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Poster De Conférence Année : 2017

Study of guano from New Caledonia

Etude du guano de Nouvelle-Calédonie

Résumé

Following palaeoenvironmental studies in New Caledonia and Vanuatu carried out on lacustrine sediments (Combettes et al., 2016a, Combettes et al., 2016b, Sémah et al. 2016), our choice was concerned with a proxy allowing a higher resolution. First, with speleothems then, recently, with guano. Indeed, we observe numerous records of guano in the ‘Grande Terre’ and Loyalty Islands in New Caledonia. First results underlined, in pluridisciplinary studies with pollen, ɗ 13C, ɗD and n-alkane (n-C 29 ), (Sémah et al. 2015, Wirrmann et al. 2016, Wirrmann et al. 2017), that it is possible to correlate the guano content with strict environmental parameters. Two kinds of guano are studied: from salanganes, Collocalia spodiopygia, diurnal and insectivorous and from a bat, Micropterus robustior, nocturnal and insectivorous as well. Therefore, we associate now the pollen content and the remains of insects included in the guano. The determination of insects and their analysis will allowed us to refine the climatic parameters being during the guano formation. Currently we carry out a surface samples calibration based, in the guano of Hama cave (Loyalty Islands), on the pollen content and then the periods of flowering, the insect’s remains content with their environmental characters and the measured meteorological data. This pluridisciplinary study allows us to strictly link climatic parameters with the guano content and to use them to reconstruct palaeoclimate and palaeoenvironment during the past.
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Dates et versions

hal-04605005 , version 1 (07-06-2024)

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Jérémy Rollin, Anne-Marie Sémah, Denis Wirrmann. Study of guano from New Caledonia. Medpayno symposium 2017, Sep 2017, Barcelona, Spain. ⟨10.1016/j.crpv⟩. ⟨hal-04605005⟩

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