TITLE:     Effects of ultraviolet radiation on the behavior of krill larvae
           (euphausia superba)
AUTHOR:    Langdon B. Quetin, Raymond C. Smith, Karen Patterson (Speaker),
	   Robin M. Ross, Carol Wyatt and Holly Coe
DATE:      10-14 February 1997 
PLACE:     ASLO, Aquatic Sciences Meeting, Santa Fe, New Mexico
           Talk
ABSTRACT:  
 Krill in their first year of development (Age Class 0) feed on sea ice biota
in winter.  This behavior maintains AC0s in the surface waters in early
austral spring when UV levels may be unnaturally high due to the well
documented, seasonal development of the Antarctic "Ozone Hole".  During
October 1993, AC0s were maintained in plexiglass aquaria outside Palmer
Station, Antarctica.  Behavioral and relative chromatophore respones were
recorded at three hour intervals during the day for up to five days for
groups of AC0s maintained under three different but natural light regimes:
UVA + PAR (photosynthetically active radiation), PAR, and UVA,B + PAR. The
results clearly indicate that AC0 krill are negatviely impacted by high
levels of UV radiation.  However, the results suggest also that the
behavioral response by AC0s to the high levels of UV in the experiment may
confer protection from UV in their natural habitat.