Monitoring van het visbestand in het Zeeschelde-estuarium.: Viscampagnes 2017

Breine, Jan; Bruyn, Adinda De; Galle, Linde; Lambeens, Isabel; Maes, Yves; Thuyne, Gerlinde Van

doi:10.21436/inbor.14245903

Cited by 1 publication

(3 citation statements)

References 5 publications

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“…Figure 11 shows the long-term trends resulting from the OMES observations in spring. The fish abundance follows from visual inspection of the figures showing the fish abundance in spring presented in Breine et al (2018). The grazing efficiency is the grazing efficiency corresponding to calanoids [which dominate the brackish region (km 60-90) in spring] and follows from the calibration of g 1 carried out in Section 3.2.2.…”

Section: Hypothesized Schematic Reconstruction Of the Estuary-scale Cmentioning

confidence: 99%

“…11). Zooplankton was abundant in the brackish region because the fish population was low (Breine et al, 2018). Zooplankton was limited to the brackish region because the oxygen concentrations in the freshwater region were too low (< 4 mg L −1 ) to allow for the occurrence of the dominant calanoid species Eurytemora affinis (Appeltans, 2003;Mialet et al, 2010Mialet et al, , 2011.…”

Section: Hypothesized Schematic Reconstruction Of the Estuary-scale Cmentioning

confidence: 99%

“…In particular, the oxygen levels significantly increased and did not show critical concentrations for fish abundance below 2.5 mg L −1 (see O 2 in Fig. 11), resulting in a significant increase in estuarine fish population in spring after 2007 (Breine et al, 2018) (see fish in Fig. 11).…”

Section: Hypothesized Schematic Reconstruction Of the Estuary-scale Cmentioning

confidence: 99%

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Evolution of the long-term and estuary-scale phytoplankton patterns in the Scheldt estuary: the disappearance of net growth in the brackish region

Horemans

Dijkstra

Tackx

et al. 2021

Preprint

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Abstract. Estuaries often show regions in which Chlorophyll-a (Chl-a) accumulates. The location and magnitude corresponding to such accumulation result from a complex interplay between processes such as river flushing, salinity, nutrients, phytoplankton grazing, and the light climate in the water column. Of particular interest is the long-term evolution of the estuary-scale Chl-a distribution in the Scheldt estuary (Belgium/Netherlands) in spring. From 2004–2007, we observed a limited spring-bloom in the brackish region. This bloom intensified in 2008–2014 and disappeared after 2015. This long-term evolution in Chl-a has been linked to simultaneous long-term trends in the suspended particulate matter (SPM) distribution and the improvement of the water quality, which affects grazing of Chl-a by zooplankton. However, this hypothesis has not been systematically investigated. In this paper, we apply two approaches to test this hypothesis. In the first approach, we analyze long-term in situ observations covering the full estuary. These observations include the SPM concentration, zooplankton abundance, and other variables affecting the Chl-a concentration, and show a long-term estuary-scale evolution in not only the SPM distribution but also in zooplankton abundance, freshwater discharge, and maximum photosynthetic rate. In the second approach, we apply a model approach supported by these observations to determine which of the changed conditions may explain the observed change in Chl-a. Our results suggest that a change in SPM alone cannot explain the Chl-a observations. Instead, mortality rate and grazing by zooplankton mainly explains the long-term estuary-scale evolution of Chl-a in spring. Our results highlight that insight into the zooplankton dynamics is essential to understand the phytoplankton (cf. Chl-a) dynamics in the Scheldt estuary.

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Section: Hypothesized Schematic Reconstruction Of the Estuary-scale Cmentioning

confidence: 99%

Section: Hypothesized Schematic Reconstruction Of the Estuary-scale Cmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of the long-term and estuary-scale phytoplankton patterns in the Scheldt estuary: the disappearance of net growth in the brackish region

Horemans

Dijkstra

Tackx

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

Monitoring van het visbestand in het Zeeschelde-estuarium.: Viscampagnes 2017

Cited by 1 publication

References 5 publications

Evolution of the long-term and estuary-scale phytoplankton patterns in the Scheldt estuary: the disappearance of net growth in the brackish region

Evolution of the long-term and estuary-scale phytoplankton patterns in the Scheldt estuary: the disappearance of net growth in the brackish region

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