This post is the last blog of the GAME 2025 project. Unfortunately, it was delayed by several months (the project ended in December 2025), but it was not forgotten. Read now about the extraordinary and dramatic experiences that Andrea and Sarah made in Cabo Verde in 2025.

In April 2025, GAME returned once again to the islands of Cabo Verde, this time with Andrea (Technical University of the Atlantic, Cabo Verde) and Sarah (University of Potsdam, Germany). As in previous years, we were exploring the influence of artificial light at night (ALAN) on coastal organisms. The project in 2025 was supposed to bring more knowledge about its influence on the growth of marine epiphytes.

Cabo Verde comprises 10 main islands and a few islets, which are lined up in an arc in the Northern Atlantic. The archipelago was formed by underwater volcanoes that started to emerge from the depths of the ocean about 20 million years ago. The islands are characterized by a dry landscape that has arid and poorly permeable soils, which are almost infertile, and by rainfalls that do not appear every year. Hence, the inhabitants of the archipelago always found their greatest wealth in the sea. As the westernmost African country, its isolation has led to the evolution of marine species that are unique to the islands, while other species that arrived from elsewhere found favourable conditions here. As a relatively young nation, Cabo Verde has yet to explore much of its biodiversity, as well as the marine ecosystems in its waters. Partnerships between Cabo Verde and Germany, which result in projects such as the one we are participating in in the framework of GAME, are always celebrated as they contribute to the scientific enrichment of the country.

Our project was conducted in collaboration with the OSCM (Ocean Science Center Mindelo). The center is, on the one hand, linked to GEOMAR (GEOMAR Helmholtz Centre for Ocean Research Kiel) in Germany and, on the other hand, to IMar (Instituto do Mar) in Cabo Verde. It is dedicated to oceanographic observations and research, and also acts as a connection point for common research activities and the exchange between international scientific institutions. Laboratory work can, for instance, be carried out by using the center facilities and the available equipment. Our experiment, however, was conducted in the field, because of the need for a constant supply with seaweed spores that mediated the colonization of the substrates we provided by epiphytes.

To meet the specific requirements of our study, Porto Grande Bay, more specifically the Mindelo Marina, was chosen as the study site. As its name suggests, this bay is one of the largest in Cabo Verde, and it is located in the northwest of the island of São Vicente. Its calm and shallow waters made it the ideal site for the study we were planning. Except for the intense sun and very strong wind that we felt during the first months of our field work, the place was one of the most interesting and dynamic ones in Mindelo. We spent our days on pontoon B, in front of the Marina Bistro bar, working from morning to night.

In the mornings, we could smell the aroma of stewed “catchupa” and of the seafood that was served there. In the afternoons, the atmosphere was enlivened by the most famous pop songs played at the Ponte d’Água Hotel. Whenever a familiar song came on, we couldn’t resist singing along: “Kiss me hard before you go, Summertime sadness…” At dawn, everything then became calmer. The water was still, and under the lights of the pier, fish swam in circles and created a silent spectacle. Furthermore, in the months before the nesting season in Cabo Verde, it was common to see sea turtles coming to the surface to breathe. Unfortunately, they were so fast that it was almost impossible to get a photo. So fast that Sarah rarely managed to see them. If it were a game, the score would be: Cabo Verde 7 x 1 Germany.

During our work, we met people, both local and from other countries, who were friendly and willing to help, whether with a screwdriver, a tape measure, or a kayak. They were teaching us how to tie a knot, they took photos and videos of us, were giving us ideas and suggestions, or simply provided us company. However, there were also plenty of curious onlookers, mainly elderly tourists who came from the bar-bistro over to the pier, and were interested in what we were doing.

We started our work with one of the biggest challenges of the project: finding a macroalga that could be suitable for the experiment. This alga would needed to have a leathery texture, a flat and broad surface, and should inhabit the subtidal. This was no easy task for us, because although Cabo Verde has a rich marine biodiversity, the biomass of macroalgal species is limited by the nutrient deficiency in the oligotrophic waters of the archipelago. Hence, macroalgae can only be found in small quantities. Furthermore, as it is a tropical country, this task was further complicated by the fact that the waters are warm and shallow, and such conditions mainly favour encrusting and filamentous macroalgae. We began our endeavor by searching online for inventory lists of marine macroalgae on the island of São Vicente, but this was without success. We then invested in more practical approaches, such as diving and snorkeling. We went to the Laginha Coral Cove accompanied by Professor Guilherme, who is a marine biology enthusiast. There, we found two species of macroalgae, both potentially invasive and possibly belonging to the genus Grateloupia, which were qualified to serve as “living substrates” in our experiment.

We collected several specimens of the two species to hang them into the harbour in Mindelo for a pilot study. This was to test if epiphytes would settle on the macroalgae and whether the macroalgae themselves would survive the conditions in the harbour.

Both species made it into the final round. One of them had the perfect shape, but it was far too rare for our needs, while the other candidate was much more abundant. So, we focused on the second one. A further problem we faced was that the macroalgae we worked with had not been scientifically described for Cabo Verde. This meant that there was no literature that we could have consulted to learn about morphological or physiological traits. Furthermore, we had no idea how the algae would performed at different water depths or during low tide when exposed to air.

After some weeks, however, it became clear that our chosen species were rather trapping sediment on their surface than hosting a healthy community of epiphytes. Actually, even under the microscope, sediment and epiphytes were almost impossible to separate. Our supervisor, Corrine Almeida, suspected that the algae’s branched structure made it a natural sediment trap and this was not ideal for our purposes.

Given the high sediment load and the generally murky water in the harbour, we realized that we needed a new plan. We revisited the idea of using our first, more promising species, but after extensive searching, we had to admit that there simply were not enough specimens.

Due to this problem, we were unable to continue with the experiment, but the GAME programme coordinator, Mark, came up with a suggestion. The idea was to replace the living substrate with an artificial material that could, at least partly, simulate the traits of macroalgae, such as a flexible structure. Initially, we thought of using PVC tarpaulin, but this material has high chemical concentrations, which could affect the attachment of epiphytes. We continued searching in Mindelo until we finally found a silicone cooking mat in a Chinese store. The material was thin and malleable, requiring only to be soaked in drinking water for a few days to make its surface rougher. We bought eight green ones, which, after soaking, were cut into pieces that had the same size as the PVC plates.

For building the set up, we unpacked some materials that were left behind at OSCM by previous GAME teams, tested the LEDs, and cleaned the frames. One frame needed patching, while we built another one from the scratch. Mindelo does not have a giant all-in-one hardware store like the ones you can find in Germany – instead, you need to visit several smaller shops, while explaining every time at the counter what excatly you need. If they do not have it, they’ll usually send you to another store that might have it. After a few visits, the shopkeepers start to recognize you and let you rummage around in their storage rooms to find suitable alternatives.

We brought PVC panels from Germany and hand-cut them into 5 × 12 cm pieces. For the frames, we glued PVC pipes together and used thin ropes to create the inner structure. The panels were then attached to the ropes with cable ties, while the fake algae were sewed onto them with needle and thread.

We then installed the lighting system with the help of Eder, who is a technician at OSCM. All electronics were kept in waterproof dry boxes, and we built wooden arms with metal brackets to hold them in their place on the pontoon. We aimed to create similar light fields for both of our frames: Andrea’s with an intensity of 10–20 lux, while Sarah’s had 20–30 lux. After some trial and error, we managed to tune the LEDs perfectly.

However, the real challenge in June was not the construction – it was the wind. With daily gusts of 25–40 km/h, anything lightweight was instantly blown away and we are proud to say that we only lost one measuring tape to the sea. Along the way, we pulled plenty of harbour trash from the water, but also some unusual finds – like a fully inflated unicorn float. We even managed to recover the lid of our dry box from the seafloor, along with a couple of our caps. Hats, in fact, did not stand a chance in the winds of June and keeping them on our heads required constant hand support, so we eventually gave up.

By early July, just in time for our first experiment, the weather turned calmer. This made deploying the frames with our kayak much easier. Earlier, any pause in paddling would have sent us drifting straight back to the pontoon. The kayak also came in handy for measuring the water depth at the experimental site and for adjusting our mooring lines.

In this moment, we were optimistic: The project was starting to get on track. It seemed that we could finally switch on the autopilot and continue the work as outlined in the GAME 2025 manual. However, first we had to test the different steps of the analytical processes in the laboratory. We collected some of the fake algae that we had placed on the frames as backups in case of losses, put them in freezer bags and packed the freezer bags in larger black bags that we filled with ice and transported them to the laboratory. The first step, i.e. scraping the epiphytes from the substrates, went well, but a problem emerged when we tried to perform vacuum filtration. For this, the suspension of seawater, epiphytes, and sediment was poured into the funnel of the filtration unit, and the device was turned on. After a considerable amount of time, we could see that the volume in the funnel had not changed, because the sediment had clogged the flow of water through the filter. We were once again faced with a new impasse, and this one required a solution within a week. This was because the first experiment had already been running for more than seven days and could only continue for one more week. We tried decanting, but the epiphytes and sediment settled at a similar rate at the bottom of the beaker, making it difficult to separate them. Then we tried sieving through different sized meshes, but in doing so we lost a lot of biomass, what would have compromised our results. We also tried a method involving aliquots, which could have worked, but it took too long to test it a second time.

With no time left, we decided to remove the filtration step and to leave the sediment in our samples, as we simply could not get rid of it. Hence, the freezer bags were already drained at the study site. In the laboratory, the epiphytes were scraped off and directly transferred to test tubes, which were then filled up with ethanol. This method proved to be successful as we obtained chlorophyll a concentrations that were similar to those of the other GAME teams. For the biomass samples, a similar method was used, but their processing required the use of a muffle oven to obtain the ash-free dry weight. As none of the institutions here in Mindelo have such equipment, the samples were transported to Germany to muffle them at GEOMAR.

At this point, we were already thinking about what aspects could be improved in our second experiment, which was already underway. Furthermore, Sarah recently completed her first dive, spotting a nurse shark, plenty of fish, and sea turtles. She was hoping to spend more evenings at the beach in the coming weeks, playing volleyball and enjoying live music, especially during the Baía das Gatas Festival—one of the largest festivals in the country—which was approaching. In the words of our advisor, “The project is now running smoothly.” However, no one expected that in August a country that rarely receives rain throughout the year would be shaken by the biggest storm in living memory.

In the early hours of August 11th, storm Erin arrived without warning, causing material losses and, sadly, claiming the lives of nine people on the island of São Vicente. During the night, the scene was one of horror, with streets turned into rivers, lightning illuminating the entire city, and people desperately fighting for their lives and those of their loved ones as rainwater flooded their homes. In the morning, it was then possible to get a real sense of what had happened. Buildings had been knocked down, cars carried out to sea, shops destroyed, all caused by the force of the rainwater. The Mindelo micro-watershed, characterized by a mountainous terrain and a rugged topography, allowed the rainwater that fell on the city to flush to Porto Grande Bay, resulting in an exacerbated discharge of muddy water accompanied by trash. Experiment 2, which had already been in the water for a week, was canceled as the conditions in the bay no longer met the requirements for conducting an experiment. Square kilometers of water that had been crystal clear had turned brown and opaque, and we had no idea how long these conditions would last.

Soon after the storm, it was decided that the team would split up: Sarah would go to Finland to continue her project with the GAME team there, and Andrea would stay here to continue as soon as conditions had improved. A month passed, and the bay was slowly returning to its normal colour, but then another rain came and turned it brown again. Then it was too late to repeat experiment 2. But all is not lost. In January 2026, after we had completed the last phase of the project at GEOMAR in Kiel, Andrea considered to continue with the experimental work. At this time, the rainy season in Cabo Verde was over, and the water was still at mild temperatures.

The unforgettable catastrophe of August 11^th 2025 in São Vicente allowed us to speculate on the origin of the mud/sediment that affected our experiment. The sediment that accumulated on the substrates probably came from the muddy water that floods Porto Grande Bay every year during the rainy season. Somehow—possibly due to the regular entry and exit of ferries from the port—the sediment gets resuspended frequently and travels through the water column by the forces of tidal currents and others. At least one riddle was solved.

GAME 2025: The dramatic end of the project in Cabo Verde

Have you ever seen a sleek, brown-and-white bird hover above the ocean, fold its wings and drop into the water like a cannonball, only to surface seconds later with a fish in its grip? If so, you have probably seen an osprey.

A water-loving bird of prey

Ospreys are birds of prey, also known as raptors. Birds of prey are carnivorous predators that actively hunt and feed on other animals. However, unlike most birds of prey, the osprey’s diet consists of approximately 99% live fish, including catfish, trout and mackerel. Because of their feeding habits, ospreys, also called sea hawks, have unique traits that make them elite hunters of the sea.

Structure and hunting

When ospreys spot a fish, they dive from nearly 100 feet in the air. During the dive, they close their nostrils, called nares, to prevent water from entering.

Ospreys are the only birds of prey that can dive feet-first into water, allowing them to form a streamlined shape that helps them pierce the surface and protect their heads. Their dense, oily feathers act like a wetsuit, keeping them water-resistant during dives.

Once they make contact with prey, they use their reversible outer toes and barbed foot pads, called spicules, to grip the slippery scales of the fish.

After securing their catch, ospreys use their nearly six-foot wingspan to generate the lift needed to carry fish that can weigh nearly as much as they do out of the water.

Finally, once airborne, the osprey rotates the fish to point headfirst, an aerodynamic adjustment that reduces wind resistance on the flight back to the nest.

This specialized anatomy allows ospreys to catch a fish in approximately one out of every four dives.

Habitat and breeding

Because of their dependence on fish, ospreys always live within sight of water. They typically build their nests atop dead trees or man-made structures along harbors and bays, such as channel markers, duck blinds and utility poles.

Both parents help construct the nest. These large structures, sometimes exceeding 300 pounds, are built with sticks and lined with materials like moss and seaweed.

Ospreys breed across every continent except Antarctica, inhabiting ocean coastlines, saltwater marshes, lagoons, estuaries, river mouths and even coral reefs.

Osprey pairs incubate an average of three eggs for roughly one month before they hatch. Chicks then remain in the nest for about 55 days before fledging, the stage in a bird’s life when it develops its feathers and wings enough to leave the nest and fly for the first time.

Why are ospreys important for our ocean?

Ospreys serve as living indicators of ocean health. Because they sit at the top of the marine food chain, they are highly sensitive to pollution and changes in fish populations. A decline in osprey nesting success can signal pollution, overfishing or habitat degradation.

That is why at Ocean Conservancy, we are working to address the ocean’s biggest threats, from plastic pollution to the climate crisis. But we cannot do this work alone. We need advocates like you to protect ospreys and all marine wildlife. Please take action and help us defend our ocean today.

The post Osprey: The Ocean’s Most Specialized Bird of Prey appeared first on Ocean Conservancy.

Osprey: The Ocean’s Most Specialized Bird of Prey

Für mich ist es meine erste Seereise, das erste Mal länger als nur einen Tag auf dem Meer. Und ja, die Labradorsee ist vielleicht nicht unbedingt der einfachste Ort für den Einstieg. Wie viele andere wurde ich in der ersten Nacht ordentlich seekrank. Die starken Bewegungen der Maria S. Merian bei diesen rauen Bedingungen waren anfangs wirklich herausfordernd. Doch nach ein paar anstrengenden Stunden, viel Schlaf und einigen wetterbedingten Arbeitspausen gewöhnte man sich langsam an das ständige Schaukeln und der Bord Alltag konnte beginnen.

Wie beschreibt man das Leben auf einem Forschungsschiff für jemanden, der das noch nie erlebt hat?

Grundlegendes zuerst – das tägliche Leben an Bord:

Essen:
Für Verpflegung ist bestens gesorgt: Frühstück gibt es um 7:30 Uhr, Mittagessen um 11:30 Uhr und Abendessen bereits um 17:30 Uhr. Zusätzlich steht rund um die Uhr ein kleiner Kühlschrank mit Snacks bereit, niemand muss hier hungrig bleiben.

Schlaf:
Guter Schlaf ist zwar nicht immer garantiert, aber man lernt schnell, sich anzupassen. Die meisten Wissenschaftler schlafen in Zweierkabinen mit eigener Nasszelle. Wer Nachtschicht hat, lebt ohnehin in einem anderen Rhythmus. Ein hilfreicher Tipp von einem erfahrenen Seebären: Einfach eine Decke unter eine Seite der Matratze legen, um eine kleine Kuhle zu formen so rollt man nicht ständig hin und her. Mein persönlicher Trick: auf dem Bauch schlafen und sich mit Ellbogen und Knien stabilisieren. So kann man selbst bei starkem Seegang und 11 Windstärken erstaunlich gut schlafen, fast „wie in Mamas Arm“, wie Sascha sagen würde.

Freizeit an Bord:
Allein ist man hier selten, und das ist auch gut so. In den Laboren ist eigentlich immer etwas los, besonders im CTD-Labor, das schnell zum sozialen Mittelpunkt wird. Unser Fahrtleiter Fehmi hat sich vorgenommen, einen neuen CTD-Rekord aufzustellen, was uns viel Zeit dort verbringen lässt, zur Freude der einen und zur Herausforderung für unsere Chemiker.

Abends trifft man sich häufig im Hangar oder in der Messe, um gemeinsam den Tag mit einem Feierabendgetränk ausklingen zu lassen. Ein Highlight ist unser „Echtzeit-Werwolf“-Spiel: Vor ein paar Tagen wurden die Rollen verteilt, und seitdem wird jede Nacht jemand „eliminiert“. Tagsüber wird dann gemeinsam diskutiert und abgestimmt. Aktuell schlagen sich die „Schiffbewohner“ ziemlich gut – nach drei Tagen sind bereits drei Werwölfe enttarnt. Wir bleiben gespannt für wen es heute der letzte Sonnenaufgang war.

Sport und Ausgleich:
Wer sich bewegen möchte, kann den kleinen Sportraum Richtung Bug nutzen, ausgestattet mit Gewichten, Fahrrad, Rudergerät und sogar einem Laufband (auch wenn das bei Seegang durchaus Mut erfordert). Alle drei Tage gibt es außerdem ein Zirkeltraining unter Anleitung von Sven, unserem Chief Engineer. Danach lädt die Sauna zur wohlverdienten Entspannung ein.

Arbeiten auf dem Schiff:
Auch wenn man es sich anders vorstellt: Den Großteil der Zeit verbringt man tatsächlich im Inneren des Schiffs. Das liegt vor allem an den oft rauen Wetterbedingungen. Gearbeitet wird in verschiedenen Laboren oder, wenn möglich, an Deck zum Auswerfen und Einholen der Verankerungen sowie Gliedern.

Im Chemielabor werden Proben analysiert, während in anderen Bereichen Geräte vorbereitet, Daten ausgewertet und die nächsten Schritte geplant werden. Ein zentraler Bestandteil ist die Arbeit mit der CTD, also das Messen von Leitfähigkeit, Temperatur und Tiefe im Wasser.

Natürlich läuft nicht immer alles reibungslos. Wenn beim Aussetzen einer Verankerung ein Gerät nicht funktioniert, muss die gesamte Konstruktion wieder eingeholt, repariert und neu ausgebracht werden. In solchen Momenten ist gute Stimmung entscheidend, meine Empfehlung: einfach mal spontan Macarena tanzen. Das kann Wunder bewirken.

Trotz der intensiven Arbeit ist es genau diese Mischung aus Teamarbeit, gemeinsamen Herausforderungen und spontanen Momenten, die das Leben an Bord so besonders macht. Das gemeinsame Rätseln im CTD-Labor und die Planung unter wechselnden Wetterbedingungen, all das schweißt zusammen.

Nach drei Wochen wird das Schiff mehr als nur ein Arbeitsplatz, es wird zu einem kleinen, schwimmenden Zuhause auf Zeit.

Life and Work on Board a Research Vessel

This is my (Julia Pelle) first sea voyage, my first time spending more than just a day out on the ocean. And yes, the Labrador Sea might not be the easiest place to start. Like many others, I got properly seasick on the first night. The movement of the Maria S. Merian in such rough conditions were definitely challenging at first. But after a few exhausting hours, plenty of sleep, and some weather-related work delays, I gradually got used to the constant motion. Just like that, everyday life on board began.

So how do you describe life on a research vessel to someone who has never experienced it?

Let’s start with the basics, the daily routine on board:

Food:
Catering is excellent: breakfast is served at 7:30 a.m., lunch at 11:30 a.m., and dinner as early as 5:30 p.m. In addition, there is a small fridge stocked with snacks available 24/7 so no one goes hungry.

Sleep:
Good sleep is not always guaranteed, but you quickly learn to adapt. Most scientists share double cabins with a shared bathroom. Those on night shifts naturally switch their day and night. A helpful tip from an experienced sailor: place a blanket under one side of your mattress to create a small dip this helps keep you from rolling around. My personal trick is to sleep on my stomach and stabilize myself with elbows and knees. That way, even in strong winds and heavy seas, I can sleep surprisingly well almost “like being held by your mom,” as Sascha would say.

Free time on board:
You are rarely alone here and that’s a good thing. There is almost always something going on in the labs, especially in the CTD lab, which quickly becomes a social hub. Our chief scientist, Fehmi, is aiming to break a new CTD record, which means we spend a lot of time there to the delight of some and the challenge of our chemists.

In the evenings, people often gather in the hangar or the mess room to wind down with a drink after work. One highlight is our “real-time Werewolf” game: roles were assigned a few days ago, and since then, one person is “eliminated” each night. During the day, everyone debates and votes. So far, the “ship community” is doing quite well after three days, three werewolves have already been identified. We’re curious to see for whom today’s sunrise will be the last.

Sports and relaxation:
For those who want to stay active, there is a small gym near the bow, equipped with weights, a bike, a rowing machine, and even a treadmill though using it in rough seas requires a bit of courage. Every three days, there is also a circuit training session led by Sven, our Chief Engineer. Afterwards, the sauna offers a perfect way to relax.

Working on the ship:
Even though you might imagine otherwise, most of the time is actually spent inside the ship, mainly due to the often harsh weather conditions. Work takes place in various laboratories or, when possible, on deck deploying and recovering moorings and equipment.

In the chemistry lab, samples are processed, while in other labs instruments are prepared, data is analysed, and plans for the coming days are made. A central part of the work is the CTD, which measures conductivity, temperature, and depth in the water.

Of course, things don’t always go smoothly. If a device fails while deploying a mooring, the entire setup has to be recovered, repaired, and redeployed. In moments like these, keeping a good mood is essential my recommendation: just dance the Macarena. It works surprisingly well.

Despite the demanding workload, it is exactly this mix of teamwork, shared challenges, and spontaneous moments that makes life on board so special. Figuring things out together in the CTD lab and planning around constantly changing weather conditions. All of this brings people closer together.

After three weeks, the ship becomes more than just a workplace it turns into a small, floating home.

Leben und arbeiten an Bord eines Forschungsschiffs