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johnson-robert3.bsky.social
Robert Johnson
@johnson-robert3.bsky.social
220 followers 67 following 12 posts
Marine scientist | Seagrass ecologist 🌱
Assistant Professor | UW-Madison
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Reposted by Robert Johnson
whoi.edu
An ominous milestone that scientists consider a planetary #tippingpoint has been reached.

Ocean #acidification, a result of excess carbon dioxide absorbed in seawater, has surpassed safe levels in many #coralreef ecosystems.

📲Learn more from @grist.org:go.whoi.edu/grist-acidification
October 24, 2025 at 8:59 PM
johnson-robert3.bsky.social
Florida's staghorn and elkhorn corals 🪸 are now functionally extinct following recent marine #heatwaves since 2023

#marineheatwave #heatwave #coral
🦑

www.nature.com/articles/d41...
These iconic corals are nearly extinct due to heatwaves: can they be saved?
Florida’s primary reef-building corals have been declared ‘functionally extinct’ — prompting a shift in conservation strategies.
www.nature.com
October 25, 2025 at 1:03 PM
johnson-robert3.bsky.social
mid-way through summer, and the #sargassum blooms in the Caribbean are already the largest ever recorded

abcnews.go.com/Internationa...
Why scientists are concerned over the record amount of seaweed in the Caribbean
Millions of tons of seaweed currently floating in the tropical Atlantic Ocean could soon make its way toward the U.S., according to researchers following the phenomenon.
abcnews.go.com
July 9, 2025 at 7:34 PM
johnson-robert3.bsky.social
Happy World Sea Turtle Day! (June 16) 🐢🌊
🦑
Pictures of each of the 7 sea turtle species surround the words "World sea turtle day"
June 17, 2025 at 3:07 AM
johnson-robert3.bsky.social
Congrats to Karen, an amazing scientist, mentor, and friend! 🌱🐢
accstr.bsky.social Archie Carr Center for Sea Turtle Research @accstr.bsky.social · Mar 6
Dr. Karen Bjorndal was recently featured in a piece from the UF College of Liberal Arts and Sciences Communications Support.

Let's congratulate Dr. Bjorndal on her retirement, after a more than 50-year career at the University of Florida!

news.clas.ufl.edu/karen-bjornd...
Karen Bjorndal retires after over 50 years at UF
After more than 50 years at UF, Director of the Archie Carr Center for Sea Turtle Research Karen Bjorndal has retired.
news.clas.ufl.edu
March 8, 2025 at 6:07 PM
Reposted by Robert Johnson
secasc.bsky.social
🚨 Opportunity alert! Archbold Biological Station is #hiring a #SpatialEcologist to do #GIS, data management and analysis based in Venus, FL.

Learn more and apply by Feb 21: archbold-station.apscareerportal.com/jobs/2820429...

#ClimateJobs
January 31, 2025 at 3:13 PM
johnson-robert3.bsky.social
monitoring in Key West, FL shows that cruise ships disturb a similar amount of sediment to a hurricane, with negative implications for benthic sea life, such as #coral and #seagrass

www.miamiherald.com/news/local/e...
Cruise ships stir up a hurricane’s worth of sediment, Key West monitoring shows
That sediment can smother corals and sea grass.
www.miamiherald.com
January 6, 2025 at 8:16 PM
Reposted by Robert Johnson
boardshortsben.bsky.social
As we’re nearing the end of 2024, what’s been the most interesting #MarineScience article that you’ve read this year?
December 14, 2024 at 5:19 PM
johnson-robert3.bsky.social
New study suggests sea bird deaths were much worse than previously realized following The Blob #marineheatwave (2014-2016), estimating that more than 4 million common murres alone died as a result(!) 🦤🦑

www.science.org/doi/10.1126/...
Catastrophic and persistent loss of common murres after a marine heatwave
Recent marine heatwaves have had pervasive effects on marine ecosystems, from declines in primary production to die-offs of top predators. Seabird mortalities are often observed in association with he...
www.science.org
December 13, 2024 at 3:18 PM
Reposted by Robert Johnson
secasc.bsky.social
Fellowship Opportunity!

🌊 NOAA has announced 33 #fellowship positions to support their Climate Resilience Regional Challenge projects!

➡️Learn more and apply by Feb 28, 2025: loom.ly/EwSRTg4
December 4, 2024 at 4:56 PM
johnson-robert3.bsky.social
Roughskin dogfish seen for the first time (at 1,054m) in the central Caribbean 🦑

www.discoverwildlife.com/animal-facts...
When scientists lowered a baited camera 1,054 metres into the Caribbean Sea, a shadow appeared out of the darkness
The researchers say it's the first time this deep-sea species has been recorded in the central Caribbean Sea.
www.discoverwildlife.com
December 8, 2024 at 2:54 PM
Reposted by Robert Johnson
boardshortsben.bsky.social
Hey folks! Interested in seagrass and other coastal submerged aquatic planty things? This starter pack is for you!

It’s small for now, so hit me up if you’d like to be added!

go.bsky.app/Jk81YjR
December 4, 2024 at 6:44 AM
johnson-robert3.bsky.social
10 years on, we're still learning from The Blob what #marineheatwaves can do to marine ecosystems 🦑🧪
www.nytimes.com/2024/12/01/c...
What a Marine Heat Wave Reveals About Our Warming Oceans
An extreme heat wave off California’s coast seemed like an anomaly 10 years ago. But as the ocean warms, the catastrophe may be a glimpse of the future.
www.nytimes.com
December 1, 2024 at 3:13 PM
Reposted by Robert Johnson
seagrasswatch.org
New research shows how marine heatwaves have hidden depths: “Marine heatwaves are damaging to critical ecosystems like coral reefs, driving mass bleaching events like the five we have seen on the GBR since 2016.
#climatechange #marineheatwave #coral #coralbleaching
www.aims.gov.au/information-...
New research shows how marine heatwaves have hidden depths: “Marine heatwaves are damaging to critical ecosystems like coral reefs, driving mass bleaching events like the five we have seen on the Great Barrier Reef since 2016. We need to keep building our understanding of them through sustained and targeted monitoring. This can inform management actions,” said Dr Benthuysen.
November 28, 2024 at 2:08 AM
Reposted by Robert Johnson
nsheridan.bsky.social
🌊🐌 The headshield slug Chelidonura hirundinina might be a cryptic species complex! 🧬 These tiny flatworm hunters show hidden genetic diversity and may even gain new traits by acquiring genes from their prey through horizontal gene transfer.🪸
📸 credi: me
#molluscMonday #MarineLife in the Florida Keys
November 25, 2024 at 11:25 PM
Reposted by Robert Johnson
seagrasswatch.org
Abu Dhabi Selected To Host The 16th International Seagrass Biology Workshop In 2026
www.onearabia.me/business/abu...
#abudhabi #seagrass #ISBW16 #2026
Abu Dhabi Selected To Host The 16th International Seagrass Biology Workshop In 2026
Abu Dhabi will host the 16th International Seagrass Biology Workshop in 2026, focusing on seagrass conservation and research.
www.onearabia.me
November 20, 2024 at 10:26 PM
Reposted by Robert Johnson
seagrasswatch.org
Parts of Great Barrier Reef record worst coral loss in 39 years, early AIMS survey results show
www.abc.net.au/news/2024-11...
#greatbarrierreef #australia #climatechange #climatecrisis #coral #coralloss #coralbleaching
'Our worst fears': Scientists warn of damage to Great Barrier Reef
Large sections of the Great Barrier Reef appear to have been smashed by climate change and cyclones this year, with one reef near Lizard Island losing nearly three quarters of its coral cover since th...
www.abc.net.au
November 19, 2024 at 12:14 AM
johnson-robert3.bsky.social
Thought I'd start with photos of some of my favorite marine creatures - lettuce slugs (Elysia crispata)! #MarineLife
Close up photo of the head of a green lettuce slug underwater A green lettuce slug crawling underwater on a rock with algae
November 19, 2024 at 4:44 AM