Recent oxygen depletion and benthic faunal change in shallow areas of Sannäs Fjord, Swedish west coast

Nordberg, Kjell; Asteman, Irina Polovodova; Gallagher, Tom; Robijn, Ardo

doi:10.1016/j.seares.2017.02.006

Cited by 22 publications

(11 citation statements)

References 64 publications

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“…Horton and Edwards, 2006;Polyak et al, 2002;Nordberg et al, 2017). The salinities prevailing at the sampling sites on British intertidal flats were open marine, and they were not lower than 25 units in the southern Kara Sea, which assigns E. incertum as a stenohaline organism (Darling et al, 2016).…”

Section: Recognition Of Elphidium Incertummentioning

confidence: 92%

Monitoring benthic foraminiferal dynamics at Bottsand coastal lagoon (western Baltic Sea)

Schönfeld

2018

J. Micropalaeontol.

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Abstract. Benthic foraminifera from Bottsand coastal lagoon, western Baltic Sea, have been studied since the mid-1960s. They were monitored annually in late autumn since 2003 at the terminal ditch of the lagoon. There were 12 different species recognised, of which three have not been recorded during earlier investigations. Dominant species showed strong interannual fluctuations and a steady increase in population densities over the last decade. Elphidium incertum, a stenohaline species of the Baltic deep water fauna, colonised the Bottsand lagoon in 2016, most likely during a period of salinities >19 units and water temperatures of 18 • C on average in early autumn. The high salinities probably triggered their germination from a propagule bank in the ditch bottom sediment. The new E. incertum population showed densities higher by an order of magnitude than those of the indigenous species. The latter did not decline, revealing that E. incertum used another food source or occupied a different microhabitat. Elphidium incertum survived transient periods of lower salinities in late autumn 2017, though with reduced abundances, and became a regular faunal constituent at the Bottsand lagoon.

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Section: Recognition Of Elphidium Incertummentioning

confidence: 92%

Monitoring benthic foraminiferal dynamics at Bottsand coastal lagoon (western Baltic Sea)

Schönfeld

2018

J. Micropalaeontol.

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“…A growing literature has demonstrated that benthic foraminifera were reliable indicators for environmental and paleoenvironmental conditions as well as for the ecosystem status in general [e.g., [12][13][14][15][16][17][18][19][20][21][22]. Furthermore, they are highly sensitive to small changes in critical environmental parameters like salinity [23,24], temperature [25,26] or carbonate system parameters [27][28][29][30].…”

Section: Denmarkmentioning

confidence: 99%

“…Ammoscalaria runiana (Heron-Allen and Earland) = Haplophragmium runiana Heron-Allen and Earland 1916 [114] [12], pl. 1, fig.…”

Section: Appendix 1 Foraminiferal Reference List and Taxonomic Notesmentioning

confidence: 99%

Living and dead foraminiferal assemblage from the supratidal sand Japsand, North Frisian Wadden Sea: distributional patterns and controlling factors

Schmidt

Schönfeld

2021

Helgol Mar Res

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Supratidal sands are vitally important for coastal defence in the German Wadden Sea. They are less affected by human activities than other areas as they are located far off the mainland shore, touristical and commercial activities are generally prohibited. Therefore, supratidal sands are of high ecological interest. Nevertheless, the faunal inventory and distribution pattern of microorganisms on these sands were studied very little. The composition of living and dead foraminiferal assemblages was therefore investigated along a transect from the supratidal sand Japsand up to Hallig Hooge. Both assemblages were dominated by calcareous foraminifera of which Ammonia batava was the most abundant species. Elphidium selseyense and Elphidium williamsoni were also common in the living assemblage, but Elphidium williamsoni was comparably rare in the dead assemblage. The high proportions of Ammonia batava and Elphidium selseyense in the living assemblage arose from the reproduction season that differed between species. While Ammonia batava and Elphidium selseyense just finished their reproductive cycles, Elphidium williamsoni was just about to start. This was also confirmed by the size distribution patterns of the different species. The dead assemblage revealed 20 species that were not found in the living assemblage of which some were reworked from older sediments (e.g., Bucella frigida) and some were transported via tidal currents from other areas in the North Sea (e.g., Jadammina macrescens). The living foraminiferal faunas depicted close linkages between the open North Sea and the mainland. Key species revealing exchange between distant populations were Haynesina germanica, Ammonia batava and different Elphidium species. All these species share an opportunistic behaviour and are able to inhabit a variety of different environments; hence, they well may cope with changing environmental conditions. The benthic foraminiferal association from Japsand revealed that transport mechanisms via tides and currents play a major ecological role and strongly influence the faunal composition at this site.

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“…Therefore, foraminifera are widely used as proxies in both, Recent and palaeo-environmental studies (e.g. Mojtahid et al, 2009;Bouchet et al, 2012;Dolven et al, 2013;Duffield et al, 2015;Mendes et al 2013;Nordberg et al, 2017;Polovodova Asteman and Nordberg, 2013). Only a few laboratory experiments unveiled the response pattern of certain species or assemblages to the deterioration of environmental parameters such as temperature, salinity, oxygen, food supply and trace-metal pollution (Alve and Bernhard, 1995;Altenbach, 1992;Elderfield et al, 2006;Havach et al, 2001;Le Cadre and Debenay, 2006).…”

Section: Introductionmentioning

confidence: 99%

Environmental triggers of faunal changes revealed by benthic foraminiferal monitoring

Schönfeld

Mendes

2021

Estuarine, Coastal and Shelf Science

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Recent oxygen depletion and benthic faunal change in shallow areas of Sannäs Fjord, Swedish west coast

Cited by 22 publications

References 64 publications

Monitoring benthic foraminiferal dynamics at Bottsand coastal lagoon (western Baltic Sea)

Monitoring benthic foraminiferal dynamics at Bottsand coastal lagoon (western Baltic Sea)

Living and dead foraminiferal assemblage from the supratidal sand Japsand, North Frisian Wadden Sea: distributional patterns and controlling factors

Environmental triggers of faunal changes revealed by benthic foraminiferal monitoring

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