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

Schönfeld, Joachim

doi:10.5194/jm-37-383-2018

Cited by 13 publications

(6 citation statements)

References 39 publications

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“…Salinity and temperature of Esteiro do Ancão ebb waters were routinely measured during the sampling campaigns with hand-held WTW Cond 3210 or LF320 conductimeters equipped with a TetraCon 325 probe. The conductimeters had a precision of < 0.5 % of measured conductivity and < 0.1 K according to a manufacturer's test certificate (Schönfeld, 2018). Water samples were taken from ebb waters in winter 2016/2017, and during the sampling campaigns in 2017, 2018 and 2019.…”

Section: Methodsmentioning

confidence: 99%

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Environmental triggers of faunal changes revealed by benthic foraminiferal monitoring

Schönfeld

Mendes

2021

Estuarine, Coastal and Shelf Science

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Section: Methodsmentioning

confidence: 99%

“…The few studies reveal that foraminiferal response happens very fast, or with a delay of some years due to the accumulation of empty tests in the sediment (e.g. Mendes et al, 2020;Schönfeld, 2018).…”

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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“…Second, these events occurred at a constant rate over time. These limitations are, however, rather an exception than the rule in nature: many benthic foraminifera show seasonal re-production events that are linked to pulses of food supply or to the excess of certain temperature or salinity thresholds (Gooday, 1988;Lambshead and Gooday, 1990;Altenbach, 1992;Lutze and Wefer, 1980;Schönfeld and Numberger, 2007;Schönfeld, 2018). Food particles are not evenly distributed on the sea floor but scattered (e.g.…”

Section: Constraints On the Pulsating Patch Modelmentioning

confidence: 99%

Benthic foraminiferal patchiness – revisited

Schönfeld,

Glock,

Polovodova Asteman

et al. 2023

J. Micropalaeontol.

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Abstract. Many benthic organisms show aggregated distribution patterns due to the spatial heterogeneity of niches or food availability. In particular, high-abundance patches of benthic foraminifera have been reported that extend from centimetres to metres in diameter in salt marshes or shallow waters. The dimensions of spatial variations of shelf or deep-sea foraminiferal abundances have not yet been identified. Therefore, we studied the distribution of Globobulimina turgida dwelling in the 0–3 cm surface sediment at 118 m water depth in the Alsbäck Deep, Gullmar Fjord, Sweden. Standing stock data from 58 randomly replicated samples depicted a log-normal distribution of G. turgida with weak evidence for an aggregated distribution on a decimetre scale. A model simulation with different patch sizes, outlines, and impedances yielded no significant correlation with the observed variability of G. turgida standing stocks. Instead, a perfect match with a random log-normal distribution of population densities was obtained. The data–model comparison revealed that foraminiferal populations in the Gullmar Fjord were not moulded by any underlying spatial structure beyond 10 cm diameter. Log-normal population densities also characterise data from contiguous, gridded, or random sample replicates reported in the literature. Here, a centimetre-scale heterogeneity was found and interpreted to be a result of asexual reproduction events and restricted mobility of juveniles. Standing stocks of G. turgida from the Alsbäck Deep temporal data series from 1994 to 2021 showed two distinct cohorts of samples of either high or low densities. These cohorts are considered to represent two distinct ecological settings: hypoxic and well-ventilated conditions in the Gullmar Fjord. Environmental forcing is therefore considered to impact the population structure of benthic foraminifera rather than their reproduction dynamics.

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“…Their short generation time and good preservation potential of dead, empty tests [31][32][33], render benthic foraminifera a prominent tool for reconstructing environmental parameters in the present and past [34]. This particularly holds true under the ongoing anthropogenic pressure, like global warming and pollution, as foraminiferal assemblage structures are going to change dramatically [35][36][37][38]. Even though the sensitivity living species for certain environmental parameters have been well constrained, the living fauna represents only a snapshot in time.…”

Section: Denmarkmentioning

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

Cited by 13 publications

References 39 publications

Environmental triggers of faunal changes revealed by benthic foraminiferal monitoring

Environmental triggers of faunal changes revealed by benthic foraminiferal monitoring

Benthic foraminiferal patchiness – revisited

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

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