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Abstract:

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.

Registro:

Documento: Artículo
Título:Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections
Autor:Aberhan, M.; Weidemeyer, S.; Kiessling, W.; Scasso, R.A.; Medina, F.A.
Filiación:Museum für Naturkunde, Humboldt-Universität Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany
Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave: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
Año:2007
Volumen:35
Número:3
Página de inicio:227
Página de fin:230
DOI: http://dx.doi.org/10.1130/G23197A.1
Título revista:Geology
Título revista abreviado:Geology
ISSN:00917613
CODEN:GLGYB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v35_n3_p227_Aberhan

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Citas:

---------- APA ----------
Aberhan, M., Weidemeyer, S., Kiessling, W., Scasso, R.A. & Medina, F.A. (2007) . Faunal evidence for reduced productivity and uncoordinated recovery in Southern Hemisphere Cretaceous-Paleogene boundary sections. Geology, 35(3), 227-230.
http://dx.doi.org/10.1130/G23197A.1
---------- CHICAGO ----------
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" . Geology 35, no. 3 (2007) : 227-230.
http://dx.doi.org/10.1130/G23197A.1
---------- MLA ----------
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" . Geology, vol. 35, no. 3, 2007, pp. 227-230.
http://dx.doi.org/10.1130/G23197A.1
---------- VANCOUVER ----------
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. Geology. 2007;35(3):227-230.
http://dx.doi.org/10.1130/G23197A.1