Ecological and Environmental Stability in Offshore Southern California Marine Basins Through the Holocene

Palmer, Hannah M.; Hill, T. M.; Kennedy, Esther; Roopnarine, Peter D.; Langlois, Sonali; Reyes, Katherine R.; Stott, L. D.

doi:10.1029/2021pa004373

Cited by 4 publications

(1 citation statement)

References 92 publications

(273 reference statements)

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“…This taxon is mostly abundant in oxic conditions, but it has been also reported to be tolerant to dysoxic and suboxic conditions [44,45]. Another very abundant species is H. soldanii, an oxic taxon that has been recorded in well oxygenated, oligotrophic, and cold, deep water [46,47]. Consistently, this taxon has been found to show a negative correlation to the ES gradient underlying with coarser sediment (i.e., sand), lower values of pollutants (e.g., PLI, PAHs, and PCBs), and more importantly, of the organic matter (e.g., TOC and TN) as evidenced by the PCA.…”

Section: Discussionmentioning

confidence: 99%

Benthic Foraminifera as Proxies of Paleoenvironmental Changes in the Sant’Elia-Foxi Canyon (Gulf of Cagliari, Italy, Western Tyrrhenian Sea)

Cristallo,

Buosi,

Francescangeli

et al. 2023

JMSE

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Marine coastal areas are highly dynamic and fragile environments characterised by a complex interplay of biological, physical, and chemical factors. These areas are also affected by anthropogenic activities with the discharge of organic and inorganic contaminants that alters the quality of the environment. In this work, the effects of anthropogenic activities (i.e., urban and industrial development) on benthic foraminifera have been investigated along the A2TM core collected from the Sant’Elia-Foxi Canyon (Gulf of Cagliari, Sardinia—western Tyrrhenian Sea). The Gulf of Cagliari has experienced intense urbanisation since the beginning of the twentieth century with the establishment of petrochemical complexes and harbour activities. The A2TM core, dating from 1907 to 2013, was analysed with an integrated approach that includes grain size, organic matter, and benthic foraminifera characterisation compared with geochemical characterisation. The variations in the composition of the benthic foraminiferal assemblages and the Margalef diversity index are related to the altered environmental conditions that reflect the historical development of the area and to the land-based activities surrounding the Gulf of Cagliari. The statistical analysis identifies two main intervals (i.e., the years 1907–1986 and 1986–2013) that are typified by different benthic foraminiferal assemblages and diversity values. Accordingly, the increases in organic matter content and both organic and inorganic contaminants are well mirrored by a major drop in foraminiferal diversity after 1973 and a major foraminiferal turnover after 1989. The composition of the benthic foraminiferal assemblages in the uppermost part of the core (i.e., 1989–2013) might suggest a lowering of the oxygen availability at the seafloor. These changes might be related to the increase in organic matter and the silty fraction in the same interval likely triggered by damming on land and wetland reclamation.

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Section: Discussionmentioning

confidence: 99%

Benthic Foraminifera as Proxies of Paleoenvironmental Changes in the Sant’Elia-Foxi Canyon (Gulf of Cagliari, Italy, Western Tyrrhenian Sea)

Cristallo,

Buosi,

Francescangeli

et al. 2023

JMSE

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Deoxygenation of the Eastern Tropical North Pacific over the last 1200 years

Domínguez-Samalea,

Rey-Villiers,

Sánchez

2024

Quaternary International

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

Tomášových

Dominici

Nawrot

et al. 2023

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Conservation palaeobiology informs conservation and restoration of ecosystems by using the fossil record to discriminate between baseline and novel states and to assess ecosystem response to perturbations. Variability in the time scale of palaeobiological data can generate patterns that either exaggerate or mute the magnitude of biotic changes. We identify two approaches that remedy the challenges associated with the mixing of baseline and post-impact states and with the transformation of the stratigraphic depth to time. First, combining surface death assemblages with both (1) fossil assemblages preserved in the subsurface historical layers and (2) living assemblages can better resolve the nature of ecosystem shifts than within-core surveys or live-dead analyses alone. Second, post-mortem age distributions of skeletal particles and their preservation states are not only informative about stratigraphic resolution and time averaging of death assemblages but also about the timing of changes in abundance of skeletal producers. High abundance of the youngest age cohorts in surface death assemblages is a null expectation of disintegration and burial dynamic. When this dynamic is accounted for, age distributions of benthic invertebrates from Holocene sediments often reveal high volatility, prolonged turn-offs in production, or pervasive regime shifts that are obscured in the raw stratigraphic record. Supplementary material at https://doi.org/10.6084/m9.figshare.c.6487005

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Ecological and Environmental Stability in Offshore Southern California Marine Basins Through the Holocene

Cited by 4 publications

References 92 publications

Benthic Foraminifera as Proxies of Paleoenvironmental Changes in the Sant’Elia-Foxi Canyon (Gulf of Cagliari, Italy, Western Tyrrhenian Sea)

Benthic Foraminifera as Proxies of Paleoenvironmental Changes in the Sant’Elia-Foxi Canyon (Gulf of Cagliari, Italy, Western Tyrrhenian Sea)

Deoxygenation of the Eastern Tropical North Pacific over the last 1200 years

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

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