CMBC Researchers Share Ocean Protection Council Award

Four researchers at Scripps Institution of Oceanography at the University of California San Diego were awarded a collective $1 million in funding to study topics ranging from saltwater bass populations to coastal cliff erosion.
The awards from the Ocean Protection Council (OPC) are part of a larger grant to fund coastal and ocean management research projects in California. OPC was created in 2004 to help protect, conserve, and maintain healthy coastal and ocean ecosystems and the economies they support. The OPC works with diverse interests and provides the leadership needed to meet the accelerating and complex challenges of our time as set forth in the California Ocean Protection Act.

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Knowlton/Jackson Distinguished Speaker: Dr. Rashid Sumaila

January 11, 2019

Title:  Interdisciplinary collaborative ocean economics research with examples from the ‘ocean trenches’.
Dr. Rashid Sumaila is Professor and Director of the Fisheries Economics Research Unit, Institute for the Oceans and Fisheries & School for Policy and Global Studies, University of British Columbia. He specializes in bioeconomics, marine ecosystem valuation and the analysis of global issues such as fisheries subsidies, illegal fishing, climate change and oil spills. Sumaila is widely published, with over 230 articles in peer-reviewed journals, including in Science, Nature and the Journal of Environmental Economics and Management. Sumaila has won a number of awards such as the 2017 Volvo Environment Prize; the 2017 Benchley Oceans Award in Science, the 2016 UBC Killam Research Prize, and the 2013 American Fisheries Society Excellence in Public Outreach Award, the Stanford Leopold Leadership Fellowship and the Pew Marine Fellowship. Sumaila was named a Hokkaido University Ambassador in 2016.

Alumni Speaker: Sheila Reddy, Ph.D. is Associate Director of Strategic Initiatives, Chief Strategy Office, The Nature Conservancy. Sheila is leading an initiative to transform how we measure conservation impact using remote sensing and artificial intelligence. She also supports strategy development by ensuring strategy teams have the science they need, especially sciences newer to conservation such as economics and other behavioral sciences.
Title: New Science and Technology for Conservation Solutions

3:00 – 5:00 P.M.
Robert Paine Scripps Seaside Forum Auditorium
More details here:

Registration is required:



Fighting for the Ocean

How can we use the ocean without using it up? This is the primary question that Ayana Elizabeth Johnson is addressing through her work in the realm of ocean science and policy.

CMBC alumna Ayana Elizabeth Johnson. Photo: Erika Johnson/UC San Diego

Johnson is a woman of many talents: she’s a marine biologist, policy expert, conservation strategist, and graduate of Scripps Institution of Oceanography at UC San Diego (MS ’09, PhD ’11), where she studied marine biology through the Center for Marine Biodiversity and Conservation (CMBC). She’s also the founder and CEO of Ocean Collectiv, a strategy consulting firm for ocean sustainability grounded in social justice.

The impressive alumna and Triton 40 Under 40 recipient returned to campus on Sept. 26 to serve as keynote speaker at the Scripps Student Symposium (S3), an annual research conference organized by Scripps students. Now in its sixth year, the symposium features presentations and poster sessions designed to showcase the breadth of Scripps research to the new class of students.

Groupers on the Comeback in the Caymans

(From Reef Environmental Education Foundation eNews) REEF’s Grouper Moon Project, ongoing since 2001, was recently featured in Scientific American as a model for natural resource science. The project is a powerful collaboration between scientists at REEF, Cayman Islands Department of Environment, Scripps Institution of Oceanography, and Oregon State University, with input from Caymanian fishermen and support by local businesses. The work has connected cutting-edge science with the real-world need for understanding and protecting Nassau Grouper and their spawning aggregations. The full story, “Groupers on the Comeback in the Cayman Islands”, is available on the Scientific American Blog here.

Expedition to Unlock Secrets of Deep Dutch Caribbean

Explorer on the shore of uninhabited Klein Curaçao with R/V Chapman in the distance. Credit: Uncharted Blue

On August 27 a team of scientists and explorers will travel aboard the R/V Chapman to the uninhabited island of Klein Curaçao as part of a series of oceanographic expeditions designed to document the health and biodiversity of shallow and deep reef ecosystems. The expedition will explore the mesophotic zone — the furthest the sun can penetrate the ocean. “These areas are at the cutting edge of coral reef science as they are very poorly studied and are often made up of species of corals, fish and invertebrates that are totally new to science. It is becoming increasingly clear that mesophotic reefs are diverse and serve many critical ecosystem functions yet they are threatened by many of the same stressors as shallow coral reefs including coral bleaching, ocean acidification and sedimentation. It is essential that we better understand how deep mesophotic reefs function so that we can develop strategies to protect them before it is too late,” says Dr. David Kline, a lead scientist on the expedition and Research Biologist at UC San Diego’s Scripps Institution of Oceanography.

This will be the inaugural expedition in a series led by Uncharted Blue, a new organization, founded by CMBC Alumni.  Uncharted Blue connects adventure seekers with world renowned scientists and marine technology to fuel exploration of uncharted ocean destinations.

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Benthic Ecology Class Blogs

As an assignment for this year’s benthic ecology class,  Lisa Levin asked the students to create a science blog.  The topics cover changing coral reefs and their ecosystems services, climate change and the toxic relationship in corals, the loss of Mexico’s mangrove forests, jellyfish as a cuisine,  “marine vomit” and more.

These are now posted on the CMBC Blog: A View from the PIER.
We hope you find these entertaining and educational.


Congratulations to MAS-MBC students

Nineteen Master of Advanced Studies in Marine Biodiversity and Conservation successfully presented their capstone research at a the annual symposium earlier this week.

If you missed any part of the day long event, it has been recorded and is available here:

For a list of this year’s capstones and order of presentation, please visit:

How “Marine Vomit” is Slowly Destroying this New England Fishery

Benthic Ecology blog post by Christina Jayne

It’s easy to see why this sea squirt is called “Marine Vomit” (

Ithaca, NEW YORK – What is slimy, squishy, less than an inch long, and grows by forming a carpet of individuals on the sea floor off New England? It’s an invasive sea squirt — called “Marine Vomit”, of course. And one species in particular has taken over 140 square miles of sea floor on Georges Bank, an important scallop fishery for all of New England.


What in the world is a sea squirt?

Sea squirts, also known as tunicates, are sac-like filter-feeding animals that attach themselves to the sea floor or any hard surface. Tunicates are colonial organisms, growing in clusters that can expand to form large mats, covering the bottom

Tunicates come in all colors (

A group of scientists lead by Katherine Kaplan and Patrick Sullivan at Cornell University’s Department of Natural Resources have recently published two papers which have studied the invasion and spread of “marine vomit”, also known as the carpet sea squirt (Didemnum vexillum) throughout Georges Bank, an area important for supporting the lucrative scallop fishery. What they’ve found so far may dishearten local fishermen whose livelihoods depend on the Georges Bank.

What makes it invasive?

You may have heard the term “invasive” before, but what does that mean for an ecosystem? Scientists use the word invasive to describe a species that is living in an area outside its native range, and in many cases, may be found overgrowing or out-competing the native species. Many invasive species were brought to new regions by humans, both intentionally and  unintentionally. Invasive species have been known to wreak havoc on native ecosystems, and in case of the carpet sea squirt, Kaplan’s team has discovered it has altered animal community structure and created an additional headache for humans by growing on boat hulls and aquaculture equipment.

Where did it come from?

Researchers believe the carpet sea squirt is native to Japanese waters, and most likely came to the Atlantic on boats or on the shells of oysters brought to the Gulf of Maine for aquaculture. This species has been transported to many coastlines and has become a nuisance around the world.

The invading sea squirt was first observed at Georges Bank in 2000, and now covers an estimated 140 square miles of sea floor. Georges Bank is a large elevated portion of the seafloor, spanning an area larger than the state of Massachusetts. For over 400 years, Georges Bank supported one of the most productive fisheries for Atlantic cod and halibut, but as new bottom trawling methods were employed, these fishes were quickly wiped out, along with deep water corals and sponges that created habitat structure for other species. Now, portions of Georges Bank are federally protected and closed to fishing, but fish stocks have not recovered and the only viable fishery is for the Atlantic sea scallop (Placopecten magellanicus). Kaplan, on the hunt for the invaders, wanted to analyze a region that encompassed both closed and open areas on the bank, to understand the effect of bottom fishing on the scallops and the invasive tunicates.

Her team surveyed the target area using a unique image mapping system in which a camera is towed behind a boat and all the images taken are stitched together using computer software to create a visualization of the area. Kaplan hypothesized that bottom-fishing would have a negative impact on the scallops, and that the invaders would have a negative impact on the scallops. She was right in both cases.

With the invasive tunicate covering the bottom, juvenile sea scallops can no longer attach to the sea floor, and those that find a clear patch are often quickly covered by the invader, which smother the scallops and weigh them down, preventing their escape from predators (yes, scallops can swim) and inhibit their feeding. Kaplan’s team also found that areas open to fishing had lower densities of sea scallops.

Kaplan wanted to find if the presence of the carpet sea squirt altered the community structure and abundance of other organisms on the bank. She found the invader’s presence was negatively correlated with the Atlantic scallop, barnacles, sea urchins, and a tube anemone.

However, the invader encouraged an increased abundance of crabs, burrowing worms, and sea stars. Overall, Kaplan found that the presence of the invader sea squirt reduced biodiversity, and concluded the invader may be even worse for the region than bottom fishing, as in areas where the invader coated the sea floor, no other species were found. She found this result across the study area, as fishing protection did not make a difference.

Abundance of the sea squirt (red) and sea scallop (blue), with closed fishing area in grey. (Katherine Kaplan).

Researchers and fishermen alike are concerned for the Atlantic scallop fishery. Dockside values of North Atlantic fisheries are estimated at $800 million, with much of the production coming from the Georges Bank region. Not only does the carpet sea squirt reproduce and grow rapidly, it has no predators and continues to spread in the North Atlantic. New Zealand has had limited success trying to eradicate their own invasive population, and while covering the sea floor with various tarps or other methods may inhibit the invader, it also negatively impacts the native organisms. It seems the best approach is to educate those who might accidentally transport it elsewhere, to prevent its spread to other regions. Researchers like Kaplan and Sullivan will continue to track the presence of invaders, and hopefully international effort will help prevent the spread of other invasive species around the globe.


Kaplan, K.A., D.R. Hart, K. Hopkins, S. Gallager, A. York, R. Taylor, P.J. Sullivan (2018). Invasive tunicate restructures invertebrate community on fishing grounds and a large protected area on Georges Bank. Biological Invasions 20: 87.
Kaplan, K.A., D.R. Hart, K. Hopkins, S. Gallager, A. York, R. Taylor, P.J. Sullivan (2017). Evaluating the interaction of the invasive tunicate Didemnum vexillum with the Atlantic sea scallop Placopecten magellanicus on open and closed fishing grounds of Georges Bank. ICES Journal of Marine Science 74(9).
“Atlantic:  Georges  Bank”
“Geology and the Fishery of Georges Bank” USGS Fact Sheet

“Little bit of that good old global warming”

Not for Crabs

Benthic ecology blog by:  Olivia Soares Pereira

Global warming and climate change: four words that we have been hearing a lot in the past years, and that big round question comes up: is global warming for real? Some believe it is a hoax “created by and for the Chinese to make United States manufacturing non-competitive”. Scientists say this is the warmest year since 1880. But let’s back up a little, what is really Global Warming?

It is a fact that Earth’s climate changed throughout the history, with cycles of glacial periods and warm periods depending on how much solar radiation the Earth gets. And we might think that the warming we are experiencing is just another warm period and it’s a natural process. However, scientists have been able to gather information on a global scale through satellites and other improving technologies that shows that this time the warming rate is much faster and unprecedented over decades to millennia.

And they found out that the greenhouse effect is fastening this process. Some of the energy from the sun is trapped in the atmosphere because of gases that absorbs that energy and re-emit it in all directions – the ones called greenhouse gases. Without these gases the Earth’s surface would be 30°C colder, but with more of them, it gets warmer. Carbon dioxide (CO2) has the highest contribution to the greenhouse effect, and its concentration in the atmosphere has been increasing since the pre-industrial period. All living beings release CO2 when respiring, but the primary source of that increase is fossil fuels usage by humans. Because this specific CO2 is not derived from a natural biological process we call it as anthropogenic. Higher concentrations of CO2 increase the amount of energy trapped in the atmosphere and, therefore, the temperature. This is what is called Global Warming or Climate Change.

I hope you are convinced that the climate is changing and that the increased concentration of anthropogenic greenhouse gases is the cause of it (which means… yes, WE are driving it), so I will keep going and we will dive deeper into it. The oceans are a great sink for the extra heat in the atmosphere. Because of its physical-chemical properties, ocean waters can take up 1,000 times more heat than the atmosphere. Thus, if the atmosphere is getting warmer, the oceans are also getting warmer. But it is not only about temperature, the gases on the ocean and on the atmosphere are in equilibrium, which means that if the concentration of a certain gas increases in the atmosphere, it will also increase in the ocean. Remember CO2? Absorption of increased levels of atmospheric CO2 by the ocean has and continues to change pH levels, making the oceans mores acid, a process we call ocean acidification (OA). Intergovernmental Panel on Climate Change recent scenarios predict that ocean pH will decrease by 0.3 units and temperatures will increase by 2.6-4.8°C by 2100. These have huge implications on marine life.

 But what do crustaceans have to do with this? Increases in temperature and CO2 changes the availability of specific carbonate species that incorporate many marine invertebrates’ exoskeletons. For example, the saturation state of calcium carbonate will decline, i.e., it will be more soluble, and it will be harder for animals to form their shells and skeletons. Studies have shown that OA affects negatively a broad range of marine calcifying organisms, by changing its survival rates, calcification, growth, development and abundance. Crustaceans, however, have varied responses; some show reduced growth, others show no effect, or even enhance growth under OA conditions. OA has the potential to affect both precipitation of calcium carbonate and the availability and uptake of specific ions necessary for carapace formation. But still, little is known about the functional responses of crustaceans to OA. The exoskeleton is critical for protection from predators and from the environment (e.g. desiccation), resistance to mechanical loads both from predators and preys, and support for mobility. Alterations in its properties may significantly affect the fitness of crustaceans.

Climate change and ocean acidification: a simple scheme from fossil fuels to carbonate soluability

Scientists have been trying to assess the extent to which OA and temperature affects functional properties of decapods (roughly defined as crustaceans with ten legs, as crabs, shrimps, and lobsters). A very interesting study with blue king crabs and red king crabs from Alaska hypothesized that under low pH or elevated temperature, the resistance of their carapace would be reduced due to reduced mineral content of carbonate and a protein called chitin, main constituents of crustaceans’ exoskeleton. NOAA and New Jersey researchers exposed for a full year juvenile blue king crabs to three levels of pH, an ambient level two reduced levels. Juveniles red king crabs were exposed for 6 months to an ambient pH level and a reduced level at three levels of temperature (ambient and two warmer conditions). They then measured the hardness, thickness, and chemistry of the carapace and claw of the animals. They also checked daily for mortalities and molts (when crustaceans change their exoskeleton), recording it and removing it.

For both crabs, the hardness of the carapace did not significantly change among treatment groups, but their claws showed lower hardness in lower pH. For the red king crabs, temperature also did not change total hardness, although the thickness of their carapace was negatively affected. Finally, they verified a significant effect of pH on chemistry, with more calcium (Ca) content on lower pH for blue king crabs. For red king crabs, both pH and temperature had a negative effect on magnesium (Mg) content, which contributes to the hardness, and a positive effect on Ca content in the claws. If we put all these results together we get a situation where the crabs are expending more energy to build their claws due the increased amount of Ca content (remember that OA increase calcium carbonate solubility, making it harder to precipitate it) with lower hardness, and a thicker carapace. Those alterations in mechanical and chemical properties of the claw and carapace affects crabs’ fitness.

If you know something about king crabs, you are probably thinking that this could be just a very specific response since king crabs are mainly found in Alaskan waters and this. Blue crabs, though, are distributed across the western Atlantic Ocean, and they were also the target of a study. The authors aimed to examine the effect of increased temperature and CO2 on the carapace thickness and chemistry of juvenile crabs from Chesapeake Bay. They also exposed the crabs to different treatments: temperature representing summer conditions, with a value of CO2 just below the average for the area, and predicted future conditions (warmer with higher CO2). Each treatment was replicated twice, and crabs were sampled after two molts (27-39 days).

They verified a significant effect of temperature on thickness, with thinner, lighter carapaces associated with higher temperature. Those crabs also contained lower Ca content, showing a significant effect of temperature on it. The carapaces of crabs at high CO2 were heavier and contained more Mg, with a greater effect at high temperature. The Mg:Ca ratios were higher at high CO2, which is an indicator of reduced fitness. Again, OA can decline carapace thickness and change its chemistry. Blue crabs, though, are able to cope with changes in ions fractions in seawater, as they can form their new carapace inside the old one in a controlled environment. However, some specific chemical reactions during calcification process still make it harder for crabs to calcify carbonates, meaning there is still a huge energy cost for it.

Although king crabs and blue crabs have different life histories and distributions, both studies agree that OA has effects on carapace formation, and it seems that there are species-specific responses.

Ok, but why should I care? Take a closer look at the pictures again. Do you recognize them? Let me show you a different view then…

Crab dishes from seafood restaurants in San Diego: Crab Cake with blue crab meat from Bluewater Gril (left); king crab from Crab Town (middle); king crab from Truluck’s Seafood (right).

From simple to more complex dishes, king crabs and blue crabs are part of many seafood restaurants menu, and we can easily find them on markets. In 2011, 10,520 tons of red and blue king crab were captured, and the average final product price stays around $10.00/lb. We can then calculate a price for the king crab fishery of more than $210 bi in 2011. According to Alaska Seafood Marketing Institute, in 2016, wholesale prices for red king crab were 25%-35% higher, and this increase, despite a strong U.S. dollar, indicates a strong demand. Considering this increase in demand and prices, we would expect a market value of more than $262 bi in 2016. Most of the Alaskan king crab goes to U.S. and Japanese markets, but we can find them everywhere in the globe.

However, market values are only the economic output of fisheries, and, to get a better grasp of how much money is involved in fisheries we also have to consider the costs of employees, operating and production, maintenance, and transport. For example, NOAA’s report gives us the following costs for the year of 2014: crew share of $31.81 mi, captain share of $14.41, processing labor payment of $8.99 mi, bait expenditures of $1.47 mi, fuel expenditure of $ 3.8 mi, and imports at a value of more than $180 mi.

Blue crabs are also a huge commercial fishery, that has been historically centered on the Chesapeake Bay, and is increasing in other regions. In the U.S., it is of significant culinary and economic importance, particularly in Louisiana, North Carolina, Chesapeake Bay, and New Jersey, even becoming Maryland’s largest fishery. In 2013, its national market value was of $192 mi, and in 2016, 49.6 mi pounds of blue crabs were harvested only from Chesapeake Bay.

Summarizing everything from climate change to crabs’ market… scientific studies help us understanding the whole picture of the possible impact of a changing climate on economically valuable species, which is crucial to determine the future state of the environment. Changes in thickness, hardness and element content of those crabs’ carapace can have huge impacts on their mobility, feeding mode, protection, fitness and, therefore, survival. With a lower survival rate, their stocks will experience a decrease, having a direct effect on the national and world economy. Not even to mention their biological value and the need of management, given the fishing number, that could be a whole another article. And it is not only about crabs, we still have shrimp, lobster, oyster, and clam fisheries on top of that, which will all be also affected by OA. Economic losses of an eventual disappearance of such animals is just a fraction of the real impact in the whole planet ecosystem. So next time you read something like “U.S. leadership is indispensable to countering an anti-growth energy agenda that is detrimental to U.S. economic and energy security interests” on developing clean energy, keep all that in mind.


Alaska Seafood Marketing Institute. (2016). Alaska Crab Market Summary & Outlook.
Coffey, W. D., et al. (2017). Ocean acidification leads to altered micromechanical properties of the mineralized cuticle in juvenile red and blue king crabs. Journal of Experimental Marine Biology and Ecology, 495, 1-12.
FAO report on capture production by species, fishing areas and countries or areas for king crabs and squat-lobsters from 2002 to 2011.
Garber-Tonts, B, and Lee, J. (2016). Stock assessment and fishery evaluation report for the king and tanner crab fisheries of the Gulf of Alaska and Bering Sea/Aleutian Islands area: economic status of the BSAI king and tanner crab fisheries off Alaska. Seattle, WA.
Glandon, H. L., et al. (2018). Counteractive effects of increased temperature and pCO2 on the thickness and chemistry of the carapace of juvenile blue crab, Callinectes sapidus, from the Patuxent River, Chesapeake Bay. Journal of Experimental Marine Biology and Ecology, 498, 39-45.
NOAA Fisheries Service. Red king crab (Paralithodes camtschaticus).


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