Effects of UV Radiation and Temperature in Cold-adapted Calanoid Copepods From Patagonia (Argentina): Bioaccumulation of Photoprotective Compounds and Mortality Trends.

DIÉGUEZ, MARÍA DEL CARMEN; PATRICIA GARCÍA,; PÉREZ, ALEJANDRA PATRICIA; ZAGARESE, HORACIO

Lake Tahoe, Incline Village, Nevada (EEUU)

Conferencia; Chapman Conference on Lakes and Reservoirs as Sentinels, Integrators, and Regulators of Climate Change. 8–10 de Septiembre 2008; 2008

American Geophysical Union

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0in; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:ES; mso-fareast-language:ES;} @page Section1 {size:8.5in 11.0in; margin:70.85pt 85.05pt 70.85pt 85.05pt; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} --> In this work we analyse empirically the effects of UV radiation in a temperature gradient in two Boeckella species with different distribution patterns.  Boeckella antiqua is resctricted to a few ponds located in North western Patagonia (Argentina) while B. gracilis occurs along a long latitudinal gradient from 6º N in Colombia to 49º S in Patagonia, Argentina.  In both species we studied the bioaccumulation of the photoprotective compounds (mycosporine like amino acids and carotenoids) as well as mortality and clutch size in different radiation treatments and along a temperature gradient (5 to 20 º C). In both species, at least one of the rates involved in PPCs bioaccumulation related significantly to temperature. Furthermore, in both Boeckella mortality increased with temperature and UV. The interaction of these variables was also significant suggesting that increase in temperature to generate photo-toxicity stress in Boeckella species.