Dinocysts as proxy of primary productivity in mid–high latitudes of the Northern Hemisphere

Radi, Taoufik; Vernal, Anne de

doi:10.1016/j.marmicro.2008.01.012

Cited by 138 publications

(112 citation statements)

References 106 publications

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“…Unlike calcareous microfossils, dinocysts are organic in composition and therefore resistant to dissolution. Being derived from planktonic organisms, they reflect surface-water parameters such as temperature, salinity, sea-ice cover and surface primary productivity and forms of nitrogen (such as nitrate versus ammonium), rather than conditions on the seafloor (Dale, 1996;Radi et al, 2007Radi et al, , 2008. However, some species, many of them heterotrophic, are characteristic of eutrophic conditions, both natural and anthropogenic, and thus may be associated with seafloor hypoxia .…”

Section: Dinoflagellate Cystsmentioning

confidence: 99%

Historical records of coastal eutrophication-induced hypoxia

Jorissen²,

et al. 2009

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Abstract. Under certain conditions, sediment cores from coastal settings subject to hypoxia can yield records of environmental changes over time scales ranging from decades to millennia, sometimes with a resolution of as little as a few years. A variety of biological and geochemical indicators (proxies) derived from such cores have been used to reconstruct the development of eutrophication and hypoxic conditions over time. Those based on (1) the preserved remains of benthic organisms (mainly foraminiferans and ostracods), (2) sedimentary features (e.g. laminations) and (3) sediment chemistry and mineralogy (e.g. presence of sulphides and redox-sensitive trace elements) reflect conditions at or close to the seafloor. Those based on (4) the preserved remains of planktonic organisms (mainly diatoms and dinoflagellates), (5) pigments and lipid biomarkers derived from prokaryotes and eukaryotes and (6) organic C, N and their stable isotope ratios reflect conditions in the water column. However, the interpretation of these indicators is not straightforward. A central difficulty concerns the fact that hypoxia is strongly correlated with, and often induced by, organic enrichment caused by eutrophication, making it difficult to separate the effects of these phenomena in sediment records. The problem is compounded by the enhanced preservation in anoxic and hypoxic sediments of organic microfossils and biomarkers indicating eutrophication. The use of hypoxiaCorrespondence to: A. J. Gooday (ang@noc.soton.ac.uk) specific proxies, such as the trace metals molybdenum and rhenium and the bacterial biomarker isorenieratene, together with multi-proxy approaches, may provide a way forward. All proxies of bottom-water hypoxia are basically qualitative; their quantification presents a major challenge to which there is currently no satisfactory solution. Finally, it is important to separate the effects of natural ecosystem variability from anthropogenic effects. Despite these problems, in the absence of historical data for dissolved oxygen concentrations, the analysis of sediment cores can provide plausible reconstructions of the temporal development of humaninduced hypoxia, and associated eutrophication, in vulnerable coastal environments.

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Section: Dinoflagellate Cystsmentioning

confidence: 99%

Historical records of coastal eutrophication-induced hypoxia

Jorissen²,

et al. 2009

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“…The terrigenous input clearly suggests that the sea level was low under a neritic shallow environment, possibly lagoonal with increased salinity. High tolerance of Homotryblium to high salinity is presented by Pross and Schmiedl (2002) whereas its prevalence in lagoonal environments is indicated by Radi and Vernal (2008).…”

Section: Resultsmentioning

confidence: 99%

Similarities of the K/Pc dinoflagellate cyst associations between South Atlantic and Indian proto-oceans

Menezes¹,

Garcia²,

Premaor³

et al. 2016

Geol. USP. Sér. Cient.

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In this contribution we present the composition of the Late Cretaceous / Paleocene dinoflagellate cyst assemblages found in the Pelotas Basin, southern Brazil in order to provide a first paleobiogeographical comparison between this location, India and other former Gondwana continents: South America (Argentina and Uruguay), Africa (Nigeria and Western Ghana), Antarctica, Australia, and New Zealand. A total of 13 taxa, some endemic and other cosmopolitan were identified. The paleoenvironment of the Gondwana former members basins, as previously presented and attested by the dinoflagellate cysts are marginal marine nearshore, varying from neritic to shallow neritic and lagoonal or coastal swamps, which permitted the deposition of sediments in anoxic marine conditions. The present analysis of similarity between K/Pc dinoflagellate cyst associations allowed the establishment of paleobiogeographic distribution.

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“…The only ecological group erected is Protoperidinium spp., which includes the round brown cysts and all species of the genera Trinovantedinium, Barssidinium, Sumatradinium, Selenopemphix, Lejeunecysta, Xandarodinium, Brigantedinium and Cristadinium, as there is a positive correlation between cysts of heterotrophic taxa in Quaternary to recent sediments and productivity (e.g. Devillers and de Vernal, 2000;Reichart and Brinkhuis, 2003;Radi and de Vernal, 2008). Moreover, a number of protoperidinioid species prefer diatoms as a specific food source (e.g.…”

Section: Ecologymentioning

confidence: 99%

“…Despite a high abundance of Protoperidinium spp. between 8.5 and 8.2 Ma, which is usually associated with elevated primary productivity (Reichart and Brinkhuis, 2003;Radi and de Vernal, 2008) dinocyst concentration drops significantly at 8.6 Ma. Thus, the abundance of protoperidiniacean taxa (mainly C. cristatoserratum, round brown cysts; Fig.…”

Section: Enhanced Cold-water Advection Into the Iceland Sea (~9-84 Ma)mentioning

confidence: 99%

“…Thus, the abundance of protoperidiniacean taxa (mainly C. cristatoserratum, round brown cysts; Fig. 3, Appendix A) may result from severe sea-surface conditions with sea ice cover (Rochon et al, 1999;Radi and de Vernal, 2008). Coincidentally, Engel (1992) reported a shift to a cold-adapted dinocyst assemblage transported from polar regions to DSDP Site 408, located just south of the Denmark Strait, and δ 18 O data (Aksu and HillaireMarcel, 1989) and changes in the coiling ratio of Neogloboquadrina atlantica (Aksu and Kaminski, 1989) at ODP Site 646 in the Labrador Sea strongly suggest strengthened influence of cold water at this time.…”

Section: Enhanced Cold-water Advection Into the Iceland Sea (~9-84 Ma)mentioning

confidence: 99%

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Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Schreck

Méheust

Stein

et al. 2013

Marine Micropaleontology

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The present study on ODP Leg 151 Hole 907A combines a detailed analysis of marine palynomorphs (dinoflagellate cysts, prasinophytes, and acritarchs) and a low-resolution alkenone-based sea-surface temperature (SST) record for the interval between 14.5 and 2.5 Ma, and allows to investigate the relationship between palynomorph assemblages and the paleoenvironmental evolution of the Iceland Sea. A high marine productivity is indicated in the Middle Miocene, and palynomorphs and SSTs both mirror the subsequent long-term Neogene climate deterioration. The diverse Middle Miocene palynomorph assemblages clearly diminish towards the impoverished assemblages of the Late Pliocene; parallel with a somewhat gradual decrease of SSTs being as high as 20°C at~13.5 Ma to around 8°C at~3 Ma. Superimposed, palynomorph assemblages not only reflect Middle to Late Miocene climate variability partly coinciding with the short-lived global Miocene isotope events (Mi-events), but also the initiation of a proto-thermohaline circulation across the Middle Miocene Climate Transition, which led to increased meridionality in the Nordic Seas. Last occurrences of species cluster during three events in the Late Miocene to Early Pliocene and are ascribed to the progressive strengthening and freshening of the proto-East Greenland Current towards modern conditions. A significant high latitude cooling between 6.5 and 6 Ma is depicted by the supraregional "Decahedrella event" coeval with lowest Miocene productivity and a SST decline. In the Early Pliocene, a transient warming is accompanied by surface water stratification and increased productivity that likely reflects a high latitude response to the global biogenic bloom. The succeeding crash in palynomorph accumulation, and a subsequent interval virtually barren of marine palynomorphs may be attributed to enhanced bottom water oxygenation and substantial sea ice cover, and indicates that conditions seriously affecting marine productivity in the Iceland Sea were already established well before the marked expansion of the Greenland Ice Sheet at 3.3 Ma.

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Dinocysts as proxy of primary productivity in mid–high latitudes of the Northern Hemisphere

Cited by 138 publications

References 106 publications

Historical records of coastal eutrophication-induced hypoxia

Historical records of coastal eutrophication-induced hypoxia

Similarities of the K/Pc dinoflagellate cyst associations between South Atlantic and Indian proto-oceans

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

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