Part I Introduction Chapter 1 The Promise and Need of Citizen Science for Coastal and Marine Conservation John A. Cigliano and Heidi L. Ballard Part II: The practice of marine and coastal citizen science for conservation Chapter 2 Defining the Baseline and Tracking Change in Seabird Populations: The Coastal Observation and Seabird Survey Team (COASST) Julia K Parrish, Kate Litle, Jane Dolliver, Todd Hass, Hillary Burgess, Erika Frost Charlie Wright and Timothy Jones Chapter 3 Using citizen science to address conservation issues related to climate change and coastal systems Jenny A Cousins, Mark Huxham, and Debbie Winton Chapter 4 Citizen Sentinels: The role of Citizen Scientists in Reporting and Monitoring Invasive Non-Native Species Jack Sewell and Jon Parr Chapter 5 Using citizen science to study the impact of vessel traffic on marine mammal populations Lei Lani Stelle Chapter 6. Marine Litter – bringing together citizen scientists from around the world Martin Thiel, Sunwook Hong, Jenna Jambeck, Magdalena Gatta, Daniela Honorato, Tim Kiessling, Katrin Knickmeier, and Katrin Kruse Chapter 7 Using Citizen Science to Inform Ocean and Coastal Resource Management Ryan Meyer, Erin Meyer, Leila Sievanen, and Amy Freitag Chapter 8 Engagement in Marine Conservation through Citizen Science: A Community-Based Approach to Eelgrass Restoration in Frenchman Bay, Maine, USA Jane E. Disney, Emma Fox, Anna Farrell, Carrie LeDuc, and Duncan Bailey Chapter 9 Citizen Science and Marine Policy Bryony L Townhill and Kieran Hyder Part III: The People and Perspectives of Marine and Coastal Citizen Science: Diverse Interests, Needs, and Benefits Chapter 10 Collaborating with indigenous citizen scientists towards sustainable coral reef management in a changing world: the One People One Reef Program Nicole L. Crane, John Rulmal, Jr., Peter Nelson, Michelle Paddack and Giacomo Bernardi Chapter 11 Engaging Youth and Schools in Coastal Citizen Science: Balancing Both Education and Science Goals Ann Wasser Chapter 12. Uniquely marine: snorkelers and divers as citizen scientists John A. Cigliano and April D. Ridlon Part IV Conclusions - Lessons Learned and Best Practices for marine and coastal conservation citizen science Chapter 13 Communication and Trust-Building with the Broader Public through Marine and Coastal Citizen Science Edd Hind, Greta T. Pecl and Christine A. Ward-Paige Chapter 14 Conclusions: Lessons Learned and Next Steps for Citizen Science in Marine and Coastal Conservation Heidi L. Ballard and John A. Cigliano