A long record of environmental change from bat guano deposits in Makangit Cave, Palawan, Philippines

Michael I. Bird*, Ella M. Boobyer, Charlotte Bryant, Helen A. Lewis, Victor Paz, W. Edryd Stephens

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    We present the first record of Holocene and Pleistocene environmental change derived from the chemical and stable-isotope composition of a tropical cave guano sequence from Makangit Cave in northern Palawan (Philippines). The 180 cm sequence of guano, derived predominantly from insectivorous bats and birds, consists of two distinct units. An upper section of reddish-brown oxidised guano to 110 cm was deposited since the mid-Holocene while a lower section of black, reduced guano was deposited through the Last Glacial Maximum (LGM) to >30 000 BP. Carbon-isotope (δ13C) values in guano deposited during the LGM are as high as -13.5‰ indicating that a C4 -dominated grassland existed in the area around the cave at this time. Guano δ13C values of -25‰ to -28‰ suggest that this open vegetation was replaced by C3-dominated closed tropical forest, similar to that of the present, by the mid-Holocene. The results suggest that the climate of northern Palawan was substantially drier at the LGM than is currently the case.

    Original languageEnglish
    Pages (from-to)59-69
    Number of pages11
    JournalEarth and Environmental Science Transactions Of The Royal Society Of Edinburgh
    Volume98
    Issue number1
    DOIs
    Publication statusPublished - Mar 2007

    Keywords

    • Carbon-isotope
    • Palaeoenvironment
    • Quaternary
    • Radiocarbon
    • Sundaland

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