Seasonal variations in planktonic foraminifera at three sediment traps in the Subarctic, Transition and Subtropical zones of the central North Pacific Ocean

Eguchi, N.; Ujiié, Hiroshi; Kawahata, Hodaka; Taira, Asahiko

doi:10.1016/s0377-8398(03)00020-3

Cited by 55 publications

(42 citation statements)

References 24 publications

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“…3d-e). This emerging behavior is consistent with observations from sediment traps (Jonkers and Kučera, 2015) and suggests that the seasonality of warm-water species is driven by temperature rather than food availability, which is in agreement with observational studies (e.g., Wolfteich, 1994;Eguchi et al, 1999Eguchi et al, , 2003Kincaid et al, 2000;Kuroyanagi et al, 2002;Mohiuddin et al, 2002Mohiuddin et al, , 2004Storz et al, 2009;Jonkers and Kučera, 2015).…”

Section: Seasonality Of Planktonic Foraminifera Speciessupporting

confidence: 89%

“…PLAFOM2.0 is driven by temperature, the available food sources (including zooplankton, diatoms, small phytoplankton, and organic detritus), and also light availability, whereby the latter only matters with regard to the growth of the two algal symbiont-bearing species (Erez, 1983;Jørgensen et al, 1985;Gastrich, 1987;Gastrich and Bartha, 1988) and G. bulloides, which according to the latest findings hosts the picocyanobacterium Synechococcus as a photosynthesizing endobiont (Bird et al, 2017). Synechococcus is known to be important for cyanobacterial photosynthesis in marine and freshwater ecosystems (Ting et al, 2002;Jodłowska andŚli-wińska, 2014).…”

Section: Plafom20mentioning

confidence: 99%

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Modeling seasonal and vertical habitats of planktonic foraminifera on a global scale

et al. 2018

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Abstract. Species of planktonic foraminifera exhibit specific seasonal production patterns and different preferred vertical habitats. The seasonal and vertical habitats are not constant throughout the range of the species and changes therein must be considered when interpreting paleoceanographic reconstructions based on fossil foraminifera. However, detecting the effect of changing vertical and seasonal habitat on foraminifera proxies requires independent evidence for either habitat or climate change. In practice, this renders accounting for habitat tracking from fossil evidence almost impossible. An alternative method that could reduce the bias in paleoceanographic reconstructions is to predict speciesspecific habitat shifts under climate change using an ecosystem modeling approach. To this end, we present a new version of a planktonic foraminifera model, PLAFOM2.0, embedded into the ocean component of the Community Earth System Model version 1.2.2. This model predicts monthly global concentrations of the planktonic foraminiferal species Neogloboquadrina pachyderma, N. incompta, Globigerina bulloides, Globigerinoides ruber (white), and Trilobatus sacculifer throughout the world ocean, resolved in 24 vertical layers to 250 m of depth. The resolution along the vertical dimension has been implemented by applying the previously used spatial parameterization of carbon biomass as a function of temperature, light, nutrition, and competition on depth-resolved parameter fields. This approach alone results in the emergence of species-specific vertical habitats, which are spatially and temporally variable. Although an explicit parameterization of the vertical dimension has not been carried out, the seasonal and vertical distribution patterns predicted by the model are in good agreement with sediment trap data and plankton tow observations. In the simulation, the colder-water species N. pachyderma, N. incompta, and G. bulloides show a pronounced seasonal cycle in their depth habitat in the polar and subpolar regions, which appears to be controlled by food availability. During the warm season, these species preferably occur in the subsurface (below 50 m of water depth), while towards the cold season they ascend through the water column and are found closer to the sea surface. The warm-water species G. ruber (white) and T. sacculifer exhibit a less variable shallow depth habitat with highest carbon biomass concentrations within the top 40 m of the water column. Nevertheless, even these species show vertical habitat variability and their seasonal occurrence outside the tropics is limited to the warm surface layer that develops at the end of the warm season. The emergence in PLAFOM2.0 of species-specific vertical habitats, which are consistent with observations, indicates that the population dynamics of planktonic foraminifera species may be driven by the same factors in time, space, and with depth, in which case the model can provide a reliable and robust tool to aid the interpretation of proxy records.

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Section: Seasonality Of Planktonic Foraminifera Speciessupporting

confidence: 89%

Section: Plafom20mentioning

confidence: 99%

Modeling seasonal and vertical habitats of planktonic foraminifera on a global scale

et al. 2018

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“…Fairbanks et al, 1982;Curry et al, 1983;Eguchi et al, 2003;Farmer et al, 2007), where maximum abundances may coincide with a deep chlorophyll maximum (Fairbanks et al, 1980;Ravelo et al, 1990). Overall living depth is likely within the upper 200 m (Kroon and Darling, 1995;Farmer et al, 2007).…”

Section: N Dutertrei Is An Intermediate Deep Dwelling Species Livingmentioning

confidence: 99%

Anti-cyclonic eddy imprint on calcite geochemistry of several planktonic foraminiferal species in the Mozambique Channel

Steinhardt

Cléroux

Ullgren³

et al. 2014

Marine Micropaleontology

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Hydrographic conditions in the Mozambique Channel are dominated by the passing of large anticyclonic eddies, propagating poleward into the upstream Agulhas area. Further south, these eddies have been found to control the shedding of Agulhas rings into the Atlantic ocean, thereby playing a key role in Indo-Atlantic Ocean exchange. The element composition of several planktonic foraminifera species collected from sediment trap samples, was compared to in situ water column data from the Mozambique Channel. Single-chamber trace element composition of these foraminifera reveals a close coupling with hydrographic changes induced by anticyclonic eddies.Obtained Mg/Ca values for the surface dwelling Globigerinoides ruber as well as the thermocline dwelling Neogloboquadrina dutertrei follow temperature changes and reduced temperature stratification during eddy conditions. At greater depth, Globorotalia scitula and Pulleniatina obliquiloculata record stable temperatures and thus respond to hydrographic changes with a deepening in habitat depth. Furthermore, test Mn/Ca values indicate a close relationship between water column oxygenation and Mn incorporation in these planktonic foraminiferal species.

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“…Within the euphotic zone, production of CaCO 3 by heterotrophic foraminifera and pteropods would cause calcification to be underestimated if based on PIC/POC ratios in strictly photosynthetic organisms. Even if heterotrophic production of CaCO 3 is taken into account, variability in the relative abundance of autotrophic and heterotrophic calcifying species (Eguchi et al, 2003;Kuroyanagi and Kawahata, 2004) argues against the use of a single PIC/POC ratio for the oceans. To overcome these problems in models,one must explicitly decouple carbonate production from total photosynthesis and simulate carbonate formation by heterotrophic organisms separately (see below).…”

Section: State Of Our Knowledgementioning

confidence: 99%

Pelagic functional group modeling: Progress, challenges and prospects

Hood

Laws

Armstrong

et al. 2006

Deep Sea Research Part II: Topical Studies in Oceanography

218

172

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In this paper, we review the state of the art and major challenges in current efforts to incorporate biogeochemical functional groups into models that can be applied on basin-wide and global scales, with an emphasis on models that might ultimately be used to predict how biogeochemical cycles in the ocean will respond to global warming. We define the term ''biogeochemical functional group'' to refer to groups of organisms that mediate specific chemical reactions in the ocean. Thus, according to this definition, ''functional groups'' have no phylogenetic meaning-these are composed of many different species with common biogeochemical functions. Substantial progress has been made in the last decade toward quantifying the rates of these various functions and understanding the factors that control them. For some of these groups, we have developed fairly sophisticated models that incorporate this understanding, e.g. for diazotrophs (e.g. Trichodesmium), silica producers (diatoms) and calcifiers (e.g. coccolithophorids and specifically Emiliania huxleyi). However, current representations of nitrogen fixation and calcification are incomplete, i.e., based primarily upon models of Trichodesmium and E. huxleyi, respectively, and many important functional groups have not yet been considered in open-ocean biogeochemical models. Progress has been made over the last decade in efforts to simulate dimethylsulfide (DMS) production and cycling (i.e., by dinoflagellates and prymnesiophytes) and denitrification, but these efforts are still in their infancy, and many significant problems remain. ARTICLE IN PRESSOne obvious gap is that virtually all functional group modeling efforts have focused on autotrophic microbes, while higher trophic levels have been completely ignored. It appears that in some cases (e.g., calcification), incorporating higher trophic levels may be essential not only for representing a particular biogeochemical reaction, but also for modeling export. Another serious problem is our tendency to model the organisms for which we have the most validation data (e.g., E. huxleyi and Trichodesmium) even when they may represent only a fraction of the biogeochemical functional group we are trying to represent.When we step back and look at the paleo-oceanographic record, it suggests that oxygen concentrations have played a central role in the evolution and emergence of many of the key functional groups that influence biogeochemical cycles in the present-day ocean. However, more subtle effects are likely to be important over the next century like changes in silicate supply or turbulence that can influence the relative success of diatoms versus dinoflagellates, coccolithophorids and diazotrophs. In general, inferences drawn from the paleo-oceanographic record and theoretical work suggest that global warming will tend to favor the latter because it will give rise to increased stratification. However, decreases in pH and Fe supply could adversely impact coccolithophorids and diazotrophs in the future.It may be necessary...

show abstract

Seasonal variations in planktonic foraminifera at three sediment traps in the Subarctic, Transition and Subtropical zones of the central North Pacific Ocean

Cited by 55 publications

References 24 publications

Modeling seasonal and vertical habitats of planktonic foraminifera on a global scale

Modeling seasonal and vertical habitats of planktonic foraminifera on a global scale

Anti-cyclonic eddy imprint on calcite geochemistry of several planktonic foraminiferal species in the Mozambique Channel

Pelagic functional group modeling: Progress, challenges and prospects

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