@article{fdi:010060494,
  title = {{A} late {H}olocene palaeoenvironmental record from {L}ake {T}izong, northern {C}ameroon using diatom and carbon stable isotope analyses},
  author = {{N}guetsop, {V}. {F}. and {B}entaleb, {I}. and {F}avier, {C}. and {B}ietrix, {S}. and {M}artin, {C}. and {S}ervant {V}ildary, {S}imone and {S}ervant, {M}ichel},
  editor = {},
  language = {{ENG}},
  abstract = {{A} late {H}olocene record, based on diatom and stable carbon isotopes from {L}ake {T}izong, northern {C}ameroon, provides a history of environmental changes over the last 4100 years. {S}everal coarser sediment layers among which the two younger ones are of pyroclastic origin interrupt the fine clayey sediment of the core. {T}he detailed chronology of the core supported by 24 radiocarbon {C}-14 dates and proxies data results revealed an erosive phase registered in the sedimentary column from 2200 to 1500 cal {BP}. {T}he diatom ecological groups suggest that between 4100 and 2800 cal yrs {BP}, the lake level was much higher than after corresponding to a relatively greater precipitation minus evaporation ({P} {E}) ratio, as well as increased runoff in the lake catchment. {T}hese conditions were favourable to the development of {C}3 plants in the lake catchment as indicated by lower delta {C}-13 values and higher {C}/{N} ratios than after. {T}his hydrological phase is also characterized by eutrophic, turbid and probably circum-neutral to alkaline waters. {A}fter this episode, higher delta {C}-13 values between 2800 and 2500 cal {BP} suggest increased water use efficiency of terrestrial plants and/or potentially more {C}4 plant debris input into the lake: an indication of savannas patches developing, due probably to changes in the rainfall distribution. {M}arked lake-level declines are recorded at 2500, 2200-2100, and at 1400-1000 cal yrs {BP}. {T}hese low-stands are characterized by higher inputs of windblown diatoms (up to 4.2%) than before, which confirms that the {NE} trade-winds were strengthening. {T}his corresponds primarily to a reduction in the {P} {E} ratio, but probably also to greater inter-annual or seasonal variability when drier periods or seasons became more prolonged and intense than previously. {C}onsequently, savannas were maintained as suggested by relatively higher than before delta {C}-13 values, as well as independently supported by regional pollen data. {A}fter 1000 cal {BP}, the lake-level rose towards sub-modern conditions, with a deep neutral and eutrophic water column. {C}arbon stable isotopes suggest a reduction of organic matter input, while savannas were maintained despite the return to more humid conditions. {T}he trends of climatic changes observed in the {L}ake {T}izong reveal the variability in timing, magnitude and regional extent of known climatic events.},
  keywords = {{L}ate {H}olocene ; {N}orthern-{C}ameroon ; {D}iatoms ; {C}arbon isotopes ; {P}alaeoenvironments ; {P}alaeoclimates ; {CAMEROUN}},
  booktitle = {},
  journal = {{Q}uaternary {S}cience {R}eviews},
  volume = {72},
  numero = {},
  pages = {49--62},
  ISSN = {0277-3791},
  year = {2013},
  DOI = {10.1016/j.quascirev.2013.04.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060494},
}