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


Material Information

A long record of environmental change from bat guano deposits in Makangit Cave, Palawan, Philippines
Series Title:
Earth and Environmental Science Transactions of The Royal Society of Edinburgh
Bird, Michael I.
Boobyer, Ella M.
Bryant, Charlotte W. Edryd Stephens
Lewis, Helen A.
Paz, Victor
Stephens, W. Edryd
Cambridge University Press
Publication Date:
Physical Description:
1 online resource


Subjects / Keywords:
Guano ( lcsh )
Climatic changes ( lcsh )
caves ( lcsh )
serial ( sobekcm )
Asia -- Philippines -- Palawan


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 Version:
Volume 98, issue 1

Record Information

Source Institution:
University of South Florida
Holding Location:
University of South Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
K26-05376 ( USFLDC DOI )
k26.5376 ( USFLDC Handle )

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