AI Article Synopsis
- Understanding the diversity and abundance of phytoplankton is critical for predicting ecosystem shifts.
- The study in the Pearl River Estuary utilized genetic and pigment analysis and found that while 18S rRNA levels poorly correlated with total chlorophyll, certain ratios showed potential as indicators of phytoplankton health.
- Findings indicate that 18S-based community structures were more aligned with pigment data compared to 16S, suggesting that different methodologies need to be integrated for accurate assessments of phytoplankton diversity and composition in ecosystems.
Article Abstract
Unlabelled: Understanding consistencies and discrepancies in characterizing diversity and quantity of phytoplankton is essential for better modeling ecosystem change. In this study, eukaryotic phytoplankton in the Pearl River Estuary, South China Sea were investigated using nuclear 18S rRNA and plastid 16S or 23S rRNA genes and pigment analysis. It was found that 18S abundance poorly explained the variations in total chlorophyll (Chl-). However, the ratios of log-transformed 18S abundance to Chl- in the major phytoplankton groups were generally environment dependent, suggesting that the ratio has potential as an indicator of the physiological state of phytoplankton. The richness of 18S-based operational taxonomic units was positively correlated with the richness of 16S-based amplicon sequence variants of the whole phytoplankton community, but insignificant or weak for individual phytoplankton groups. Overall, the 18S based, rather than the 16S based, community structure had a greater similarity to pigment-based estimations. Relative to the pigment data, the proportion of haptophytes in the 18S dataset, and diatoms and cryptophytes in the 16S dataset, were underestimated. This study highlights that 18S metabarcoding tends to reflect biomass-based community organization of eukaryotic phytoplankton. Because there were lower copy numbers of plastid 16S than 18S per genome, metabarcoding of 16S probably approximates cell abundance-based community organization. Changes in biomass organization of the pigment-based community were sensitive to environmental changes. Taken together, multiple methodologies are recommended to be applied to more accurately profile the diversity and community composition of phytoplankton in natural ecosystems.
Supplementary Information: The online version contains supplementary material available at 10.1007/s42995-023-00186-x.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10449762 | PMC |
| http://dx.doi.org/10.1007/s42995-023-00186-x | DOI Listing |
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