Response of a coastal Baltic Sea diatom-dominated phytoplankton community to experimental heat shock and changing salinity

Stefanidou, Natassa; Genitsaris, Savvas; Lopez-Bautista, Juan; Sommer, Ulrich; Moustaka‐Gouni, Maria

doi:10.1007/s00442-019-04502-0

Cited by 3 publications

(5 citation statements)

References 64 publications

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“…As shown in Table 1 , the Kruskal–Wallis test showed statistically significant seasonal variations ( p < 0.05) for all environmental factors. As a critical water environmental factor in seagoing rivers, SAL has often been of interest to researchers [ 11 , 21 , 29 ]. In this study, it ranged from 4.42 to 20.73 ppt in autumn, 3.62 to 29.57 ppt in winter, 1.61 to 5.18 ppt in spring, and 1.61 to 5.18 ppt in summer.…”

Section: Resultsmentioning

confidence: 99%

“…Species richness is an important index of the phytoplankton community that reflects and even determines the essential ecosystem functions [ 47 , 48 , 49 ], and is therefore widely studied in response to environmental impacts. A tendency for species richness to decrease with increasing salinity has been commonly reported, such as in the coastal Baltic Sea [ 21 ], in the Great Salt Lake, USA [ 20 ], and in the landscape water of Tianjin, China [ 12 ]. In this study, salinity also revealed a notable adverse effect on species richness, especially on Chlorophyta and Cyanophyta ( Figure 5 c).…”

Section: Discussionmentioning

confidence: 99%

“…However, the negative relationship was notable and significant at the annual scale (four quarters taken together). This indicated that some species’ disappearances could be attributed to their physiological intolerance to high temperature [ 21 ]. Another factor is that increased water temperature induced competitive exclusion [ 14 ], indirectly leading to a decreased number of species [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…Among the studies on the effects of abiotic factors on phytoplankton, temperature is one of the environmental factors that has received the most attention. At the global scale, temperature could influence phytoplankton growth rates and lead to phytoplankton diversity variations [ 18 ], while in microcosm experiments, increased temperature resulted in species loss, biomass decline, and abundance reduction [ 19 , 20 , 21 ]. In contrast, other studies have found positive or weak effects of temperature on phytoplankton [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies revealed that enhanced osmotic pressure induced by increasing salinity is a major cause of phytoplankton changes. For example, some freshwater species fail to overcome the physical constraints of increased osmotic pressure, or some species are outcompeted by species less affected by osmotic pressure [ 20 , 21 , 28 ]. It is generally considered that salinity is a limiting factor of phytoplankton in coastal areas [ 29 , 30 , 31 ] and high salinity lakes [ 11 , 20 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton Community Response to Environmental Factors along a Salinity Gradient in a Seagoing River, Tianjin, China

et al. 2022

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A river-estuary ecosystem usually features a distinct salinity gradient and a complex water environment, so it is enormously valuable to study the response mechanism of living organisms to multiple abiotic factors under salinity stress. Phytoplankton, as an important part of aquatic microorganisms, has always been of concern for its crucial place in the aquatic ecosystem. In this study, phytoplankton data and 18 abiotic factors collected from 15 stations in Duliujian River, a seagoing river, were investigated in different seasons. The results showed that the river studied was of a Cyanophyta-dominant type. Salinity (SAL) was the key control factor for phytoplankton species richness, while water temperature (WT) was critical not only for species richness, but also community diversity, and the abundance and biomass of dominant species. Apart from WT, the abundance and biomass of dominant species were also driven by total nitrogen (TN), nitrate (NO3−), pH, and water transparency (SD). Moreover, total dissolved phosphorus (TDP), pH, and chemical oxygen demand (COD) were crucial for community diversity and evenness. The bloom of dominant species positively associated with TDP led to lower diversity and evenness in autumn. In addition, when available nitrogen was limited, Pseudoanabaena sp. could obtain a competitive advantage through the N2 fixation function. Increased available nitrogen concentration could favor the abundance of Chlorella vulgaris to resist the negative effect of WT. The results show that Oscillatoria limosa could serve as an indicator of organic contamination, and nutrient-concentration control must be effective to inhibit Microcystis bloom. This could help managers to formulate conservation measures.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phytoplankton Community Response to Environmental Factors along a Salinity Gradient in a Seagoing River, Tianjin, China

et al. 2022

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Dissolved inorganic carbon determines the abundance of microbial primary producers and primary production in Tibetan Plateau lakes

Yue

Kong

et al. 2020

FEMS Microbiology Ecology

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Climate change globally accelerates the shrinkage of inland lakes, resulting in increases in both water salinity and dissolved inorganic carbon (DIC). The increases of salinity and DIC generate contrasting effects on microbial primary producers and primary production, however, their combined effects remain unclear in aquatic ecosystems. We hypothesized that increased DIC mitigates the constraints of enhanced salinity on microbial primary producers and primary production. To test this, we employed isotope labeling and molecular methods to explore primary production and four dominant types of microbial primary producers (form IA, IB, IC and ID) in lakes on the Tibetan Plateau. Results exhibited that DIC positively correlated with abundance of microbial primary producers and primary production (all P < 0.001) and offset salinity constraints. Structural equation models elucidated that DIC substantially enhanced primary production by stimulating the abundance of form ID microbial primary producers. The abundance of form ID primary producers explained more variations (14.6%) of primary production than form IAB (6%) and physicochemical factors (6.8%). Diatoms (form ID) played a determinant role in primary production in the lakes, by adapting to high DIC and high salinity. Our findings suggest that inland lakes may support higher primary productivity in future climate change scenarios.

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Air-dispersed aquatic microorganisms show establishment and growth preferences in different freshwater colonisation habitats

Genitsaris

Stefanidou

Be’eri-Shlevin

et al. 2021

FEMS Microbiology Ecology

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We attempted to mimic aeolian ecosystems to examine how filters posed by regional characteristics can influence the establishment and growth of airborne microcolonizers of a common air source. Using a natural single source of aerosols we applied a combined microscopy and high-throughput sequencing (HTS) approach to examine the diversity, settling and growth potential of air-dispersed microbes in water containers representing newly formed aquatic colonization habitats of different trophic state and salinity. Heterotrophic microeukaryotes were favoured as initial settlers when nutrients were low, while autotrophs rapidly proliferated in the high-nutrient containers, possibly due to favourable germinating conditions for their preferred mode of dispersal with resting spores. Following settling of colonizers, we investigated two contrasting hypotheses: If the different water colonization habitats harboured the same microbial communities after establishment and growth periods, this would point towards a selection of best-fit cosmopolitan colonizers, regardless of habitat-specific characteristics. Alternatively, community dissimilarities after the growth period would suggest a selection of settlers due to bottom-up controls combined with priority effects. Both analyses suggested that the structure of the microbial communities in the different colonization habitats were driven by nutrient content and salinity, showing clustering to similar bottom-up forces, and dissimilarities in significantly different colonization habitats.

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Response of a coastal Baltic Sea diatom-dominated phytoplankton community to experimental heat shock and changing salinity

Cited by 3 publications

References 64 publications

Phytoplankton Community Response to Environmental Factors along a Salinity Gradient in a Seagoing River, Tianjin, China

Phytoplankton Community Response to Environmental Factors along a Salinity Gradient in a Seagoing River, Tianjin, China

Dissolved inorganic carbon determines the abundance of microbial primary producers and primary production in Tibetan Plateau lakes

Air-dispersed aquatic microorganisms show establishment and growth preferences in different freshwater colonisation habitats

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