eprintid: 15081
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/50/81
datestamp: 2023-11-10 03:29:41
lastmod: 2023-11-10 03:29:41
status_changed: 2023-11-10 01:58:35
type: article
metadata_visibility: show
creators_name: Muthuvairavasamy, R.
creators_name: Siddiqui, N.A.
creators_name: Rai, J.
creators_name: Desai, B.G.
creators_name: Menier, D.
title: Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress
ispublished: pub
keywords: annelid; Cretaceous; environmental stress; Maastrichtian; parasite; sedimentology, Cauvery Basin; India, Annelida; Exogyra; Gryphaea; Inoceramus; Ophiomorpha irregulaire; Porifera
note: cited By 1
abstract: Serpulids are marine filter-feeding annelids that live in calcareous tubes. Their distribution, colonization, and proliferation are dependent on physical environmental variables, including energy conditions. This article documents the occurrences of serpulid colonies over opportunistic colonizing trace fossil of Ophiomorpha-rich sedimentary unit in the Lower Maastrichtian Kallankurichchi Formation of the Ariyalur Group, Cauvery Basin, South India and links them with ecosystem dynamics, as a function of changes in eustatic and other relative sea-level changes and attendant variations in environmental parameters. Present observations indicate episodic changes in faunal composition, diversity, and population, across the boundary between Kattupiringiyam Inoceramus limestone Member and Tancem biostromal Member of the Kallankurichchi Formation. The boundary marked a significant change from low-moderate energy, to high-energy waters, thus replacing a filter-feeding community by an opportunistic community. The opportunistic colonizers/trace makers of Ophiomorpha irregulaire occupied the ecospaces vacated by the sea-level changes. Systematic studies of faunal association across the boundary indicate a sudden appearance of significant populations of Serpula colonies above the surface (i.e., after the changes in ecosystem conditions) and enhancement of intensity of sponge boring in benthic organisms. This means that the changes brought about by the newer environmental conditions were supportive for opportunistic colonizers followed by parasitic and commensalic organisms. Significant reduction of Gryphaea population that was increasingly replaced by Alectryonia, Exogyra, and Terebratula is also documented. These changes, collectively, indicate prevalent environmental stress due to relative sea-level variations and attendant ecological conditions, to which, the opportunistic colonizers and parasitic organisms responded positively, while the native organisms dwindled in population and were forced to parasitic invasions. © 2020 John Wiley & Sons Ltd.
date: 2021
publisher: John Wiley and Sons Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097060671&doi=10.1002%2fgj.4049&partnerID=40&md5=71778dcb352ea414913325edd880cdaa
id_number: 10.1002/gj.4049
full_text_status: none
publication: Geological Journal
volume: 56
number: 4
pagerange: 2060-2071
refereed: TRUE
issn: 00721050
citation:   Muthuvairavasamy, R. and Siddiqui, N.A. and Rai, J. and Desai, B.G. and Menier, D.  (2021) Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress.  Geological Journal, 56 (4).  pp. 2060-2071.  ISSN 00721050