Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies
if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the
same subfield and year (this is the minimum needed to enter the top 1%, not the average
within it), or reaches the top citation threshold in at least one of its specific research
topics.
Consistent individual differences in early exploratory behaviour of male great tits
This map shows the geographic impact of P.R. Wiepkema's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by P.R. Wiepkema with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites P.R. Wiepkema more than expected).
This network shows the impact of papers produced by P.R. Wiepkema. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by P.R. Wiepkema. The network helps show where P.R. Wiepkema may publish in the future.
Co-authorship network of co-authors of P.R. Wiepkema
This figure shows the co-authorship network connecting the top 25 collaborators of P.R. Wiepkema.
A scholar is included among the top collaborators of P.R. Wiepkema based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with P.R. Wiepkema. P.R. Wiepkema is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
McBain, James, et al.. (1993). The food consumption of Commerson's dolphins (Cephalorhynchus commersonii).. Aquatic Mammals. 19. 99–121.22 indexed citations
3.
Wiepkema, P.R., W.G.P. Schouten, & P. Koene. (1993). Biological aspects of animal welfare: new perspectives.. Journal of Agricultural and Environmental Ethics. 6(2). 93–103.4 indexed citations
4.
Koene, P., et al.. (1992). Heartrate increases during expectation and consumption of feed in laying hens.. Journal of Animal Science. 70. 159–159.4 indexed citations
Kershaw, Joanna, et al.. (1991). The food consumption of Southern elephant seals (Mirounga leonina).. Aquatic Mammals. 17(2). 76–87.2 indexed citations
7.
Wiepkema, P.R., et al.. (1991). The suckling period of a grey seal ( Halichoerus grypus ) while the mother had access to a pool. Aquatic Mammals. 17(1). 42–51.3 indexed citations
8.
Wiepkema, P.R., et al.. (1990). The suckling period of a Grey seal (Halichoerus grypus) while confined to an outdoor land area.. Aquatic Mammals. 16. 120–128.2 indexed citations
9.
Tielen, M.J.M., et al.. (1990). New ways of improving the health and welfare of pigs by introducing a 'specific stress-free' system.. Tijdschrift voor diergeneeskunde. 116(18). 837–846.2 indexed citations
10.
Kastelein, Ronald A., N. D. Vaughan, & P.R. Wiepkema. (1990). The food consumption of Steller sea lions (Eumetopias jubatus).. Aquatic Mammals. 15(4). 137–144.24 indexed citations
11.
Tielen, M.J.M., et al.. (1990). [Current possibilities of improving health and welfare status of pigs through introduction of the specific 'Stress Free' (SSF) System].. PubMed. 115(18). 837–46.4 indexed citations
Wiepkema, P.R., et al.. (1989). The use of molluscs to occupy pacific walrusses (Odobenus rosmarus divergens) in human care.. Aquatic Mammals. 15. 6–8.7 indexed citations
15.
Kastelein, Ronald A. & P.R. Wiepkema. (1989). A digging trough as occupational therapy for pacific walrusses (Odobenus rosmarus divergeus) in human care.. Aquatic Mammals. 15. 9–17.20 indexed citations
16.
Wiepkema, P.R., et al.. (1988). Case study of the neonatal period of a Grey seal pup (Halichoerus grypus) in captivity.. Aquatic Mammals. 14. 33–38.5 indexed citations
17.
Wiepkema, P.R., et al.. (1988). The significance of training for the behaviour of Steller sea lions (Enmetopias jubata) in human care.. Aquatic Mammals. 14. 39–41.7 indexed citations
18.
Ruiter, L. de, P.R. Wiepkema, & Jan G. Veening. (1974). Models of Behavior and the Hypothalamus. Progress in brain research. 41. 481–507.5 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.