This blog was written by Kassidy Troxell, Ph.D., a Research Assistant Professor at Florida international University’s Institute of Environment, and collaborator with Ocean Conservancy on our work to promote healthy Florida aquatic ecosystems. Dr. Troxell is a lead scientist executing the nitrogen fingerprinting discussed in this blog.
November was Manatee Awareness Month, a month dedicated to highlighting the popular aquatic mammal and the broader importance of clean, healthy waterways in Florida. One of the greatest challenges to water quality in areas like Tampa Bay is nutrient pollution. Excess nutrients in coastal waters fuel harmful algae which “bloom” into patches, one example is the well-known Karenia brevis referred to as red tide, causing fish kills and human respiratory problems while also reducing the sunlight needed by underwater seagrasses to flourish. These blooms diminish essential seagrass habitats, impacting marine species like manatees, harming local ecosystems and affecting human health. Identifying the primary sources of nutrient pollution is crucial for developing targeted strategies to control nutrient levels and maintain the health of delicate ecosystems.
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In Tampa Bay, my lab at Florida International University has partnered with Ocean Conservancy to do just that: understand and address nitrogen pollution, the nutrient that contributes to water quality impairment, in the Hillsborough Bay and the larger Tampa Bay ecosystem. By using manmade or commonly used chemicals, we can pinpoint the sources of nitrogen—whether from untreated stormwater street runoff, treated home, business or industrial wastewater, or agriculture—allowing for more targeted management efforts. Just as each of us humans have our own unique fingerprints made of various patterns and distinctions, contamination sources have a unique makeup of compounds that allows us to fingerprint and track their movements throughout a watershed.

Key findings from recent study in Tampa Bay
The Hillsborough River, which flows into Hillsborough Bay and is vital to the health of Tampa Bay’s ecosystem, serves as the geographic focus of our study. Our preliminary results reveal that nitrogen levels in these waters rise significantly during the wet season when runoff is at its peak. Chemical tracers, which act like “markers” for pollution sources, suggest that reused non-drinkable treated water (reclaimed water), stormwater and agriculture are contributing sources of nitrogen into the waterway. Within the Hillsborough River watershed, nitrogen levels show distinct patterns (i.e., “fingerprints”) linked to various sources: reclaimed water and agricultural activities are prominent in the upper watershed, while urban stormwater runoff and wastewater inputs are notable near the river’s mouth. Potential contributions from other sources, such as septic systems, are still under investigation.

Now that we have identified the preliminary nitrogen sources and hotspots, the next phase of the project will focus on the sources that are contributing the largest nitrogen loads, the geographic origins of those sources and the amounts of the nitrogen going into the waterways. Future sampling will expand sampling sites in the tributaries that feed into the preliminary hotspot locations along the mainstem (the primary downstream river segment in contrast to its tributaries). This information will help tailor interventions to reduce nitrogen loads at the source and guide management efforts to improve water quality and ecosystem recovery in Tampa Bay.
The future of Florida’s water quality
Our research underscores the need to better manage nutrient levels to protect Florida’s coastal waters. The data generated from our study will give policymakers a more precise geographical understanding of nitrogen hotspots for prioritizing actions to curb nutrient pollution. Indeed, Ben Albritton, the incoming Majority Leader of the Florida state senate, recently said as much when he pointed to the importance of fresh, accurate data needed to drive solutions, whether these are new policies, investments or on-the-ground management practices.

Our activities on land—whether through treated wastewater, stormwater runoff or agricultural practices—have direct impacts on coastal ecosystems. While the Hillsborough River is the focus of this pilot study, we believe the nutrient fingerprinting techniques will be a valuable water quality management tool in other Florida estuaries and bays as well. By pinpointing and quantifying the largest nutrient sources, we can better protect the health of our marine environments and communities alike, which will benefit all Floridians.
Undoubtedly, Florida’s waterways are facing enormous challenges. Ocean Conservancy is dedicated to addressing nitrogen pollution, in part, for marine species like manatees that are so greatly impacted by threated water quality. Take action with Ocean Conservancy to demand greater protections for imperiled manatees and improvements in water quality in Florida and beyond.
The post Fingerprinting the Source of Nitrogen Pollution in Tampa Bay appeared first on Ocean Conservancy.
Fingerprinting the Source of Nitrogen Pollution in Tampa Bay
Ocean Acidification
How are Sharks Affected by Plastic Pollution?
It’s one of the best weeks of the year: Shark Week. As our finned friends get a lot of extra attention this week, I am reflecting on my love of sharks and the threats they’re facing. In fact, before I was an ocean plastics guy, I was a shark guy. And sadly, on a perfect sunny day in the tropics while searching for sharks, I also found plastics.
Two decades ago, I was researching these magnificent animals in the crystal-clear waters of the Turks and Caicos Islands (TCI) at the School for Field Studies. Each day, we’d take our research boats out in hopes of tagging juvenile lemon sharks to better understand their movements, site fidelity and nursing habitats in the shallow waters surrounding South Caicos. Every interaction with these animals was exhilarating, and quite often we’d get the bonus of spotting or tagging other species like bonnethead sharks, Caribbean reef sharks and even the awe-inspiring tiger shark—my personal favorite!
While out on shark patrol one Sunday afternoon along the eastern reef of South Caicos, I first encountered plastic pollution on a magnitude I had never previously seen. Due to the steep cliffs that backed the beach and the shallow reefs that protected it seaward, piles of plastics and debris that drifted over the reef and onto the sand remained stranded. And with little to no human access to these beaches in the early 2000s, the accumulations grew with each passing day.
Sharks are increasingly threatened by plastic pollution, primarily through entanglement and ingestion. At least 34 species have been reported entangled in plastic debris, although actual numbers are likely much higher due to underreporting. The most common item causing entanglement is abandoned, lost or discarded fishing gear (also known as “ghost gear”), though plastic strapping bands also pose a major risk. Looped plastics like strapping bands can constrict sharks, interfering with feeding and breathing.
Sharks are at risk from eating plastics, too. Plastic bags, plastic packets and even a boot have been found inside shark stomachs. And scientists believe microplastics may pose a particular risk to filter-feeding species like whale sharks, although hundreds to thousands of microplastics have been documented inside individual tiger and hammerhead sharks as well. There is still much more to learn and understand about the interactions and effects of plastics on sharks, but what is known raises concerns about the long-term impacts of plastic ingestion on shark health and ocean health more broadly.
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It was on that same reef in South Caicos in 2006, during a break from shark patrol and long before joining Ocean Conservancy where I first participated in the International Coastal Cleanup® (ICC). And like the millions of ICC volunteers around the world who participate each year, I too collected data on every item I picked up. And with each item, I was more and more curious, asking the questions: “Where did these plastics come from? “How the heck did they end up here?” and “This can’t be good for ocean animals, can it?”
I would later learn that the piles of debris that littered that stretch of coast came from all over the Caribbean. This was also my first glimpse of how the brands and languages on plastics provide valuable information to trace where trash comes from, an approach I still use to this day in fieldwork around the world. Further, it showcased the interconnectedness of the waters and people throughout the Caribbean Sea and North Atlantic Ocean.
These early, formative encounters with ocean plastics have stuck with me over the past 20 years, as have the sights of sharks effortlessly navigating their natural environments in those TCI waters. It is something that is forever lodged in my memory, something I never forget or tire of. Sharks have existed in our ocean for more than 400 million years, and over this time, they have perfected every aspect of their design. However, sharks were never meant to contend with the plastic pollution that now overwhelms every dimension of their marine environment.
Today, the most harrowing fact this Shark Week is that the plight of sharks has never been greater. And the scariest thing in the ocean isn’t a shark, it’s plastic pollution. Join Ocean Conservancy for Plastic Free July and beyond and call on your elected leaders to phase out wasteful, harmful single-use plastics.
The post How are Sharks Affected by Plastic Pollution? appeared first on Ocean Conservancy.
Ocean Acidification
Honoring New Orleans 20 Years After Hurricane Katrina Means Protecting NOAA
Nayyir Ransome builds relationships between the government and the people it serves to support the ocean. As Senior Analyst with Ocean Conservancy, Nayyir sees the power of small, incremental steps that lead to big impacts for people and waterways.
“I want to encourage people to start where they are. Start with your friends, your church group, your classroom”, Nayyir shared.
Nayyir started advocacy work when they were young, joining the Campfire Youth Legislature as a seventh-grade student in Broadmoor Middle School in East Baton Rouge Parish School System, a school that was closed in 2019. “I was one of the youngest people in the room. The bill that I proposed didn’t even make it out of committee. So, when it was time to come together on the floor and vote on all the bills that came out of committee, I decided that I was going to speak on every single bill that hit the floor, literally, all of them. I ended up winning Outstanding Legislator that year. This honor is given only to one legislator out of almost 500 young people from across the state. I still have the medal. I keep it on my desk lamp with all my other conference tags and medals. It reminds me how much impact a person simply speaking up can have. Whether or not the vote goes your way at that moment, someone is still listening.”

Nayyir got involved in Youth Legislature at a time in Baton Rouge, Louisiana, when many students were feeling unheard, anxious and facing physical displacement after Hurricane Katrina.
Remembering the day Hurricane Katrina landed
On August 29th, 2005, Hurricane Katrina made landfall in New Orleans. At least 1,900 people were killed in the storm and, due to medical and infrastructure complications, post-storm. The devastation of one of the deadliest hurricane seasons in United States history forced 650,000 survivors from their homes—some were never able to return.
“We were out of school for two weeks. Compared to New Orleans where many schools closed for months and others shut their doors permanently, this felt like a privilege. When we went back to school, there were 200 more students in the building. Many families from New Orleans were forced to move to temporary housing in Baton Rouge. Our school was one of many that saw a large influx of students from New Orleans where many schools were unable to reopen due to Katrina. There wasn’t enough space, services or support to handle that, and it became a tense environment for all of us.”
Nayyir’s family moved to Baton Rouge just one year before the storm. Coming from Philadelphia, one of the largest metropolitan cities in the country, Nayyir experienced an intense culture shock when adjusting to life in open-air, sea-centric Southern Louisiana. Nayyir reflected on the contrast of towering buildings and lightning-fast train transport to kids catching mudbugs from the crawfish mounds in the drainage ditches, designed to channel storm water, along roads without sidewalks.
“When I started participating in Camp Fire USA’s Youth Legislature program, I felt intimidated. It was a strange experience, grappling with my own sense of displacement while watching other kids being displaced on such a large scale due to Hurricane Katrina. I wasn’t from the area, but I was there, and I did understand how it felt to be pushed out, to feel discarded.”
New Orleans has a culture unlike any other place in the world, and this rich weaving of languages, ethnicities and histories creates an unshakable strength that still stands today. Yet, the crippling impacts of Hurricane Katrina can be traced through the yet-to-be-rebuilt homes in the Lower Ninth Ward and the reality of long-term health consequences and economic instability for many residents, even now, 20 years after the storm.
Hurricane detection is better than ever, thanks to NOAA
In 2005, the best hurricane detection science provided around a 48-hour warning. The people of New Orleans had less than 24 hours from the time the mandatory evacuation order was issued to when water began to spill over one of the levees.
When Hurricane Katrina developed into a Category 3 storm, receded and then reformed as a Category 5 storm, scientists, local officials and communities scrambled to keep up and spread information quickly.
“We didn’t know what was happening in New Orleans for three days. People with friends and family there were starting to panic.”
Now, thanks to the steady, decades-long efforts of organizations like the National Oceanic and Atmospheric Administration (NOAA), current predictive technologies can provide up to five days warning of extreme weather—enough time potentially to prevent storms from having the same catastrophic impact as Katrina. Yet, the question remains, ”Will we continue funding the hurricane forecasting systems we know are protecting our communities?”
Tell Congress to Protect NOAA Today
Take action to ensure Congress stands up for NOAA, demanding the agency be fully funded and fully staffed.
Understanding NOAA’s vital role during storm season
It might not be clear what NOAA does during hurricane season because much of their work is behind the scenes. The National Weather Service sits under NOAA, and NOAA scientists and professionals are key players in many of the long-term conservation measures, research and technology that prevent the most dire consequences of extreme weather. Their work includes projects that we may not think of as disaster preparedness and resilience, such as coastal restoration initiatives.
NOAA uses a variety of scientific instruments on crafts such as planes, saildrones and gliders to gather data from inside hurricanes. Long term ocean observations contribute to hurricane and weather models. This hurricane season we have an opportunity to speak up about the proposed cuts to NOAA and the vital resources we would lose if these budget changes are approved by Congress. Continuing to fund NOAA is one way to ensure ongoing improvements to weather forecasting, honor those lost to Hurricane Katrina and, in the aftermath, support the people of New Orleans today, as they rebuild and heal.
We can all speak up for life-saving hurricane detection and research
As storm seasons intensify, we need faster, more accurate weather prediction and storm detection more than ever. NOAA is America’s first line of defense against the deadliest impacts of natural disasters on our communities. Yet, NOAA’s funding is facing major cuts that, if enacted, will result in lives lost. We need to keep moving forward keeping in mind and heart the nearly 2,000 people who lost their lives during Katrina, the thousands more New Orleanians who lost their land and legacies, and the hundreds of thousands of people who are impacted by deadly storms in the United States each year.
Looking back, Nayyir can see how these experiences growing up in post-Katrina Louisiana shaped their advocacy and approach to community organizing.
“My time in Southeast Louisiana taught me a lot about people-centered advocacy. Even if we haven’t experienced something at its most extreme, we can find a way to understand the root of it by looking at our lives and the places we live. Ocean Conservancy has helped me to grow in how and why we must work across government agencies and lines to protect our ocean and the people who rely on it.”
Ocean Conservancy works alongside NOAA as a science-led advocacy organization mobilizing federal, state and local action for our ocean. Every investment in NOAA translates into vital seconds, hours and days of response time for communities when hurricane season strikes. The more data we can collect and use to predict the behavior and patterns of storms, the better we can respond and prevent tragedies.
Each year, storm season is intensifying from climate change—and not just on our coasts. Communities throughout the U.S. are affected by hurricanes and floods that threaten lives and livelihoods. We all rely on NOAA’s vital research and tools for weather prediction and extreme weather warnings. These services are a lifeline we cannot afford to lose.
Call on your Congress members today and insist they support full funding and operation of NOAA.
The post Honoring New Orleans 20 Years After Hurricane Katrina Means Protecting NOAA appeared first on Ocean Conservancy.
Honoring New Orleans 20 Years After Hurricane Katrina Means Protecting NOAA
Ocean Acidification
Introducing Ocean Conservancy’s 2025 Photo Contest Winners
Ocean Conservancy’s annual Photo Contest has come to a close and the results are breathtaking. Hundreds of you sent inspirational and heartbreaking photos and videos, and I am so impressed. Thank you for sharing your art with us. Discover the beautiful, inspiring and heartbreaking submissions that won the hearts of our judges, our staff and ocean lovers like you.
I am thrilled to announce the winners of Ocean Conservancy’s 2025 Photo Contest.
Judge’s Choice Winner
The Art of Survival by Rickie Andrés Ballesteros Guerrero
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From the Photographer:
“A blue-footed booby from the Galapagos Islands breaks the ocean’s surface in a swift and precise flight. With its wings spread and eyes focused, it catches a gleaming fish in its beak. The water splashes around it in a fleeting but powerful scene of the natural balance between predator and prey.”
What our Judges had to say:
“A moment frozen in time – this one stopped me in my tracks. A brief beat in the natural world, captured spectacularly.” – Pier Nirandara, 2025 Ocean Conservancy Photo Contest Judge
“An excellent photo of feeding and fighting for survival. The composition, light and action are perfectly captured. A great job by the photographer who patiently waited for the right moment to shoot. Great work.” – Mariano Rodríguez, 2025 Ocean Conservancy Photo Contest Judge
“This is a standout capture of a decisive moment. The image is sharp, emotional and dynamic. You can feel the energy of the hunt. It’s the kind of photo that brings nature’s raw beauty front and center—and reminds us of the power and grace within every species.” – Angela J. Farmer, 2025 Ocean Conservancy Photo Contest Judge
“A fantastic shot. He shot fast enough to freeze the exact moment. Lighting is good and also post processing. Love it.” – Joaquín Fregoni, 2025 Ocean Conservancy Photo Contest Judge
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Staff Choice Winner
Sunset Whale Tail in Front of Eagle Glacier by Harvey Hergett
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From the Photographer:
“On the last whale watching trip of the summer with Jayleen’s Alaska, as the sun was setting on a perfect September day in Alaska, she positioned the boat perfectly in front of Eagle Glacier to capture this humpback whale who was playfully tail and fin slapping.“
What our staff had to say:
“I recognized this beautiful spot outside of Juneau right away! One of the things I love about Alaska is that there is always magic if you know where and how to look for it. Thank you for sharing this little slice of my home.” – Mike Levine, Senior Director, Alaska Programs
People’s Choice Winner
Manatee Love! by Paige Taggart

From the Photographer:
“This was taken in Crystal River, Florida when a curious juvenile manatee was investigating me while I was snorkeling the springs.”
What our staff had to say:
“Manatees have a special place in every Floridian’s heart, and anybody who’s ever visited the Sunshine State and seen these gentle giants up close and personally can attest to their awesomeness. With their round bodies and curious personalities, they perfectly embody the uniqueness of the Floridian environment and remind us of how important it is to protect our special and beloved ocean and coasts.” – J.P. Brooker, Director, Florida Conservation
We’d like to extend our deepest thanks to all who participated, voted, shared and submitted photos—you truly made this year’s contest a success. And a very special thank you to our judges: Angela J. Farmer, Joaquín Fregoni, Pier Nirandara and Mariano Rodríguez for lending their expert eyes to evaluating our finalists and determining our grand prize winner. Learn more about our judges here.
Congratulations to ALL our entrants, and we hope to see you next year.
The post Introducing Ocean Conservancy’s 2025 Photo Contest Winners appeared first on Ocean Conservancy.
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