|A list including citations is available via Google scholar|
P. Zhang, R.F. van den Berg, C.H.A. van Leeuwen, B.A. Blonk, E.S. Bakker, (2018)
Aquatic omnivores shift their trophic position towards increased plant consumption as plant stoichiometry becomes more similar to their body stoichiometry
PLoS ONE pdf
Content: Eutrophication in aquatic ecosystems increases plant nutrient concentrations. We experimentally showed that aquatic omivores shift to a more plant-based diet in more eutrophied aquatic systems, because plants become relatively more attractive food sources. Because most aquatic consumers are omnivores, increased nutrient loadings into aquatic systems may increase top-down control on aquatic plants.
Strong pair bonds and high site fidelity in a subarctic-breeding migratory shorebird
The Wilson Journal of Ornithology 130(1):140-151 pdf
Content: We investgated mate and site fidelity of the migratory shorebird Pacific Dunlin (Calidris alpina pacifica) breeding at the subarctic Yukon-Kuskokwim Delta, Alaska, USA. We found subarctic-breeding Dunlin to strongly prefer previous breeding locations and previous mates when these were available in consecutive breeding attempts. However, if sites or mates were unavailable for breeding, their behavior prioritized early nest initiation and fast renesting over mate and site fidelity. This study illustrates the high importance of timing for migratory birds nesting in the short subarctic summer.
Mechanisms of invasion resistance of aquatic plant communities
Ecology and Evolution 6(8):2414-2425 pdf
Content: Fishways with restricted seasonal operation times were found to affect upstream spawning migrations of both spring and autumn spawning salmonid fish. We discuss possible effects of late opening and early closing of fish passages in a theoretical framework, in which we propose that movement restrictions of migratory individuals in partially migratory populations can also indirectly affect conditions for resident fish in the same river system.
Internal transport of alien and native plants by geese and ducks - an experimental study
Freshwater Biology 60(7): 1316-1329 pdf
Content: Experiments on the transport of plant seeds by waterbirds revealed that: i) smaller ducks differ from larger geese in their role as dispersal vectors ii) invasive water primrose Ludwigia grandiflora has a greater dispersal potential than invasive cordgrass Spartina densiflora, which is consistent with its faster range expansion across Europe, and iii) maximum retention times of wetland seeds have been underestimated in previous experimental studies that lasted only 1–2 days, as intact seeds were retrieved from faeces for up to 4 days after ingestion. More attention should be paid to the role of waterbirds as vectors of alien plants and to the role of migratory geese as vectors of plants in general.
Hydrology, shore morphology and species traits affect seed dispersal, germination and community assembly in riparian plant communities.
Journal of Ecology 102: 998-1007 pdf
Content: Seed dispersal and germination of plants on the shores of wetlands is influenced by water level fluctuations, shore morphology and seed characteristics. Active water level management and shore restoration can contribute to the creation of rich riparian plant communities.
Van Leeuwen, C.H.A., N. Huig, G. van der Velde, T.A. van Alen, C.A.M. Wagemaker, C.D.H. Sherman, M. Klaassen and J. Figuerola (2013)
How did this snail get here? Multiple dispersal vectors inferred for an aquatic invasive species.
Freshwater Biology 58(1): 88-99 pdf
Content: Microsatellite analyses reveal how invasive aquatic snails (Physa acuta) can colonize isolated freshwater ponds in Doñana National Park (Spain) by using a multitude of passive dispersal vectors: water currents, waterbirds and large mammals.
Van Leeuwen, C.H.A., G. van der Velde, J.M. van Groenendael and M. Klaassen (2012)
Gut travellers: internal dispersal of aquatic organisms by waterfowl.
Content: This is the first quantitative meta-analysis on internal transport of aquatic invertebrates and wetland plant seeds by waterbirds. Analysis of over 80 publications (which can be found in supplementary 1) indicates the state of the art on bird-mediated dispersal, and is used to present the first calculations on the quantitative and qualitative importance of endozoochory as a long distance dispersal mechanism.
Van Leeuwen, C.H.A. and G. van der Velde (2012)
Prerequisites for flying snails: external transport potential of aquatic snails by waterbirds.
Freshwater Science 31(3): 963-972 pdf
Content: This study experimentally addresses dispersal of snails on the outside of birds, known as ectozoochory. A large selection of aquatic snail species is highly tolerant to desiccation, will attach readily to the exterior of waterbirds, and can stay attached for over 8 hours in drying mud. Aquatic snails appear to have all the necessary prerequisites for successful zoochory by birds or other large animals.
Van Leeuwen, C.H.A., M.L. Tollenaar, and M. Klaassen (2012)
Vector activity and propagule size affect dispersal potential by vertebrates.
Oecologia 170(1): 101-109 pdf
Content: In this paper we describe how physical activity of mallards (Anas platyrhynchos), in the form of swimming, alters their digestive physiology. This has implications for the construction of seed dispersal kernels by zoochory, which have to date always been based on seed release patterns obtained from experiments with resting animals. We show for the first time that modelling dispersal kernels to predict seed dispersal distances by zoochory should incorporate potential digestive changes induced by the physical movement of animal vectors.
Van Leeuwen, C.H.A., G. Van der Velde, B. Van Lith, and M. Klaassen (2012)
Experimental quantification of long distance dispersal potential of aquatic snails in the gut of migratory birds.
PLoS ONE 7:e32292 pdf
Content: This publication shows how aquatic snails can survive digestion of waterbirds. In a feeding experiment, snails were retrieved over five hours after ingestion, indicating for the first time that long distance endozoochory of aquatic snails is possible.
Dietz M.W., B. Spaans, A. Dekinga, M. Klaassen, H. Korthals, C.H.A. van Leeuwen, and T. Piersma (2010)
Do red knots (Calidris canutus islandica) routinely skip Iceland during southward migration?
Condor 112(1): 48-55 pdf
Content: Stable isotope analyses of red knots (Calidris canutus islandica) reveal that these birds do not always use all available stopover sites on migration, but that direct migration from Greenland to Western-Europe occurs without a stopover in Iceland, even for juveniles.
Klaassen, R.H.G., B.A. Nolet, and C.H.A. van Leeuwen (2007)
Prior knowledge about spatial pattern affects patch assessment rather than movement between patches in tactile-feeding mallard.
Journal of Animal Ecology 76(1): 20-29 pdf
Content: This experiment with mallards (Anas platyrhynchos) reveals that birds searching for cryptic food items can make use spatial patterns to optimize their food intake over time.