Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress,Geological Journal

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Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress
Geological Journal ( IF 1.4 ) Pub Date : 2020-12-05 , DOI: 10.1002/gj.4049
Ramkumar Muthuvairavasamy ₁ , Numair Ahmed Siddiqui _{2,

3} , Jyotsana Rai ₄ , Bhawanisingh G. Desai ₅ , David Menier ₆

Affiliation

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.

中文翻译：

印度南部Cauvery盆地Kallankurichchi组的机会定居者：对马斯特里赫特环境压力的影响

Serpulids是生活在钙质管中的海洋滤食性蛛网膜动物。它们的分布，定植和增殖取决于包括能量条件在内的物理环境变量。本文记录了印度南部Cauvery盆地Ariyalur组下Maastrichtian Kallankurichchi组下富含Ophiomorpha沉积单元的机会定殖痕迹化石上SERPUlid菌落的发生，并将它们与生态系统动态联系起来，作为喜人和喜庆变化的函数其他相对海平面变化以及随之而来的环境参数变化。目前的观察表明，跨越Kattupiringiyam Inoceramus之间的边界，动物组成，多样性和种群发生了周期性变化。Kallankurichchi组的石灰岩成员和Tancem生物质层成员。边界标志着从低能量水到高能量水的显着变化，因此由机会主义社区取代了过滤器喂养社区。Ophiomorpha irregulaire的机会定居者/痕迹创造者占领了因海平面变化而腾空的生态空间。跨界动物群联系的系统研究表明，大量的蛇纹草突然出现地表以上的菌落（即，在生态系统条件发生变化之后），并增强了底栖生物中无聊的海绵的强度。这意味着由新的环境条件引起的变化为机会定居者以及寄生和共生生物提供了支持。Gryphaea种群显着减少，逐渐被Alectryonia，Exogyra和Terebratula取代也有记录。这些变化共同表明由于相对的海平面变化和伴随的生态条件而引起的普遍环境压力，机会定居者和寄生生物对此做出了积极反应，而原生生物的种群却在减少，并被迫进行了寄生虫入侵。

更新日期：2020-12-05

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