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The effects of ultraviolet ( U V ) r a d ~ a t ~ o n on thymldine and leucine incorporation were evarmned In surface waters from the Gulf of Mexico and Santa Rosa Sound a mesotrophlc estuary In no] thwest Florida USA Whole dnd 0 8 ].[m flltered surface waters were incubated w ~ t h 3 H t h y m ~ ~ n e and 14C-leucine in IJV transparent containers under natural solar radlatlon Solar radlation was either not filtered (samples exposed to UV-B UV-A and photosynthetically active radlatlon PAR), filtered through Mylar 500D (samples exposed to UV-A and PAR), or filteled through Acryllte OP3 (samples exposed only to PAR) I11 Santa Rosa Sound thymldine lncorporatlon was lnhlblted an average of 44 % relatlve to dark controls when exposed to unflltered solar radlatlon PAR contnbuted 23% to the total thynudlne ~ n h i b i t ~ o n lvhlle UV-A and UV-B contributed 37 % and 39% respectively to total inhlb~tion Leuc~ne incorporation In Santa Rosa Sound was lnhlblted 29% by full solar r a d ~ a t ~ o n The malonty of the total l e u c ~ n e inhlb~tlon was due to UV-B (83%) whlle PAR only treatments showed leucine lncorporatlon rates 1 0 " ~ higher than dark controls For the Gulf of Mexico expenments full solar radlation ~nhlbi ted thym~dine inco~polatlon approximately twlce as much as leuclne lncorporatlon However there were no consistent patterns In differences due to d~fferent wavelengths Both thymidlne and l euc~ne incorporation were lnhlbited to a greater extent ~n < 0 8 pm filtered water samples than In whole water samples suggesting that the presence of primary producers may mediate the de t~ lmen ta l effects of solar radiation on bacterioplankton Surface rvater was also incubated In s ~ t u wlth thymidlne at flved depths in UV transparent and darkened containers at 3 locations in the Gulf of b l ex~co Total ~nhlbltion was 60 to 70% at the surface and was evldent to 15 m Comparison with radiometric data and DNA doslmeters lndlcated that UV-B exerted the greatest effect In the upper 5 m vvhlle below that the lnhlbltion was most l~ke ly due to longer wavelengths Our results suggest that both UV and visible solar radlation can negatively affect bacterial metabolism and fallure to take Into account the effects of light may result In the overes t~rnat~on f bacterioplankton production in surface waters

Inhibition of bacterial activities by solar radiation in nearshore waters and the Gulf of Mexico