@article{fdi:010064480,
  title = {{D}egradation of riverine dissolved organic matter by seawater bacteria},
  author = {{R}ochelle {N}ewall, {E}mma and {P}izay, {M}.{D}. and {M}iddelburg, {J}.{J}. and {B}oschker, {H}.{T}.{S}. and {G}attuso, {J}.{P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he functional response of a seawater bacterial community transplanted into freshwater dissolved organic matter ({DOM}) was investigated together with the response of natural populations of bacteria to size-fractioned natural source water. {S}eawater bacteria were incubated over a period of 8 d in size-fractionated, freshwater {DOM} collected from {R}anders {F}jord, {D}enmark, during spring ({A}pril) and summer ({A}ugust) of 2001. {T}hree fractions were used: 0.2 mum filtered (<0.2 mum-{DOM}), >1 k{D}a (high molecular weight, {HMW}-{DOM}) and <1 k{D}a (low molecular weight, {LMW}-{DOM}). {T}he results were compared with parallel control incubations of freshwater bacteria in size-fractionated freshwater {DOM} and seawater bacteria in size-fractionated seawater {DOM}. {T}here were few differences in bacterial abundance ({BA}) and production ({BP}) within each incubation type in spring, but this was not the case in summer. {W}hile the seawater bacteria transplanted into freshwater {HMW}-{DOM} performed similarly to those in seawater {HMW}-{DOM}, freshwater bacteria in freshwater {HMW}-{DOM} exhibited higher {BA}, {BP} and bacterial respiration ({BR}), indicating a difference in the physiological abilities of the seawater bacterial assemblage compared to that of the natural freshwater assemblage. {B}acterial growth efficiency ({BGE}) varied between 11 and 41% and the highest values were generally in the {HMW}-{DOM} size fraction. {C}omparison of the 'bioavailability' of the {DOM} predicted from {BGE}, the amino acid degradation index ({DI}), dissolved organic carbon degradation rates and the bioavailability index showed that net change in {DI} of dissolved combined amino acids over the course of an incubation can be a good predictor of most of the other indices. {T}he separation of {DOM} into molecular weight size fractions resulted in different estimates of bioavailability than would have been predicted from the rates observed in the <0.2 mum-{DOM} fraction. {T}hese results further demonstrate the flexibility of bacteria in their ability to utilize different sources of {DOM}, and highlight the variability that can be observed when different indices are used to determine the bioavailability of organic matter to heterotrophic bacteria.},
  keywords = {bacterial growth efficiency ; {BGE} ; {HMW} ; {LMW} ; {DOM} ; {R}anders {F}jord {E}stuary ; amino acids ; degradation index ; {DI} ; {DANEMARK}},
  booktitle = {},
  journal = {{A}quatic {M}icrobial {E}cology},
  volume = {37},
  numero = {1},
  pages = {9--22},
  ISSN = {0948-3055},
  year = {2004},
  DOI = {10.3354/ame037009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064480},
}