Phytoplankton diversity and photosynthetic acclimation along a longitudinal transect through a shallow estuary in summer

Schoor, Arne; Selig, Uwe; Geiss-Brunschweiger, Ulrike; Schaible, Ralf; Schumann, Rhena; Schubert, Bianca; Feuerpfeil, Peter; Hagemann, Martin; Schubert, Hendrik

doi:10.3354/meps07452

Cited by 5 publications

(4 citation statements)

References 58 publications

(58 reference statements)

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“…Our study found high correlations between phytoplankton diversity indices and environmental variables of nutrients and nutrient ratios in the Jiulong River estuary, indicating that nutrients and nutrient ratios contributed significantly to phytoplankton biodiversity patterns, which is in agreement with findings from previous studies conducted in similar estuarine environments (Schoor et al, 2008;Li et al, 2010;Huang et al, 2013;Chu et al, 2014;Zhang et al, 2015;Anselme et al, 2018). The relative contribution was quantified by calculating the percentage of the absolute coefficient value of all relevant variables that yielded a statistically significant value (p < 0.001) from optimal regression equations (see Figures 9, 10).…”

Section: Roles Of Nutrients and Nutrient Ratios In Shaping Phytoplank...supporting

confidence: 92%

“…Previous studies conducted on nutrient ratios primarily focused on N:P and Si:P (Schoor et al, 2008;Li et al, 2010;Huang et al, 2013;Chu et al, 2014;Zhang et al, 2015), while relatively few focused on Si:N (Li et al, 2010;Chu et al, 2014). Justić et al (1995) proposed that P limitation could potentially occur under conditions where Si:P > 22 and N:P > 22, N limitation could potentially occur under conditions where N:P < 10 and N:Si < 1, and Si limitation could potentially occur under conditions where Si:P < 10 and N:Si > 1.…”

Section: Roles Of Nutrients and Nutrient Ratios In Shaping Phytoplank...mentioning

confidence: 99%

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Phytoplankton Species Diversity Patterns and Associated Driving Factors in China’s Jiulong River Estuary: Roles That Nutrients and Nutrient Ratios Play

Chen

et al. 2022

Front. Mar. Sci.

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Understanding diversity patterns and associated driving factors are the critical topics in macroecology and conservation biology. Phytoplankton are highly susceptible to environmental changes in estuaries, particularly eutrophication. This study examined phytoplankton alpha and beta diversity using investigation data in May (springtime), August (summer) and November (autumn) 2009 in China’s Jiulong River estuary, where it was easily polluted because of considerable discharge from a highly dense human population and low self-purification capacity with its limited river basin area, potentially resulting in eutrophication and then influencing phytoplankton diversity. Potential influencing factors were also explored, including dissolved oxygen, salinity, nutrients, nutrient ratios, geographic and hydrologic distance, and so on. The results indicated that Shannon’s index (H’) and Pielou’s index (J) decreased from the estuary’s upper to middle and then increased from middle to lower reaches, Simpson’s (D) observed the opposite trend and species number (S) gradually increased from the estuary’s upper to lower reaches. For beta diversity, all the indices showed a gradual decrease trend from the estuary’s upper to lower reaches, where also, turnover dominated beta diversity for all seasons. It is noteworthy that the significant roles that nutrients and nutrient ratios played in shaping phytoplankton diversity patterns and the nutrient balance were characterized by excess nitrogen (N) and silicon (Si) and limited phosphorus (P), which could potentially cause diatom blooms. Findings also showed that decreasing Si concentrations can help to reduce overall pollution levels as well as the restoration of the estuary’s ecosystem better than just reducing N alone. Accordingly, this study advocates for the protection of the entire estuary system with particular emphasis on its upper reaches. Moreover, greater attention should also be paid to impacts associated with N input and nutrient ratio trade-offs to the prospective watershed management of this estuary. This study provides a practical approach to explore estuarine diversity in a comprehensive way, which can inform effective biodiversity conservation and also be applied to other marine ecosystems to better guide sustainable management and conservation practices.

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Section: Roles Of Nutrients and Nutrient Ratios In Shaping Phytoplank...supporting

confidence: 92%

Section: Roles Of Nutrients and Nutrient Ratios In Shaping Phytoplank...mentioning

confidence: 99%

Phytoplankton Species Diversity Patterns and Associated Driving Factors in China’s Jiulong River Estuary: Roles That Nutrients and Nutrient Ratios Play

Chen

et al. 2022

Front. Mar. Sci.

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“…The heterocytous and non-heterocytous filamentous strains were mostly isolated from samples taken in autumn. Filamentous cyanobacteria occurred with the highest biomasses in that season ( Schumann et al, 2001 ; Schoor et al, 2008 ). Only the very abundant non-heterocytous Planktolyngbya contorta could not be cultured.…”

Section: Resultsmentioning

confidence: 99%

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

2017

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Cyanobacteria are found worldwide in various habitats. Members of the picocyanobacteria genera Synechococcus and Prochlorococcus dominate in oligotrophic ocean waters. Other picocyanobacteria dominate in eutrophic fresh or brackish waters. Usually, these are morphologically determined as species of the order Chroococcales/clade B2. The phytoplankton of a shallow, eutrophic brackish lagoon was investigated. Phytoplankton was dominated by Aphanothece-like morphospecies year-round for more than 20 years, along a trophy and salinity gradient. A biphasic approach using a culture-independent and a culture-dependent analysis was applied to identify the dominant species genetically. The 16S rRNA gene phylogeny of clone sequences and isolates indicated the dominance of Cyanobium species (order Synechococcales sensu Komárek/clade C1 sensu Shih). This difference between morphologically and genetically based species identifications has consequences for applying the Reynolds functional-groups system, and for validity long-term monitoring data. The literature shows the same pattern as our results: morphologically, Aphanothece-like species are abundant in eutrophic shallow lagoons, and genetically, Cyanobium is found in similar habitats. This discrepancy is found worldwide in the literature on fresh- and brackish-water habitats. Thus, most Aphanothece-like morphospecies may be, genetically, members of Cyanobium.

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“…The seasonal variations of environmental factors often result in changes of phytoplankton species composition, as each species has different requirements and characteristics (Flöder et al, 2002). Since growth and production of phytoplankton are closely related to photosynthesis, temperature and solar radiation are two of the key physical variables controlling algal populations in a particular season in highly eutrophic waters (Schoor et al, 2008). For example, it has been recently shown in a mesocosm study that while solar radiation has an important role in the initiation of the spring bloom, an increase in temperature may decrease the peak biomass, mean cell size and the share of diatoms in the phytoplankton community (Sommer & Lengfellner, 2008).…”

Section: Introductionmentioning

confidence: 99%

Plankton dynamics and photosynthesis responses in a eutrophic lake in Patagonia (Argentina): influence of grazer abundance and UVR

Gonçalves¹,

Villafañe²,

Medina

et al. 2011

Lat. Am. J. Aquat. Res.

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A natural plankton population from the eutrophic lake Cacique Chiquichano, in the Argentine Patagonia, was monitored for one year to evaluate changes in photosynthetic parameters as a result of exposure to ultraviolet radiation (UVR, 280-400 nm), grazer abundance, and the taxonomic composition of the phytoplankton community. Both physical (temperature, solar radiation) and biological (grazers, taxonomic composition, photosynthetic parameters) variables fluctuated throughout the study. Crustacean zooplankton showed alternating dominance between cladocerans (Daphnia spinulata) and copepods (Metacyclops mendocinus). The phytoplankton community underwent concomitant changes throughout the year, with cyanobacteria and diatoms alternately dominating. In addition, although copepod abundance was not significantly related to changes in phytoplankton, the presence of D. spinulata was significant during periods of more transparent water; these periods were dominated by diatoms. On the other hand, cyanobacteria dominated the phytoplankton assemblage when the penetration of solar radiation into the water column was lower. Photosynthetic inhibition due to UVR decreased during the diatom-dominated periods. In contrast, inhibition increased along with the proportion of cyanobacteria, likely as a result of acclimation to low irradiance during the lake’s phase of lower transparency. Moreover, the presence of D. spinulata was associated with the increased penetration of solar radiation into the water column, resulting in an indirect increment in the inhibition of cyanobacteria photosynthesis. The results suggest that both solar radiation and grazing abundance strongly influence the dynamics and photosynthetic activity of the phytoplankton in Lake Cacique Chiquichano.

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Phytoplankton diversity and photosynthetic acclimation along a longitudinal transect through a shallow estuary in summer

Cited by 5 publications

References 58 publications

Phytoplankton Species Diversity Patterns and Associated Driving Factors in China’s Jiulong River Estuary: Roles That Nutrients and Nutrient Ratios Play

Phytoplankton Species Diversity Patterns and Associated Driving Factors in China’s Jiulong River Estuary: Roles That Nutrients and Nutrient Ratios Play

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

Plankton dynamics and photosynthesis responses in a eutrophic lake in Patagonia (Argentina): influence of grazer abundance and UVR

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