Lilliput effect in late Maastrichtian planktic foraminifera: Response to environmental stress

Keller, Gerta; Abramovich, Sigal

doi:10.1016/j.palaeo.2009.08.029

Cited by 116 publications

(105 citation statements)

References 68 publications

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“…Berggren et al 1995;Ogg & Hinnov 2012), was recently replaced with the planktonic foraminiferal Hedbergella holmdelensis Subzone forming the lower subzone of the G. cretacea Zone. The H. holmdelensis Subzone is also an acme biozone, similarly to the whole G. cretacea Zone (Arenilllas et al 2004Gallala et al 2009 (Keller & Abramovich 2009). A shift in ecological setting, especially the increase in environmental stress inferred by climate changes, led to its absence in some basins (see Keller & Abramovich 2009).…”

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

“…The H. holmdelensis Subzone is also an acme biozone, similarly to the whole G. cretacea Zone (Arenilllas et al 2004Gallala et al 2009 (Keller & Abramovich 2009). A shift in ecological setting, especially the increase in environmental stress inferred by climate changes, led to its absence in some basins (see Keller & Abramovich 2009). Generally, A. mayaroensis is a very rare species, even at the El Kef GSSP, so its application for biostratigraphy is somewhat problematic (see Molina et al 2006;Keller & Abramovich 2009; and references cited therein).…”

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

“…A shift in ecological setting, especially the increase in environmental stress inferred by climate changes, led to its absence in some basins (see Keller & Abramovich 2009). Generally, A. mayaroensis is a very rare species, even at the El Kef GSSP, so its application for biostratigraphy is somewhat problematic (see Molina et al 2006;Keller & Abramovich 2009; and references cited therein). As a result, Li & Keller (1998) replaced the A. mayaroensis Zone with the CF zones numbered in the descending order (CF1 is the latest Maastrichtian zone), which are based on other planktonic foraminiferids.…”

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

“…Finally, the A. mayaroensis Zone sensu Caron (1985) comprises, in stratigraphically ascending order, the following zones: upper part of CF4 Zone based on the FO of Raceguembelina fructicosa; CF3 Zone based on the FO of Pseudoguembelina hariaensis; CF2 Zone based on the LO of G. gansseri and the last CF1 Zone based on the FO of Plummerita hantkeninoides Bronnimann. The CF2 and CF1 zones correspond to the latest Maastrichtian greenhouse period from which the foraminiferal assemblages are dominated by dwarfed disaster species (as a result of the so-called Lilliput effect) in some volcanically affected areas (Keller & Abramovich 2009;Tantawy et al 2009). The CF2-1 zones time is also characterized by rapid decrease in surface, intermediate and deep foraminiferid species richness (Keller 2001 general, the whole latest Maastrichtian is considered as a time of climate disturbances, due to the global warming periods interrupted by global cooling, which resulted in pronounced sea-level changes and shifts in oceanic column temperature composition (Miller et al 2005(Miller et al , 2008MacLeod et al 2011).…”

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

“…Among them, the most problematic seems to be the topmost Maastrichtian planktonic foraminiferid Abathomphalus mayaroensis Zone, the upper boundary of which corresponds to the Cretaceous-Paleogene (K/Pg) boundary and can be used as a proxy for the boundary when the boundary layer with the iridium anomaly is not developed or preserved, for instance in a case of flysch deposits. It appears that the first and last occurrences of this important index species are controlled by Late Maastrichtian environmental changes (Huber & Watkins 1992;Keller & Abramovich 2009). Moreover, definition of the upper boundary of the A. mayaroensis Zone has changed many times since Caron (1985) proposed this zone as the total range zone of the index and eponym species Abathomphalus mayaroensis.…”

Section: Introductionmentioning

confidence: 99%

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Last occurrence of Abathomphalus mayaroensis (Bolli) foraminiferid index of the Cretaceous–Paleogene boundary: the calcareous nannofossil proof

Kędzierski¹,

Gasiński²,

Uchman³

2015

Geologica Carpathica

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Abstract:In the Gaj section (Polish Carpathians, Skole Nappe, Ropianka Formation), the Late Maastrichtian calcareous nannofossil biostratigraphy is compared with foraminiferal zonation based on the occurrence of the planktonic foraminiferid index species Abathomphalus mayaroensis. It appears that the LO of A. mayaroensis, which has been used previously in the studied section as the possible K/Pg boundary indicator is located below the boundary. The disappearance of A. mayaroensis along with other planktonic foraminiferids before the Cretaceous-Paleogene (K/Pg) boundary mass extinction event may be a consequence of the Late Maastrichtian rapid warming pulses. Moreover, the Paleogene age cannot be supported by the FO of the benthic foraminiferid Rzehakina fissistomata, because it first appears together with the nannofossil Ceratolithoides kamptneri (zonal marker for the latest Maastrichtian UC20c TP Zone). According to the present study, the whole studied section represents the lower Upper to the upper Upper Maastrichtian UC20b TP and UC20c TP nannofossil zones, so that it corresponds to the lower-middle part of the planktonic foraminiferal A. mayaroensis Zone, which, according to the scheme by Caron (1985), should extend up to the K/Pg boundary.

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Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

Section: Planktonic Foraminiferal Biostratigraphy Around the K/pg Boumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Last occurrence of Abathomphalus mayaroensis (Bolli) foraminiferid index of the Cretaceous–Paleogene boundary: the calcareous nannofossil proof

Kędzierski¹,

Gasiński²,

Uchman³

2015

Geologica Carpathica

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Environmental perturbations at the early Eocene ETM2, H2, and I1 events as inferred by Tethyan calcareous plankton (Terche section, northeastern Italy)

et al. 2016

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Several early Eocene hyperthermals have been recently investigated and characterized in terms of temperature anomalies and oceanographic changes. The effects of these climatic perturbations on biotic communities are much less constrained. Here we present new records from the Terche section (northeastern Italy) that, for the first time, integrates data on planktic foraminifera and calcareous nannofossils across three post‐Paleocene‐Eocene Thermal Maximum negative carbon isotope excursions (CIEs). The biomagnetostratigraphic framework generated at Terche allows us to confidently relate such CIEs to the Eocene Thermal Maximum 2 (ETM2), H2, and I1 events. Each of these events coincides with lithological anomalies characterized by significantly lower calcium carbonate content (marly units, MUs). We interpret these MUs as mainly linked to an effect of increased terrigenous dilution, as dissolution proxies do not display significant variations. Calcareous plankton assemblages change significantly across these events and radiolarians increase. Observed changes suggest that transient warming and environmental perturbations, though more intense during ETM2, occurred during each of the three investigated perturbations. Variations among calcareous plankton suggest increase in surface‐water eutrophication with respect to the pre‐event conditions, coupled with a weakening of the upper water‐column thermal stratification. Higher nutrient discharge was related to intensification of the hydrological cycle as a consequence of the warmer climate. These conditions persisted during the early CIE recovery, implying slower recovery rates for the environment and biota than for the carbon cycle.

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Changes in the depth habitat of the Oligocene planktic foraminifera (Dentoglobigerina venezuelana) induced by thermocline deepening in the eastern equatorial Pacific

et al. 2016

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Understanding planktic foraminiferal depth habitat along with consistent taxonomic concepts is key to accurate reconstruction of paleoceanographic records. The Oligocene‐Pliocene long‐ranging and widely distributed species Dentoglobigerina venezuelana lived in the mixed layer (shallower) during the early Oligocene, whereas the same species calcified at thermocline or subthermocline depths (deeper) during the late Oligocene and Miocene. The exact timing of the species' depth habitat change and its possible relationships with Oligocene climate dynamics remain unknown. Here we reveal isotopic records of D. venezuelana along with the Paragloborotalia siakensis group (a mixed‐layer dweller) by using sediments at Integrated Ocean Drilling Program Site U1334 in the eastern equatorial Pacific throughout the Oligocene. A two‐step depth habitat change of D. venezuelana is apparent: (1) from upper to lower mixed layer (~27.4 Ma) and (2) from lower mixed layer to thermocline depth (~26.3 Ma). In addition, the planktic foraminiferal faunal assemblage experienced a marked change from dominantly thermocline (deeper) species to abundant mixed‐layer (shallower) species, suggesting that depth habitat shifts of D. venezuelana were clearly related to thermocline deepening in the eastern equatorial Pacific. Comparison of the first isotopic shift (~27.4 Ma) at multiple sites (U1334, U1333, and 1218) revealed a southward depth habitat change of D. venezuelana within ~200 kyr, implying overall thermocline deepening with reduced steepness in the eastern equatorial Pacific. We consider that global warming conditions during the late Oligocene likely caused thermocline deepening with upwelling decrease in the eastern equatorial Pacific, guiding D. venezuelana to adapt to greater depths in the water column.

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Lilliput effect in late Maastrichtian planktic foraminifera: Response to environmental stress

Cited by 116 publications

References 68 publications

Last occurrence of Abathomphalus mayaroensis (Bolli) foraminiferid index of the Cretaceous–Paleogene boundary: the calcareous nannofossil proof

Last occurrence of Abathomphalus mayaroensis (Bolli) foraminiferid index of the Cretaceous–Paleogene boundary: the calcareous nannofossil proof

Environmental perturbations at the early Eocene ETM2, H2, and I1 events as inferred by Tethyan calcareous plankton (Terche section, northeastern Italy)

Changes in the depth habitat of the Oligocene planktic foraminifera (Dentoglobigerina venezuelana) induced by thermocline deepening in the eastern equatorial Pacific

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