Das Mesozooplankton im Sylter Wattenmeer (Nordsee)

Hickel, Wolfgang

doi:10.1007/bf01611694

Cited by 38 publications

(23 citation statements)

References 2 publications

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“…These determinations for the more abundant taxa, and literature data from Widbom {1984), Hickel (1975), and Faubet {1982) were fitted according to the actual percentages of size classes in the above net sample and thus yielded the following average individual dry weights (all in ~tg) used for biomass calculation: holoplanktonic Appendicularia and Chaetognatha 1.0, calanoid copepods 1.5 (including copepodites but excluding nauplii), planktonic PlatheIminthes 1.0, Rotatoria 0.2 (estimate}; meroplanktonic taxa, nectochaeta larvae and barnacle nauphi 0.3, barnacle cypris larvae 3.0, spionid larvae 5.0, juvenile (5 to 6-setiger) Arenicola marina L. and trochophore larvae 1.0; semiplanktonic harpacticoids 0.8 (including copepodites but excluding nauphi), cyclopoids 0.3, plathelminths 1.0; benthic Ostracoda 2.0, Nematoda 0.5, and Plathelminthes 1.0 (all ~tg DW).…”

Section: Biomass Estimationmentioning

confidence: 53%

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Meiofaunal emergence from intertidal sediment measured in the field: significant contribution to nocturnal planktonic biomass in shallow waters

Armonies

1989

Helgolander Meeresunters

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Field studies on the occurrence of meiobenthos in the water column above intertidal sandflats have been performed near the Island of Sylt in the northern Wadden Sea. Swimming meiobenthos was strongly dominated by harpacticoid copepods. Many of them have a semiplanktonic fife-style. They rest in superficial sediment layers at low tide and swim in the water column at high tide. Swimming activity correlated negatively with light. The abundance in the water column was one order of magnitude higher during the night. Strong currents caused by storm tides significantly decreased meiobenthic abundance in the water column. Light and flow being constant, no significant changes of meiobenthic abundance per unit area occurred over a tidal cycle. Since holoplankton and meroplankton abundances correlated positively with the height of the water column, semiplanktonic meiobenthos may dominate the mesozooplankton in shallow waters. On an average, emergence of meiobenthos increased the mesozooplanktonic biomass by about 2 % during diurnal high tides over the entire tidal cycle, and by about 50 % during nocturnal high tides. Because of seasonal cycles of the dominant harpacticoids, this high contribution to planktonic biomass may be a summer phenomenon.

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Section: Biomass Estimationmentioning

confidence: 53%

“…Thus, sediment-associated meiofauna is only an insignificant component of traditional ship-operated plankton samples (e.g. Hickel, 1975;Martens, 1980). However, semiplanktonic swimmers may aggregate close to the sediment surface, as has been demonstrated by D'Amours (1988).…”

Section: Semiplankton Worldwide Significant In Shallow Watersmentioning

confidence: 91%

Meiofaunal emergence from intertidal sediment measured in the field: significant contribution to nocturnal planktonic biomass in shallow waters

Armonies

1989

Helgolander Meeresunters

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“…Furthermore, some of our stations in the Wadden Sea area have a water depth of less than one metre which is too shallow to close a water sampler. Hickel (1975) obtained up to 10 times more zooplankton compared to net hauls in the research area with the same methods used during this investigation. Even relatively quick zooplankton species such as chaetognatha or copepods like Anomalocera patersonii are caught in higher numbers than with a zooplankton net.…”

Section: Discussionmentioning

confidence: 63%

“…They are thought to be representative for the whole water column. According to Hickel (1975), the strong tidal currents prevent a stratification in the tidal channels. This is confirmed by recent measurements with profiling CTD-probes which show no stable stratification in the research area (Martens.…”

Section: Discussionmentioning

confidence: 99%

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Mesozooplankton in the northern Wadden Sea of Sylt: Seasonal distribution and environmental parameters

Martens¹

1995

Helgolander Meeresunters

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A statistical analysis was performed to determine environmental factors of significant influence on the mesozooplankton in the northern Wadden Sea of Sylt (German Bight) in 1991. The total mesozooplankton (> 76 ~tm) was significantly correlated with water temperature as was the case with the calanoid copepod Acartia sp.; Pseudo-and Paracalanus sp. were influenced by the amount of rainfall, whereas the amount of the meroplanktonic larvae of the cirripedia was related to the amount of particulate organic nitrogen in the water. A comparison of the years 1984 and 1991 demonstrates the positive effect of temperature on the copepod species Acartia sp. in summer.

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Identification of plankton habitats in the North Sea

Plonus,

Floeter

2024

Ecology and Evolution

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The definition of an ecological niche makes it possible to anticipate the responses of a species to changing environmental conditions. Broad tolerance limits and a paucity of readily observable niches in the pelagic zone make it difficult to anticipate responses of the plankton community related to anthropogenic or environmental changes. Plankton distributions are closely linked to climate change and shape the seascape for higher trophic levels, so monitoring plankton distributions and defining ecological niches will help to understand and predict ecosystem responses. Here we apply a machine learning autoencoder and a density‐based clustering algorithm to high‐frequency datasets sampled with a ROTV Triaxus in the North Sea. The results indicate that in this highly dynamic environment, local hydrography prevents niche‐based separation of plankton species at the sub‐mesoscale, despite the availability of different habitats. Plankton patches were associated with naturally occurring frontal systems and anthropogenically induced upwelling‐downwelling dipoles in the vicinity of offshore wind farms (OWFs).

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Das Mesozooplankton im Sylter Wattenmeer (Nordsee)

Cited by 38 publications

References 2 publications

Meiofaunal emergence from intertidal sediment measured in the field: significant contribution to nocturnal planktonic biomass in shallow waters

Meiofaunal emergence from intertidal sediment measured in the field: significant contribution to nocturnal planktonic biomass in shallow waters

Mesozooplankton in the northern Wadden Sea of Sylt: Seasonal distribution and environmental parameters

Identification of plankton habitats in the North Sea

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