Advances in Our Understanding of Pelagic–Benthic Coupling

Testa, Jeremy M.; Faganeli, Jadran; Giani, Michele; Brush, Mark J.; Vittor, Cinzia De; Boynton, Walter R.; Covelli, Stefano; Woodland, Ryan J.; Kovač, Nives; Kemp, W. Michael

doi:10.1002/9781119543626.ch8

Cited by 7 publications

(9 citation statements)

References 134 publications

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“…Therefore, the percentage of in‐suspension age to the VPA can reach up to 99% in the lower bay especially for the slow‐sinking material (Figures 6c and 6e). In contrast, the fast‐sinking material can remain on the seabed and the on‐seabed age accounts for 90% of the VPA in the mid‐bay (Figures 6d and 6e), contributing to the high sedimentary OM content in this region besides the locally high production of OM from the spring phytoplankton bloom (Testa et al., 2020). Moreover, the reported limited nitrogen and carbon accumulation in the sediments in the polyhaline reach of CB could also be explained by the short retention time for particulate material in the sediments in the dynamic lower bay besides the locally low phytoplankton biomass and distant fluvial sources (Testa et al., 2020).…”

Section: Resultsmentioning

confidence: 99%

“…For example, grazing can package small phytoplankton into large fecal pellets (Ko et al., 2003; Prahl & Carpenter, 1979). The formation of “marine snow” and large mucilaginous aggregates can also enhance the sinking rate of OM (Testa et al., 2020). The present case studies indicate the high sensitivity of the VPA to the sinking rate, thus, the potential variations in settling velocity of particulate material during its transport might induce great differences to the estimated VPA.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, the potential interactions between particles and bottom sediments, for example, resuspension and deposition which can elongate the travel distance of the particles, were neglected in their particle tracking model. The benthic‐pelagic coupling in shallow coastal environments can regulate the transfer, retention, and recycling of OM and influence the recovery time of eutrophic ecosystems (Boynton et al., 2018; Brady et al., 2013; Testa et al., 2020). The downward transport of OM is a primary mechanism that connects benthic and pelagic habitats (Brady et al., 2013; Z. Wang et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The content of sedimentary OM also depends on the source and the potential retention efficiency in different environments. For example, the sedimentary OM content is high in the oligohaline and mesohaline CB, as the former receives the fluvial OM while the latter is supported by the sinking of spring phytoplankton blooms (Boynton et al., 2018; Testa et al., 2020). It is, therefore, of interest to estimate the duration for the surface‐produced OM to remain in the sediments at different locations with diverse dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Vertical Transport Timescale of Surface‐Produced Particulate Material in the Chesapeake Bay

Xiong

Shen

2022

JGR Oceans

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Accumulation and remineralization of surface‐produced particulate organic matter (POM) in the water column and seabed link closely to hypoxia and the health of aquatic ecosystems. The POM retention time provides a key timescale to interpret biochemical reaction processes. In this study, we investigated the spatiotemporal variations in the vertical particulate age (VPA) of surface‐produced POM, which is the mean time elapsed since the particulates last contact the surface, by incorporating major physical processes including sinking, resuspension, and deposition in the Chesapeake Bay. It was found that the vertical transport time for the particulates (i.e., VPA) is much longer than the dissolved counterparts as the former consists of new material from the surface and the resuspended aged material that has elongated resting on the seabed after deposition. The VPA is sensitive to settling velocity, especially in low‐frequent resuspension environments, and varies over 2 orders of magnitude with settling velocity from 0 to 10 m/day. Slow‐sinking material can remain in suspension and seldom settle to the seabed, thus mainly contribute to pelagic processes, while the fast‐sinking material connects closely with benthic processes. The seasonality of VPA decreases as the settling velocity increases. No significant difference in VPA was found between wet and dry years, yet the episodic strong flood events entrain old materials from the depositional lateral shoals to increase VPA in the channel. The transport age bridges cross disciplinaries by providing the fourth‐dimensional age information as a common currency to compare the physical transport timescale with the timescales for biochemical reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vertical Transport Timescale of Surface‐Produced Particulate Material in the Chesapeake Bay

Xiong

Shen

2022

JGR Oceans

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“…River discharges [29,[36][37][38], sewage discharges [28,[39][40][41], atmospheric deposition [27] and benthic fluxes [42,43] modulate the balances of the nutrients and organic matter in the GoT, having a great effect on plankton communities. In particular, the important effect on the productivity of this coastal system that derives from the nutrients discharged by the Isonzo River was shown [26,[36][37][38].…”

Section: Study Sitementioning

confidence: 99%

Climatic and Anthropogenic Impacts on Environmental Conditions and Phytoplankton Community in the Gulf of Trieste (Northern Adriatic Sea)

Cozzi

Cabrini

Kralj

et al. 2020

Water

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During the last century, human activities have exerted an increasing pressure on coastal ecosystems, primarily inducing their eutrophication, with a more recent partial mitigation of this phenomenon where improvements of environmental management practices were adopted. However, a reanalysis of the pressures on coastal zones and surrounding drainage basins is needed because of the alterations induced nowadays by the climate changes. A comparative analysis of long-term oceanographic and environmental data series (1986–2018) was performed, in order to highlight the effects of anthropogenic and climatic disturbances on the phytoplankton community in the Gulf of Trieste (GoT). After the 1980s, the decline in phytoplankton abundance was matched to increasing periods of low runoff, an overall deficit of the precipitation and to a decrease in phosphate availability in the coastal waters (−0.003 µmol L−1 yr−1), even in the presence of large riverine inputs of nitrogen and silicates. This trend of oligotrophication was reversed in the 2010s by the beginning of a new and unexpected phase of climatic instability, which also caused changes of the composition and seasonal cycle of the phytoplankton community. Beyond the management of nutrient loads, it was shown that climatic drivers such as seawater warming, precipitation and wind regime affect both nutrient balance and phytoplankton community in this coastal zone.

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Metal(loid)s in suspended particulate matter and plankton from coastal waters (Gulf of Trieste, northern Adriatic Sea)

et al. 2023

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Advances in Our Understanding of Pelagic–Benthic Coupling

Cited by 7 publications

References 134 publications

Vertical Transport Timescale of Surface‐Produced Particulate Material in the Chesapeake Bay

Vertical Transport Timescale of Surface‐Produced Particulate Material in the Chesapeake Bay

Climatic and Anthropogenic Impacts on Environmental Conditions and Phytoplankton Community in the Gulf of Trieste (Northern Adriatic Sea)

Metal(loid)s in suspended particulate matter and plankton from coastal waters (Gulf of Trieste, northern Adriatic Sea)

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