Eelke Jongejans
Radboud University Nijmegen
Publications 120
#1Knut RydgrenH-Index: 23
#2Inger AuestadH-Index: 7
Last.Jan Sulavik (AMNH: American Museum of Natural History)H-Index: 1
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#1Graham A. Montgomery (UConn: University of Connecticut)
#2Robert R. Dunn (NCSU: North Carolina State University)H-Index: 45
Last.David L. Wagner (UConn: University of Connecticut)H-Index: 26
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Abstract In recent decades, entomologists have documented alarming declines in occurrence, taxonomic richness, and geographic range of insects around the world. Additionally, some recent studies have reported that insect abundance and biomass, often of common species, are rapidly declining, which has led some to dub the phenomenon an “Insect Apocalypse”. Recent reports are sufficiently robust to justify immediate actions to protect insect biodiversity worldwide. We caution, however, that we do n...
1 CitationsSource
#1Marjolein Bruijning (Princeton University)H-Index: 3
#2C. Jessica E. Metcalf (Princeton University)H-Index: 25
Last.Julien F. Ayroles (Princeton University)H-Index: 21
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Genetically identical individuals can be phenotypically variable, even in constant environmental conditions. The ubiquity of this phenomenon, known as ‘intra-genotypic variability’, is increasingly evident and the relevant mechanistic underpinnings are beginning to be understood. In parallel, theory has delineated a number of formal expectations for contexts in which such a feature would be adaptive. Here, we review empirical evidence across biological systems and theoretical expectations, inclu...
1 CitationsSource
#1Judy P. Che-Castaldo (Lincoln Park Zoo)H-Index: 7
#2Owen R. Jones (University of Southern Denmark)H-Index: 22
Last.Roberto Salguero-Gómez (University of Oxford)H-Index: 20
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#1Andrew M. Allen (Radboud University Nijmegen)H-Index: 8
#2Bruno J. EnsH-Index: 36
Last.Eelke Jongejans (Radboud University Nijmegen)H-Index: 30
view all 9 authors...
Background Ring wear and loss may have important consequences for mark-recapture studies that aim to estimate survival trends. Our study quantifies the rates of wear and loss from a long-running colour-ringing project of the Eurasian Oystercatcher (Haematopus ostralegus) in the Netherlands.
Feeding specialization is a common cause of individual variation. Fitness payoffs of specialization vary with environmental conditions, but the underlying behavioral mechanisms are poorly understood. Such mechanistic knowledge, however, is crucial to reliably predict responses of heterogeneous populations to environmental change. We quantified spatiotemporal allocation of foraging behavior in wintering Eurasian oystercatchers (Haematopus ostralegus), a species in which feeding specialization can...
#1M.J.E. Broekman (Radboud University Nijmegen)H-Index: 1
#2Helene C. Muller-Landau (STRI: Smithsonian Tropical Research Institute)H-Index: 51
Last.Hans de Kroon (Radboud University Nijmegen)H-Index: 46
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1 CitationsSource
#1Jan H. Vikane (University of Bergen)H-Index: 2
#2Knut RydgrenH-Index: 23
Last.Vigdis Vandvik (University of Bergen)H-Index: 24
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Plant species of semi-natural grasslands are threatened by several simultaneous global change drivers, most notably land-use and climate change. In this study, we explore spatiotemporal variation and changes in deterministic (λ) and stochastic population growth rates (λs), and the underlying vital rates of eight populations of Arnica montana at the species’ north-western range margin in Norway. We assess to what extent variation in the demographic rates could be attributed to environmental corre...
#1Henk Siepel (Radboud University Nijmegen)H-Index: 19
#2Roland Bobbink (Radboud University Nijmegen)H-Index: 39
Last.Eelke Jongejans (Radboud University Nijmegen)H-Index: 30
view all 5 authors...
We tested the long-term effects of liming on soil micro-arthropods in a stand of Scotch pine on former drift sand in the Netherlands. To counteract the effects of acidification, liming was applied in increasing quantities from 0 (control), 3, 6, 9 and 18 ton ha−1 on experimental plots over the course of 1985 and 1986. Soil samples for chemical analyses and those for extraction of soil micro-arthropods were taken in October 2017, 32 years after application. Liming did restore the buffer capacity ...
#1Raziel Davison (UCSB: University of California, Santa Barbara)H-Index: 5
#2Marc Stadman (Radboud University Nijmegen)
Last.Eelke Jongejans (Radboud University Nijmegen)H-Index: 30
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Abstract Demographic rates differ between populations and also fluctuate over time, sometimes driving large fitness differences, but the strength of stochastic effects remain heretofore unresolved. We demonstrate the importance of stochastic processes by comparing the drivers of long-term population growth. We quantify stochastic contributions to differences in population growth rates among 218 plant and two animal populations representing 62 species (all records from the COMPADRE and COMADRE ma...