RT Journal Article SR Electronic T1 Finding the signal in the Noise of Citizen Science Observations JF bioRxiv FD Cold Spring Harbor Laboratory SP 326314 DO 10.1101/326314 A1 Steve Kelling A1 Alison Johnston A1 Daniel Fink A1 Viviana Ruiz-Gutierrez A1 Rick Bonney A1 Aletta Bonn A1 Miguel Fernandez A1 Wesley M. Hochachka A1 Romain Julliard A1 Roland Kraemer A1 Robert Guralnick YR 2018 UL http://biorxiv.org/content/early/2018/05/18/326314.abstract AB While many observations of species are being collected by citizen science projects worldwide, it can be challenging to identify projects collecting data that effectively monitor biodiversity. Over the past several years the allure of taking a “Big Data” approach has provided the opportunity to gather massive quantities of observations via the Internet, too often with insufficient information to describe how the observations were made. Information about species populations — where and when they occur and how many of them are there — (i.e., the signal) can be lost because insufficient information is gathered to account for the inherent biases in data collection (i.e., the noise). Here we suggest that citizen science projects that have succeeded in motivating large numbers of participants, must consider factors that influence the ecological process that affect species populations as well as the observation process that determines how observations are made. Those citizen science projects that collect sufficient contextual information describing the observation process can be used to generate increasingly accurate information about the distribution and abundance of organisms. We illustrate this using eBird as a case study, describing how this citizen science platform is able to collect vital contextual information on the observation process while maintaining a broad global constituency of participants. We highlight how eBird provides information with which to generate biodiversity indicators — specifically distribution, abundance, and habitat associations — across the entire annual cycle, even for populations of long distance migratory birds, a highly challenging taxon.