Seal research at the Dollard
Since 2015, we have been observing the seals residing in the Dollard every year. Researchers Bea and Marga have collected data from more than 400 seals - mothers and their pups - over the years. Thanks to this long-term research, we gain valuable insights into the behaviour of these animals. On this page, you will discover how we conduct the research and read the main findings.
Ongoing research in a unique environment
In 2015, the research project began in the Dollard. Every day during high tide, seal mothers with their pups seek a spot at the bottom of the dike to rest, eat and sunbathe. An ideal spot for behavioural research. Far away, behind a viewing wall and in complete peace and quiet, marine biologists Beatriz Rapado-Tamarit (Bea) and Margarita Méndez Aróstegui (Marga) annually study the behaviour of these animals in their natural habitat.
Sharing knowledge
The research not only gives us insight into the behaviour of wild seals, but also into the state of the ecosystem in which humans and animals live together. The knowledge also helps prevent seals from getting into trouble. We actively share the findings with fellow researchers worldwide so that seals elsewhere also benefit.
What we learned so far
One of the most important discoveries is how long seal pups are left alone by their mothers. This knowledge directly influenced our work. Partly as a result of this research, national policy has changed: nowadays there are special seal guards and stricter observation rules. As a result, pups are less likely to be taken from the wild. A development we are proud of!
Our methodologies
Recognising seals by their fur
To track individual seals, we look at their unique fur pattern - similar to a human fingerprint. Using photo identification, we can recognise and track the animals at a safe distance.
Detailed field observations
From late May to mid-July, the team observes the behaviour of seal mothers and their pups daily - always tuned to low tide. Behind the viewing wall, they collect data on feeding, behaviour and interactions. Read how that works in practice.
Research questions
Philopatry in seals
Some seals return to the place where they themselves were born to give birth to their pup. We call this birth philopatry. Bea and Marga investigate how often this happens and why.
Maternity approach of seal moms
Each species raises its young in its own way. Elephants sometimes stay with their mothers for years, while seal pups are abandoned after only three weeks. What is striking: seal mothers sometimes give milk to other pups as well. Why do they do that? That is what we are trying to understand.
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