Seasonal and spatial variation in species diversity, abundance, and element accumulation capacities of macroalgae in man
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Seasonal and spatial variation in species diversity, abundance, and element accumulation capacities of macroalgae in mangrove forests of Zhanjiang, China ZHANG Yubin1*, LI Yuan1, SHI Fei1, SUN Xingli1, LIN Guanghui2 1
Monitoring Center for Marine Resources and Environments, Guangdong Ocean University, Zhanjiang 524088, China 2 Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China Received 20 December 2012; accepted 19 July 2013 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2014
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 winter (14 species) > autumn (12 species). The species diversity of macroalgae was significantly more abundant in spring than in other seasons (Wilcoxon test, p winter (5 species) > autumn (2 species), and significantly higher species diversity of macroalgae was found in spring and summer than in winter and autumn (Wilcoxon test, p autumn, as did that of macroalgal biomass in the S. apetala assemblage. In the Fujian mangrove assemblages, the total number of macroalgal species were highest in spring and summer (Liu et al., 2001), while the total macroalgal biomass was highest in early summer and
ZHANG Yubin et al. Acta Oceanol. Sin., 2014
lowest in early winter (Lin et al., 1997). This parallels what we observed. A similar seasonal pattern in mangrove macroalgal biomass was elucidated in Hurghada and Safaga, Egypt by ElSharouny et al. (2001). Distinct summer peaks of macroalgal biomass were also reported in temperate South African mangroves, a finding that was attributed to increased nutrient availability, temperature, and light levels (Steinke and Naidoo, 1990). Furthermore, the higher number of macroalgal species was recorded by Nedumaran and Perumal (2009) in Pichavaram, South India during the pre-monsoon season owing to the favorable physico-chemical parameters. In contrast, the highest number of taxa was observed during the colder, drier months in the mangroves of Ilha do Cardoso, Brazil (Yokoya et al., 1999), coinciding with the highest means of high neap tides and contracted periods of continuous emersion (April to August). Yet another pattern was noted in the Estero Zacatecas mangroves in Mexico (Pérez-Estrada et al., 2012): the seasonal species diversity varied relative to substrata (pneumatophores, aerial roots, and tidal channel bottoms), while the highest macroalgal biomass was recorded in November of the observation year due to effects from a hurricane. Surprisingly, no seasonal variation in macroalga
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