Show simple item record

dc.contributor.authorNigam, R.
dc.contributor.authorRao, A.S.
dc.date.accessioned2006-10-24T04:19:53Z
dc.date.available2006-10-24T04:19:53Z
dc.date.issued1989
dc.identifier.citationJournal of The Palaeontological Society of India, vol.34, 79-82p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/445
dc.description.abstractChanges in coiling direction in foraminifera have been used extensively as proxy data for paleoclimates. However, most of the studies centred around planktonic foraminifera, and various causes (including reproductive mode) were suggested for coiling direction changes. The relationship between mode of reproduction and coiling directions in benthic foraminifera is explored. Benthic foraminiferal species Cavarotalia annectens (Paarker & Jones) in 58 samples obtained from a core off Karwar, west coast of India, show sinistral and dextral coiling and also dimorphic (sexual and asexual) mode of reproduction. Proloculus size has been taken as indicator of change in reproductive behaviour. Results indicate that mean proloculus size and ratios of dextral/sinistral forms are inversely proportional (r = 0.49) and relationship is significant at 95% level of confidence (r = 0.29). It is therefore proposed that (1) coiling direction in benthic foraminifera are related to mode of reproduction and (2) forms with smaller proloculus have a preference to coil dextrally. This study may have significant consequences for interpretation of paleoclimatic records from shallow regions. However, these inferences need to be confirmed by additional culture and faunal studies with other species of benthic foraminifera
dc.format.extent77206 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherThe Palaeontological Society of India
dc.rightsThis full-text version of the paper hosted with the permission
dc.subjectplanktonic foraminifera
dc.subjectcoiling directions
dc.titleThe intriguing relationship between coiling direction and reproductive mode in benthic foraminifera
dc.typeJournal Article


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record