abstract: 'Amateur naturalists have played an important role in the study and conservation of nature since the 17th century. Today, naturalist groups make important contributions to bridge the gap between conservation science and practice around the world. We examined data from 2 regional naturalist programs to understand participant motivations, barriers, and perspectives as well as the actions they take to advance science, stewardship, and community engagement. These programs provide certification-based natural history and conservation science training for adults that is followed by volunteer service in citizen science, education, and stewardship. Studies in California and Virginia include quantitative and qualitative evaluation data collected through pre- and postcourse surveys, interviews, and long-term tracking of volunteer hours. Motivations of participants focused on learning about the local environment and plants and animals, connecting with nature, becoming certified, and spending time with people who have similar interests. Over half the participants surveyed were over 50 years old, two-thirds were women, and a majority reported household incomes of over \$50,000 (60\% in California, 85\% in Virginia), and <20\% of those surveyed in both states described themselves as nonwhite. Thus, these programs need to improve participation by a wider spectrum of the public. We interviewed younger and underrepresented adults to examine barriers to participation in citizen science. The primary barrier was lack of time due to the need to work and focus on career advancement. Survey data revealed that participants'' ecological knowledge, scientific skills, and belief in their ability to address environmental issues increased after training. Documented conservation actions taken by the participants include invasive plant management, habitat restoration, and cleanups of natural areas and streams. Long-term data from Virginia on volunteer hours dedicated to environmental citizen science show an increase from 14\% in 2007 to 32\% in 2014. In general, participants in the naturalist programs we examined increased their content knowledge about ecosystems, had greater confidence in conserving them, and continued to engage as citizen scientists after completing the program.' affiliation: 'Merenlender, AM (Corresponding Author), Univ Calif Berkeley, Dept Environm Sci Policy \& Management, 137 Mulford Hall, Berkeley, CA 94720 USA. Merenlender, Adina M., Univ Calif Berkeley, Dept Environm Sci Policy \& Management, 137 Mulford Hall, Berkeley, CA 94720 USA. Crall, Alycia W.; Prysby, Michelle, Virginia Tech, 460 Stagecoach Rd,Suite E201, Charlottesville, VA 22902 USA. Drill, Sabrina, Los Angeles Ventura Counties, UC Cooperat Extens, 669 Cty Sq Dr, Ventura, CA 93003 USA. Ballard, Heidi, Univ Calif Davis, Sch Educ, One Shields Ave, Davis, CA 95616 USA.' author: Merenlender, Adina M. and Crall, Alycia W. and Drill, Sabrina and Prysby, Michelle and Ballard, Heidi author-email: adinam@berkeley.edu author_list: - family: Merenlender given: Adina M. - family: Crall given: Alycia W. - family: Drill given: Sabrina - family: Prysby given: Michelle - family: Ballard given: Heidi da: '2023-09-28' doi: 10.1111/cobi.12737 eissn: 1523-1739 files: [] issn: 0888-8892 journal: CONSERVATION BIOLOGY keywords: 'diversity; ecological monitoring; natural history; UC California Naturalist; Virginia Master Naturalist; volunteers' keywords-plus: VOLUNTEERS; KNOWLEDGE; ATTITUDES; BEHAVIOR; HISTORY language: English month: DEC number: '6' number-of-cited-references: '34' orcid-numbers: 'Drill, Sabrina/0000-0001-8243-7422 MERENLENDER, Adina/0000-0002-0681-8642' pages: 1255-1265 papis_id: 8b5ac80d828a35c1c272023ecba71400 ref: Merenlender2016evaluatingenvironmen times-cited: '69' title: Evaluating environmental education, citizen science, and stewardship through naturalist programs type: Article unique-id: WOS:000387229900012 usage-count-last-180-days: '3' usage-count-since-2013: '224' volume: '30' web-of-science-categories: Biodiversity Conservation; Ecology; Environmental Sciences year: '2016'