Hypoxia and dissolved oxygen trends in the northeastern Adriatic Sea (Gulf of Trieste)

Kralj, Martina; Lipizer, Marina; Čermelj, Branko; Celio, Massimo; Fabbro, Cinzia; Brunetti, Fabio; Francé, Janja; Mozetič, Patricija; Giani, Michele

doi:10.1016/j.dsr2.2019.06.002

Cited by 49 publications

(31 citation statements)

References 60 publications

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“…Second, C. gibba populations that did not experience an increase in size during the twentieth century were limited to the shallowest or high-energy habitats at the Isonzo prodelta and off Venice. They were thus not subjected to seasonal hypoxia, in contrast with deeper habitats located below the thermocline and experiencing annual to inter-annual frequencies of hypoxic events at the Po prodelta [49] and less regular hypoxic events in the Gulf of Trieste [50]. Third, size in DAs increases geographically with the relative frequency of seasonal hypoxia at 16 sites (figure 2b).…”

Section: Discussionmentioning

confidence: 97%

Ecological regime shift preserved in the Anthropocene stratigraphic record

et al. 2020

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

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Section: Discussionmentioning

confidence: 97%

Ecological regime shift preserved in the Anthropocene stratigraphic record

et al. 2020

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“…The two sites in the Gulf of Trieste do not differ significantly in terms of substrata and exposure to winds and currents, since both can be defined as "rocky shallow moderately exposed" [56]. However, the Miramare MPA is located in an area that is subject to high nutrient availability in the spring and autumn periods due to riverine discharges, especially from the Isonzo River [76], while the Piran site is influenced mainly by smaller rivers [77]. Thus, we can assume that it is less eutrophic in general, even if nutrient data are not collected from such shallow waters, but at a distance of 1.3 km from the coast [77].…”

Section: Discussionmentioning

confidence: 99%

“…However, the Miramare MPA is located in an area that is subject to high nutrient availability in the spring and autumn periods due to riverine discharges, especially from the Isonzo River [76], while the Piran site is influenced mainly by smaller rivers [77]. Thus, we can assume that it is less eutrophic in general, even if nutrient data are not collected from such shallow waters, but at a distance of 1.3 km from the coast [77]. According to the TRIX index, that represents a combination of pressure (Dissolved Inorganic Nitrogen and Total Phosphorus) and impact indicators (chlorophyll a and oxygen absolute deviation from saturation), the water quality conditions of Slovenian coastal waters was evaluated as Elevated (oligotrophy) [78].…”

Section: Discussionmentioning

confidence: 99%

First Restoration Experiment for Gongolaria barbata in Slovenian Coastal Waters. What Can Go Wrong?

Orlando-Bonaca

Pitacco

Slavinec

et al. 2021

Plants

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The global decline of brown algal forests along rocky coasts is causing an exceptional biodiversity loss. Regardless of conservation efforts, different techniques have been developed for large-scale restoration strategies in the Mediterranean Sea. In this study we tested ex situ pilot restoration of Gongolaria barbata (=Treptacantha barbata) for the first time in Slovenian coastal waters. Healthy apical fronds of the species were collected and the development of recruits on clay tiles was followed under laboratory conditions for 20 days. Despite the experimental difficulties experienced, especially due to the lack of antibiotics to prevent the growth of the biofilm, G. barbata recruits were outplanted in the sea on two concrete plates with 48 tiles each, protected by purpose-built cages to avoid grazing by herbivorous fish. The high survival rate of juveniles after four months in the field (89% of the tiles on the plate that was constantly protected) suggests that outplanting G. barbata is an operable approach for restoration efforts in the northern Adriatic Sea. Our first experiment in Slovenian coastal waters provides new information for the optimization of the best practices during the laboratory cultivation and addresses the early steps of restoration and introduction of young thalli in the natural environment.

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“…Worms, oysters, crabs, and bottom feeders require at least 1-6 ppm of oxygen (1-6 ppm), whereas shallow-water fishes need more oxygen from 4 ppm to 15 ppm. Yellow Perch, White Perch, Largemouth Bass, and Bluegill are known as warm-water fishes and require DO levels of more than 5 ppm [82]. They cannot stay in the areas having less than 3 ppm of DO levels and suffer badly when the oxygen level is reduced to 2 ppm.…”

Section: Dissolved Oxygen (Do)mentioning

confidence: 99%

Recent Advancement of the Sensors for Monitoring the Water Quality Parameters in Smart Fisheries Farming

et al. 2021

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Water quality is the most critical factor affecting fish health and performance in aquaculture production systems. Fish life is mostly dependent on the water fishes live in for all their needs. Therefore, it is essential to have a clear understanding of the water quality requirements of the fish. This research discusses the critical water parameters (temperature, pH, nitrate, phosphate, calcium, magnesium, and dissolved oxygen (DO)) for fisheries and reviews the existing sensors to detect those parameters. Moreover, this paper proposes a prospective solution for smart fisheries that will help to monitor water quality factors, make decisions based on the collected data, and adapt more quickly to changing conditions.

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Hypoxia and dissolved oxygen trends in the northeastern Adriatic Sea (Gulf of Trieste)

Cited by 49 publications

References 60 publications

Ecological regime shift preserved in the Anthropocene stratigraphic record

Ecological regime shift preserved in the Anthropocene stratigraphic record

First Restoration Experiment for Gongolaria barbata in Slovenian Coastal Waters. What Can Go Wrong?

Recent Advancement of the Sensors for Monitoring the Water Quality Parameters in Smart Fisheries Farming

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