Resilient biotic response to long‐term climate change in the Adriatic Sea

Global Change Biology, Год журнала: 2022, Номер 28(13), С. 4041 - 4053

Опубликована: Апрель 12, 2022

Abstract Preserving adaptive capacities of coastal ecosystems, which are currently facing the ongoing climate warming and a multitude other anthropogenic impacts, requires an understanding long‐term biotic dynamics in context major environmental shifts prior to human disturbances. We quantified responses nearshore mollusk assemblages sea‐level changes using 223 samples (~71,300 specimens) retrieved from latest Quaternary sediment cores Adriatic systems. These provide rare chance study systems that existed during glacial lowstands. The fossil record indicates penultimate interglacial (Late Pleistocene) shifted their faunal composition subsequent ice age, then reassembled again with return Holocene. point climate‐driven habitat filtering modulated by dispersal processes. resilient, rather than persistent or stochastic, response over at least 125 thousand years highlights historically unprecedented nature stressors (e.g., pollution, eutrophication, bottom trawling, invasive species) shifting regions into novel system states far outside range natural variability archived record.

Язык: Английский

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Multiple phyla, one time resolution? Similar time averaging in benthic foraminifera, mollusk, echinoid, crustacean, and otolith fossil assemblages

Geology, Год журнала: 2022, Номер 50(8), С. 902 - 906

Опубликована: Май 9, 2022

Abstract Time averaging of fossil assemblages determines temporal precision paleoecological and geochronological inferences. Taxonomic differences in intrinsic skeletal durability are expected to produce mismatch between co-occurring species, but the importance this effect is difficult assess due lack direct estimates time for many higher taxa. Moreover, burial below taphonomic active zone early diagenetic processes may alleviate taxonomic disintegration rates subsurface sediments. We compared across five phyla major carbonate producers a sediment core from northern Adriatic Sea shelf. dated individual bivalve shells, foraminiferal tests, tests isolated plates irregular regular echinoids, crab claws, fish otoliths. In spite different architecture, mineralogy, life habit, all taxa showed very similar varying ~1800 ~3600 yr (interquartile age ranges). Thus, remains echinoids crustaceans—two groups with multi-elemental skeletons assumed have low preservation potential—can still undergo extensive mixing comparable that mollusk shells. The median ages differed by as much ~3700 yr, reflecting species-specific timing seafloor colonization during Holocene transgression. Our results congruent sequestration models invoking minimize among These together variability production can overrule effects determining resolution multi-taxic assemblages.

Язык: Английский

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Ecological regime shift preserved in the Anthropocene stratigraphic record

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2020, Номер 287(1929), С. 20200695 - 20200695

Опубликована: Июнь 17, 2020

Palaeoecological data are unique historical archives that extend back far beyond the last several decades of ecological observations. However, fossil record continental shelves has been perceived as too coarse (with centennial-millennial resolution) and incomplete to detect processes occurring at yearly or decadal scales relevant ecology conservation. Here, we show youngest (Anthropocene) on northern Adriatic shelf provides decadal-scale resolution accurately documents an abrupt change affecting benthic communities during twentieth century. The magnitude duration century shift in body size bivalve Corbula gibba is unprecedented given regional populations this species were dominated by small-size classes throughout Holocene. coincided with compositional changes assemblages, driven increase from approximately 25% 70% median per-assemblage abundance C. gibba. This regime occurred preferentially sites experienced least one hypoxic event per decade Larger higher probably reflect release it coincides frequency seasonal hypoxia triggered mass mortality competitors predators. Higher events coupled a decline depth intense sediment mixing burrowing organisms decimetres less than 20 cm, significantly improving stratigraphic Anthropocene making possible sub-centennial shelves.

Язык: Английский

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

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

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

PeerJ, Год журнала: 2023, Номер 11, С. e15574 - e15574

Опубликована: Июль 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.

Язык: Английский

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CHALLENGES OF CONSERVATION PALEOBIOLOGY: FROM BASELINES TO NOVEL COMMUNITIES TO THE NECESSITY FOR GRANTING RIGHTS TO NATURE

Palaios, Год журнала: 2023, Номер 38(6), С. 259 - 263

Опубликована: Июнь 23, 2023

Research Article| June 23, 2023 CHALLENGES OF CONSERVATION PALEOBIOLOGY: FROM BASELINES TO NOVEL COMMUNITIES THE NECESSITY FOR GRANTING RIGHTS NATURE MARTIN ZUSCHIN Department of Paleontology, University Vienna, Josef-Holaubek-Platz 2, 1090 Austria email: [email protected] Search for other works by this author on: GSW Google Scholar Author and Article Information Publisher: SEPM Society Sedimentary Geology Received: 17 May Accepted: 24 First Online: 27 Jun Online ISSN: 1938-5323 Print 0883-1351 Copyright © 2023, (Society Geology) PALAIOS (2023) 38 (6): 259–263. https://doi.org/10.2110/palo.2023.020 history Cite View This Citation Add to Manager Share Icon Facebook Twitter LinkedIn Email Permissions Site ZUSCHIN; NATURE. 2023;; doi: Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown Menu input auto suggest filter your All ContentBy SocietyPALAIOS Advanced Conservation Paleobiology (CP) was formally introduced more than 20years ago (Flessa 2002) as a field that deals with the application theories analytical tools paleontology biodiversity conservation, but has multifaceted roots go back at least into 1970s (Dietl Flessa 2009; Dillon et al. 2022). More thirty years ago, it already evident anthropogenic impacts had changed modern marine environments so profoundly ecological research alone does not catch undisturbed baselines (e.g., Pauly 1995; Jackson 1997; 2001; Kowalewski Pandolfi et... You do have access content, please speak institutional administrator if you feel should access.

Язык: Английский

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Inferring time averaging and hiatus durations in the stratigraphic record of high‐frequency depositional sequences

Sedimentology, Год журнала: 2021, Номер 69(3), С. 1083 - 1118

Опубликована: Авг. 22, 2021

Abstract A sequence stratigraphic framework predicts that time averaging and hiatus durations will be long at times of fastest sea‐level rise. This prediction does not necessarily apply to environments where carbonate production keeps up with rise undetected hiatuses decouple short‐term from long‐term sedimentation rates. The taphonomic clock, however, which measures the residence skeletal particles in mixed layer, can estimate duration if rate alteration is slow endure exposure layer. Here, calibrated by using evidence bivalves a metre‐scale Holocene Adriatic Sea. In this sequence, transgressive molluscan lags, maximum‐flooding zone shell bed bivalves, highstand bryomol assemblages were all deposited under similar rates ( ca 0.01 0.03 cm year −1 ) exhibit millennial averaging. Median ages valves stained pyrite cemented high‐magnesium calcitic micritic envelopes exceeding 1000 years indicate that: (i) these authigenic processes are subsurface zones reducing conditions (with prolonged sulphate reduction ions sourced dissolved shells surface zones); (ii) micrite precipitation prolongs disintegration half‐lives exhumed decades millennia. high abundance valves, envelopes, composite (encrusters borers colonizing grains) thus identifies concentrations time‐averaged >1000 years. upcore decrease alteration, coupled temporally‐constant averaging, indicates temporal decline sediment exhumation was compensated burial produced molluscs.

Язык: Английский

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Assessing biotic response to anthropogenic forcing using mollusc assemblages from the Po–Adriatic System (Italy)

Geological Society London Special Publications, Год журнала: 2022, Номер 529(1), С. 293 - 310

Опубликована: Дек. 22, 2022

Abstract Preserving the adaptive capacities of coastal ecosystems in Anthropocene requires an understanding their natural variability prior to modern times. We quantified responses nearshore molluscs assemblages past environmental changes using 101 samples ( c. 57 300 specimens) retrieved from subsurface Holocene succession and present-day seabed Po–Adriatic System (Italy). Present-day shifted faunal composition with respect mid-late counterparts. Major differences are observed lower settings, where show higher heterogeneity, reduced standardized richness, relative abundance Lentidium mediterraneum, increased Varicorbula gibba , scavengers (genus Tritia ), deposit feeders (nuculid bivalves). A dominance infaunal opportunistic species shifts towards detritus-feeding scavenging often associated disturbed benthic habitats. Our results suggest that ongoing anthropogenic stressors (mainly bottom trawling non-native species) currently shifting communities into novel states outside range archived fossil record. Supplementary material: document containing additional statistics, figures, tables, also considering different filters applied molluscan dataset, is provided as a Word file. In addition, appendices concerning sample taxa information R-scripts .csv .r files. These available at https://doi.org/10.6084/m9.figshare.c.6351348

Язык: Английский

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Radiocarbon dating supports bivalve-fish age coupling along a bathymetric gradient in high-resolution paleoenvironmental studies

Geology, Год журнала: 2020, Номер 48(6), С. 589 - 593

Опубликована: Март 27, 2020

Abstract Studies of paleocommunities and trophic webs assume that multispecies assemblages consist species coexisted in the same habitat over duration time averaging. However, even with similar durability can differ age within a single fossil assemblage. Here, we tested whether skeletal remains different phyla guilds, most abundant infaunal bivalve shells nektobenthic fish otoliths, differed radiocarbon surficial sediments along depth gradient from 10 to 40 m on warm-temperate Israeli shelf, modeled their dynamics taphonomic loss. We found that, spite higher potential fishes for out-of-habitat transport after death, differences structure depths were smaller by almost an order magnitude than between depths. Shell otolith underwent depth-specific burial pathways independent taxon identity, generating death comparable averaging, supporting assumption temporal spatial co-occurrence mollusks fishes.

Язык: Английский

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Paleocoastline modelling – What a difference a few meters of sediment make?

Quaternary International, Год журнала: 2024, Номер 706, С. 49 - 59

Опубликована: Июль 22, 2024

Paleoreconstructions of coastal and near-coastal areas have always served as a tool towards better understanding past, present future geological geomorphological processes. The reliability paleocoastline sea-land extent modelling is controlled by input data. Here the difference between paleoreconstructions based on present-day bathymetry paleotopographic elevation model are examined example Gulf Trieste (northern Adriatic sea) - low-gradient submerged Last Glacial Maximum alluvial plain with fairly well-resolved pre-transgressional paleotopography. Results presented in this study show striking differences spatial two modelled sets paleocoastlines which places exceeds tens kilometers. These results demonstrate importance using an appropriate geologically-supported for paleoreconstruction unsuitable models can result significant errors unreliable reconstructions. This especially noteworthy settings where even slight variation sea level affect vast areas. Finally, provide insight into Early Holocene evolution area abrupt predominant northeasterly oriented transgression direction indicated from

Язык: Английский

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