Resilience of North Sea phytoplankton spring bloom dynamics: An analysis of long-term data at Helgoland Roads

Karen Helen Wiltshire, Arne Michael Malzahn, Kai Wirtz, Wulf Greve, Silvia Janisch, Peter Mangelsdorf, Bryan F J Manly, Maarten Boersma

Research output: Contribution to journalArticle

170 Citations (Scopus)

Abstract

Analyzing one of the most extensive long-term data series in the North Sea, the Helgoland Roads time series, we investigated the changes in the factors that potentially drive phytoplankton bloom dynamics in the German Bight. We compared the changes in these factors with the changes in the spring bloom phenology. We combined zooplankton, nutrient, weather, and phytoplankton data to analyze whether there has been a shift in trophic interactions in the North Sea affecting the spring bloom timing. The potential influence of temperature, with a mean increase of 1.5°C, was investigated. We showed that the German Bight around Helgoland is a highly dynamic system and has undergone considerable change in the last 30 yr. Nutrient levels, temperature, underwater light climate and wind speed have all changed. However, the spring bloom dynamics have hardly changed at all. We showed that the spring bloom tends to come later in warmer years but that this is not directly correlated with the overall warming trend. The known regime shift of the late 1980s is clearly visible in our data in terms of average phytoplankton winter densities and average cell size, but even so the start of the spring bloom has not changed.

Original languageEnglish
Pages (from-to)1294-1302
Number of pages9
JournalLimnology and Oceanography
Volume53
Issue number4
Publication statusPublished - Jul 2008

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dynamic analysis
North Sea
roads
algal bloom
phytoplankton
road
nutrients
algal blooms
nutrient
trophic interaction
wind speed
phenology
time series analysis
zooplankton
temperature
weather
sea
climate
warming
wind velocity

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Wiltshire, K. H., Malzahn, A. M., Wirtz, K., Greve, W., Janisch, S., Mangelsdorf, P., ... Boersma, M. (2008). Resilience of North Sea phytoplankton spring bloom dynamics: An analysis of long-term data at Helgoland Roads. Limnology and Oceanography, 53(4), 1294-1302.

Resilience of North Sea phytoplankton spring bloom dynamics : An analysis of long-term data at Helgoland Roads. / Wiltshire, Karen Helen; Malzahn, Arne Michael; Wirtz, Kai; Greve, Wulf; Janisch, Silvia; Mangelsdorf, Peter; Manly, Bryan F J; Boersma, Maarten.

In: Limnology and Oceanography, Vol. 53, No. 4, 07.2008, p. 1294-1302.

Research output: Contribution to journalArticle

Wiltshire, KH, Malzahn, AM, Wirtz, K, Greve, W, Janisch, S, Mangelsdorf, P, Manly, BFJ & Boersma, M 2008, 'Resilience of North Sea phytoplankton spring bloom dynamics: An analysis of long-term data at Helgoland Roads', Limnology and Oceanography, vol. 53, no. 4, pp. 1294-1302.
Wiltshire KH, Malzahn AM, Wirtz K, Greve W, Janisch S, Mangelsdorf P et al. Resilience of North Sea phytoplankton spring bloom dynamics: An analysis of long-term data at Helgoland Roads. Limnology and Oceanography. 2008 Jul;53(4):1294-1302.
Wiltshire, Karen Helen ; Malzahn, Arne Michael ; Wirtz, Kai ; Greve, Wulf ; Janisch, Silvia ; Mangelsdorf, Peter ; Manly, Bryan F J ; Boersma, Maarten. / Resilience of North Sea phytoplankton spring bloom dynamics : An analysis of long-term data at Helgoland Roads. In: Limnology and Oceanography. 2008 ; Vol. 53, No. 4. pp. 1294-1302.
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