Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections
The mass extinction at the Cretaceous-Paleogene boundary is generally explained by a severe crisis in primary productivity, following a catastrophic bolide impact. Consistent with this scenario, Danian mollusk-dominated benthic shelf ecosystems of southern middle paleolatitudes (Neuquén Basin, Argen...
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todo:paper_00917613_v35_n3_p227_Aberhan2023-10-03T14:55:05Z Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections Aberhan, M. Weidemeyer, S. Kiessling, W. Scasso, R.A. Medina, F.A. Cretaceous-Paleogene boundary Ecology Mass extinction Productivity Southern Hemisphere Cretaceous-Paleogene boundary sections Macrofossil abundances Mass extinction Starvation-resistant Synecological attributes Animals Biology Ecology Ecosystems Geochronology Stratigraphy Geology Cretaceous fauna macrobenthos mass extinction mollusc nanoplankton paleoecology Paleogene paleolatitude primary production Southern Hemisphere Argentina Neuquen Basin South America The mass extinction at the Cretaceous-Paleogene boundary is generally explained by a severe crisis in primary productivity, following a catastrophic bolide impact. Consistent with this scenario, Danian mollusk-dominated benthic shelf ecosystems of southern middle paleolatitudes (Neuquén Basin, Argentina) are characterized by (1) a stratigraphically limited low in macrofossil abundances; (2) an increase in starvation-resistant, nonplanktotrophic deposit feeders and chemosymbionts; (3) a reduction in the average body size of individuals; and (4) individuals with inactive lifestyles being more common than in the late Maastrichtian. Return to pre-extinction conditions of the various synecological attributes occurred over unequal time spans, indicating that recovery was uncoordinated with respect to ecological traits. Global comparison of ecological patterns suggests that reduced food supply (1) was a controlling factor in both hemispheres; (2) affected macrobenthic marine faunas at various distances from the Chiexulub impact site; and (3) was more effective in silicielastic environments as compared to oligotrophic carbonate settings. © 2007 Geological Society of America. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Medina, F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00917613_v35_n3_p227_Aberhan |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cretaceous-Paleogene boundary Ecology Mass extinction Productivity Southern Hemisphere Cretaceous-Paleogene boundary sections Macrofossil abundances Mass extinction Starvation-resistant Synecological attributes Animals Biology Ecology Ecosystems Geochronology Stratigraphy Geology Cretaceous fauna macrobenthos mass extinction mollusc nanoplankton paleoecology Paleogene paleolatitude primary production Southern Hemisphere Argentina Neuquen Basin South America |
| spellingShingle |
Cretaceous-Paleogene boundary Ecology Mass extinction Productivity Southern Hemisphere Cretaceous-Paleogene boundary sections Macrofossil abundances Mass extinction Starvation-resistant Synecological attributes Animals Biology Ecology Ecosystems Geochronology Stratigraphy Geology Cretaceous fauna macrobenthos mass extinction mollusc nanoplankton paleoecology Paleogene paleolatitude primary production Southern Hemisphere Argentina Neuquen Basin South America Aberhan, M. Weidemeyer, S. Kiessling, W. Scasso, R.A. Medina, F.A. Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| topic_facet |
Cretaceous-Paleogene boundary Ecology Mass extinction Productivity Southern Hemisphere Cretaceous-Paleogene boundary sections Macrofossil abundances Mass extinction Starvation-resistant Synecological attributes Animals Biology Ecology Ecosystems Geochronology Stratigraphy Geology Cretaceous fauna macrobenthos mass extinction mollusc nanoplankton paleoecology Paleogene paleolatitude primary production Southern Hemisphere Argentina Neuquen Basin South America |
| description |
The mass extinction at the Cretaceous-Paleogene boundary is generally explained by a severe crisis in primary productivity, following a catastrophic bolide impact. Consistent with this scenario, Danian mollusk-dominated benthic shelf ecosystems of southern middle paleolatitudes (Neuquén Basin, Argentina) are characterized by (1) a stratigraphically limited low in macrofossil abundances; (2) an increase in starvation-resistant, nonplanktotrophic deposit feeders and chemosymbionts; (3) a reduction in the average body size of individuals; and (4) individuals with inactive lifestyles being more common than in the late Maastrichtian. Return to pre-extinction conditions of the various synecological attributes occurred over unequal time spans, indicating that recovery was uncoordinated with respect to ecological traits. Global comparison of ecological patterns suggests that reduced food supply (1) was a controlling factor in both hemispheres; (2) affected macrobenthic marine faunas at various distances from the Chiexulub impact site; and (3) was more effective in silicielastic environments as compared to oligotrophic carbonate settings. © 2007 Geological Society of America. |
| format |
JOUR |
| author |
Aberhan, M. Weidemeyer, S. Kiessling, W. Scasso, R.A. Medina, F.A. |
| author_facet |
Aberhan, M. Weidemeyer, S. Kiessling, W. Scasso, R.A. Medina, F.A. |
| author_sort |
Aberhan, M. |
| title |
Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| title_short |
Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| title_full |
Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| title_fullStr |
Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| title_full_unstemmed |
Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections |
| title_sort |
faunal evidence for reduced productivity and uncoordinated recovery in southern hemisphere cretaceous-paleogene boundary sections |
| url |
http://hdl.handle.net/20.500.12110/paper_00917613_v35_n3_p227_Aberhan |
| work_keys_str_mv |
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1807317828318003200 |