Promotores: Prof.dr. W.J.G.M. Peijnenburg & Dr. M.G. Vijver

As a non-invasive genetic method, eDNA based approaches have become an important component of ecologists' and environmental managers' toolkits for biomonitoring in conservation and an increasingly important source of ecological knowledge.

How can species literacy in the Netherlands be explained and improved?

Do understudied animals contain hidden species?

This thesis describes the genetic and prokaryotic diversity of giant barrel sponges.

In his dissertation Michiel Hooykaas outlines the results of six empirical research projects focused at biodiversity awareness in the Netherlands, specifically people’s knowledge about animals.

Promotor: E. Gittenberger, Co-promotor: B.W. Hoeksema

This research studies the authenticity of the texts and tries to find an accurate dating to them using other parallel texts (Sahidic and Arabic), and aims to find out how the people of this age viewed their hero, the founder of orthodoxy, Athanasius.

Which traits did change due to the invasion process of plants and how do these traits contribute to the invasiveness of such species. What is the role of carbohydrate accumulation? What is the function of carbohydrate accumulation in plants? Is genetic variation depleted in invasive species under se…

What impact does a mid-season wildfire have on grassland invertebrates?

In the last couple of decades an ‘animal turn’ has taken place in the social sciences. This has led to a call to study social issues by including non-human animal perspectives. This Collaborative Research Group thinks it's high time that African Studies joins the chorus of minds that try to contribute…

Does a mid-season fire impact invertebrate populations?

This article provides a behavioral perspective that examines responsibility attribution to the national government (upward) and policy implementers (downward) as a function of performance relative to decision-makers' aspiration levels. The study proposes that perceived accountability increases the propensity…

In this policy brief, Dennis Broeders, Els De Busser and Patryk Pawlak discuss attribution of in cyberspace from three different perspectives: criminal law, international law and policy. Published together with EU Cyber Direct.

Promotor: Prof.dr. E. Smets, Dr. M. Stech

Development of Natural Resource for New Medicines

This monograph focuses on clustering of objects in high-dimensional data, given the restriction that the objects do not cluster on all the attributes, not even on a single subset of attributes, but often on different subsets of attributes in the data.

Ibrahim Saweros defended his thesis on 9 November 2016

The disappearance and reappearance of species of plants in the Netherlands is a normal phenomenon. In the period from 1981-2000 the number of plants to have disappeared was considerably lower than previously, whereas the number of species rediscovered is much higher. Climate change may be the cause.

An international team including Peter van Bodegom shows how trait variability can be incorporated in Essential Biodiversity Variables to allow monitoring how organisms respond to global change. They published their results in the journal Nature Ecology & Evolution.

My PhD thesis investigates the ecological significance of resistance against drought-induced air bubble formation inside the water conduits of plants (embolism), and the plasticity and functional aspects of stem anatomical traits in woody and herbaceous species.

What is the effect of light at night on plant phenology and physiology, and how does this affect plant interactions with other species?

Himalayan environments have changed and continue to change as a result of how people interpret, source, and use them. Scholarly investigation of the induced transformations, whether in deforestation, dam construction, or glacial melt, highlights how man is shaping the world in the Anthropocene.

Does the presence of Ring-necked parakeets negatively influence feeding and feeding behaviour of native bird species on artificial bird feeders and if so, what are possible solutions?

In this thesis, I study 1) metabolic alterations in tuberculosis related to wasting syndrome in human patients as well as in rodent and fish animal models. 2) effects of the mutation of the leptin gene on cachexia and diabetes in rodent and zebrafish animal models.

How can we quantify the density of species within a community through environmental DNA concentrations?

Vocal learning is a trait shared by songbirds and humans. It is also a trait that is restricted by the brain rather than by a species' vocal apparatus. In this dissertation, functional MRI is employed in both species in order to explore potential common neural mechanisms underlying the ability to develop…

Promotor: P.G.L. Klinkhamer, Co-Promotores: K. Vrieling, P.P.J. Mulder

What are the phylogenetic relationships among the members of speciation bursts?

Describe and identify what dosimetry parameters are of importance to interpret dose-response relationships (eg., mortality, sub-lethal, growth or reproduction inhabitation, DNA damage and reactive oxygen species, etc. ) for metal-based nanoparticles? How to develop quantitative models that enable to…

Freshwater is an important resource, but at a great risk of species decline due to habitat loss, pollution and over-exploitation, and invasive alien species.

Paleobotanist Menno Booi discovered that 250 previously described fossil tree species are objectively not distinguishable; they belong to only one single species.

For the first time research has been done on species literacy in the Netherlands. Children in primary schools know about 1 in 3 native animal species. Publication in Biological Conservation.

The habitats of freshwater fish species are threatened by global warming, mainly due to rising water temperatures. This is the conclusion of a study led by Radboud University, in collaboration with Utrecht University, PBL Netherlands Environmental Assessment Agency, Leiden University and others. The…

Promotor: Prof.dr. P.G.L Klinkhamer

Plants and their pollinators form complex interaction networks. Within these networks, species differ widely in the number of species they interact with.

Coaching in a team context can be very effective. Working together to innovate and learn will lead to long lasting improvements.

How does invasive hybridization affect threatened native species?

What the Sex Lives of Bugs, Birds, and Beasts Tell Us About Evolution, Biodiversity, and Ourselves, Menno Schilthuizen reports from the front lines of evolutionary biology, on a quest to make sense of the origins, workings and evolution of our and other species’ reproductive selves.

Leiden scientists have discovered a new plant genus with two new species at a potential nickel mine site in Indonesia. Remarkable characteristic of the plants: they store manganese in their leaves.

Coral reefs throughout the world are under threat. After studying the reefs in Malaysia, Zarinah Waheed concluded that there is room for improvement in coral reef conservation. PhD defence 22 November.

The first objective is to create a catalogue raisonée, i.e. a structured database that will store the main attributes of each town in a standardized format database, which will be freely accessible when completed; the second objective is to exploit theories and methods that can help us to understand…

The high prevalence of pure red cell aplasia in Thailand has been associated with the sharp increase in number of recombinant human erythropoietin (rhEPO) copy products, based on a classical generic regulatory pathway, which have entered the market.

‘In a hole under water there lived a hobbit’: a new species of shrimp named after Bilbo Baggings. Biology student Werner de Gier described this newly discovered species during his bachelor internship at Naturalis Biodiversity Center.

When biology student Mike Groenhof was making a phylogenetic tree of fifty shrimp species for his internship, one specimen turned out to be an undescribed species. The animal was collected by Naturalis scientist 18 years ago, and had been under the radar ever since.

Researchers from Biomon have used DNA-techniques to find 40 different species of fish in the river Dommel. This technique is capable of detecting more species than conventional methods of measuring.

Can trees adapt to (climate) change? Which trees are more or less capable of doing so, and why? A group of researchers from all over the world set to work on these questions. Professor of Environmental Biology Peter van Bodegom helped to classify the functional traits of tree species. These are for…

A plant that takes metal from the ground all by itself: a natural way to mine or to clean the soil. PhD student Roderick Bouman (Hortus Botanicus Leiden) described a new plant species from Sabah, Borneo, which can be used to extract nickel. In an open access article in Botanical studies, he and the…

Engineered nanomaterials (ENMs) are widely used, and nanotechnological innovations grow with rapid pace. Studies on nanotoxicology have demonstrated that chemical toxicology as well as particle toxicology should be accounted for in predicting the safety of ENMs.