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

Sautter, L.; Thunell, Robert C.

doi:10.2113/gsjfr.19.4.253

Cited by 150 publications

(98 citation statements)

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“…2C). A similar reversal was also observed at about 8 ka by Rohling et al (1995) and at 7/8 ka by Rohling and De Rijk (1999), and was attributed to a deepening and strengthening of the pycnocline/nutricline between the AW and the light MW due to the onset of modern oceanographic conditions (Fairbanks and Wiebe, 1980;Fairbanks et al, 1982;Reynolds and Thunell, 1986;Weaver and Pujol, 1988;Sautter and Thunell, 1989;Rohling et al, 1995). Our data confirm the age of the circulation shift and allow linking it to the end of the African Humid Period with precipitation decline and aridification, which started as early as 7-8 ka in many North African areas (Liu et al, 2007).…”

Section: Maya Mud Volcanosupporting

confidence: 66%

Growth and demise of cold-water coral ecosystems on mud volcanoes in the West Alboran Sea: The messages from the planktonic and benthic foraminifera

et al. 2011

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The Dhaka and Maya mud volcanoes (MVs), located in the Mud Diapir Province in the Western Alboran Basin along the Moroccan Coasts, were cored during the TTR-17, Leg 1 cruise. Cores were taken on the top of the volcanoes at a water depth of 370 m on the Dhaka MV (core TTR17-MS411G) and at 410 m water depth on the Maya MV (core TTR17-MS419G), respectively. On both mud volcanoes the extruded mud breccia provides the nucleation point for the colonization and development of cold-water corals and associated ecosystems. Two phases of cold-water coral growth are observed: (1) between slightly older than 4175± 62 years BP and around 2230± 59 years BP at Dhaka, and (2) between slightly older than 15583 ± 185 years BP and around 7613 ± 38 years BP at Maya MV. On the top of the Maya MV only a small patch reef and/or isolated corals proliferated, whereas a more extended patch reef colonized the top of the Dhaka MV. At both sites the cold-water coral development was triggered by the availability of a suitable substrate for initial coral settling, provided either as a firm ground or as single clasts. Subsequently coral growth was supported by enhanced nutrient flux possibly related to upwelling and/or strong currents. During the intervals of coral growth planktonic foraminiferal assemblages were dominated by Neogloboquadrina incompta. The decline of coral ecosystems on the mud volcanoes is accompanied at surface by a shift from the N. incompta dominated assemblage to a Globorotalia inflata dominated assemblage, possibly reflecting more oligotrophic conditions. This shift is coeval to the passage from wet to arid conditions at the end of the African Humid Period at Maya MV. It is interpreted as an effect of an early human impact on a fragile environment, which was already stressed by desiccation at the time of the development of complex human society along the Mediterranean coasts, at Dhaka MV.

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Section: Maya Mud Volcanosupporting

confidence: 66%

Growth and demise of cold-water coral ecosystems on mud volcanoes in the West Alboran Sea: The messages from the planktonic and benthic foraminifera

et al. 2011

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“…Upwellig activity has a strong signature in the fluxes and composition of planktonic foraminifera assemblages (Cullen and Prell, 1984;Curry et al, 1992;Conan and Brummer, 2000). Within these assemblages, G. bulloides, which is a common midlatitude and subpolar species, is particularly abundant in eutrophic waters with high phytoplankton productivity (Sautter and Thunell, 1989;Ortiz et al, 1995;Watkins and Mix, 1998;Zaric et al, 2005), explaining its abundance in upwelling cells developing at various locations around the Arabian Sea, such as on the Oman Margin or on the western side of India (Prell and Curry, 1981;Naidu, 1990Naidu, , 1993. In the northern Indian Ocean, G. bulloides relative abundance (Prell and Curry, 1981;Naidu and Malmgren, 1995;Gupta et al, 2003;Anderson et al, 2010) and G. bulloides flux (Conan and Brummer, 2000;Naidu and Malmgren, 1996) have been successfully used to reconstruct past changes in the intensity of monsoon-driven upwellings.…”

Section: G Bulloides Abundance -Productivity Proxymentioning

confidence: 99%

Holocene evolution of summer winds and marine productivity in the tropical Indian Ocean in response to insolation forcing: data-model comparison

et al. 2011

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Abstract. The relative abundance of Globigerinoides bulloides was used to infer Holocene paleo-productivity changes on the Oman margin and at the southern tip of India. Today, the primary productivity at both sites reaches its maximum during the summer season, when monsoon winds result in local Eckman pumping, which brings more nutrients to the surface. On a millennium time-scale, however, the % G. bulloides records indicate an opposite evolution of paleo-productivity at these sites through the Holocene. The Oman Margin productivity was maximal at ∼9 ka (boreal summer insolation maximum) and has decreased since then, suggesting a direct response to insolation forcing. On the contrary, the productivity at the southern tip of India was minimum at ∼9 ka, and strengthened towards the present.Paleo-reconstructions of wind patterns, marine productivity and foraminifera assemblages were obtained using the IPSL-CM4 climate model coupled to the PISCES marine biogeochemical model and the FORAMCLIM ecophysiological model. These reconstructions are fully coherent with the marine core data. They confirm that the evolution of particulate export production and foraminifera assemblages at our two sites were directly linked with the strength of the upwelling. Model simulations at 9 ka and 6 ka BP show that the relative evolution between the two sites since the early Holocene can be explained by the weakening but also the southward shift of monsoon winds over the Arabian Sea during boreal summer.

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“…11), which can be significant (e.g. Sautter and Thunell, 1989;Tedesco and Thunell, 2003;Marchant et al, 2004).…”

Section: Pitfalls and Potential Of The Modelmentioning

confidence: 99%

Global prediction of planktic foraminiferal fluxes from hydrographic and productivity data

2006

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Abstract. Understanding and quantifying the seasonal and spatial distribution of planktic foraminiferal fluxes reflected in sedimentary assemblages is key to interpret foraminiferabased proxies in paleoceanography. Towards this goal we present an empirical model to predict foraminiferal fluxes on a global scale.A compilation of planktic foraminiferal flux and export production data from globally distributed sediment traps together with environmental data of sea-surface temperature and mixed-layer depth from online databases is used to calibrate the model that calculates monthly foraminiferal fluxes for the 18 most common species. The calibrated model is then forced with a global data set of hydrographic and productivity data to predict monthly foraminiferal fluxes worldwide. The predictive skills of the model are assessed by comparing the model output with planktic foraminiferal assemblages from globally distributed surface sediments as well as with measured foraminiferal fluxes of sediment traps not included in the calibration data set.Many general distribution patterns of foraminiferal species recognized from the model output compare favorably with observations from coretops or sediment traps, even though the model still produces problematic results in some places. Among others, meridional gradients in species richness and diversity, increased relative abundances of Neogloboquadrina pachyderma (dex.) in upwelling areas, and peak abundances of Globigerinella siphonifera in oligotrophic subtropical gyres show good agreement between model and coretops. Absolute foraminiferal fluxes are significantly underestimated in most cases, while seasonal variations can be reproduced for some species. Interannual differences in foraminiferal fluxes are not reflected by the model which might partly be due to a lack of actual environmental data for the calibration and model experiments.Correspondence to: S.Žarić (zaric@uni-bremen.de)The limited predictive skills of the model suggest that additional parameters should be considered. Export production should probably be replaced by a more realistic representation of food availability for planktic foraminifera. This could be achieved by adding a dynamic component to the model and linking it to an ecosystem model.

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

Cited by 150 publications

References 0 publications

Growth and demise of cold-water coral ecosystems on mud volcanoes in the West Alboran Sea: The messages from the planktonic and benthic foraminifera

Growth and demise of cold-water coral ecosystems on mud volcanoes in the West Alboran Sea: The messages from the planktonic and benthic foraminifera

Holocene evolution of summer winds and marine productivity in the tropical Indian Ocean in response to insolation forcing: data-model comparison

Global prediction of planktic foraminiferal fluxes from hydrographic and productivity data

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