, 2001), complementing existing freshwater invertebrate surveys of lakes on Macquarie Island (Dartnell et al., 2005). Surveys of stream invertebrates in AD 1992, 2008 and 2010 have already reported large compositional changes at sites exposed to grazing by rabbits (Marchant et al., 2011). In a wider context, the eradication of invasive species is increasingly becoming the goal of conservation management on other sub-Antarctic and oceanic islands around
the world (DOC, 2013, SGSSI, 2013 and SANAP, 2013). www.selleckchem.com/products/BMS-754807.html In all these cases a palaeoecological approach can provide an invaluable long-term perspective for quantifying ecosystem response and recovery after the eradication of the invasive species (Burney and Burney, 2007 and Connor et al., 2012). This study has demonstrated
that the introduction of rabbits on Macquarie Island led to unprecedented and statistically significant changes in Emerald Lake and its catchment from around the late AD 1800s. The scale and magnitude of these changes is unprecedented in at least the last ca. 7200 years. Sediment accumulation rates increased by >100 times due to increases in catchment erosion and within-lake production, and were accompanied by a fourfold increase in the total carbon and total nitrogen content of the sediments. A diverse diatom community was replaced by just two previously rare diatom species Fragilaria capucina and Psammothidium abundans; pioneer colonisers tuclazepam characteristic of rapidly changing environments. This study provides information on the scale of the impact together with one baseline against which the effectiveness of the remedial management, including PLX3397 clinical trial the very successful invasive species eradication programme, can be assessed. As similar eradication programmes are becoming increasingly common on sub-Antarctic islands, and islands elsewhere, this study demonstrates how palaeoecological methods may be used to provide a long-term perspective on both
natural and Anthropogenic forcing of ecosystems, the impact of invasive species and the effectiveness of management programmes aimed at restoring natural biodiversity. This study was funded by an Australian Antarctic Science grant (AAS 2663). Krystyna M. Saunders was funded by an Australian Postgraduate Award and an Australian Institute of Nuclear Science and Engineering Postgraduate Award. Access to Macquarie Island was granted by the Resource Management and Conservation Division, Department of Primary Industry, Parks, Water and the Environment. We would like to thank Donna Roberts for initially establishing the project, Bart Van de Vijver for taxonomic assistance, Keith Springer for background knowledge, technical and logistical support, John Gibson for discussions and contributing to 14C dating, and Sam Hagnauer for laboratory assistance. Comments by two anonymous reviewers helped to improve the manuscript.