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- W2036693808 abstract "Abstract The 13 C/ 12 C ratios of leaves of the conifer morphotype Frenelopsis were measured to decipher the influences of water and salt stress on stomatal density (SD), epidermal cell density (ECD) and stomatal index (SI). Three morphospecies were analyzed: F . ugnaensis from freshwater fluvio-lacustrine deposits (Upper Barremian), F . turolensis and alata from coastal deposits (Lower-Middle Albian and Upper Albian respectively). The cuticle δ 13 C values show a large variation from − 28‰ to − 21‰. Comparison with previously published marine carbonate δ 13 C records indicate that the difference in cuticle δ 13 C between the different deposits are mainly due to difference in CO 2 -plant isotope fractionation rather than to change in isotopic composition of inorganic carbon in the atmosphere and ocean. The less negative δ 13 C and wide range in δ 13 C of F . turolensis and alata (− 27.5 to − 21‰), compared to F . ugnaensis , (− 28 to − 25‰) are interpreted as a result of salt and/or water stress. The data as a whole yield a good relationship between the 13 C/ 12 C ratio and SD ( r = 0.67, n = 42, p r = 0.53, n = 41, p F. ugnaensis decreases with increasing δ 13 C value ( r = − 0.57, n = 15, p = 0.026) as well as a decrease of SI ( r = − 0.62, n = 15, p = 0.013), possibly reflecting warmer and drier conditions. Average SI of F. alata does not significantly change with δ 13 C and inferred soil salinity in contrast to SD ( p" @default.
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- W2036693808 date "2008-02-01" @default.
- W2036693808 modified "2023-10-18" @default.
- W2036693808 title "δ13C and stomatal number variability in the Cretaceous conifer Frenelopsis" @default.
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- W2036693808 doi "https://doi.org/10.1016/j.palaeo.2007.10.027" @default.
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