A devastating blow to nature: Over 2,300 majestic Dalmatian Pelicans vanished from Greece, leaving scientists scrambling to understand the cause and assess the future. Three years after the world's largest Dalmatian Pelican colony at Lake Mikri Prespa in northern Greece experienced a catastrophic 60% decline, researchers have made crucial discoveries about the avian flu's impact on these magnificent birds across Greek wetlands.
The collaborative research, spearheaded by the Society for the Protection of Prespa (SPP) and the Spanish research institute IREC/CSIC, has unveiled a grim reality. The avian flu virus, likely introduced by migratory waterfowl like ducks and geese from colder northern regions, decimated the pelican population.
Here's the intriguing part: while ducks and geese carried the virus, they showed no symptoms. They unknowingly spread the disease through their droppings on the small islands where both groups rested. This highlights the complex ways diseases can spread through wildlife, often silently.
But here's where it gets controversial... Great White Pelicans, nesting alongside the infected colonies, remained completely untouched by the virus. Also, colonies in Western Greece (Amvrakikos Gulf and Messolonghi lagoons) escaped the outbreak. Scientists believe that higher temperatures and water salinity in these areas may have created an environment that inhibited the virus, offering a glimmer of hope for future prevention strategies.
Signs of hope emerge from the ashes. Olga Alexandrou, a forester-ornithologist for the SPP, observed a fascinating physical marker of survival: cloudy corneas. Pelicans that survived the initial infection often developed a “foggy” eye, indicating they had successfully fought off the disease and were now breeding again. Furthermore, blood samples from 2023 showed that chicks carried avian flu antibodies, suggesting that survivors are passing on immune protection to the next generation, a vital step in rebuilding the population.
Despite these signs of resilience, the situation remains precarious. The 2022 outbreak stands as the worst ecological disaster for wildlife in Greek history, wiping out 40% of the Southeast European breeding population, which is roughly 10% of the entire global species.
The road to recovery will be long and arduous. Pelicans face several challenges:
- Slow Reproduction: They don't reach breeding age until 3–4 years old and typically raise only one chick per year, limiting their ability to quickly replenish their numbers.
- Predation and Climate: In 2023, an extreme drought allowed jackals to reach previously isolated nesting islands, leading to the loss of hundreds of chicks. This highlights the devastating impact of climate change on vulnerable species.
- Viral Mutation: Scientists remain vigilant, as new, highly virulent strains are currently affecting Western Europe, where over 80,000 cranes have perished recently. This underscores the ever-present threat of evolving viruses.
“For large-bodied birds with these characteristics, it takes decades to recover from such a significant blow,” warns Alexandrou. “In this uncertain environment, we don’t know when Prespa will return to its 2022 level of 1,400 breeding pairs.”
What are your thoughts? Do you think enough is being done to protect these vulnerable species? Share your opinions in the comments below!
