A long record of environmental change from bat guano deposits in Makangit Cave, Palawan, Philippines
Bird, Michael I., Boobyer, Ella M. , Bryant, Charlotte, Lewis, Helen A., Paz, Victor, and Stephens, W. Edryd (2007) A long record of environmental change from bat guano deposits in Makangit Cave, Palawan, Philippines. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 98 (1). pp. 59-69.
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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.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||carbon-isotope; palaeoenvironment; Quaternary; radiocarbon; Sundaland|
|Date Deposited:||03 Oct 2011 00:43|
|FoR Codes:||04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040606 Quaternary Environments @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970121 Expanding Knowledge in History and Archaeology @ 100%|
|Citation Count from Web of Science||