scholarly journals Reef-building Pacific oysters record seasonal variations in water mass-properties of tidal basins from the Central Wadden Sea (North Sea)

2021 ◽  
pp. 110534
Author(s):  
Jassin Petersen ◽  
Jürgen Titschack ◽  
Jeroen Groeneveld ◽  
Achim Wehrmann ◽  
Dierk Hebbeln ◽  
...  
Keyword(s):  
North Sea ◽  
Seasonal Variations ◽  
Wadden Sea ◽  
Water Mass ◽  
Pacific Oysters ◽  
Tidal Basins ◽  
Mass Properties

Reef-building oysters record seasonal variations in water mass-properties of tidal basins from the Central Wadden Sea (North Sea)

2021 ◽  
Author(s):  
Jassin Petersen ◽  
Jürgen Titschack ◽  
Jeroen Groeneveld ◽  
Achim Wehrmann ◽  
Dierk Hebbeln ◽  
...  
Keyword(s):  
High Resolution ◽  
North Sea ◽  
Seasonal Changes ◽  
Wadden Sea ◽  
Water Mass ◽  
Ontogenetic Stage ◽  
Limiting Factors ◽  
Time Averaging ◽  
Tidal Basins ◽  
Mass Properties

<p>Before proxy records can be reliably employed in palaeoclimate research, calibration studies have to be conducted to assess the confidence intervals of the respective proxies. Here, we use shells of the fast growing Pacific oyster <em>Magallana gigas</em> from the Central Wadden Sea, North Sea, a temperate barrier island-backbarrier tidal flat-salt marsh system with large seasonal changes of water mass-properties, for the calibration of geochemical proxies. <em>M. gigas</em> represents a non-native invasive species that rapidly develops oyster reefs. Calcite shells of two specimens from the intertidal and subtidal zones were sampled in high resolution yielding sub-monthly data sets. The time period represented in the shell, based on δ<sup>18</sup>O age modelling, was estimated at 8-10 years and the growth of the shells was restricted from (late) spring to (early) autumn of each year. Mg/Ca, Mn/Ca and Sr/Ca ratios of the intertidal and subtidal specimens show similar seasonal patterns. Mg/Ca and Sr/Ca ratios are investigated as high-resolution sea surface temperature (SST) proxies. Important ontogenetic effects (i.e., increasing time-averaging with increasing age) as well as intra-species variability are discussed as limiting factors for the proxy development. Intertidal Mg/Ca ratios show only a significant correlation to the high-resolution SST record of the Central Wadden Sea when the early ontogenetic stage is considered. Sr/Ca ratios were comparable in terms of absolute values and amplitudes to those of <em>M. gigas</em> in the Northern Wadden Sea, but amplitudes were decreasing with increasing ontogeny. These findings seriously hamper the application of Mg/Ca and Sr/Ca for reliable palaeotemperature reconstructions regardless of ontogenetic stage. The Mn/Ca ratios were investigated as proxy for Mn cycling in tidal basins, where it is interrelated with seasonal changes in primary production. In addition to the generally observed seasonal variability of the Mn/Ca records, the subtidal Mn/Ca is significantly elevated compared to intertidal Mn/Ca. The subtidal Mn/Ca offset likely reflects differences in Mn cycling in tidal settings and could, therefore, serve in the palaeorecord as indicator to differentiate inter- and subtidal habitats in the same embedding sedimentary facies. This habitat effect has to be considered as an important factor besides environmental change when interpreting the high-resolution proxy record of fossil oysters.</p>

scholarly journals Heading northward to Scandinavia: Undaria pinnatifida in the northern Wadden Sea

2018 ◽  
Vol 61 (4) ◽  
pp. 365-371 ◽  
Author(s):  
Jessica Schiller ◽  
Dagmar Lackschewitz ◽  
Christian Buschbaum ◽  
Karsten Reise ◽  
Shaojun Pang ◽  
...  
Keyword(s):  
North Sea ◽  
Wadden Sea ◽  
Undaria Pinnatifida ◽  
Atlantic Coast ◽  
The North ◽  
Pacific Oysters ◽  
The North Sea ◽  
New Generation ◽  
Thallus Length ◽  
Natural Means

Abstract The kelp Undaria pinnatifida, native to East Asian shores, was unintentionally introduced with Pacific oysters into the Mediterranean in 1971. Intentional introduction from there to the French Atlantic coast 12 years later led to a gradual spread to the British Isles and the North Sea. Here, we report on the northernmost established population in continental Europe, and suggest a further spread into Scandinavian waters to be almost inevitable. In 2016, several thalli were found washed ashore at the eastern side of the island of Sylt in the northern Wadden Sea (German Bight, Eastern North Sea). Most specimens bore fertile sporophylls and thallus lengths of >1 m were common. In June 2017, 91 sporophytes were found attached to a mixed bed of Pacific oysters and native blue mussels, located just below low tide level in a moderately sheltered position. Mean thallus length was 0.2 m and the longest 0.7 m. Most had distinctive sporophylls and released spores in the laboratory. From sporophylls collected in the previous year, we successfully reared a new generation, demonstrating the kelp’s potential for further spread by natural means or human vectors.

How to include ecological network analysis results in management? A case study of three tidal basins of the Wadden Sea, south-eastern North Sea

2018 ◽  
Vol 163 ◽  
pp. 401-416 ◽  
Author(s):  
Camille de la Vega ◽  
Ulrike Schückel ◽  
Sabine Horn ◽  
Ingrid Kröncke ◽  
Ragnhild Asmus ◽  
...  
Keyword(s):  
Network Analysis ◽  
North Sea ◽  
Wadden Sea ◽  
Ecological Network ◽  
Ecological Network Analysis ◽  
South Eastern ◽  
Tidal Basins

scholarly journals Monitoring juvenile stocks of flatfish in the Wadden Sea and the coastal areas of the southeastern North Sea

1989 ◽  
Vol 43 (3-4) ◽  
pp. 461-477 ◽  
Author(s):  
F. A. Beek ◽  
A. D. Rijnsdorp ◽  
R. Clerck
Keyword(s):  
North Sea ◽  
Wadden Sea ◽  
Coastal Areas

scholarly journals Inventory and comparison of abundance of parasitic copepods on fish hosts in the western Wadden Sea (North Sea) between 1968 and 2010

2013 ◽  
Vol 94 (3) ◽  
pp. 547-555 ◽  
Author(s):  
Wouter Koch ◽  
Peter Boer ◽  
Johannes IJ. Witte ◽  
Henk W. Van der Veer ◽  
David W. Thieltges
Keyword(s):  
North Sea ◽  
Wadden Sea ◽  
Temporal Stability ◽  
Parasite Fauna ◽  
Fixed Number ◽  
Fish Host ◽  
Host Size ◽  
Negative Effects ◽  
Parasitic Copepods ◽  
Fish Hosts

A conspicuous part of the parasite fauna of marine fish are ectoparasites, which attach mainly to the fins or gills. The abundant copepods have received much interest due to their negative effects on hosts. However, for many localities the copepod fauna of fish is still poorly known, and we know little about their temporal stability as long-term observations are largely absent. Our study provides the first inventory of ectoparasitic copepods on fish from the western Wadden Sea (North Sea) based on field data from 1968 and 2010 and additional unpublished notes. In total, 47 copepod parasite species have been recorded on 52 fish host species to date. For two copepod species parasitizing the European flounder (Platichthys flesus), a quantitative comparison of infection levels between 1968 and 2010 was possible. Whereas Acanthochondria cornuta did not show a change in the relationship between host size and infection levels, Lepeophtheirus pectoralis shifted towards the infection of smaller hosts, with higher infection levels in 2010 compared to 1968. These differences probably reflect the biology of the species and the observed decrease in abundance and size of flounders during the last decades. The skin-infecting L. pectoralis can probably compensate for dwindling host abundance by infecting smaller fish and increasing its abundance per given host size. In contrast, the gill cavity inhabiting A. cornuta probably faces a spatial constraint (fixed number of gill arches), thus limiting its abundance and setting a minimum for the host size necessary for infections.

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