Spatial and temporal trends in order richness of marine phytoplankton as a tracer for the exchange zone between coastal and open waters

Jung, A.S.; Bijkerk, Ronald; Veer, Henk W. van der; Philippart, C.J.M.

doi:10.1017/s0025315416001326

Cited by 5 publications

(5 citation statements)

References 65 publications

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“…Average richness per sample was 37 ASVs, comparable to estimates observed in other coastal ecosystems (e.g., Ollison et al 2022). Diatom ASV richness changed with season, in alignment with previous work in coastal systems that showed significant seasonal shifts in richness attributed to local environmental conditions (Jung et al 2017; Gran‐Stadniczeñko et al 2019). Furthermore, ASV richness in NBay was not linearly correlated with changes in Chl a concentration, even during diatom blooms when the water column can be numerically dominated by one or two species (Karentz and Smayda 1984; Canesi and Rynearson 2016).…”

Section: Discussionsupporting

confidence: 87%

Multi‐year time series reveals temporally synchronous diatom communities with annual frequency of recurrence in a temperate estuary

Fontaine

Rynearson

2023

Limnology & Oceanography

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Diatoms are among the most abundant phytoplankton that inhabit coastal ecosystems, forming large blooms that fuel coastal food webs. Although diatoms are often large and morphologically distinct, many are small or morphologically cryptic making it difficult to understand the temporal dynamics of whole diatom communities and the environmental factors that drive them. Here, we investigated diatom diversity and its environmental correlates using 6 yr of monthly surface water samples from the Narragansett Bay Plankton Time Series to investigate the seasonal and annual variability of diatom species occurrence. High‐throughput amplicon sequencing of filtered biomass yielded 658 diatom amplicon sequence variants (ASVs), of which 347 were identified to species. Of the 49 diatom genera in the sequencing dataset, 33% had never been observed in the time series using microscopy (1959–2014). We observed a weak quadratic relationship between ASV richness and chlorophyll‐a concentrations, suggesting that richness decreases during blooms. There was a significant difference in diatom ASV richness by season and we identified distinct assemblages associated with different seasons. These assemblages were remarkably synchronous, exhibiting a sinewave‐like pattern, over 6 yr with an annual periodicity that correlated significantly with seasonal changes in temperature, light, and dissolved inorganic nitrogen. The annual cycle of diatom assemblages suggests stability in a key component of the estuarine food web known to influence ecosystem resilience and function. Deviations from the annual cycle of recurrence could be used to distinguish between changes in community structure driven by annual fluctuations in the environment and those driven by climate‐change stressors.

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Section: Discussionsupporting

confidence: 87%

Multi‐year time series reveals temporally synchronous diatom communities with annual frequency of recurrence in a temperate estuary

Fontaine

Rynearson

2023

Limnology & Oceanography

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“…from Lake IJssel, receiving water from the river Rhine, and from the coastal waters of the North Sea connected to the tidal basins via tidal inlets between the barrier islands (Duran-Matute et al, 2014;Postma, 1950;Ridderinkhof et al, 1990). Field measurements and information from reflectance images retrieved by means of remote sensing suggest the presence of a coastal zone seaward of the barrier islands in which such an exchange of water, nutrients and organic matter between the Wadden Sea and the North Sea takes place (Jung et al, 2016;Postma, 1981;Postma, 1984;van Raaphorst et al, 1998;Visser et al, 1991).…”

Section: Highlightsmentioning

confidence: 99%

Long-term trends in nutrient budgets of the western Dutch Wadden Sea (1976–2012)

Jung

Brinkman²,

Folmer

et al. 2017

Journal of Sea Research

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Long-term field observations of nitrogen [N] and phosphorus [P] concentrations were used to construct nutrient budgets for the western Dutch Wadden Sea between 1976 and 2012. Nutrients come into the western Dutch Wadden Sea via river runoff, through exchange with the coastal zone of the North Sea, neighbouring tidal basins and through atmospheric deposition (for N). The highest concentrations in phosphorus and nitrogen were observed in the mid-1980s. Improved phosphorus removal at waste water treatment plants, management of fertilization in agriculture and removal of phosphates from detergents led to reduced riverine nutrient inputs and, consequently, reduced nutrient concentrations in the Wadden Sea. The budgets suggest that the period of the initial net import of phosphorus and nitrogen switched to a net export in 1981 for nitrogen and in 1992 for phosphorus. Such different behaviour in nutrient budgets during the rise and fall of external nutrient concentrations may be the result of different sediment-water exchange dynamics for P and N. It is hypothesized that during the period of increasing eutrophication (1976-1981) P, and to a lesser degree N, were stored in sediments as organic and inorganic nutrients. In the following period (1981-1992) external nutrient concentrations (especially in the North Sea) decreased, but P concentrations in the Wadden Sea remained high due to prolonged sediment release, while denitrification removed substantial amounts of N.

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“…We conclude that this i-trait could represent adaptation to different water basin conditions (nutrient availability and salinity), which are different for the Wadden Sea and the Southern part of the North Sea (van Beusekom et al, 1999;van Beusekom and de Jonge, 2002). Such interpretation is likely, as it is being considered in the scientific literature (Carstensen et al, 2015;Jung et al, 2017).…”

Section: Successful Aggregation Of Phytoplankton Datasetsmentioning

confidence: 80%

“…Significant declining estimations of functional diversity in the West Wadden Sea are in line with recent reports (Wolff et al, 2010;van Beusekom et al, 2019;Jacobs et al, 2020) and showed the ever prevalence of fastgrowing nutrient opportunist phytoplankton species in this ecosystem. Additionally, the difference in the functional diversity trends of the Southern North Sea stations might be explained by the existence of a 'line-of-no-return' off the sand barrier islands of the Wadden Sea (Postma, 1984;Jung et al, 2017), which might isolate off-shore stations and their phytoplanktonic community.…”

Section: Discussionmentioning

confidence: 99%

“…A possible explanation for this is the existence of a 'line-of-no-return' off the sand barrier islands of the Wadden Sea (Postma, 1984), which decreases the exchange between water masses and increases the accumulation of suspended matter in the coastal zone (de Jong and de Jong, 2002). Jung et al (2017) recently estimated this line somewhere between 10 and 100 km at the Terschelling transect, thus having stations inside the 'line-of-no-return' highly influenced by the Wadden Sea dynamics and its environmental conditions. Therefore, the negative trend in functional diversity observed in the in-shore stations, as well as in the ROTTMP transect stations,…”

Section: Functional Diversity Status Of Southern North Sea and Wadden...mentioning

confidence: 99%

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Aggregation of monitoring datasets for functional diversity estimation

Carrasco De La Cruz,

Antonucci Di Carvalho,

Massing

et al. 2023

Front. Ecol. Evol.

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Long-term monitoring data is central for the analysis of biodiversity change and its drivers. Time series allow a more accurate evaluation of diversity indices, trait identification and community turnover. However, evaluating data collected across different monitoring programs remains complicated because of data discrepancies and inconsistencies. Here we propose a method for aggregating datasets using diffusion maps. The method is illustrated by aggregating long-term phytoplankton abundance data from the Wadden Sea and Southern North Sea gathered by two institutions located in Germany and The Netherlands. The aggregated data allowed us to infer species traits, to reconstruct the main trait axis which drives community functionality, ultimately quantifying functional diversity of the individual samples, having used only the co-occurrence of species in samples. Although functional diversity varies greatly among sampling stations, we detect a slight positive trend in German stations, which contrasts with the clear decreasing trend observed in most of the Dutch Wadden Sea stations. At the Terschelling transect, in Southern North Sea, the stations also showed contrasting estimations of functional diversity between off-shore and in-shore stations. Our research provides further evidence that traits and functional diversity can be robustly reconstructed from monitoring data alone, showing that data aggregation can increase the accuracy of this reconstruction, being able to aggregate heterogeneous datasets.

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Spatial and temporal trends in order richness of marine phytoplankton as a tracer for the exchange zone between coastal and open waters

Abstract: (2017). Spatial and temporal trends in order richness of marine phytoplankton as a tracer for the exchange zone between coastal and open waters.

Cited by 5 publications

References 65 publications

Multi‐year time series reveals temporally synchronous diatom communities with annual frequency of recurrence in a temperate estuary

Multi‐year time series reveals temporally synchronous diatom communities with annual frequency of recurrence in a temperate estuary

Long-term trends in nutrient budgets of the western Dutch Wadden Sea (1976–2012)

Aggregation of monitoring datasets for functional diversity estimation

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