INTRODUCTION TO THE SPECIAL ISSUE • MBON—Marine Biodiversity Observation Network: An Observing System for Life in the Sea
By Francisco P. Chavez, Robert J. Miller, Frank E. Muller-Karger, Katrin Iken, Gabrielle Canonico, Katharine Egan, James Price, and Woody Turner

Pelagic Biodiversity, Ecosystem Function, and Services: An Integrated Observing and Modeling Approach
By Jarrod A. Santora, Isaac D. Schroeder, Steven J. Bograd, Francisco P. Chavez, Megan A. Cimino, Jerome Fiechter, Elliott L. Hazen, Maria T. Kavanaugh, Monique Messié, Rebecca R. Miller, Keith M. Sakuma, William J. Sydeman, Brian K. Wells, and John C. Field

Changes in Diversity and Species Composition Across Multiple Assemblages in the eastern Chukchi Sea During Two Contrasting Years are Consistent with Borealization
By Franz J. Mueter, Katrin Iken, Lee W. Cooper, Jacqueline M. Grebmeier, Kathy J. Kuletz, Russell R. Hopcroft, Seth L. Danielson, R. Eric Collins, and Dan A. Cushing

Reef-Fish Abundance, Biomass, and Biodiversity Inside and Outside No-Take Marine Zones in the Florida Keys National Marine Sanctuary: 1999–2018
By Megan Medina, Cara Estes, Benjamin Best, Christopher D. Stallings, Enrique Montes, Lucas G. McEachron, and Frank E. Muller-Karger

Satellite Remote Sensing and the Marine Biodiversity Observation Network: Current Science and Future Steps
By Maria T. Kavanaugh, Tom Bell, Dylan Catlett, Megan A. Cimino, Scott C. Doney, Willem Klajbor, Monique Messié, Enrique Montes, Frank E. Muller-Karger, Daniel Otis, Jarrod A. Santora, Isaac D. Schroeder, Joaquin Triñanes, and David A. Siegel

Optimizing Large-Scale Biodiversity Sampling Effort: Toward an Unbalanced Survey Design
By Enrique Montes, Jonathan S. Lefcheck, Edlin Guerra-Castro, Eduardo Klein, Maria T. Kavanaugh, Ana Carolina de Azevedo Mazzuco, Gregorio Bigatti, Cesar A.M.M. Cordeiro, Nuno Simoes, Erasmo C. Macaya, Nicolas Moity, Edgardo Londoño-Cruz, Brian Helmuth, Francis Choi, Eulogio H. Soto, Patricia Miloslavich, and Frank E. Muller-Karger

Species Archetype Models of Kelp Forest Communities Reveal Diverse Responses to Environmental Gradients
By Rhiannon L. Rognstad, Andrew Rassweiler, Daniel C. Reed, Li Kui, and Robert J. Miller

Observing Life in the Sea Using Environmental DNA
By Francisco P. Chavez , Markus Min, Kathleen Pitz, Nathan Truelove, Jacoby Baker, Diana LaScala-Grunewald, Marguerite Blum, Kristine Walz, Charles Nye, Anni Djurhuus, Robert J. Miller, Kelly D. Goodwin, Frank E. Muller-Karger, Henry A. Ruhl, and Christopher A. Scholin

A Global Ecological Classification of Coastal Segment Units to Complement Marine Biodiversity Observation Network Assessments
By Roger Sayre, Kevin Butler, Keith Van Graafeiland, Sean Breyer, Dawn Wright, Charlie Frye, Deniz Karagulle, Madeline Martin, Jill Cress, Tom Allen, Rebecca J. Allee, Rost Parsons, Bjorn Nyberg, Mark J. Costello, Peter Harris, and Frank E. Muller-Karger

Data Management and Interactive Visualizations for the Evolving Marine Biodiversity Observation Network
By Abigail Benson, Tylar Murray, Gabrielle Canonico, Enrique Montes, Frank Muller-Karger, Maria T. Kavanaugh, Joaquin Triñanes, and Lynn M. deWitt

Integrating Biodiversity and Environmental Observations in Support of National Marine Sanctuary and Large Marine Ecosystem Assessments
By Henry A. Ruhl, Jennifer A. Brown, Alexandra R. Harper, Elliott L. Hazen, Lynn deWitt, Patrick Daniel, Andrew DeVogelaere, Raphael M. Kudela, John P. Ryan, Alexis D. Fischer, Frank E. Muller-Karger, and Francisco P. Chavez

Implosion in the Challenger Deep: Echo Sounding with the Shock Wave
By Scott Loranger, David Barclay, and Michael Buckingham

Surface Wave Breaking Caused by Internal Solitary Waves: Effects on Radar Backscattering Measured by SAR and Radar Altimeter
By Jorge M. Magalhães, Werner Alpers, Adriana M. Santos-Ferreira, and José C.B. da Silva

QUARTERDECK • Changing Workplace Concepts
By Ellen S. Kappel

FROM THE TOS JEDI COMMITTEE • A Short Glossary of Inclusive Language
By Susanne E. Craig and EeShan Bhatt

RIPPLE MARKS • Coralporosis: Ocean Acidification Leaves Deep-Sea Coral Reefs at Risk of Collapse
By Cheryl Lyn Dybas

DIY OCEANOGRAPHY • A Simple and Inexpensive Method for Manipulating Dissolved Oxygen in the Lab
By Kara J. Gadeken and Kelly M. Dorgan

THE OCEANOGRAPHY CLASSROOM • Diversifying the Ocean Sciences: Thoughts on the Challenge Ahead
By Corey Garza

CAREER PROFILES • OPTIONS AND INSIGHTS: Meredith White
By Meredith White

CAREER PROFILES • OPTIONS AND INSIGHTS: Katherine Segarra
By Katherine Segarra

Francisco P. Chavez, Monterey Bay Aquarium Research Institute 
Robert J. Miller, University of California Santa Barbara
Katrin Iken, University of Alaska Fairbanks
Frank E. Muller-Karger, University of South Florida

Support for this special issue was provided by the Bureau of Ocean Energy Management (BOEM), the National Aeronautics and Space Administration (NASA), and the National Oceanic and Atmospheric Administration (NOAA).