Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts
Biometric measurements of Mesozoic coccoliths (coccolith length and width) have been used in short-term biostratigraphic, taxonomic and palaeoecologic studies, but until now, not over longer time scales. Here, we present a long time-series study (~30. million years) for the Upper Cretaceous, which a...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:1462968 2023-05-15T17:41:32+02:00 Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts Linnert, C Mutterlose, J Bown, PR 2014 http://discovery.ucl.ac.uk/1462968/ unknown Revue de Micropaleontologie , 57 (4) 125 - 140. (2014) Article 2014 ftucl 2015-03-05T23:40:23Z Biometric measurements of Mesozoic coccoliths (coccolith length and width) have been used in short-term biostratigraphic, taxonomic and palaeoecologic studies, but until now, not over longer time scales. Here, we present a long time-series study (~30. million years) for the Upper Cretaceous, which aims to identify broad trends in coccolith size and to understand the factors governing coccolith size change over long time scales. We have generated biometric data for the dominant Upper Cretaceous coccolith groups, Broinsonia/Arkhangelskiella, Prediscosphaera, Retecapsa and Watznaueria, from 36 Cenomanian-Maastrichtian (100.5-66. Ma) samples from Goban Spur in the northeast Atlantic (DSDP Site 549). These data show that the coccolith sizes within Prediscosphaera, Retecapsa and Watznaueria were relatively stable through the Late Cretaceous, with mean size variation less than 0.7. μm. Within the Broinsonia/Arkhangelskiella group there was more pronounced variation, with a mean size increase from ~6 μm in the Cenomanian to ~10 μm in the Campanian. This significant change in mean size was largely driven by evolutionary turnover (species origination and extinctions), and, in particular, the appearance of larger species/subspecies (Broinsonia parca parca, Broinsonia parca constricta, Arkhangelskiella cymbiformis) in the early Campanian, replacing smaller species, such as Broinsonia signata and Broinsonia enormis. Shorter-term size fluctuations within Broinsonia/Arkhangelskiella, observed across the Late Cenomanian-Turonian and Late Campanian-Maastrichtian intervals, may, however, reflect changing palaeoenvironmental conditions, such as sea surface temperature and nutrient availability. Article in Journal/Newspaper Northeast Atlantic University College London: UCL Discovery |
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University College London: UCL Discovery |
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ftucl |
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description |
Biometric measurements of Mesozoic coccoliths (coccolith length and width) have been used in short-term biostratigraphic, taxonomic and palaeoecologic studies, but until now, not over longer time scales. Here, we present a long time-series study (~30. million years) for the Upper Cretaceous, which aims to identify broad trends in coccolith size and to understand the factors governing coccolith size change over long time scales. We have generated biometric data for the dominant Upper Cretaceous coccolith groups, Broinsonia/Arkhangelskiella, Prediscosphaera, Retecapsa and Watznaueria, from 36 Cenomanian-Maastrichtian (100.5-66. Ma) samples from Goban Spur in the northeast Atlantic (DSDP Site 549). These data show that the coccolith sizes within Prediscosphaera, Retecapsa and Watznaueria were relatively stable through the Late Cretaceous, with mean size variation less than 0.7. μm. Within the Broinsonia/Arkhangelskiella group there was more pronounced variation, with a mean size increase from ~6 μm in the Cenomanian to ~10 μm in the Campanian. This significant change in mean size was largely driven by evolutionary turnover (species origination and extinctions), and, in particular, the appearance of larger species/subspecies (Broinsonia parca parca, Broinsonia parca constricta, Arkhangelskiella cymbiformis) in the early Campanian, replacing smaller species, such as Broinsonia signata and Broinsonia enormis. Shorter-term size fluctuations within Broinsonia/Arkhangelskiella, observed across the Late Cenomanian-Turonian and Late Campanian-Maastrichtian intervals, may, however, reflect changing palaeoenvironmental conditions, such as sea surface temperature and nutrient availability. |
format |
Article in Journal/Newspaper |
author |
Linnert, C Mutterlose, J Bown, PR |
spellingShingle |
Linnert, C Mutterlose, J Bown, PR Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
author_facet |
Linnert, C Mutterlose, J Bown, PR |
author_sort |
Linnert, C |
title |
Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
title_short |
Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
title_full |
Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
title_fullStr |
Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
title_full_unstemmed |
Biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
title_sort |
biometry of upper cretaceous (cenomanian-maastrichtian) coccoliths-a record of long-term stability and interspecies size shifts |
publishDate |
2014 |
url |
http://discovery.ucl.ac.uk/1462968/ |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Revue de Micropaleontologie , 57 (4) 125 - 140. (2014) |
_version_ |
1766143151475523584 |