin LI Yuan SHI Fei SUN Xingli and LIN Guanghui |
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| Institution: | 1.Monitoring Center for Marine Resources and Environments, Guangdong Ocean University, Zhanjiang 524088, China2.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China |
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| Abstract: | The objective of this study was to investigate whether there was distinctive seasonal and zonal variation in the species diversity, biomass, and element accumulation capacities of macroalgae in two major intertidal mangrove stand types (Avicennia marina assemblage and Sonneratia apetala assemblage) in the Zhanjiang region of southern China. Over a year, 31 species in 15 genera were identified in both mangrove assemblages, of which the dominant species were Cladophoropsis zollingeri and Enteromorpha clathrat. Macroalgal species were significantly most abundant in spring (p<0.05), followed by summer, winter, and autumn. Variation in the zonal distribution of macroalgal species was conspicuous in both intertidal mangrove assemblages, with the greatest abundance in the middle zone, and the least in the front zone. Patterns in the seasonal and zonal variation in macroalgal biomass in the S. apetala assemblage were similar to those of macroalgal species diversity in both mangrove assemblages. The seasonal patterns in tissue concentrations of 15 analyzed elements were not uniform among the macroalgae C. zollingeri, E. clathrata, and Gracilaria salicornia in the A. marina assemblage. All three species exhibited variation in their responses to ambient concentrations of different elements, implying their differential ability to absorb and selectively accumulate certain elements. |
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| Keywords: | mangrove macroalgae seasonal variation intertidal biomass element concentration |
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