Signification environnementale de guano de salanganes et de chiroptères de Nouvelle-Calédonie. Premiers résultats

Citation

Material Information

Title:
Signification environnementale de guano de salanganes et de chiroptères de Nouvelle-Calédonie. Premiers résultats
Series Title:
Quaternaire
Creator:
Wirrmann, Denis
Sémah, Anne‑Marie
Mendez‑Millan, Mercedes
Schmidt, Sabine
Boissenin, Mélanie
Boucher, Hugues
Bouloubassi, Ioanna
Brescia, Fabrice
Cetin, Fethiye
Djouarev, Irina
Klein, Vincent
Publisher:
French Quaternary Association
Publication Date:
Physical Description:
1 online resource

Subjects

Subjects / Keywords:
Guano ( lcsh )
Climatic changes ( lcsh )
Caves
Genre:
serial ( sobekcm )
Location:
Oceania -- New Caledonia -- Nouvelle-Calédonie

Notes

Abstract:
Guano accumulated in caves by bats or birds contains a stratigraphic record of the environment which may supplement or supply conventionnal terrestrial sedimentary records like lacustrine/palustrine deposits or peat. Thus, guano study allows the understanding of recent or past climate and environment changes, which ability has expanded recently with the development of more sophisticated analytical tools, based on proxies that are indirect measures of past climates or environments preserved in natural archives. In New Caledonia, diurnal cave swiftlet Collocalia spodiopygia and nocturnal Chiroptera Micropterus robustior, both insectivores, share very often the same cavities. The comparison of the content of pollen and isotopes δ13C and δD in their respective guano, shows a great variability of constituents which reflects the sources of the feeding grounds of the eaten preys and their interaction with the ecosystem, more particularly the vegetation. The high richness of pollen taxa, identical to 50 % between the two guanos, underlines the respective food resource areas. The pollen content also shows seasonal variations probably in response to changes in food availability and in turn environmental change, if not climatic changes. This paper presents a preliminary set of results obtained on the 92cm-long core HAK1 retrieved in a guano mound taken under a cave swiftlet roost site in Hama Cave from Lifou (Loyalty Islands). The comparison between yearly mean daily rainfall, carbon (δ13C) and hydrogen (δD) isotopes compositions of high-molecular-weight n-alkane (n-C29) from guano shows a good covariation, which is interpreted as a proxy of ENSO occurrences. Our work confirms that the guano piles are promising records for palaeoenvironmental change studies at high temporal resolution.
Original Version:
Volume 28, Issue 3

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:
K26-05469 ( USFLDC DOI )
k26-5469 ( USFLDC Handle )

USFLDC Membership

Aggregations:
University of South Florida
Karst Information Portal

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serial

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