Millennial-scale fluctuations of the European Ice Sheet at the end of the last glacial, and their potential impact on global climate

Reconstructing Northern Hemisphere ice-sheet oscillations and meltwater routing to the ocean is important to better understand the mechanisms behind abrupt climate changes. To date, research efforts have mainly focused on the North American (Laurentide) ice-sheets (LIS), leaving the potential role of the European Ice Sheet (EIS), and of the Scandinavian ice-sheet (SIS) in particular, largely unexplored. Using neodymium isotopes in detrital sediments deposited off the Channel River, we provide a continuous and well-dated record for the evolution of the EIS southern margin through the end of the last glacial period and during the deglaciation. Our results reveal that the evolution of EIS margins was accompanied with substantial ice recession (especially of the SIS) and simultaneous release of meltwater to the North Atlantic. These events occurred both in the course of the EIS to its LGM position (i.e., during Heinrich Stadial –HS– 3 and HS2; ∼31–29 ka and ∼26–23 ka, respectively) and during the deglaciation (i.e., at ∼22 ka, ∼20–19 ka and from 18.2 ± 0.2 to 16.7 ± 0.2 ka that corresponds to the first part of HS1). The deglaciation was discontinuous in character, and similar in timing to that of the southern LIS margin, with moderate ice-sheet retreat (from 22.5 ± 0.2 ka in the Baltic lowlands) as soon as the northern summer insolation increase (from ∼23 ka) and an acceleration of the margin retreat thereafter (from ∼20 ka). Importantly, our results show that EIS retreat events and release of meltwater to the North Atlantic during the deglaciation coincide with AMOC destabilisation and interhemispheric climate changes. They thus suggest that the EIS, together with the LIS, could have played a critical role in the climatic reorganization that accompanied the last deglaciation. Finally, our data suggest that meltwater discharges to the North Atlantic produced by large-scale recession of continental parts of Northern Hemisphere ice sheets during HS, could have been a possible source for the oceanic perturbations (i.e., AMOC shutdown) responsible for the marine-based ice stream purge cycle, or so-called HE's, that punctuate the last glacial period.

First observation on neustonic plastics in waters off NW Spain (spring 2013 and 2014)

This paper examines the presence and distribution of plastic particles in waters off the NW Spanish Atlantic coast. A pilot sampling program was initiated in 2013 to study the presence of plastic particles in surface waters. A total of 41 neuston samples were collected using a manta trawl fitted with a 333 μm mesh (21 samples in 2013 and 20 samples in 2014). Several types of plastic particles were observed in 95% of the stations. A total of 1463 plastic microparticles (<5 mm; mps) and 208 mesoparticles (>5 mm and <20 mm; MPS) were counted. Average concentrations recorded were 0.034 ± 0.032 and 0.176 ± 0.278 mps m−2 and 0.005 ± 0.005 and 0.028 ± 0.043 MPS m−2, respectively for 2013 and 2014. Results on this emerging topic are discussed as a preliminary step towards implementation of the Marine Strategy Framework Directive in the region. Harmonization of protocols for determination of plastic particles is urgently needed in order to compare results between regions and to ensure coherence in the implementation of the MSFD. This aspect is also important at a worldwide scale.

First record of Pagellus bellottii (Teleostei: Sparidae) in the Bay of Biscay, France

The red pandora, Pagellus bellottii Steindachner, 1882, is a tropical and subtropical demersal Sparidae (Porgies) that lives over hard or sandy bottoms in coastal marine waters. It mostly occurs at depths ranging from 10 to 50 metres. It is distributed in the eastern Atlantic, from the Strait of Gibraltar to Angola and the Canary Islands where it is occasionally recorded (Bauchot and Hureau, 1986; Franqueville, 1983). The species is also recorded in the southwestern Mediterranean, in the Alboran Sea, off the Algerian coasts and in the Gulf of Gabes (Oral, 2010). The records of the species in the eastern Mediterranean, Syrian and Israeli waters (Fricke, et al. 2014, Fig. 1) is questioned. We consider these records are misidentification of Pagrus pagrus (Linnaeus, 1758). Pagellus bellottii was also included in the checklist of the fishes from Portugal as a consequence of records coming from the Algarve region, about 36°59′ N, 8° W, the northernmost records in Atlantic waters (de Castro, 1967; Erzini et al., 1996; Carneiro et al., 2014; Carneiro com. pers.). Some specimens were also recorded in Spanish Mediterranean waters, in the Bay of Almería about 36°47′ N, 2°25′ W (Lucena, et al. 1982), the northernmost records for the Mediterranean waters. Herein, the first record of P. bellottii in the Bay of Biscay is reported.