@article{fdi:010075298,
  title = {{E}valuation of 3-hydroxy fatty acids as a p{H} and temperature proxy in soils from temperate and tropical altitudinal gradients},
  author = {{H}uguet, {A}. and {C}offinet, {S}. and {R}oussel, {A}. and {G}ayraud, {F}. and {A}nquetil, {C}. and {B}ergonzini, {L}. and {B}onanomi, {G}. and {W}illiamson, {D}avid and {M}ajule, {A}. and {D}erenne, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}hree hydroxy (3-{OH}) fatty acids ({FA}s), containing 10 to 18 {C} and a hydroxyl group in third position are characteristic components of {G}ram-negative bacteria. {T}hese compounds were used previously to detect and quantify {G}ram-negative bacterial communities in various types of samples, from terrestrial, aquatic and atmospheric environments. {T}he relative abundance of 3-{OH} {FA}s in soils was recently shown to vary with mean annual air temperature ({MAAT}) and p{H} in soils from {M}t. {S}hennongjia ({C}hina). {I}n the current study, the concentrations and abundances of 3-{OH} {FA}s were determined in soils from altitudinal transects under tropical and temperate climates: {M}t. {R}ungwe ({SW} {T}anzania) and {M}t. {M}ajella ({C}entral {I}taly), respectively. {T}he aim was to (i) examine and compare the distributions of 3-{OH} {FA}s in soils from different climatic zones and (ii) to investigate the potential of 3-{OH} {FA}s as temperature and p{H} proxies. {W}hen combined with previously published data, a moderate correlation ({R}-2 0.62) between the summed iso and anteiso to the total amount of normal 3-{OH} {FA}s ({RIAN} index) and p{H} was obtained. {W}e show that {G}ram-negative bacteria respond in the same way to temperature variations in soils from different latitudes, with a relative increase of the anteiso to normal 3-{OH} {FA} ratios of the {C}-15 and {C}-17 compounds ({RAN}(15) and {RAN}(17) indices, respectively) with decreasing temperature. {N}evertheless, the intercepts of the relationships between {RAN}(15) and {MAAT} are mountain-dependent, suggesting that regional calibrations may be required to use {RAN}(15) as a temperature proxy. {I}n contrast with {RAN}(15) , the statistical similarity of the local relationships between {RAN}(17) and {MAAT} leads to a combined calibration ({R}-2 0.60, residual mean error 5.1 degrees {C}) covering a wide range of temperature (ca. 0-25 degrees {C}). {A}s 3-{OH} {FA}s seem well-preserved in sedimentary archives, this strengthens the potential of these compounds as a temperature and p{H} proxy for paleoreconstructions in terrestrial settings.},
  keywords = {3-{H}ydroxy fatty acids ; {S}oils ; {A}ltitudinal transects ; {E}nvironmental proxies ; {ITALIE} ; {TANZANIE} ; {ZONE} {TEMPEREE} ; {ZONE} {TROPICALE} ; {ZONE} {MEDITERRANEENNE}},
  booktitle = {},
  journal = {{O}rganic {G}eochemistry},
  volume = {129},
  numero = {},
  pages = {1--13},
  ISSN = {0146-6380},
  year = {2019},
  DOI = {10.1016/j.orggeochem.2019.01.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075298},
}