Lim Joon Hai, Lee Choon Weng
Laboratory of Microbial Ecology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Institute of Ocean and Earth Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Environ Monit Assess. 2017 Aug 3;189(9):432. doi: 10.1007/s10661-017-6147-4.
Diatom abundance, biovolume and diversity were measured over a 2-year period along the Straits of Malacca at two stations with upper (Klang) and lower (Port Dickson) states of eutrophication. Diatom abundance, which ranged from 0.2 × 10 to 21.7 × 10 cells L at Klang and 0.9 × 10- 41.3 × 10 cells L at Port Dickson, was influenced partly by nutrient concentrations. At Klang, the diatoms were generally smaller and less diverse (H' = 0.77 ± 0.48) and predominated by Skeletonema spp. (60 ± 32% of total diatom biomass). In contrast, diatoms were larger and more diverse (H' = 1.40 ± 0.67) at Port Dickson. Chaetoceros spp. were the most abundant diatoms at Port Dickson but attributed only 48 ± 30% of total diatom biomass. Comparison of both Klang and Port Dickson showed that their diatom community structure differed and that eutrophication reduced diatom diversity at Klang. We also observed how Si(OH) affected the abundance of Skeletonema spp. which in turn influenced the temporal variation of diatom community at Klang. Our results highlighted how eutrophication affects diatom diversity and community structure.
在两年时间里，对处于富营养化程度较高（巴生）和较低（波德申港）状态的马六甲海峡两个站点的硅藻丰度、生物体积和多样性进行了测量。硅藻丰度在巴生站点为0.2×10至21.7×10个细胞/升，在波德申港站点为0.9×10至41.3×10个细胞/升，部分受营养物浓度影响。在巴生，硅藻通常较小且多样性较低（香农指数H' = 0.77±0.48），以骨条藻属为主（占硅藻总生物量的60±32%）。相比之下，波德申港的硅藻更大且多样性更高（香农指数H' = 1.40±0.67）。角毛藻属是波德申港最丰富的硅藻，但仅占硅藻总生物量的48±30%。对巴生和波德申港的比较表明，它们的硅藻群落结构不同，富营养化降低了巴生的硅藻多样性。我们还观察了硅酸如何影响骨条藻属的丰度，进而影响巴生硅藻群落的时间变化。我们的结果突出了富营养化如何影响硅藻多样性和群落结构。
