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We examlned the effects of solar ultrav~olet ~ a d ~ a t ~ o n (UVR) and phosphorus enrichment on m ~ c r o b ~ a l food web structure In a subarc t~c o l~go t roph~c lake (Lac a I Eau C l a ~ r e Canada l a t~ tude 56"10 N long~tude 74"30 W) uslng repl~cated , 20 l polyethylene contamers Incubated In sltu The expenments were run for between 6 and 9 d at the surface of the lake at 3 tlmes dunng the summer open water perlod Chlorophyll a (chl a ) production of the > 2 pm fraction of the phytoplankton communlty was stimulated by P t h ~ s response was reduced on average by 31 % in the presence of U\/-A and by an addi t~onal 29% in the presence of UV-B Conversely the <2 pm chl a fraction declined \mth P enrichment but to a lesser extent In the presence of UV-B Cell counts of plcocyanobacteria hhowed a decrease under P ennchment w ~ t h s~gnificantly greater declines Induced by UV-A and add~tionally by UV-B The nanoflagellate community Increased In cell concentrat~on In response to P add i t~on but only in the absence of UV-A Bacter~al cell concentrat~ons In the P enrichments remained close to or slightly above (up to 20%) the init~al values but sharply dec l~ned In the treatments without P add~ t ion the posltive effect of enrichment was not influenced by UV-A or by UV-B T h ~ s diverse array of responses unplies that shlfts In underwater UVR caused by changes In spectral penet ra t~on through the atmosphere (ozone deple t~on) or water column (changes In d~ssolved organlc carbon) \v111 influence mlcrob~al t roph~c structure as well as productiv~ty w l t h ~ n suba rc t~c lakes Such effects, however w ~ l l be l im~ted to aquatic environments that are naturally exposed to h ~ g h UVR such as shallow water columns or surface waters d u r ~ n g dlurnal s t r a t ~ f ~ c d t ~ o n

Microbial food web responses to phosphorus supply and solar UV radiation in a subarctic lake