| 1. |
- Dimiza, Margarita D., et al.
(author)
-
Coccolithophore Distribution in the Western Black Sea in the Summer of 2016
- 2023
-
In: Diversity. - : MDPI. - 1424-2818. ; 15:12
-
Journal article (peer-reviewed)abstract
- Coccolithophores are an important component of phytoplankton abundance and biomass in the brackish environments of the Black Sea. Here, the abundance, composition, and distribution of coccolithophores were investigated in water samples taken from the first 50 m at 18 stations in the western Black Sea during a coccolithophore bloom, in June 2016. The total cell abundances ranged from 2 to 763 x 104 coccospheres L-1; Emiliania huxleyi was the most dominant species, but also Syracosphaera spp. (S. dilatata and S. molischii), Acanthoica (A. acanthifera and A. quattrospina), and Algirosphaera robusta displayed remarkably high concentrations. The formation of the seasonal thermocline significantly affects the vertical distribution of coccolithophores. Emiliania huxleyi, Syracosphaera spp., and Acanthoica spp. were restricted to the upper part of the water column, whereas high abundances of Algirosphaera robusta occurred below the thermocline. Overall, our results show significant differences in the vertical (ANOSIM R = 0.50, p = 0.0001) and spatial (ANOSIM R = 0.18, p = 0.0006) distribution of coccolithophores. Higher abundances of E. huxleyi and Syracosphaera spp. were recorded in the northwestern inner shelf region when compared to the open-sea samples. The observed coccolithophore spatial distribution is suggested to be mostly associated with the influx of less saline river water with high nutrient concentrations.
|
|
| 2. |
- Guittard, Alice, et al.
(author)
-
Using multi-actor labs as a tool to drive sustainability transitions in coastal-rural territories : Application in three European regions
- 2024
-
In: GAIA. - 0940-5550 .- 2625-5413. ; 33, s. 57-63
-
Journal article (peer-reviewed)abstract
- Multi -actor labs (MALs), a form of real -world social experiments, were implemented in three coastal -rural regions in France (Charente River Basin), Spain (Mar Menor), and Greece (South-West Messinia) to better assess and tackle coastal -rural interactions that govern local sustainability challenges, such as water use conflicts and biodiversity degradation. The MALs used participative methodologies based on systems thinking and transition management. Stakeholders were continuously engaged in a series of workshops to co -produce knowledge, reach a common understanding of the sustainability challenges and issues at stake, and co -design solutions in the form of a roadmap for sustainable transitions in coastal -rural regions. This paper evaluates MALs to provide examples of successful sustainability transition experiments based on the outputs produced, outcomes achieved, and processes used in the three coastal, rural regions.
|
|
| 3. |
- Karageorgis, Aristomenis P., et al.
(author)
-
Authigenic carbonate mineral formation in the Pagassitikos palaeolake during the latest Pleistocene, central Greece
- 2013
-
In: Geo-Marine Letters. - : Springer Science and Business Media LLC. - 0276-0460 .- 1432-1157. ; 33:1, s. 13-29
-
Journal article (peer-reviewed)abstract
- The Pagassitikos Gulf in Greece is a semi-enclosed bay with a maximum depth of 102 m. According to the present-day bathymetric configuration and the sea level during the latest Pleistocene, the gulf would have been isolated from the open sea, forming a palaeolake since 32 cal. ka b.p. Sediment core B-4 was recovered from the deepest sector of the gulf and revealed evidence of a totally different depositional environment in the lowest part of the core: this contained light grey-coloured sediments, contrasting strongly with overlying olive grey muds. Multi-proxy analyses showed the predominance of carbonate minerals (aragonite, dolomite and calcite) and gypsum in the lowest part of the core. Carbonate mineral deposition can be attributed to autochthonous precipitation that took place in a saline palaeolake with high evaporation rates during the last glacial-early deglacial period; the lowest core sample to be AMS C-14 dated provided an age of 19.53 cal. ka b.p. The palaeolake was presumably reconnected to the open sea at 13.2 cal. ka b.p. during the last sea-level rise, marking the commencement of marine sedimentation characterised by the predominance of terrigenous aluminosilicates and fairly constant depositional conditions lasting up to the present day.
|
|
