Data from: Accounting for interspecific competition and age structure in demographic analyses of density dependence improves predictions of fluctuations in population size
Gamelon, Marlène, Norwegian University of Science and Technology
Vriend, Stefan J.G., Norwegian University of Science and Technology
Engen, Steinar, Norwegian University of Science and Technology
Adriaensen, Frank, University of Antwerp
Dhondt, Andre A., Cornell University
Evans, Simon R., University of Oxford
Matthysen, Erik, University of Antwerp
Sheldon, Ben C., University of Oxford
Sæther, Bernt-Erik, Norwegian University of Science and Technology
Published Mar 01, 2019 on Dryad.
Cite this dataset
Gamelon, Marlène et al. (2019). Data from: Accounting for interspecific competition and age structure in demographic analyses of density dependence improves predictions of fluctuations in population size [Dataset]. Dryad. https://doi.org/10.5061/dryad.45873cg
Understanding species coexistence has long been a major goal of ecology. Coexistence theory for two competing species posits that intraspecific density dependence should be stronger than interspecific density dependence. Great tits and blue tits are two bird species that compete for food resources and nesting cavities. Based on long-term monitoring of these two competing species at sites across Europe, combining observational and manipulative approaches, we show that the strength of density regulation is similar for both species, and that individuals have contrasting abilities to compete depending on their age. For great tits, density regulation is driven mainly by intraspecific competition. In contrast, for blue tits, interspecific competition contributes as much as intraspecific competition, consistent with asymmetric competition between the two species. In addition, including age-specific effects of intra- and interspecific competition in density-dependence models improves predictions of fluctuations in population size by up to three times.
Fully annotated R code corresponding to 1) the IPM; 2) the 3 density-dependence models shown in the paper.
For the 11 sites included in the study (see Appendix S1 for a map), for both great tit (GT) and blue tit populations (BT), the year of breeding "YearOfBreeding", the female identity "MotherID", its age "AgeMother", its status "StatusMother" ("I" immigrant; "R" locally recruited; "S" survived from previous year) and the number of daughters locally recruited "NumDaughtersLocal" are provided.