Seasonal succession of planktonic foraminifera; results from a four-year time-series sediment trap experiment in the Northeast Pacific

1989 ◽  
Vol 19 (4) ◽  
pp. 253-267 ◽  
Author(s):  
L. R. Sautter ◽  
R. C. Thunell
Keyword(s):  
Time Series ◽  
Sediment Trap ◽  
Planktonic Foraminifera ◽  
Seasonal Succession ◽  
Northeast Pacific ◽  
Trap Experiment

scholarly journals Flux variability of phyto- and zooplankton communities in the Mauritanian coastal upwelling between 2003 and 2008

2020 ◽  
Vol 17 (1) ◽  
pp. 187-214 ◽  
Author(s):  
Oscar E. Romero ◽  
Karl-Heinz Baumann ◽  
Karin A. F. Zonneveld ◽  
Barbara Donner ◽  
Jens Hefter ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Sediment Trap ◽  
Coastal Upwelling ◽  
Planktonic Foraminifera ◽  
Strong Increase ◽  
Significant Shift ◽  
Dinoflagellate Cysts ◽  
Eastern Boundary ◽  
Trap Experiment ◽  
Calcareous Dinoflagellate Cysts

Abstract. Continuous multiyear records of sediment-trap-gained microorganism fluxes are scarce. Such studies are important to identify and to understand the main forcings behind seasonal and multiannual evolution of microorganism flux dynamics. Here, we assess the long-term flux variations and population dynamics of diatoms, coccolithophores, calcareous and organic dinoflagellate cysts, foraminifera and pteropods in the eastern boundary upwelling ecosystem of the Canary Current. A multiannual, continuous sediment trap experiment was conducted at the mooring site CBeu (Cap Blanc eutrophic; ∼20∘ N, 18∘ W; trap depth is ca. 1300 m) off Mauritania (northwest Africa), between June 2003 and March 2008. Throughout the study, the reasonably consistent good match of fluxes of microorganisms and bulk mass reflects the seasonal occurrence of the main upwelling season and relaxation and the contribution of microorganisms to mass flux off Mauritania. A clear successional pattern of microorganisms, i.e., primary producers followed by secondary producers, is not observed. High fluxes of diatoms, coccolithophores, organic dinoflagellate cysts, and planktonic foraminifera occur simultaneously. Peaks of calcareous dinoflagellate cysts and pteropods mostly occurred during intervals of upwelling relaxation. A striking feature of the temporal variability of population occurrences is the persistent pattern of seasonal groups contributions. Species of planktonic foraminifera, diatoms, and organic dinoflagellate cysts typical of coastal upwelling, as well as cooler-water planktonic foraminifera and the coccolithophore Gephyrocapsa oceanica, are abundant at times of intense upwelling (late winter through early summer). Planktonic foraminifera and calcareous dinoflagellate cysts are dominant in warm pelagic surface waters, and all pteropod taxa are more abundant in fall and winter when the water column stratifies. Similarly, coccolithophores of the upper and lower photic zones, together with Emiliania huxleyi, and organic dinoflagellate cysts dominate the assemblage during phases of upwelling relaxation and deeper layer mixing. A significant shift in the “regular” seasonal pattern of taxa relative contribution is observed between 2004 and 2006. Benthic diatoms strongly increased after fall 2005 and dominated the diatom assemblage during the main upwelling season. Additional evidence for a change in population dynamics is the short dominance of the coccolithophore Umbilicosphaera annulus, the occurrence of the pteropod Limacina bulimoides and the strong increase in the flux of calcareous dinoflagellate cysts, abundant in warm tropical oligotrophic waters south of the study area after fall 2005. Altogether, this suggests that pulses of southern waters were transported to the sampling site via the northward Mauritania Current. Our multiannual trap experiment provides a unique opportunity to characterize temporal patterns of variability that can be extrapolated to other eastern boundary upwelling ecosystems (EBUEs), which are experiencing or might experience similar future changes in their plankton community.

scholarly journals Variability of phyto- and zooplankton communities in the Mauritanian coastal upwelling between 2003 and 2008

2019 ◽  
Author(s):  
Oscar E. Romero ◽  
Karl-Heinz Baumann ◽  
Karin A. F. Zonneveld ◽  
Barbara Donner ◽  
Jens Hefter ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Sediment Trap ◽  
Coastal Upwelling ◽  
Planktonic Foraminifera ◽  
Sampling Site ◽  
Strong Increase ◽  
Significant Shift ◽  
Dinoflagellate Cysts ◽  
Trap Experiment ◽  
Calcareous Dinoflagellate Cysts

Abstract. Continuous multiyear records of sediment trap-gained microorganism fluxes are scarce. Such studies are important to identify and to understand the main forcings behind seasonal and multiannual evolution of microorganism flux dynamics. Here, we assess the long-term flux variations and population dynamics of diatoms, coccolithophores, calcareous and organic dinoflagellates, foraminifera and pteropods in the Eastern Boundary Upwelling Ecosystem (EBUE) of the Canary Current. A multiannual, continuous sediment trap experiment was conducted at the mooring site CBeu (Cape Blanc eutrophic, ∼ 20° N, 18° W; trap depth = ca. 1,300 m) off Cape Blanc, Mauritania (northwest Africa), between June 2003 and March 2008. Throughout the study, the reasonably consistent good match of fluxes of microorganisms and bulk mass reflects the seasonal occurrence of the main upwelling season and the contribution of microorganisms to mass flux off Mauritania. A clear successional pattern of microorganisms, i.e. primary producers followed by secondary producers, is not observed. High fluxes of diatoms, coccolithophores, organic dinoflagellates cysts, and planktonic foraminifera occur simultaneously. Peaks of calcareous dinoflagellate cysts and pteropods mostly occurred during intervals of upwelling relaxation. A striking feature of the temporal variability of populations' occurrence is the persistent pattern of seasonal groups' contribution. Species of planktonic foraminifera, diatom, and organic dinoflagellate cysts typical of coastal upwelling as well as cooler water planktonic foraminifera and the coccolithophore Gephyrocapsa oceanica are abundant at times of intense upwelling (late winter through early summer). Planktonic foraminifera and calcareous dinoflagellate cysts dominant in warm pelagic surface waters and all pteropod groups are more abundant in fall and winter, when the mixed layer deepens. Similarly, coccolithophores of the upper- and lower photic zone, together with Emiliania huxleyi, and organic dinoflagellate cysts dominate the assemblage during phases of upwelling relaxation and deeper layer mixing. A significant shift in the regular seasonal pattern of species relative contributions is observed between 2004 and 2006. Benthic diatoms strongly increased after fall 2005 and dominated the diatom assemblage during main upwelling season. Additional evidence for a change in population dynamics are the short dominance of the coccolithophore Umbilicosphaera annulus, the occurrence of the pteropod Limacina bulimoides, and the strong increase in the flux of calcareous dinoflagellate cysts, abundant in tropical, warm oligotrophic waters south of the research area after fall 2005. Altogether, this suggests that pulses of southern waters were transported to the sampling site via the northward Mauritania Current. Our multiannual trap experiment provides a unique opportunity to characterize temporal patterns of variability that can be extrapolated to other EBUEs, which are experiencing or might experience similar future changes in the plankton community.

scholarly journals Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series

2003 ◽  
Vol 18 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Pallavi Anand ◽  
Henry Elderfield ◽  
Maureen H. Conte
Keyword(s):  
Time Series ◽  
Sediment Trap ◽  
Planktonic Foraminifera

Stable isotopes in modern planktonic foraminifera: Sediment trap and plankton tow results from the South China Sea

2011 ◽  
Vol 79 (1-2) ◽  
pp. 15-23 ◽  
Author(s):  
Hui-Ling Lin ◽  
David Der-Duen Sheu ◽  
Yih Yang ◽  
Wen-Chen Chou ◽  
Guo-Wei Hung
Keyword(s):  
Stable Isotopes ◽  
South China Sea ◽  
South China ◽  
Sediment Trap ◽  
Planktonic Foraminifera ◽  
The South China Sea ◽  
The South ◽  
China Sea

scholarly journals A 20-Year Hydroacoustic Time Series of Seismic and Volcanic Events in the Northeast Pacific Ocean

Oceanography ◽  
2011 ◽  
Vol 24 (3) ◽  
pp. 280-293 ◽  
Author(s):  
Robert Dziak ◽  
Stephen Hammond ◽  
Christopher Fox
Keyword(s):  
Time Series ◽  
Pacific Ocean ◽  
Northeast Pacific ◽  
Volcanic Events ◽  
Northeast Pacific Ocean

Seasonal succession and long-term stability of pelagic community in a productive reservoir

2005 ◽  
Vol 56 (8) ◽  
pp. 1137 ◽  
Author(s):  
V. F. Matveev ◽  
L. K. Matveeva
Keyword(s):  
Time Series ◽  
Water Level ◽  
Seasonal Succession ◽  
Perca Fluviatilis ◽  
Taxonomic Composition ◽  
Stationary Time Series ◽  
Introduced Fish ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Murray River

In Lake Hume, a reservoir located in an active agricultural zone of the Murray River catchment, Australia, time series for the abundances of phytoplankton and zooplankton taxa, monitored from 1991 through to 1996, were stationary (without trends), and plankton taxonomic composition did not change. This indicated ecosystem resilience to strong fluctuations in reservoir water level, and to other potential agricultural impacts, for example eutrophication and pollution. Although biological stressors such as introduced fish and invertebrate predators are known to affect planktonic communities and reduce biodiversity in lakes, high densities of planktivorous stages of alien European perch (Perca fluviatilis) and the presence of carp (Cyprinus carpio) did not translate into non-stationary time series or declining trends for plankton in Lake Hume. However, the seasonal successions observed in the reservoir in different years did not conform well to the Plankton Ecology Group (PEG) model. Significant deviations of the Lake Hume successional pattern from the PEG model included maxima for phytoplankton abundance being in winter and the presence of a clear water phase without large zooplankton grazers. The instability of the water level in Lake Hume probably causes the dynamics of most planktonic populations to be less predictable, but did not initiate the declining trends that have been observed in some other Australian reservoirs. Both the PEG model and the present study suggest that hydrology is one of the major drivers of seasonal succession.

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