@article{fdi:010074139,
  title = {{C}limate ultrastructure and aquatic community response to {H}einrich {S}tadials ({HS}5a-{HS}1) in the continental northern {N}eotropics},
  author = {{C}ohuo, {S}. and {M}acario-{G}onzalez, {L}. and {P}erez, {L}. and {S}ylvestre, {F}lorence and {P}ailles, {C}. and {C}urtis, {J}. {H}. and {K}utterolf, {S}. and {W}ojewodka, {M}. and {Z}awisza, {E}. and {S}zeroczynska, {K}. and {S}chwalb, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e reconstruct environmental conditions of the period 53-14 kyr {BP} in the continental northern {N}eotropical region. {W}e evaluate in detail the magnitude of climatic fluctuations and their effects on aquatic communities during six {H}einrich {S}tadials ({HS}1-{HS}5a), using sediments from {L}ake {P}eten {I}tza, {G}uatemala, and a multiproxy approach. {I}n {L}ake {P}eten {I}tza typical {H}einrich {S}tadials ({HS}s) are recorded in sediments as alternations of gypsum and clay, and abrupt changes in magnetic susceptibility, {C}a{CO}3 and biological compositions. {T}his suggests that {HS}s were periods of hydrological unbalance, characterized by dry spells, punctuating the predominant humid conditions characterizing the period 53-14 kyr {BP}. {T}he ultrastructure of {HS}s allows us to identify four different types of climatic conditions associated to {HS}s: 1) prevailing dry conditions but changing to humid ({HS}5, {HS}3); 2) predominantly humid conditions but changing to arid ({HS}2); 3) fluctuating humid-dry-humid ({HS}4, {HS}1 ); and 4) arid with high lake water conductivity ({HS}5a). {T}he continuous presence of tropical ostracode species during {HS}s suggests that lake water temperatures were not drastically lowered. {O}stracode-based transfer functions indicate that during {HS}s, epilimnetic water temperatures decreased by 1-3 degrees {C} compared to mean modern temperatures. {L}ake solute composition and conductivity were strongly affected by {HS}s. {D}uring {HS}5a and {HSI} we estimate conductivity values > 800 mu {S} cm(-1). {D}iversity indices show significant differences ({F}-5,{F}-70 = 3.74, p = 0.004) of ostracode species composition among {HS}s. {H}ighest diversities occurred during {HS}5a, {HS}4 and {HS}1, which display greater climatic alterations than the other {HS}s. {F}luctuating climates seem to have exerted positive effects on diversity of aquatic communities by producing an increase in habitat heterogeneity.},
  keywords = {{Q}uaternary ; {P}aleolimnology ; {C}entral {A}merica ; {M}icropaleontology ; {M}ultiproxy approach ; {T}ransfer functions ; {GUATEMALA} ; {PETEN} {ITZA} {LAC}},
  booktitle = {},
  journal = {{Q}uaternary {S}cience {R}eviews},
  volume = {197},
  numero = {},
  pages = {75--91},
  ISSN = {0277-3791},
  year = {2018},
  DOI = {10.1016/j.quascirev.2018.07.015},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074139},
}