Environmental forcing as a main determinant of bloom dynamics of the<i>Chrysochromulina</i>algae

Lekve, Kyrre; Bagøien, Espen; Dahl, Einar; Edvardsen, Bente; Skogen, Morten D.; Stenseth, Nils Chr.

doi:10.1098/rspb.2006.3656

Cited by 16 publications

(19 citation statements)

References 30 publications

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“…From such studies, members of Chrysochromulina sensu lato (defined above) and Imantonia (both belonging to Prymnesiales) have been reported as the most abundant groups in June–September/October (Kuylenstierna & Karlson 1994; Dahl & Johannessen 1998; Lekve et al . 2006). Previous electron microscopy investigations of phytoplankton in the Kattegat and Skagerrak have revealed occurrence of c .…”

Section: Discussionmentioning

confidence: 99%

Seasonal diversity and dynamics of haptophytes in theSkagerrak,Norway, explored by high‐throughput sequencing

et al. 2015

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Microalgae in the division Haptophyta play key roles in the marine ecosystem and in global biogeochemical processes. Despite their ecological importance, knowledge on seasonal dynamics, community composition and abundance at the species level is limited due to their small cell size and few morphological features visible under the light microscope. Here, we present unique data on haptophyte seasonal diversity and dynamics from two annual cycles, with the taxonomic resolution and sampling depth obtained with high-throughput sequencing. From outer Oslofjorden, S Norway, nano- and picoplanktonic samples were collected monthly for 2 years, and the haptophytes targeted by amplification of RNA/cDNA with Haptophyta-specific 18S rDNA V4 primers. We obtained 156 operational taxonomic units (OTUs), from c. 400.000 454 pyrosequencing reads, after rigorous bioinformatic filtering and clustering at 99.5%. Most OTUs represented uncultured and/or not yet 18S rDNA-sequenced species. Haptophyte OTU richness and community composition exhibited high temporal variation and significant yearly periodicity. Richness was highest in September–October (autumn) and lowest in April–May (spring). Some taxa were detected all year, such as Chrysochromulina simplex, Emiliania huxleyi and Phaeocystis cordata, whereas most calcifying coccolithophores only appeared from summer to early winter. We also revealed the seasonal dynamics of OTUs representing putative novel classes (clades HAP-3–5) or orders (clades D, E, F). Season, light and temperature accounted for 29% of the variation in OTU composition. Residual variation may be related to biotic factors, such as competition and viral infection. This study provides new, in-depth knowledge on seasonal diversity and dynamics of haptophytes in North Atlantic coastal waters.

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Section: Discussionmentioning

confidence: 99%

Seasonal diversity and dynamics of haptophytes in theSkagerrak,Norway, explored by high‐throughput sequencing

et al. 2015

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“…are potentially toxic nanoflagellates, which can efficiently utilize the low nutrient levels typical during summer [32]. Chrysochromulina spp.…”

Section: Discussionmentioning

confidence: 99%

Climate Change and Eutrophication Induced Shifts in Northern Summer Plankton Communities

et al. 2013

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Marine ecosystems are undergoing substantial changes due to human-induced pressures. Analysis of long-term data series is a valuable tool for understanding naturally and anthropogenically induced changes in plankton communities. In the present study, seasonal monitoring data were collected in three sub-basins of the northern Baltic Sea between 1979 and 2011 and statistically analysed for trends and interactions between surface water hydrography, inorganic nutrient concentrations and phyto- and zooplankton community composition. The most conspicuous hydrographic change was a significant increase in late summer surface water temperatures over the study period. In addition, salinity decreased and dissolved inorganic nutrient concentrations increased in some basins. Based on redundancy analysis (RDA), warming was the key environmental factor explaining the observed changes in plankton communities: the general increase in total phytoplankton biomass, Cyanophyceae, Prymnesiophyceae and Chrysophyceae, and decrease in Cryptophyceae throughout the study area, as well as increase in rotifers and decrease in total zooplankton, cladoceran and copepod abundances in some basins. We conclude that the plankton communities in the Baltic Sea have shifted towards a food web structure with smaller sized organisms, leading to decreased energy available for grazing zooplankton and planktivorous fish. The shift is most probably due to complex interactions between warming, eutrophication and increased top-down pressure due to overexploitation of resources, and the resulting trophic cascades.

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“…The spring bloom in the Kattegat between Denmark and Sweden is usually dominated by diatom species. In the late spring of 1988, however, the prymnesiophyte Chrysochromulina polylepis produced a major bloom with severe toxic effects on higher organisms, including fish, molluscs, ascidians and cnidarians (Nielsen et al 1990;Lekve et al 2006). Since the 1988 event, large-scale blooms of Chrysochromulina have not returned in the area.…”

Section: Discussion (A) Interannual Variability As An Intrinsic Propertymentioning

confidence: 99%

Interannual variability in species composition explained as seasonally entrained chaos

et al. 2009

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The species composition of plankton, insect and annual plant communities may vary markedly from year to year. Such interannual variability is usually thought to be driven by year-to-year variation in weather conditions. Here we examine an alternative explanation. We studied the effects of regular seasonal forcing on a multi-species predator-prey model consisting of phytoplankton and zooplankton species. The model predicts that interannual variability in species composition can easily arise without interannual variability in external conditions. Seasonal forcing increased the probability of chaos in our model communities, but squeezed these irregular species dynamics within the seasonal cycle. As a result, the population dynamics had a peculiar character. Consistent with long-term time series of natural plankton communities, seasonal variation led to a distinct seasonal succession of species, yet the species composition varied from year to year in an irregular fashion. Our results suggest that interannual variability in species composition is an intrinsic property of multi-species communities in seasonal environments.

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Environmental forcing as a main determinant of bloom dynamics of theChrysochromulinaalgae

Cited by 16 publications

References 30 publications

Seasonal diversity and dynamics of haptophytes in theSkagerrak,Norway, explored by high‐throughput sequencing

Seasonal diversity and dynamics of haptophytes in theSkagerrak,Norway, explored by high‐throughput sequencing

Climate Change and Eutrophication Induced Shifts in Northern Summer Plankton Communities

Interannual variability in species composition explained as seasonally entrained chaos

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