Search

Your search keyword '"Lyza Johnston"' showing total 6 results
Start Over Author "Lyza Johnston" Publication Year Range Last 10 years
6 results on '"Lyza Johnston"'

1. Validation of Reef-Scale Thermal Stress Satellite Products for Coral Bleaching Monitoring

Author

Scott F. Heron, Lyza Johnston, Gang Liu, Erick F. Geiger, Jeffrey A. Maynard, Jacqueline L. De La Cour, Steven Johnson, Ryan Okano, David Benavente, Timothy F. R. Burgess, John Iguel, Denise I. Perez, William J. Skirving, Alan E. Strong, Kyle Tirak, and C. Mark Eakin

Subjects
coral reef, coral bleaching, sea surface temperature, SST, satellite, thermal stress, NOAA Coral Reef Watch, Commonwealth of the Northern Mariana Islands, CNMI, coastal and marine management, coral diversity, Science
Abstract

Satellite monitoring of thermal stress on coral reefs has become an essential component of reef management practice around the world. A recent development by the U.S. National Oceanic and Atmospheric Administration’s Coral Reef Watch (NOAA CRW) program provides daily global monitoring at 5 km resolution—at or near the scale of most coral reefs. In this paper, we introduce two new monitoring products in the CRW Decision Support System for coral reef management: Regional Virtual Stations, a regional synthesis of thermal stress conditions, and Seven-day Sea Surface Temperature (SST) Trend, describing recent changes in temperature at each location. We describe how these products provided information in support of management activities prior to, during and after the 2014 thermal stress event in the Commonwealth of the Northern Mariana Islands (CNMI). Using in situ survey data from this event, we undertake the first quantitative comparison between 5 km satellite monitoring products and coral bleaching observations. Analysis of coral community characteristics, historical temperature conditions and thermal stress revealed a strong influence of coral biodiversity in the patterns of observed bleaching. This resulted in a model based on thermal stress and generic richness that explained 97% of the variance in observed bleaching. These findings illustrate the importance of using local benthic characteristics to interpret the level of impact from thermal stress exposure. In an era of continuing climate change, accurate monitoring of thermal stress and prediction of coral bleaching are essential for stakeholders to direct resources to the most effective management actions to conserve coral reefs.

Published
2016
Full Text
View/download PDF

2. The 2014-17 Global Coral Bleaching Event: The Most Severe and Widespread Coral Reef Destruction

Author

C. Mark Eakin, Denise Devotta, Scott Heron, Sean Connolly, Gang Liu, Erick Geiger, Jacqueline De La Cour, Andrea Gomez, William Skirving, Andrew Baird, Neal Cantin, Courtney Couch, Simon Donner, James Gilmour, Manuel Gonzalez-Rivero, Mishal Gudka, Hugo Harrison, Gregor Hodgson, Ove Hoegh-Guldberg, Andrew Hoey, Mia Hoogenboom, Terry Hughes, Meaghan Johnson, James Kerry, Jennifer Mihaly, Aarón Muñiz-Castillo, David Obura, Morgan Pratchett, Andrea Rivera-Sosa, Claire Ross, Jennifer Stein, Angus Thompson, Gergely Torda, T. Shay Viehman, Cory Walter, Shaun Wilson, Benjamin Marsh, Blake Spady, Noel Dyer, Thomas Adam, Mahsa Alidoostsalimi, Parisa Alidoostsalimi, Lorenzo Alvarez-Filip, Mariana Álvarez-Noriega, Keisha Bahr, Peter Barnes, José Barraza Sandoval, Julia Baum, Andrew Bauman, Maria Beger, Kathryn Berry, Pia Bessell-Browne, Lionel Bigot, Victor Bonito, Ole Brodnicke, David Burdick, Deron Burkepile, April Burt, John Burt, Ian Butler, Jamie Caldwell, Yannick Chancerelle, Chaolun Allen Chen, Kah-Leng Cherh, Michael Childress, Darren Coken, Georgia Coward, M. James Crabbe, Thomas Dallison, Steve Dalton, Thomas DeCarlo, Crawford Drury, Ian Drysdale, Clinton Edwards, Linda Eggertsen, Eylem Elma, Rosmin Ennis, Richard Evans, Gal Eyal, Douglas Fenner, Baruch Figueroa-Zavala, Jay Fisch, Michael Fox, Elena Gadoutsis, Antoine Gilbert, Andrew Halford, Tom Heintz, James Hewlett, Jean-Paul A. Hobbs, Whitney Hoot, Peter Houk, Lyza Johnston, Michelle Johnston, Hajime Kayanne, Emma Kennedy, Ruy Kikuchi, Ulrike Kloiber, Haruko Koike, Lindsey Kramer, Chao-Yang Kuo, Judy Lang, Abigail Leadbeater, Zelinda Leão, Jen Lee, Cynthia Lewis, Diego Lirman, Guilherme Longo, Chancey MacDonald, Sangeeta Mangubhai, Isabel da Silva, Christophe Mason-Parker, Vanessa McDonough, Melanie McField, Thayná Mello, Celine Miternique - Agathe, Stephan Moldzio, Alison Monroe, Monica Montefalcone, Kevin Moses, Pargol Ghavam Mostafavi, Rodrigo Moura, Chathurika Munasinghe, Takashi Nakamura, Jean-Benoit Nicet, Marissa Nuttall, Marilia Oliveira, Hazel Oxenford, John Pandolfi, Vardhan Patankar, Denise Perez, Nishan Perera, Derta Prabuning, William Precht, K. Diraviya Raj, James Reimer, Laura Richardson, Randi Rotjan, Nicole Ryan, Rod Salm, Stuart Sandin, Stephanie Schopmeyer, Mohammad Shokri, Jennifer Smith, Kylie Smith, S. R. Smith, Tyler Smith, Brigitte Sommer, Melina Soto, Helen Sykes, Kelley Tagarino, Marianne Teoh, Minh Thai, Tai Toh, Alex Tredinnick, Alex Tso, Harriet Tyley, Ali Ussi, Christian Vaterlaus, Mark Vermeij, Si Tuan Vo, Christian Voolstra, Hin Boo Wee, Bradley Weiler, Saleh Yahya, Thamasak Yeemin, Maren Ziegler, Tadashi Kimura, and Derek Manzello

Abstract

Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local effects of these events have been widely reported, the global implications remain unknown. Analysis of 15,066 reef surveys during 2014-2017 revealed that 80% of surveyed reefs experienced significant coral bleaching and 35% experienced significant coral mortality. The global extent of significant coral bleaching and mortality was assessed by extrapolating results from reef surveys using comprehensive remote-sensing data of regional heat stress. This model predicted that 51% of the world’s coral reefs suffered significant bleaching and 15% significant mortality, surpassing damage from any prior global bleaching event. These observations demonstrate that global warming’s widespread damage to coral reefs is accelerating and underscores the threat anthropogenic climate change poses for the irreversible transformation of these essential ecosystems.

Published
2022
Full Text
View/download PDF

3. Primary Production and Calcification Rates of Algae-Dominated Reef Flat and Seagrass Communities

Author

Lyza Johnston, D. I. Perez, Stuart R. Phinn, Emily C. Shaw, John Iguel, and Chris Roelfsema

Subjects
0106 biological sciences, Atmospheric Science, 010504 meteorology & atmospheric sciences, Soil Science, Aquatic Science, 01 natural sciences, Algae, Reef, 0105 earth and related environmental sciences, Water Science and Technology, geography, geography.geographical_feature_category, Ecology, biology, 010604 marine biology & hydrobiology, fungi, technology, industry, and agriculture, Paleontology, Primary production, Forestry, Coral reef, biochemical phenomena, metabolism, and nutrition, biology.organism_classification, Oceanography, Seagrass, Habitat, Productivity (ecology), population characteristics, Bay, geographic locations
Abstract

Monitoring variability in coral reef primary production and calcification is needed to understand changes over time and between reef systems, which helps separate differences due to natural and/or anthropogenic factors happening now and in the future. This study measured net productivity and calcification for two reef systems at Shark Bay, Heron Reef in the southern Great Barrier Reef and Saipan Lagoon, Commonwealth of the Northern Mariana Islands. Net primary productivity and calcification were strongly correlated for reef flats with an adjusted R = 0.66. Night time dissolution occurred at Shark Bay reef flat with an average of −12.66 mmol CaCO · m · hr, while calcification increased at night for the Saipan reef flat. For both reef flat sites, net productivity from oxygen flux was much lower than rates calculated from change in dissolved inorganic carbon. This study provided the first baseline estimates of net productivity and calcification for a reef flat and seagrass community in Saipan Lagoon. The seagrass community had the lowest productivity of all sites. However, the high presence of calcareous algae at the site highlights the need for more research on the carbonate chemistry of these habitats. All sites had high net productivity that was most likely associated with the dominant presence of algae.

Published
2018
Full Text
View/download PDF

5. Shift from coral to macroalgae dominance on a volcanically acidified reef

Author

Renée Carlton, Steven Johnson, Michael D. Fox, Lauren Valentino, Charles W. Young, Graham Kolodziej, Tim Burton, Yoan Eynaud, Simon J. Clark, Nichole N. Price, Emily M. Donham, Derek P. Manzello, Lyza Johnston, Ryan Okano, David Benavente, John Iguel, Clinton B. Edwards, and Ian C. Enochs

Subjects
geography, geography.geographical_feature_category, biology, Resilience of coral reefs, Ecology, Coral, Ocean acidification, Environmental Science (miscellaneous), biology.organism_classification, Oceanography, Benthos, Algae, Dominance (ecology), Environmental issues with coral reefs, Reef, Social Sciences (miscellaneous)
Abstract

A shift from coral to macroalgae dominance of reef systems affected by volcanically acidified waters around Maug (Mariana Islands, North Pacific Ocean) increases fears that reef corals will be displaced by algae as a result of ocean acidification.

Published
2015
Full Text
View/download PDF

6. Status and Trends of Coral Reefs of the Pacific

Author

Alice Lawrence, Alice Lawrence, Alison Green, Andy Wright, Antoine Gilbert, Aurélie Thomassin, Bruce Carlson, Charles Birkeland, Charlotte Moritz, David Benavente, David Burdick, Douglas Fenner, Emma Kabua-tibon, Flora Artzner, Helen Sykes, Hilary Ayrton, Jason Vii, Jennifer Smith, Jerker Tamelander, Jessica Deblieck, Johanna Johnson, Kelly Kozar, Laurent Wantiez, Lindsey Kramer, Lyza Johnston, Mareike Sudek, Marine Gouezo, Mary Donovan, Maya Srinivasan, Michel Kulbicki, Nicolas Guillemot, Paul Anderson, Peter Houk, Randi Rotjan, Sandrine Job, Sangeeta Mangubhai, Serge Planes, Sheila Mckenna, Stuart Sandin, Tom Heintz, Warren Lee Long, Yoan Eynaud, Alice Lawrence, Alice Lawrence, Alison Green, Andy Wright, Antoine Gilbert, Aurélie Thomassin, Bruce Carlson, Charles Birkeland, Charlotte Moritz, David Benavente, David Burdick, Douglas Fenner, Emma Kabua-tibon, Flora Artzner, Helen Sykes, Hilary Ayrton, Jason Vii, Jennifer Smith, Jerker Tamelander, Jessica Deblieck, Johanna Johnson, Kelly Kozar, Laurent Wantiez, Lindsey Kramer, Lyza Johnston, Mareike Sudek, Marine Gouezo, Mary Donovan, Maya Srinivasan, Michel Kulbicki, Nicolas Guillemot, Paul Anderson, Peter Houk, Randi Rotjan, Sandrine Job, Sangeeta Mangubhai, Serge Planes, Sheila Mckenna, Stuart Sandin, Tom Heintz, Warren Lee Long, and Yoan Eynaud

Abstract

This document is part of the status report series of the Global Coral Reef Monitoring Network (GCRMN) founded in 1995 as part of the International Coral Reef Initiative (ICRI) to document the ecological conditions of coral reefs, to strengthen monitoring efforts, and to link existing organisations and people working with coral reefs around the world.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results