Pyrite-lined shells as indicators of inefficient bioirrigation in the Holocene–Anthropocene stratigraphic record DOI Creative Commons
Adam Tomášových, Michaela Berensmeier, Ivo Gallmetzer

и другие.

Biogeosciences, Год журнала: 2021, Номер 18(22), С. 5929 - 5965

Опубликована: Ноя. 22, 2021

Abstract. Although the depth of bioturbation can be estimated on basis ichnofabric, timescale sediment mixing (reworking) and irrigation (ventilation) by burrowers that affects carbonate preservation biogeochemical cycles is difficult to estimate in stratigraphic record. However, pyrite linings interior shells a signature slow shallow irrigation. They indicate molluscs initially inhabiting oxic pockets were immediately permanently sequestered reduced, iron-rich microenvironments within mixed layer. Molluscan biomass-stimulated sulfate reduction precipitation was confined location decay under such conditions. A high abundance pyrite-lined record thus diagnostic limited exposure organic tissues O2 even when seafloor inhabited abundant infauna disrupting age-homogenizing sedimentary fabric as present-day northern Adriatic Sea. Here, we reconstruct this sequestration pathway characterized (1) assessing postmortem ages shallow-infaunal hypoxia-tolerant bivalve Varicorbula gibba cores (2) evaluating whether an independently documented decline mixing, driven frequency seasonal hypoxia during 20th century, affected First, at prodelta sites with sedimentation rate, framboids form rapidly upper 5–10 cm they already appear interiors younger than 10 years occur preferentially well-preserved articulated periostracum. Second, increments deposited early century contain < 20 % lined Po 30 %–40 Isonzo prodelta, whereas late possess 50 %–80 both locations. At low (< %–20 %). Surface sediments remained well deposit detritus feeders maintaining suboxic zone dissolved iron. The upcore increase indicates oxycline reduced bioirrigation rates declined century. We hypothesize permanent V. subsurface enabled recovery infaunal communities from hypoxic events, leading dominance surficial modifiers potential. presence very young valves uppermost zones layer rapid obrution episodic deposition not needed for transient background are (here, exceeding ∼ 0.1 yr−1) organisms die their living position sediment. Abundance per assemblage apparently well-mixed deep-time indicator inefficient bioirrigation. Fine-grained Sea since mid-20th potential formed layer, represent taphonomic diagenetic analogues skeletal assemblages linings.

Язык: Английский

Hypoxia and dissolved oxygen trends in the northeastern Adriatic Sea (Gulf of Trieste) DOI
Martina Kralj, Marina Lipizer,

Branko Čermelj

и другие.

Deep Sea Research Part II Topical Studies in Oceanography, Год журнала: 2019, Номер 164, С. 74 - 88

Опубликована: Июнь 1, 2019

Язык: Английский

Процитировано

64
Ecological regime shift preserved in the Anthropocene stratigraphic record DOI Open Access
Adam Tomášových, Paolo G. Albano,

Tomáš Fuksi

и другие.

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

Процитировано

59
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

21
A decline in molluscan carbonate production driven by the loss of vegetated habitats encoded in the Holocene sedimentary record of the Gulf of Trieste DOI Creative Commons
Adam Tomášových, Ivo Gallmetzer,

Alexandra Haselmair

и другие.

Sedimentology, Год журнала: 2018, Номер 66(3), С. 781 - 807

Опубликована: Июнь 26, 2018

Abstract Carbonate sediments in non‐vegetated habitats on the north‐east Adriatic shelf are dominated by shells of molluscs. However, rate carbonate molluscan production prior to 20th century eutrophication and overfishing this other shelves remains unknown because: (i) monitoring ecosystems was scarce; (ii) ecosystem history inferred from cores is masked condensation mixing. Here, based geochronological dating four bivalve species, during Holocene assessed Gulf Trieste, where algal seagrass underwent a major decline century. Assemblages sand‐dwelling Gouldia minima opportunistic Corbula gibba time‐averaged >1000 years older >2000 than co‐occurring . This age difference driven temporally disjunct two species coupled with decimetre‐scale Stratigraphic unmixing shows that declined abundance highstand phase increased again In contrast, one contributors sands – phase, but almost zero over past centuries. herbivorous gastropods associated macroalgae or seagrasses abundant top‐core increments rarely alive. Although not limited vegetated habitats, it such elsewhere Mediterranean Sea. live–dead mismatch reflects between baseline communities (with soft‐bottom zones hard‐bottom Arca beds) present‐day oligophotic organic‐loving species. Therefore, light penetration loss high traces back 19th More 50% sea floor Trieste reflect inactive sourced heterozoan factory habitats.

Язык: Английский

Процитировано

53
Millennial‐Scale Age Offsets Within Fossil Assemblages: Result of Bioturbation Below the Taphonomic Active Zone and Out‐of‐Phase Production DOI Creative Commons
Adam Tomášových, Susan M. Kidwell, Clark Alexander

и другие.

Paleoceanography and Paleoclimatology, Год журнала: 2019, Номер 34(6), С. 954 - 977

Опубликована: Май 13, 2019

Abstract Oceanographic and evolutionary inferences based on fossil assemblages can be obscured by age offsets among co‐occurring shells (i.e., time averaging). To identify the contributions of sedimentation, mixing, durability, production to within‐ between‐species offsets, we analyze downcore changes in age‐frequency distributions two bivalves California shelf. Within‐species are ~50–2,000 years for Parvilucina ~2,000–4,000 Nuculana 1,000–4,000 within 10‐ 25‐cm‐thick stratigraphic units. Shells top 20–24 cm seabed age‐homogeneous, defining thickness surface completely‐mixed layer (SML), have strongly right‐skewed distributions, indicating fast shell disintegration. The SML thus coincides with taphonomic active zone extends below redoxcline at ~10 cm. >2,000–3,000 old occurring been exhumed from subsurface shell‐rich units rich where disintegration is negligible (sequestration zone, SZ). Burrowers (callianassid shrimps) penetrate 40–50 seafloor into this SZ. millennial each increment result advection SZ, combined an out‐of‐phase change species production. Age unmixing reveals that was abundant during transgressive phase, rare highstand increased steeply twentieth century response wastewater. phase has declined over past centuries. This sequestration‐exhumation dynamic accentuates allowing both persistence their later admixing younger SML.

Язык: Английский

Процитировано

46
CHALLENGES OF CONSERVATION PALEOBIOLOGY: FROM BASELINES TO NOVEL COMMUNITIES TO THE NECESSITY FOR GRANTING RIGHTS TO NATURE DOI
Martin Zuschin

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

Процитировано

15
Ecosystem turnover in an urbanized subtropical seascape driven by climate and pollution DOI
Yuanyuan Hong, Moriaki Yasuhara, Hokuto Iwatani

и другие.

Anthropocene, Год журнала: 2021, Номер 36, С. 100304 - 100304

Опубликована: Июль 28, 2021

Язык: Английский

Процитировано

28
Ideas and perspectives: Human impacts alter the marine fossil record DOI Creative Commons
Rafał Nawrot, Martin Zuschin, Adam Tomášových

и другие.

Biogeosciences, Год журнала: 2024, Номер 21(9), С. 2177 - 2188

Опубликована: Май 3, 2024

Abstract. The youngest fossil record is a crucial source of data documenting the recent history marine ecosystems and their long-term alteration by humans. However, human activities that reshape communities habitats also alter sedimentary biological processes control formation archives recording those impacts. These diverse physical, geochemical, disturbances include changes in sediment fluxes due to alluvial coastal landscapes, seabed disturbance bottom trawling ship traffic, ocean acidification deoxygenation, removal native species, introduction invasive ecosystem engineers. novel modify sedimentation rates, depth intensity mixing, pore-water saturation state, preservation potential skeletal remains – parameters controlling completeness spatiotemporal resolution record. We argue humans have become major force transforming nature ways can both impede improve our ability reconstruct past ecological climate dynamics. A better understanding feedback between impacts on offers new research opportunities tools for interpreting geohistorical ongoing anthropogenic transformation ocean.

Язык: Английский

Процитировано

4
Reply on CC3 DOI Creative Commons
Niklas Hohmann

Опубликована: Янв. 15, 2025

Abstract. Age-depth models are fundamental tools used in all geohistorical disciplines. They assign stratigraphic positions to ages (e.g., drill cores or outcrops), which is necessary estimate rates of past environmental change and establish timing events sedimentary sequences. Methods age-depth commonly use simplified parametric assumptions on the uncertainties tie points. The distribution time between points estimated using simplistic formation record, for example that sediment accumulates discrete follow a Poisson process. In general, crude simplification fail provide comprehensive implementation empirical data expert knowledge from structures such as erosional surfaces basin models). other words, many information sources can potentially geochronologic remain un- underused. Here, we present two non-parametric methods complex sedimentological data. complementary they different (sedimentation observed tracer values), implemented admtools package R Software allow user specify any error model uncertainties. As cases methods,

first case study suggests event lasted 89 kyr (IQR: 84 97 kyr) places at 371.834 ± 0.101 Ma (2 σ), whereas second provides 41 48 kyr PETM recovery interval. These examples show how variety be combined relationships accurately reflect both available knowledge.

Язык: Английский

Процитировано

0
TRACING ORIGIN AND COLLAPSE OF HOLOCENE BENTHIC BASELINE COMMUNITIES IN THE NORTHERN ADRIATIC SEA DOI Creative Commons
Ivo Gallmetzer,

Alexandra Haselmair,

Adam Tomášových

и другие.

Palaios, Год журнала: 2019, Номер 34(3), С. 121 - 145

Опубликована: Март 1, 2019

The shallow northern Adriatic Sea has a long history of anthropogenic impacts that reaches back many centuries. While the effects eutrophication, overfishing, pollution, and trawling over recent decades have been extensively studied, major ecological turnovers during Holocene as whole remain poorly explored. In this study, we reconstruct baselines defining benthic ecosystem composition prior to changes at four stations characterized by low sedimentation millennial-scale time averaging molluscan assemblages. We discriminate between natural drivers based on (1) stratigraphic in communities observed sediment cores (2) concentrations heavy metals, pollutants, organic enrichment. 1.5-m reach Pleistocene–Holocene boundary, allowing for distinction sea-level phases Holocene. During transgressive phase maximum flooding, establishment modern circulation pattern determined development shallow-water, vegetated habitats with epifaunal biostromes and, deeper waters, bryozoan meadows. After stabilization, these baseline remained relatively uniform started change markedly only intensification human late highstand, leading dominance infauna decline epifauna all sites. This profound reduced species richness, increased abundance infaunal suspension feeders, led grazers deposit feeders. suggest soft-bottom today do not show high geographic heterogeneity characteristic benthos influences.

Язык: Английский

Процитировано

34