Variability of euphausiid larvae densities during the 2011, 2012, and 2014 summer seasons in the Atlantic sector of the Antarctic

FRANZOSI CLAUDIO; ENRIQUE MARSCHOFF; TOSSONOTTO GABRIELA; EMILCE ROMBOLÁ; ALDER VIVIANA

Polar Science

National Institute of Polar Research

Año: 2018 p. 86 - 93

1873-9652

Euphausiid larvae were collected in the Weddell Scotia Confluence region in summer 2011, in the West AntarcticPeninsula and Scotia Sea in 2012, and in the South Orkneys Shelf in 2014. From 2011 to 2014 the larval stagesgeographic distribution and the distribution of water masses were consistent with published information. Thedensities observed were compared between the cruises and with the 1981 and 1995 values by means of a kernelestimate of absolute and relative densities at a fixed grid of points. The values of Thysanoessa macrura werehigher in 2011 and 2012 and those of Euphausia superba were lower than those observed in 1981 and 1995.Euphausia frigida did not show significant variations in absolute density but their relative values were higherthan those of E. superba. No significant variations were observed in absolute values between 1981 and 1995. Theopposite pattern was found in 2014, with significantly higher densities of E. superba than those of T. macrura.No single factor could be identified to explain these variations in density, suggesting the existence of complexmechanisms coupling the reproductive biology with oceanographic phenomena. Their description will requireample spatial and temporal monitoring rather than locally detailed observations.