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PhD candidate Behavioural Ecology Group





Liesa Celie



I have always been drawn to the sea. When on holiday as a child, you could always find me in the water, snorkeling. I quickly learned that quietly floating in the water was the best way to observe all the beauty that is beneath the water surface and the natural behaviour of the animals. I became mesmerized by this magical marine ecosystem and, from a young age, I decide I wanted to be a marine biologist. Determined to follow this dream, I focused my studies on marine ecology. This is where my interest in sea turtles, their behaviour and conservation grew. Currently, I am fortunate enough to work on a PhD focused on these topics at the Behavioural ecology group at Wageningen University & Research, under the guidance of Dr. Lysanne Snijders and in cooperation with Dr. Mirte Bosse from the Animal Breeding and Genomics group.


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Research interests


Marine Ecology

Behavioural Biology

Conservation Biology

Conservation Genetics


About me


After completing my BSc and MSc in Biology in Belgium, I decided to move to the Netherlands to pursue my dream and continue with the MSc Aquaculture and Marine Resource Management at Wageningen University. During my studies, I discovered my passion for sea turtles and was able to complete a thesis on the effect of green turtle grazing behaviour and conspecific encounters on seagrass species dynamics in Lac Bay, Bonaire. I also completed an internship linking green sea turtle abundance and grazing to windsurfers and seagrass occurrence in Lac Bay, Bonaire. During my MSc, I had the opportunity to work on a PhD proposal together with an extremely motivated and supportive team of scientists. Dr. Lysanne Snijders (BHE group) and Dr. Mirte Bosse (ABG group) eventually became my official supervisors when the PhD got funded in 2024. After working for a few years in the Belgian fisheries management sector, I officially joined the Behavioural Ecology group at WUR as a PhD student. In my PhD project, I will study the functional consequences of sea turtle hybridization


Project: Functional consequences of Sea Turtle hybridization

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As keystone species, sea turtles connect different habitats through migration and maintain habitat balance through their foraging behaviour. As such, they increase the habitat productivity and support the ecosystem services. In combination with their endangered status, this has led them to be the subject of many conservation efforts. In the last 130 years, interspecific hybridization in sea turtles has been observed, but recently it has been reported more frequently, raising questions about its effects. While hybridization may promote genetic diversity and increase their adaptive potential, it could also disrupt functional roles and ultimately lead to species loss. This project will determine whether a further increase in the percentage of sea turtle hybrids is to be expected and how hybridization may alter the keystone roles sea turtles currently fulfill in their environment. We will study three sea turtle species in two breeding sites, using a complementary combination of nest monitoring, genetic analysis, stable isotope analysis and behavioural assays. This approach will allow us to conduct large-scale genetic screening to identify hybrids and test Hubbs’ “desperation hypothesis”. We will assess whether hybridization is likely to alter the species’ functional role in the ecosystem and examine hybrid fertility. Consequently, we will make predictions about the viability of sea turtle hybrids, considering the selection occurring on hybrid alleles. Our project aims to generate important insights into the role of hybridization in the ecology and conservation of endangered species, contribute to evidence-based decision-making concerning the management of sea turtles, and provide essential tools and knowledge for future research and management.


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Functional consequences of Sea Turtle hybridization


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Liesa Celie



PhD candidate
Behaviour Ecology group
Department of Animal Sciences
Wageningen University
Zodiac building
liesa.celie@wur.nl


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