Abstract
Through the continuing accumulation of fossil evidence, it is clear that first human arrival on islands around the world was linked to a rise in the extinction rate for vertebrates. Bones in human-era fossil sites can also reveal changes in the composition and structure of ecological communities due to human environmental impacts. New Caledonia is a large and biogeographically distinct island in the southwest Pacific and is considered a critical priority for biodiversity conservation. We examined fossil birds from the Mé Auré Cave site (WMD007), located in lowland dry forest on the west coast of New Caledonia. Accumulation of bird skeletal material in the cave was primarily through deposition in barn owl (Tyto alba) pellets. The site recorded the island-wide extinction of two species and extirpation of at least two other species from the lowlands in the past 1200 years. Species richness of birds in the stratigraphic deposit was quite high, reflecting the catholic diet of barn owls on islands, and many species have continued to persist near the site despite loss and degradation of the dry forest. However, we found substantial turnover in relative abundance of species in the cave deposit, with edge and open country birds becoming more common through time. These changes may reflect the severe reduction of dry forest habitat during the colonial period. This work provides a temporal record of avifaunal and environmental change in the threatened dry forest habitat that should be particularly informative for ongoing conservation and restoration efforts.
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Acknowledgements
We are grateful to F. Desmoulins and the Programme de Conservation des Forêts Sèches for providing bird survey data from the Deux Frères forest and to Mr. G. SantaCroce for access to the Me Aure Cave site. P. Maurizot and C. Sand provided valuable advice that enabled our fieldwork in New Caledonia. We thank A. Wiley for pretreatment of the barn owl bones for radiocarbon dating. We thank D. Steadman and curatorial staff at the Florida Museum of Natural History and the National Museum of Natural History (NMNH) for their assistance. Funding was provided by a Smithsonian Institution Postdoctoral Fellowship to AGB and a NMNH grant to HFJ and AGB. The project was also partially supported by a National Science Foundation Postdoctoral Research Fellowship in Biological Informatics (DBI-0805669) to AGB.
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Appendix 1: Comparative material examined
Appendix 1: Comparative material examined
The primary reference collection used for fossil identification was composed of the following USNM skeletal specimens collected in New Caledonia: Gallirallus philippensis (USNM 561546), Porphyrio porphyrio poliocephalus (USNM 561549), Chalcophaps indica (USNM 561556), Columba vitiensis hypoenochroa (USNM 561555), Drepanoptila holosericea (USNM 562454), Ducula goliath (USNM 561561), Eunymphicus cornutus uvaeensis (USNM 561563), Cacomantis flabelliformis pyrrhophanus (USNM 561571), Tyto alba lulu (USNM 561574), Collocalia spodiopygia (USNM 561589), Todiramphus sanctus (USNM 561607), Lichmera incana (USNM 561807), Myzomela sanguinolenta caledonica (USNM 561808), Philemon diemenensis (USNM 561824), Phylidonyris undulata (USNM 561812), Gerygone flavolateralis (USNM 561669), Eopsaltria flaviventris (USNM 561676), Pachycephala caledonica (USNM 561710), Pachycephala rufiventris (USNM 561733), Rhipidura fulignosa (USNM 561693), Rhipidura spilodera (USNM 561707), Myiagra caledonica (USNM 561681), Clytorhynchus pachycephaloides (USNM 561680), Corvus moneduloides (USNM 561641), Lalage leucopyga (USNM 561831), Artamus leucorhynchus (USNM 561620), Coracina analis (USNM 561665), Coracina caledonica (USNM 561660), Aplonis striata (USNM 561614), Acridotheres tristis (USNM 561835), Zosterops lateralis (USNM 561795), Zosterops xanthrochrous (USNM 561754), Megalurulus mariei (USNM 400088), Erythrura psittacea (USNM 561844), Estrilda astrild (561845). We also made reference to over 50 additional skeletons from the southwest Pacific in the USNM and Florida Museum of Natural History (UF) collections, including: Turnix varius (USNM 500632), Gallirallus philippensis (USNM 560651, UF 42933, UF 43177), Porzana tabuensis (USNM 345124), Poliolimnas cinereus (USNM 560913), Columba vitiensis (UF 28543), Ducula pacifica (USNM 559586), Ptilinopus superbus (USNM 489040), Ptilinopus rivoli (USNM 489043), Ptilinopus greyii (UF 43162, UF 39593), Ptilinopus tannenensis (UF 42921), Gallicolumba stairii (USNM 576854), Gallicolumba beccarii (USNM 615012), Gallicolumba criniger (USNM 346463, UF 45053), Gallicolumba luzonica (USNM 346847, UF 19438), Gallicolumba rubescens (USNM 290145), Gallicolumba rufigula (UF 41434), Chalcophaps indica (UF 42904), Chalcophaps stephani (USNM 615011), Streptopelia chinensis (USNM 501286, UF 27711), Macropygia amboinensis (USNM 489045, UF 41528), Macropygia phasianella (USNM 612672), Eunymphicus cornutus (UF 44707), Charmosyna papou (USNM 613778, UF 39659), Charmosyna placentis (USNM 558317), Cyanorhamphus novaezelandiae (USNM 344438, UF 25958), Trichoglossus haematodus (USNM 612678, UF 43165), Chrysococcyx lucidus (USNM 620222, UF 39514), Eudynamys scolopacea (UF 41473), Tyto alba (USNM 559804), Hirundo tahitica (USNM 620241), Turdus poliocephalus (USNM 613705), Poliolimnas cinereus (USNM 560913).
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Boyer, A.G., James, H.F., Olson, S.L. et al. Long-term ecological change in a conservation hotspot: the fossil avifauna of Mé Auré Cave, New Caledonia. Biodivers Conserv 19, 3207–3224 (2010). https://doi.org/10.1007/s10531-010-9887-9
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DOI: https://doi.org/10.1007/s10531-010-9887-9