globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.05.003
论文题名:
Bioerosion structures in Crepidula (Mollusca, Gastropoda) as indicators of latitudinal palaeoenvironmental changes: Example from the marine Quaternary of Argentina
作者: Sebastián R.; Marina A.; Ester F.; Karen D.; Ignacio C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 439
起始页码: 63
结束页码: 78
语种: 英语
英文关键词: Geographical variations ; Holocene ; Ichnodiversity ; Palaeoceanographical changes ; Pleistocene ; Southwestern Atlantic
英文摘要: Late Quaternary marine skeletal concentrations from Argentina are rich in molluscs exhibiting a great variety of bioerosion structures. The shells of Crepidula, a characteristic gastropod occurring along more than 2000. km of coastline between the Río de La Plata margin and southern Patagonia, show traces of dwelling, predation and anchoring activities made by porifers, bryozoans, annelids, other gastropods and brachiopods. Caulostrepsis, Entobia, Maeandropolydora, Iramena, Oichnus, Finichnus, Pennatichnus, Pinaceocladichnus, Podichnus and Renichnus occur on the outer shell surface. Finichnus and Oichnus are the only traces present along the entire area and the full time span considered. The most characteristic structures are produced by bryozoans, polychaetes and predatory gastropods. Traces produced by annelids and predatory gastropods occur preferentially in the central shell sector, where predators gained access to the soft parts of the prey. By contrast, encrusting or branching bryozoan colonies are widely distributed as they can attach to any sector regardless of shell features available. No strict correlation is evident between ichnodiversity and either time or latitude, but ichnodiversity is linked to local oceanographical/biotic controls. For Patagonia, with a great majority of ichnotaxa made by bryozoans, the general trend of higher bioerosion degree and ichnodiversity at higher latitudes is controlled by sea surface temperature/productivity: for the modern and the Holocene, several ichnodiversity peaks match with well-constrained conditions (substrate, salinity, thermal fronts). By contrast, this does not hold for the Pleistocene: dissimilar conditions probably prevailed, especially during the Last Interglacial (colder waters richer in nutrients). © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68777
Appears in Collections:过去全球变化的重建

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作者单位: Centro de Investigaciones Geológicas, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Calle 1 No 644, La Plata, Argentina; Conicet, CABA, Av. Rivadavia 1917, Buenos Aires, Argentina; Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Edificio Institutos, Cátedras y Laboratorios, Laboratorio 6, calle 64 No 3, La Plata, Argentina; Departamento de Geología, Universidad Nacional del Sur, San Juan 670, Bahía Blanca, Argentina

Recommended Citation:
Sebastián R.,Marina A.,Ester F.,et al. Bioerosion structures in Crepidula (Mollusca, Gastropoda) as indicators of latitudinal palaeoenvironmental changes: Example from the marine Quaternary of Argentina[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,439
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