Temporal scales, sampling designs and age distributions in marine conservation palaeobiology

Geological Society London Special Publications, Journal Year: 2023, Volume and Issue: 529(1), P. 1 - 39

Published: March 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.

Language: Английский

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The quality of the fossil record across higher taxa: compositional fidelity of phyla and classes in benthic marine associations

PeerJ, Journal Year: 2023, Volume and Issue: 11, P. e15574 - e15574

Published: July 11, 2023

Although the fossil record preserves a wealth of historical data about past ecosystems, current paradigm, which postulates that fossils provide faithful archives ecological information, stems from research primarily focused on single group organisms known for their high fossilization potential: molluscs. Here, we quantify fidelity higher taxa (six phyla and 11 classes) by comparing live communities sympatric dead remains (death assemblages) using comprehensive surveys benthic marine invertebrates coastal habitats in North Carolina (U.S.A). We found although community composition differed between two assemblages across classes, these differences were predictable with an overabundance robust more preservable groups. In addition, molluscs appear to be excellent proxy all when tracking spatio-temporal patterns shifts structure variety metrics, including measures α , γ β diversity/evenness. This suggests despite filters imposed differential preservation time-averaging, is likely reliable respect relative comparisons diversity shallow paleocommunities. consistent previous work indicating death can yield estimates adequate assessing variability ecosystems existed under natural, pre-anthropogenic conditions.

Language: Английский

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Taphonomic damage of molluscan shells in the Nile Delta under natural and anthropogenic sources of environmental variability

Journal of African Earth Sciences, Journal Year: 2023, Volume and Issue: 210, P. 105159 - 105159

Published: Dec. 17, 2023

Language: Английский

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The first records of eleven species of the genus Megaselia Rondani, 1856 from Morocco (Diptera, Phoridae)

Check List, Journal Year: 2024, Volume and Issue: 20(2), P. 510 - 517

Published: March 25, 2024

We provide new records of scuttle flies, family Phoridae (Diptera), from Morocco, which has been very little studied. Eleven phorid species belonging to the immense genus Megaselia Rondani, 1856 are newly reported country, increasing number known in Morocco 12, and 14. Information on distribution ecology each is provided.

Language: Английский

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Miocene tropical storms: Carbonate framework approaches and geochemistry proxies in a reservoir model

Marine and Petroleum Geology, Journal Year: 2023, Volume and Issue: 154, P. 106333 - 106333

Published: May 24, 2023

Language: Английский

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LITHOLOGY CONTROLS AMMONOID SIZE DISTRIBUTIONS

Palaios, Journal Year: 2022, Volume and Issue: 37(12), P. 744 - 754

Published: Dec. 29, 2022

ABSTRACT Body-size distributions of organisms across environments in space and time are a powerful source information on ecological evolutionary processes. However, most studies only focus selected parameters size (e.g., central tendency or extremes) rarely take into account entire how they affected by the collection style facies. Here we analyze impact facies, region, taxonomy, over using diameter as proxy Late Devonian ammonoids their entirety non-metric multidimensional scaling PERMANOVA based Kolmogorov distance. The effects then compared with mean sizes. In all analyses, lithology was dominant effect, sizes greater 59% marls 33% limestones, to black shales. effect complete sampling decrease 11%. Kurtosis an important parameter differentiating distributions, platykurtic leptokurtic suggesting that this may reflect different degrees averaging. Most were positively skewed, but strongly marls. Complete led skewness values close zero (symmetrical distributions) high kurtosis. Samples from higher paleolatitudes average smaller, contained outliers largest sizes, highlighting need distributions. Lithology differences be accounted for when evaluating (polar gigantism) (Lilliput effect). Similarly, facies affect species determination.

Language: Английский

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The Distribution Pattern of Marine Bivalve Death Assemblage From the Western Margin of Bay of Bengal and Its Oceanographic Determinants

Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8

Published: June 4, 2021

The global pattern of shallow marine biodiversity is constructed primarily using the data from extra-tropical sites. A severe knowledge gap in benthic diversity exists for tropical Indian Ocean, especially along coastline peninsular India. Latitudinal gradient (LBG)—a poleward decrease diversity, even though accepted as a pervasive pattern, often differs regional trends. Although several oceanographic variables are known to influence patterns, their relative effect shaping community seas remains unclear. east coast India bordering Bay Bengal (BoB) presents 2,500 km stretch (8–22°N) with spatial variation parameters including freshwater mixing, primary productivity, temperature, and shelf area. Here, we documented bivalve distribution spatially-temporally averaged beach samples evaluated relationship variables. Our reveal existence highly diverse fauna, comparable other Overall species composition reflects typical assemblage dominated by Veneridae but shows an uncharacteristically low proportion Tellinidae Lucinidae. latitudinal mid-latitude drop at around 14°N—a inconsistent prediction (LBG). functional groups infauna (65%), unattached (69%), suspension feeders (87%). There only slight difference between southern northern sites pointing predominantly continuous circulation considerable mixing within BoB. Productivity range, area, salinity emerge best predictors richness. All environmental together explain across bins satisfactorily. no distinct nature comparison Indo-Malayan hotspot; proximity this hotspot biological exchange it may have contributed high fauna. study highlights complex interplay multiple determining benthos scale generating patterns that odds trends such LBG.

Language: Английский

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Millennial-scale changes in abundance of brachiopods in bathyal environments detected by postmortem age distributions in death assemblage (Bari Canyon, Adriatic Sea)

Geological Society London Special Publications, Journal Year: 2022, Volume and Issue: 529(1), P. 153 - 174

Published: Oct. 6, 2022

Abstract Inferring the composition of pre-Anthropocene baseline communities on basis death assemblages (DAs) preserved in a surface mixed layer requires discriminating among recently-dead shells sourced by living populations and older from extirpated populations. Here, we assess distribution postmortem ages DA formed brachiopod Gryphus vitreus at 580 m depth Bari Canyon (Adriatic Sea), with no individuals collected alive. The exhibits millennial time averaging (inter-quartile range = 1250 years) two modes abundance 500 1750 years BP. As high species time-averaged DAs can reflect passive accumulation low standing population density, reconstruct changes annual density maxima detected estimates per-specimen disintegration rate. We find that adults (>20 mm) achieved densities least 10–20 individuals/m 2 (assuming lifespan is 10 years), pulses were thus associated past, followed decline over last few centuries. infer bathyal volatile during Late Holocene, brachiopods sensitive to siltation was induced temporal sediment dispersal into due deforestation climatic changes.

Language: Английский

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THE INFLUENCE OF SEASONALITY ON LIVE-DEAD FIDELITY OF CAENOGASTROPODA FROM THE NORTHERN COAST OF SÃO PAULO STATE, BRAZIL

Palaios, Journal Year: 2024, Volume and Issue: 39(10), P. 384 - 392

Published: Oct. 24, 2024

Abstract Environmental seasonality produces variations in the distribution and structure of biodiversity throughout year. Understanding how ecological fidelity is affected by these allows taphonomists to assess not only degree fidelity, but also identify which seasonal assemblage fossil record reflects. The present study aims evaluate gastropod mollusks from a tropical soft substrate environment (Ubatuba Bay, Brazil) collected over 12-month interval. Samples were at four sites within bathymetric interval 5–15 m. After taxonomic assessment, statistical analysis live-dead assemblages was conducted. For biodiversity, total number shells per sampling site, relative abundance, species richness, as well Shannon index used. Fidelity based on percentages between living dead similarity them measured Sørensen index. Our results show that during stable rainfall/fluvial conditions, individuals low, low while intense turbidity subsequent death gastropods, abundance increased, became high. Only collection site P4, diversity indices showed significant values. clockwise circulation water masses bay upwelling currents summer, coupled with physical-geographical barrier explain accumulation its behavior. Thus, exhibited direct impact soft-substrate Caenogastropoda Ubatuba Brazil.

Language: Английский

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Community evenness and sample size affect estimates of predation intensity and prey selection: A model-based validation

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: July 20, 2022

Abstract Predation estimates inferred from the preserved records of predation traces are essential in evaluating evolutionary effect ecological interactions. It is, however, crucial to establish how sampling intensity and community composition an assemblage influence reliability these measures. Using a resampling technique, we evaluated community’s evenness on estimates. We theoretically simulated model communities representing different levels evenness, intensity, predatory behavior (selective, non-selective). calculated total number prey species for each community. then resampled without replacement noted variations measure accurate estimate as increased. Our results demonstrate that does not non-selective predation. However, with highly selective sensitive intensity; assemblages can substantially differ actual value. The is also influenced by original selectivity, intensity. When selective, heavily influences low underrepresented smaller sample sizes. For where rare attacked preferentially, richness differs significantly at small size. proposed post-facto standardization method comparing discrete validated its utility using published data Plio-Pleistocene molluscan fossil assemblage. present approach attempts provide critical insight into may help patterns across time space. Several factors, including preservation bias, might impact final signature warrants future research direction develop comprehensive framework post-hoc differing styles history.

Language: Английский

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