Butterflies Australia: a national citizen science database for monitoring changes in the distribution and abundance of Australian butterflies

Conservation biology is a field of science that is heavily biased against insects and allied invertebrates, largely due to a data deficiency feedback loop that maintains a cycle of ignorance and inaction. Because many invertebrate groups are, and remain, extremely data poor, it is frequently difficult to conduct even the most basic conservation actions, such as status evaluation, listing, recovery and monitoring of threatened species. Thus, declines and extinctions of invertebrates are frequently undetected and poorly documented. To address this data deficiency, we have developed a new national database – Butterflies Australia – for one insect taxon that integrates citizen science (data collectors) with global, standardised monitoring protocols and emerging tools in technology and biodiversity informatics. The database is created from a platform, which consists of a phone app and website, that offers the potential to rapidly increase data availability on the occurrence of Australian butterflies at a far greater scale than was previously possible, as well as to monitor trends in their distribution and abundance over time. We discuss the attributes and importance of successful citizen science projects and quantitative methods for monitoring butterflies, both from an Australian perspective and in an international context, and then outline the operational aspects of the Butterflies Australia platform. A review of survey methods that have been used for monitoring or inventorying butterflies in Australia over the past 50 years revealed a diverse array of sampling techniques, with little standardisation between studies and wide variation in space (sampling unit) and time (sampling effort). Transect counts, in particular, have rarely followed the international guidelines recommended for standardised global butterfly monitoring. Finally, we discuss the benefits of our new citizen science tool for butterflies and potentially other invertebrates. We envisage that our platform