“…The types of volunteer monitoring efforts are also diversifying. In addition to weather, bird, and water monitoring, citizens also monitor a multitude of types of environmental systems and organisms, including air (O'Rourke and Macey 2003), amphibians (Shirose et al 1997), biodiversity (Cosquer et al 2012), mammals (Moyer-Horner et al 2012), invasive species (Gallo and Waitt 2011), forestry (Ballard et al 2008), marine environments (Evans et al 2000), and bees (Ashcroft et al 2012). These efforts have produced invaluable data that have been used by scientists to track changes in populations and environmental trends over time (e.g., Ticheler et al 1998, Boylen et al 2004, Bhattacharjee 2005, Greenwood 2007, Dickinson et al 2012) and by managers to modify practices to eliminate pollution (Da Silva Pinho 2000).…”