Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors
Size measurements of the calcareous nannofossil taxon Discoaster multiradiatus were carried out across the Paleocene-Eocene Thermal Maximum (PETM) in Ocean Drilling Program Holes 690B (Maud Rise, Weddell Sea) and 1209B (Shatsky Rise, Pacific Ocean). Morphometric investigations show that D. multiradi...
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ftunivmilanoair:oai:air.unimi.it:2434/40042 2024-02-04T10:05:10+01:00 Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors B. De Bernardi E. Erba F. Tremolada B. De Bernardi F. Tremolada E. Erba 2007 http://hdl.handle.net/2434/40042 ita ita Geoitalia 2007 volume:10 firstpage:1474 journal:EPITOME http://hdl.handle.net/2434/40042 Discoaster multiradiatus PETM Settore GEO/01 - Paleontologia e Paleoecologia info:eu-repo/semantics/article 2007 ftunivmilanoair 2024-01-09T23:15:51Z Size measurements of the calcareous nannofossil taxon Discoaster multiradiatus were carried out across the Paleocene-Eocene Thermal Maximum (PETM) in Ocean Drilling Program Holes 690B (Maud Rise, Weddell Sea) and 1209B (Shatsky Rise, Pacific Ocean). Morphometric investigations show that D. multiradiatus specimens are generally larger at ODP Site 1209 rather than at ODP Site 690. A small increase in size of this species is recorded at ODP Site 1209, whereas significant variations characterize ODP Site 690. A marked shift in diameter size was observed in the lower portion of the PETM at ODP Site 690, which coincides with the onset and the peak of the Carbon Isotope Excursion (CIE). The occurrence of the largest specimens of D. multiradiatus at the onset and the peak of the CIE coincides with an inferred massive introduction of carbon dioxide, increasing temperature, and a likely drop in primary productivity. This contradicts the size-reduction hypothesis under excessive pCO2 levels. Instead, the size increase of D. multiradiatus could be the result of a significant influx of larger-sized specimens from lower latitudes during the warmest and the most nutrient-depleted interval of the PETM. In addition, the shift in size recorded in the lower part of the PETM could result from the occurrence of a new echophenotype that occupied short-lived ecological niches triggered by changes in water stratification, temperature, and primary productivity Article in Journal/Newspaper Weddell Sea The University of Milan: Archivio Istituzionale della Ricerca (AIR) Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Pacific Weddell Weddell Sea |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
Italian |
topic |
Discoaster multiradiatus PETM Settore GEO/01 - Paleontologia e Paleoecologia |
spellingShingle |
Discoaster multiradiatus PETM Settore GEO/01 - Paleontologia e Paleoecologia B. De Bernardi E. Erba F. Tremolada Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
topic_facet |
Discoaster multiradiatus PETM Settore GEO/01 - Paleontologia e Paleoecologia |
description |
Size measurements of the calcareous nannofossil taxon Discoaster multiradiatus were carried out across the Paleocene-Eocene Thermal Maximum (PETM) in Ocean Drilling Program Holes 690B (Maud Rise, Weddell Sea) and 1209B (Shatsky Rise, Pacific Ocean). Morphometric investigations show that D. multiradiatus specimens are generally larger at ODP Site 1209 rather than at ODP Site 690. A small increase in size of this species is recorded at ODP Site 1209, whereas significant variations characterize ODP Site 690. A marked shift in diameter size was observed in the lower portion of the PETM at ODP Site 690, which coincides with the onset and the peak of the Carbon Isotope Excursion (CIE). The occurrence of the largest specimens of D. multiradiatus at the onset and the peak of the CIE coincides with an inferred massive introduction of carbon dioxide, increasing temperature, and a likely drop in primary productivity. This contradicts the size-reduction hypothesis under excessive pCO2 levels. Instead, the size increase of D. multiradiatus could be the result of a significant influx of larger-sized specimens from lower latitudes during the warmest and the most nutrient-depleted interval of the PETM. In addition, the shift in size recorded in the lower part of the PETM could result from the occurrence of a new echophenotype that occupied short-lived ecological niches triggered by changes in water stratification, temperature, and primary productivity |
author2 |
B. De Bernardi F. Tremolada E. Erba |
format |
Article in Journal/Newspaper |
author |
B. De Bernardi E. Erba F. Tremolada |
author_facet |
B. De Bernardi E. Erba F. Tremolada |
author_sort |
B. De Bernardi |
title |
Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
title_short |
Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
title_full |
Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
title_fullStr |
Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
title_full_unstemmed |
Morphometric changes of the calcareous nannofossil taxon Discoaster multiradiatus across the Paleocene-Eocene Thermal Maximum: biotic and abiotic factors |
title_sort |
morphometric changes of the calcareous nannofossil taxon discoaster multiradiatus across the paleocene-eocene thermal maximum: biotic and abiotic factors |
publishDate |
2007 |
url |
http://hdl.handle.net/2434/40042 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Maud Rise Pacific Weddell Weddell Sea |
geographic_facet |
Maud Rise Pacific Weddell Weddell Sea |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
Geoitalia 2007 volume:10 firstpage:1474 journal:EPITOME http://hdl.handle.net/2434/40042 |
_version_ |
1789974169167855616 |