@article{fdi:010064487,
  title = {{E}ffect of solar ultraviolet radiation on bacterio- and phytoplankton activity in a large coral reef lagoon (southwest {N}ew {C}aledonia)},
  author = {{C}onan, {P}. and {J}oux, {F}. and {T}orr{\'e}ton, {J}ean-{P}ascal and {P}ujo-{P}ay, {M}. and {D}ouki, {T}. and {R}ochelle {N}ewall, {E}mma and {M}ari, {X}avier},
  editor = {},
  language = {{ENG}},
  abstract = {{M}easurements of underwater solar ultraviolet radiation ({UV}-{R}, 280 to 400 nm), particulate ({PPP}) and dissolved ({DPP}) primary and bacterial ({BP}) production allowed us to infer the respective contribution of {UV}-{B} (280 to 315 nm) and {UV}-{A} (315 to 400 nm) in algal-bacterial interactions in the southwest lagoon of {N}ew {C}aledonia. {D}ifferences in and between activities were assessed by in situ exposure of plankton to full sun radiation and shielded for {UV}-{B} or {UV}-{R}. {W}e found a coherent response of phytoplankton and bacteria in total {UV}-{R} inhibition. {T}he deepest limit of {UV}-{R} influence was 8 m, and inhibition increased with oligotrophy to reach 55 % for phytoplankton and 75 % for bacteria, at 1 m depth. {UV}-{B} contributed up to 50 % to the inhibition, especially near the surface and at the oligotrophic station. {T}he {UV}-{A} effect on {PPP} was stronger than that of {UV}-{B}; however, bacteria were more sensitive to {UV}-{B} than were phytoplankton. {W}hen considering {UV}-{A} and {UV}-{B} separately, the inhibition response was linear without threshold. {H}owever, a threshold of 0.002 for {PPP} and 0.004 for {BP} was obtained when considering the ratio {UV}-{B}:{UV}-{A}. {T}he rate of {PPP} normalized to chlorophyll concentration ({PP}chl) is proposed to reconcile the large range of inhibition encountered in the literature. {A} significant linear relationship predicted a {PPP} inhibition of 60 % in surface water with no significant effect on excretion for cells characterized by a low {PP}chl, whereas {PPP} inhibition should be limited for cells characterized by a {PP}chl higher than 18 mg {C} (mg chl)(-1) h(-1), even if excretion ({DPP}) could be slightly stimulated.},
  keywords = {{U}ltraviolet radiation ; {U}v-a ; {U}v-b ; {B}acterioplankton ; {P}hytoplankton ; {P}roductivity ; {I}nhibition ; {D}na damage ; {NOUVELLE} {CALEDONIE} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{A}quatic {M}icrobial {E}cology},
  volume = {52},
  numero = {1},
  pages = {83--98},
  ISSN = {0948-3055},
  year = {2008},
  DOI = {10.3354/ame01204},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064487},
}