Helgoland Roads meso- and macrozooplankton time-series 1974 to 2004: lessons from 30 years of single spot, high frequency sampling at the only off-shore island of the North Sea

Greve, Wulf; Reiners, Frank; Nast, Jutta; Hoffmann, S.

doi:10.1007/s10152-004-0191-5

Cited by 266 publications

(89 citation statements)

References 24 publications

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“…In view of these explanations, the continuing recruitment failure in the Helgoland lobster population may be demonstrated by very low numbers of larvae found in the field. In vertical plankton hauls of the HelgolandÁRoad time-series on meso-and macrozooplankton (Greve et al 2004), lobster larvae were always very rare, e.g. in 2005 only three Zoeae of stage I were caught.…”

Section: Stocks Of European Lobsters (Homarus Gammarusmentioning

confidence: 99%

Vertical positioning and swimming performance of lobster larvae (Homarus gammarus) in an artificial water column at Helgoland, North Sea

Schmalenbach

Búchholz

2010

Marine Biology Research

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Section: Stocks Of European Lobsters (Homarus Gammarusmentioning

confidence: 99%

Vertical positioning and swimming performance of lobster larvae (Homarus gammarus) in an artificial water column at Helgoland, North Sea

Schmalenbach

Búchholz

2010

Marine Biology Research

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“…A11). During the first half of the year, the assumption of zooplankton lagging behind phytoplankton is a well documented feature in marine ecosystems, which was also reported from the nearby time-series station of Helgoland roads (Greve et al, 2004). Later in the year, however, the zooplankton initialisation clearly loses its validity.…”

Section: Ecosystem Modelmentioning

confidence: 63%

“…Before and during the bloom event, however, the balance between algal production and loss in near-shore waters is sensitive to a multitude of different factors such as temperature, water transparency, abundance of herbivores, stratification, or incident irradiance. While a change in light availability is often triggering the spring bloom (Tian et al, 2009;Townsend et al, 1994), grazing by zooplankton or benthic filter feeders is typically the main cause for the breakdown of a bloom (Irigoien et al, 2005;Greve et al, 2004). Hence, the observed variability mainly reflects the sensitivity of the spring bloom development to fluctuating physical and biological conditions.…”

Section: Introductionmentioning

confidence: 99%

Interannual variability of alongshore spring bloom dynamics in a coastal sea caused by the differential influence of hydrodynamics and light climate

Brandt¹,

Wirtz²

2010

Biogeosciences

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Abstract. Timing and spatial distribution of phytoplankton blooms in coastal oceans are highly variable. The interactions of various biological and physical factors leading to the observed variability are complex and remain poorly understood. We present an example for distinct differences in the spatio-temporal chlorophyll a (CHL-a ) distribution on an interannual scale, integrating high-frequency data from an autonomous measuring device (FerryBox), which operated on an alongshore route in the coastal German Bight (North Sea). While in one year the distribution of CHL-a was spatially homogeneous (2004), a bloom only developed in one part of the transect in the following spring period (2005). We use a one-dimensional Lagrangian particle tracking model, which operates along the mean current direction, combined with a NPZ-model to identify the mechanisms controlling the observed interannual bloom variability on the alongshore transect. Our results clearly indicate that in 2004 the local light climate determined the spatial and temporal dynamics of the spring bloom. In contrast, the import of a water mass with elevated CHL-a concentrations from the adjacent Southern Bight triggered the spring bloom in 2005. The inflow event did, however, not last long enough to spread the bloom into the eastern part of the study area, where high turbidity prevented local phytoplankton growth. The model identifies two interacting mechanisms, light climate and hydrodynamics, that controlled the alongshore dynamics. Especially the occurrence of a pronounced spring bloom despite unfavourable light conditions in 2005 underlines the need to carefully consider hydrodynamics to understand the dynamics of the plankton community in coastal environments.

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“…By an inclusion of existing zooplankton abundance data (Greve et al 2004), the grazing pressure on phytoplankton species at Helgoland can be accounted for. Grazers can be included, whereby the effect of grazers on the maximal growth rate is not expected to be large.…”

Section: Comments and Recommendationsmentioning

confidence: 99%

Reconstructing the realized niche of phytoplankton species from environmental data: fitness versus abundance approach

Grüner¹,

Gebühr²,

Boersma³

et al. 2011

Limnology & Ocean Methods

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The classification of the ecological niche and the grouping of species into generalists and specialists are established ecological concepts. In this study, we compare two methods for the calculation of the realized ecological niche from long-term species data. As the first method, we present a new approach to reconstruct the realized niche not in terms of abundance but via a measure of fitness (optimal niche), which we call the Optimal Niche Estimate (ONE). The second method, the outlying mean index (OMI) analysis, is performed with abundance data for calculating the ecological niche. We demonstrate and discuss differences between methods by applying them to time series of three phytoplankton species from the Helgoland Roads long-term data set: Ceratium fusus, Odontella regia, and Paralia sulcata.

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Helgoland Roads meso- and macrozooplankton time-series 1974 to 2004: lessons from 30 years of single spot, high frequency sampling at the only off-shore island of the North Sea

Cited by 266 publications

References 24 publications

Vertical positioning and swimming performance of lobster larvae (Homarus gammarus) in an artificial water column at Helgoland, North Sea

Vertical positioning and swimming performance of lobster larvae (Homarus gammarus) in an artificial water column at Helgoland, North Sea

Interannual variability of alongshore spring bloom dynamics in a coastal sea caused by the differential influence of hydrodynamics and light climate

Reconstructing the realized niche of phytoplankton species from environmental data: fitness versus abundance approach

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