DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/5836

Title: Isotopic paleobiology of some tertiary larger foraminifera from Kutch, India
Authors: SARASWATI, PK
KUMAR, A
PATRA, PK
BANERJI, RK
Keywords: stable isotopes
benthic foraminifera
algal symbiosis
Issue Date: 1997
Publisher: CUSHMAN FOUNDATION FORAMINIFERAL RES
Citation: JOURNAL OF FORAMINIFERAL RESEARCH, 27(1), 69-74
Abstract: The paleobiology of some Tertiary larger foraminifera from Kutch is inferred using oxygen and carbon isotopic data, Spiroclypeus and Heterostegina (having chamber-lets) show lower delta(13)C values than Nummulites and Assilina (having undivided chambers). This difference is attributed to algal endosymbionts for whom division of chambers is functionally advantageous, The isotopic data also support the view that pustules on the surface of some larger foraminifera developed to concentrate light for the benefit of endosymbionts. Isotopic variability is greater in megalospheric than in microspheric farms, indicating that the megalospheric forms are more tolerant of ecological variation than the microspheric ones, and this could be one of the reasons why they are more common in the geologic record, Similarly, variability in delta(18)O and delta(13)C isotopic values indicate that the family Nummulitidae is more stenotopic, whereas Lepidocyclinidae and Miogypsinidae appear to be more eurytopic. The order of extinction of the genera Assilina, Nummulites and Spiroclypeus also parallels the progressive decline in delta(13)C in their skeletal carbonates, This parallelism possibly indicates a greater role for endosymbionts in the evolution of larger foraminifera.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/5836
http://hdl.handle.net/10054/5836
ISSN: 0096-1191
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback