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Int J Environ Res Public Health
2022 Jun 24;1913:. doi: 10.3390/ijerph19137788.
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Phytoplankton Communities and Their Relationship with Environmental Factors in the Waters around Macau.
He R
,
Luo H
,
He N
,
Chen W
,
Yang F
,
Huang W
,
Li N
,
Sun L
,
Peng S
.
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An investigation of the waters around Macau collected 43 phytoplankton species belonging to 29 genera and 5 phyla, including 32 species from 22 genera of Bacillariophyta, 7 species from 3 genera of Pyrrophyta, 2 species from 2 genera of Cyanophyta, and 1 genus and 1 species from both Euglenophyta and Chromophyta. The dominant phytoplankton species in the study areas were Skeletonema costatum (Greville) Cleve, Aulacoseira granulata (Ehrenberg) Simonsen, Thalassiothrix frauenfeidii Grunow, and Thalassionema nitzschioides Grunow. The phytoplankton abundance in the waters around Macau was between 46,607.14 and 1,355,000 cells/m3, with the highest abundance noted in station S8. Diatoms were the main contributor to phytoplankton abundance in station S8, accounting for 96.2% of the total abundance. Station S4 exhibited the lowest phytoplankton abundance of 46,607.1 cells/m3, with diatoms and Chromophytaaccounting for 58.6% and 29.9% of the total phytoplankton abundance, respectively. Biodiversity analysis results showed that the phytoplankton richness index was 1.18-3.61, the uniformity index was 0.24-0.78, and the Shannon-Wiener index was 0.94-3.41. Correlation analysis revealed that ammonia nitrogen was significantly negatively correlated with the phytoplankton richness, uniformity, and Shannon-Wiener indices. Nitrite nitrogen, nitrate nitrogen, inorganic nitrogen, salinity, turbidity, and pH were positively correlated with the phytoplankton evenness index and Shannon-Wiener index. Cluster and non-metric multidimensional scaling analyses demonstrated that the phytoplankton community structure in the waters around Macau could be divided into three groups, with A. granulata, S. costatum, T. frauenfeidii, T. nitzschioides, Chaetoceros curvisetus Cleve, and Chaetoceros diadema (Ehrenberg) Gran being predominant in different grouping communities (contribution% > 10%). Biota-Environment Stepwise Analysis (BIOENV) showed a significant correlation between the phytoplankton community and nitrite nitrogen content in the waters around Macau (correlation: 0.5544, Mantel test: statistic 0.4196, p = 0.009), which was consistent with the results of the canonical correspondence analysis.
Figure 2. Phytoplankton species composition in the waters around Macau.
Figure 3. Phytoplankton species of different taxa detected in the different sampling sites.
Figure 4. The spatial distribution of abundance (cell/m3) of phytoplankton dominant species in waters around Macau.
Figure 5. Cluster and NMDS analysis of phytoplankton structure in the waters around Macau examined in December 2019. (a) Cluster analysis of Bray-Curtis similarity indices of different sampling sites. (b) NMDS based on the Bray-Curtis similarity ordination (2D stress = 0.06). Ellipses around the clusters indicate the standard deviation of point scores based on sample-group clusters.
Figure 6. CCA of the relationship between environmental parameters and phytoplankton species abundance in the waters around Macau examined in December 2019.
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