Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress DOI
Muthuvairavasamy Ramkumar, Numair Ahmed Siddiqui,

Jyotsana Rai

и другие.

Geological Journal, Год журнала: 2020, Номер 56(4), С. 2060 - 2071

Опубликована: Дек. 5, 2020

Serpulids are marine filter‐feeding annelids that live in calcareous tubes. Their distribution, colonization, and proliferation dependent on physical environmental variables, including energy conditions. This article documents the occurrences of serpulid colonies over opportunistic colonizing trace fossil Ophiomorpha ‐rich sedimentary unit Lower Maastrichtian Kallankurichchi Formation Ariyalur Group, Cauvery Basin, South India links them with ecosystem dynamics, as a function changes eustatic other relative sea‐level attendant variations parameters. Present observations indicate episodic faunal composition, diversity, population, across boundary between Kattupiringiyam Inoceramus limestone Member Tancem biostromal Formation. The marked significant change from low‐moderate energy, to high‐energy waters, thus replacing community by an community. colonizers/trace makers irregulaire occupied ecospaces vacated changes. Systematic studies association sudden appearance populations Serpula above surface (i.e., after conditions) enhancement intensity sponge boring benthic organisms. means brought about newer conditions were supportive for colonizers followed parasitic commensalic Significant reduction Gryphaea population was increasingly replaced Alectryonia , Exogyra Terebratula is also documented. These changes, collectively, prevalent stress due ecological conditions, which, organisms responded positively, while native dwindled forced invasions.

Язык: Английский

Temporal scales, sampling designs and age distributions in marine conservation palaeobiology DOI Creative Commons
Adam Tomášových, Stefano Dominici, Rafał Nawrot

и другие.

Geological Society London Special Publications, Год журнала: 2023, Номер 529(1), С. 1 - 39

Опубликована: Март 29, 2023

Abstract Conservation palaeobiology informs conservation and restoration of ecosystems by using the fossil record to discriminate between baseline novel states assess ecosystem response perturbations. Variability in time-scale palaeobiological data can generate patterns that either exaggerate or mute magnitude biotic changes. We identify two approaches remedy challenges associated with mixing post-impact transformation stratigraphic depth time. First, combining surface death assemblages both (1) preserved subsurface historical layers (2) living better resolve nature shifts than within-core surveys live–dead analyses alone. Second, post-mortem age distributions skeletal particles their preservation are not only informative about resolution time averaging but also timing changes abundance producers. High youngest cohorts is a null expectation disintegration burial dynamic. When this dynamic accounted for, benthic invertebrates from Holocene sediments often reveal high volatility, prolonged turn-offs production pervasive regime obscured raw record.

Язык: Английский

Процитировано

20
Brachiopod Fauna from the Deep Mediterranean Sea: Distribution Patterns and Ecological Preferences DOI Creative Commons
Margherita Toma, Francesco Enrichetti, Giorgio Bavestrello

и другие.

Diversity, Год журнала: 2022, Номер 14(9), С. 753 - 753

Опубликована: Сен. 12, 2022

Compared to their fossil counterparts, living brachiopods are investigated far less often, due occurrence in remote environments such as dark caves or deep environments. Due the scarcity of studies targeting situ brachiopods’ populations, large-scale information on distribution and ecological preferences is still lacking, especially hardgrounds. The extensive employment remotely operated vehicles (ROVs), however, has opened up chance better explore this taxon’s diversity ecology mesophotic bathyal zones. analysis over 600 h video footage collected from 624 sites, 40 m 1825 m, located along Ligurian Tyrrhenian coasts Italy Sicily Channel, allowed for a investigation. four identified species, Novocrania anomala, Gryphus vitreus, Megerlia truncata Terebratulina retusa, emerged common macrofaunal components explored habitats, between 150 250 with high occurrences northern areas, offshore seamounts. All species can form dense aggregations individuals, M. showing densest populations steep rocky terraces (up 773 individuals m−2). Except G. only also recorded soft bottoms, others were found exclusively hardgrounds, N. anomala peculiar ability exploit anthropogenic substrates terracotta amphorae. No stable species-specific associations noted, even if numerous frequently observed together. Although do not show conspicuous tridimensionality large filter-feeders, substrate occupancy role pelagic–benthic processes support importance deep-sea Mediterranean ecosystems.

Язык: Английский

Процитировано

5
A Miocene (Tortonian, Menorca, Spain) benthic macrofauna preserved in a phosphatic hardground: A difficult but invaluable record of upwelling palaeoenvironments DOI
Robin I. Knight

Proceedings of the Geologists Association, Год журнала: 2024, Номер 135(3), С. 282 - 300

Опубликована: Апрель 25, 2024

Язык: Английский

Процитировано

0
Opportunistic colonizers in the Kallankurichchi Formation, Cauvery Basin, South India: Implications on Maastrichtian environmental stress DOI
Muthuvairavasamy Ramkumar, Numair Ahmed Siddiqui,

Jyotsana Rai

и другие.

Geological Journal, Год журнала: 2020, Номер 56(4), С. 2060 - 2071

Опубликована: Дек. 5, 2020

Serpulids are marine filter‐feeding annelids that live in calcareous tubes. Their distribution, colonization, and proliferation dependent on physical environmental variables, including energy conditions. This article documents the occurrences of serpulid colonies over opportunistic colonizing trace fossil Ophiomorpha ‐rich sedimentary unit Lower Maastrichtian Kallankurichchi Formation Ariyalur Group, Cauvery Basin, South India links them with ecosystem dynamics, as a function changes eustatic other relative sea‐level attendant variations parameters. Present observations indicate episodic faunal composition, diversity, population, across boundary between Kattupiringiyam Inoceramus limestone Member Tancem biostromal Formation. The marked significant change from low‐moderate energy, to high‐energy waters, thus replacing community by an community. colonizers/trace makers irregulaire occupied ecospaces vacated changes. Systematic studies association sudden appearance populations Serpula above surface (i.e., after conditions) enhancement intensity sponge boring benthic organisms. means brought about newer conditions were supportive for colonizers followed parasitic commensalic Significant reduction Gryphaea population was increasingly replaced Alectryonia , Exogyra Terebratula is also documented. These changes, collectively, prevalent stress due ecological conditions, which, organisms responded positively, while native dwindled forced invasions.

Язык: Английский

Процитировано

3