Effects of ocean circulation on the eutrophication of a Mediterranean gulf with river inlets: The Northern Thermaikos Gulf

Androulidakis, Yannis; Kolovoyiannis, Vassilis; Makris, Christos; Krestenitis, Yannis Ν.; Baltikas, Vasilis; Stefanidou, Natassa; Chatziantoniou, Andromachi; Topouzelis, Konstantinos; Moustaka‐Gouni, Maria

doi:10.1016/j.csr.2021.104416

Cited by 15 publications

(32 citation statements)

References 34 publications

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“…The hydrological dynamics of the Thermaikos Gulf are notably influenced by freshwater discharges from four primary rivers: Axios, Aliakmonas, Loudias, and Gallikos. Of these, the Axios and Aliakmonas Rivers emerge as particularly significant, giving rise to complex multi-channel deltaic systems, as delineated by [14,15]. It is worth noting that the Axios River has been identified as a source of considerable pollution, channeling elevated nutrient concentrations from its watershed into the Thermaikos Gulf (as documented by [16]).…”

Section: Sampling Sitementioning

confidence: 99%

“…The circulation pattern includes the more saline water entrance from the eastern part, following a northwestern direction, and the exit of lighter water in the form of river plumes with a southward direction, along the western coastline [17]. The Thermaikos Gulf is considered a mesotrophic system; however, extreme eutrophication events often occur under persistent southerly winds [15]. However, overall ecosystem degradation can be observed, with decreasing fish catches and biomass as a result of overfishing and environmental factors [18].…”

Section: Sampling Sitementioning

confidence: 99%

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Temporal and Environmental Dynamics of Fish Stocks in the Marine Protected Area of the Artificial Reef of Kitros, Pieria (Northern Greece, Mediterranean Sea)

Kallianiotis,

Batjakas

2023

JMSE

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The impact of temporal factors and physiochemical properties on the quantities and biomass of fish in the Thermaikos Gulf and adjacent habitats around the Pieria artificial reef complex in Northern Greece was evaluated. Data were collected from edge habitats of an artificial reef made of submerged concrete blocks located offshore of Kitros. Between 2015 and 2017, sampling excursions took place in the spring, summer, and fall of each year. The artificial reef complex is positioned 11.5 km offshore from Kitros, near the delta of the Aliakmonas River, and is influenced by freshwater from the Axios, Aliakmonas, Ludias, and Gallikos Rivers. To estimate the biomass and numbers of the primary benthopelagic commercial fish in the region, nine experimental samples were taken from 2015 to 2017, employing a bottom trawl with a mesh size of 10 mm. Each trawl sample lasted for 30 min to reduce the environmental impact of fishing in the areas under study. The sampling schedule was aligned with factors like the breeding times of the dominant species and the seasonal changes in the thermocline zone. Analysis showed seasonal differences in average abundance and biomass values across the 3 years of the study. Mullus barbatus, recognized as the most commercially significant species caught, demonstrated the greatest abundance and biomass during the second sampling season. Conversely, Pagellus erythrinus, the second most vital commercial species caught, exhibited its highest abundance in the first season and reached its peak biomass during the third sampling season. Hierarchical cluster analyses showed that the two major resulting clusters of species proliferated in numbers over the 3-year period, while undergoing a concurrent reduction in their individual sizes.

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Section: Sampling Sitementioning

confidence: 99%

Section: Sampling Sitementioning

confidence: 99%

Temporal and Environmental Dynamics of Fish Stocks in the Marine Protected Area of the Artificial Reef of Kitros, Pieria (Northern Greece, Mediterranean Sea)

Kallianiotis,

Batjakas

2023

JMSE

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“…The North Aegean waters hold lower salinity levels compared to the South Aegean because of a) the inflow of Black Sea Water (BSW) masses through the Dardanelles strait at the eastern part of the TS (Somarakis et al, 2002) and b) the river outflows in the case of GT (Androulidakis et al, 2021). The BSW surface layer can provide salinity values as low as 36‰, whereas in the rest of the Aegean, salinity in the range of 39-40‰ is observed (Karageorgis et al, 2012).…”

Section: Study Areamentioning

confidence: 99%

Can we actually monitor the spatial distribution of small pelagic fish based on Sentinel-3 data? An example from the North Aegean Sea (Eastern Mediterranean Sea)

et al. 2023

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Fish population spatial distribution data provide essential information for fleet monitoring and fishery spatial planning. Modern high resolution ocean color remote sensing sensors with daily temporal coverage can enable consistent monitoring of highly productive areas, giving insight in seasonal and yearly variations. Here is presented the methodology to monitor small pelagic fish spatial distribution by means of 500m resolution satellite data in a geographically and oceanographically complex area. Specifically, anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) acoustic biomass data are modeled against environmental proxies obtained from the Sentinel-3 satellite mission. Three modeling techniques (Logistic Regression, Generalized Additive Models, Random Forest) were applied and validated against the in-situ measurements. The accuracy of anchovy presence detection peaked at 76% and for sardine at 78%. Additionally, the spatial distribution of the models’ output highlighted known fishing grounds. For anchovy, biomass modeling highlighted the importance of bathymetry, SST, and the distance from thermal fronts, whereas for sardine, bathymetry, CHL and chlorophyll fronts. The models are applied to a sample dataset to showcase a potential outcome of the proposed methodology and its spatial characteristics. Finally, the results are discussed and compared to other habitat studies and findings in the area.

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“…As for river discharges, the Gulf receives great amounts of water from the Axios, Aliakmon, Loudias, and Gallikos Rivers, with the Axios River having the highest contribution. Human pressures derive from many activities like agriculture on the coastal plains, aquaculture (especially the shellfish and mainly the mussels' production represents about 80-85% of the national production, whereas the mussels' rafts through the change of the microhabitats favor the growth of dinoflagellates), urban and industrial wastewaters, construction of dams, tourism, and shipping [123][124][125].…”

Section: Thermaikos Gulfmentioning

confidence: 99%

Review of Harmful Algal Blooms in the Coastal Mediterranean Sea, with a Focus on Greek Waters

Tsikoti

Genitsaris

2021

Diversity

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Anthropogenic marine eutrophication has been recognized as one of the major threats to aquatic ecosystem health. In recent years, eutrophication phenomena, prompted by global warming and population increase, have stimulated the proliferation of potentially harmful algal taxa resulting in the prevalence of frequent and intense harmful algal blooms (HABs) in coastal areas. Numerous coastal areas of the Mediterranean Sea (MS) are under environmental pressures arising from human activities that are driving ecosystem degradation and resulting in the increase of the supply of nutrient inputs. In this review, we aim to present the recent situation regarding the appearance of HABs in Mediterranean coastal areas linked to anthropogenic eutrophication, to highlight the features and particularities of the MS, and to summarize the harmful phytoplankton outbreaks along the length of coastal areas of many localities. Furthermore, we focus on HABs documented in Greek coastal areas according to the causative algal species, the period of occurrence, and the induced damage in human and ecosystem health. The occurrence of eutrophication-induced HAB incidents during the past two decades is emphasized.

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Effects of ocean circulation on the eutrophication of a Mediterranean gulf with river inlets: The Northern Thermaikos Gulf

Cited by 15 publications

References 34 publications

Temporal and Environmental Dynamics of Fish Stocks in the Marine Protected Area of the Artificial Reef of Kitros, Pieria (Northern Greece, Mediterranean Sea)

Temporal and Environmental Dynamics of Fish Stocks in the Marine Protected Area of the Artificial Reef of Kitros, Pieria (Northern Greece, Mediterranean Sea)

Can we actually monitor the spatial distribution of small pelagic fish based on Sentinel-3 data? An example from the North Aegean Sea (Eastern Mediterranean Sea)

Review of Harmful Algal Blooms in the Coastal Mediterranean Sea, with a Focus on Greek Waters

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