Have you ever spotted a shiny, green sphere tucked into a crack on a reef? If so, you may have seen a sea pearl, also known as bubble algae or sailor’s eyeballs. Sea pearls (Valonia ventricosa) are one of the largest – if not the largest – single cell organisms in the world! In other words, that fluid-filled sphere is actually one giant single cell (which can be 1-5 cm in diametre, and boasts multiple nuclei)!
Generally, macroalgae like sea pearls are classified into three categories: Green, Brown, or Red Algae. An algae’s classification is not based explicitly on the coloir of the algae, but rather on their predominant photosynthetic pigment, a substance that absorbs light.
Sea Pearl is a Green Algae, which means that it falls into the Phylum Chlorophyta. All Green Algae contain the same accessory pigment, Chlorophyll b, which broadens the range of light that can be used in photosynthesis. More light absorption = more food!
The colour of a Sea Pearl typically ranges between green to dark green, and it is determined by the quantity of chloroplasts. Sea pearls reproduce by splitting into two daughter cells or by forming new bubbles from the rhizoids. But little is known about their mode of sexual reproduction.
Sea pearls can be found in subtropical and tropical tidal zones throughout much of the world. Two other species of Valonia found in the Caribbean include: elongated sea pearl (Valonia macrophysa), which tend to be smaller, longer and grow in mat-like clusters, and 2) creeping bubble alga (Valonia ulticularis). creeping bubble alga is the smallest and the least common of the three species mentioned.
Do you have a favourite microorganism, overlooked algae or cryptic creature that you would like to see featured on our website? Shoot us a message and let us know!
Fieldwork Wrap-Up: Strengthening MPA Management in The Bahamas
Marine protected areas (MPAs) are critical tools in the conservation of marine species and habitats, safeguarding reefs, seagrasses, and mangroves that provide vital ecosystem services
Coral Reef Monitoring with Photogrammetry: A New Era in Reef Health Assessment
Coral reefs are some of the most biodiverse ecosystems on the planet, providing crucial habitat for marine life and protecting coastal regions from erosion. Yet,
Watch “We Among the Reef:” A Documentary on the Abaco Barrier Reef
The Perry Institute for Marine Science invites you to watch “We Among the Reef,” a compelling documentary that illuminates the significance of the Abaco Barrier
Guardians of the Deep: With Training from PIMS, Key Government Staff Become PADI Certified Divers
Akehia Thompson (DMR), Quetta Gibson (DMR), and Gilles Deal (DEPP) share a moment of camaraderie in their scuba gear, embarking on their training journey with
Powering the Next Wave: Celebrating the Conclusion of Our 2024 Rising Tides Program
The Rising Tides program, an initiative of the Perry Institute for Marine Science, is nurturing the next generation of conservationists in The Bahamas. Through classroom instruction and field studies, Bahamian students are inspired and equipped with knowledge and skills for careers in marine science, conservation, and research. The program has certified students as PADI Open Water Divers and Reef Rescue Divers, paving the way for future academic and professional opportunities. The impact of the Rising Tides program is best expressed through the voices of its passionate participants, who share their transformative experiences and dreams for the future of marine conservation.
Exploring Little Inagua’s Coral Reef & Seagrass Habitats
Marine researchers from the Perry Institute for Marine Science (PIMS) and the Bahamas National Trust (BNT) collaborate for an expedition in the southern Bahamas. The