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Costs of territoriality: a review of hypotheses, meta-analysis, and field study

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Abstract

The evolution of territoriality reflects the balance between the benefit and cost of monopolising a resource. While the benefit of territoriality is generally intuitive (improved access to resources), our understanding of its cost is less clear. This paper combines: 1. a review of hypotheses and meta-analytic benchmarking of costs across diverse taxa; and 2. a new empirical test of hypotheses using a longitudinal study of free-living male territorial lizards. The cost of territoriality was best described as a culmination of multiple factors, but especially costs resulting from the time required to maintain a territory (identified by the meta-analysis) or those exacerbated by a territory that is large in size (identified by the empirical test). The meta-analysis showed that physiological costs such as energetic expenditure or stress were largely negligible in impact on territory holders. Species that used territories to monopolise access to mates appeared to incur the greatest costs, whereas those defending food resources experienced the least. The single largest gap in our current understanding revealed by the literature review is the potential cost associated with increased predation. There is also a clear need for multiple costs to be evaluated concurrently in a single species. The empirical component of this study showcases a powerful analytical framework for evaluating a range of hypotheses using correlational data obtained in the field. More broadly, this paper highlights key factors that should be considered in any investigation that attempts to account for the evolutionary origin or ecological variation in territorial behaviour within and between species.

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taken from associated path models (Table 4; see also Figure S4)

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Availability of data and materials

All data associated with this study is publicly available through the Dryad digital data repository (https://doi.org/10.5061/dryad.r7sqv9sd1).

Code availability

All code associated with this study is available from the author (t.ord@unsw.edu.au).

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Acknowledgements

I am especially grateful to Grace Charles and Meredith Palmer for their assistance in the field on the original longitudinal study of A. gundlachi territorial behaviour, and C. Tucker Pforzheimer for his tireless efforts in creating the detailed territorial maps. Three anonymous reviewers provided many thoughtfully points that prompted extensive revisions and new analyses being included that greatly improved this paper. The empirical work outlined in this paper was approved by research permits from the Caribbean National Forest and Department of Natural Resources and Environment of Puerto Rico.

Funding

The longitudinal study described in this paper was supported by a grant from the National Science Foundation (IOB-0517041/0516998).

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TJO conceived, designed, and executed the study and wrote the manuscript. No other person is entitled to authorship.

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Correspondence to Terry J. Ord.

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There are no conflicts or competing interests associated with this work.

Ethics approval

The empirical work outlined in this paper was covered under Animal Use and Care Protocols 05-11652/15243 from the Institutional Animal Care and Use Committee of the University of California at Davis.

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Additional information

Communicated by Jean-François Le Galliard.

Supplementary Information

Below is the link to the electronic supplementary material.

Fig. S1

PRISMA flow diagram outlining the approach of reviewing and screening literature for summarising hypotheses previously investigated by empirical investigations of territorial costs and benchmarking those hypotheses using standardised effect size analysis (i.e. meta-analysis). Supplementary file1 (PPTX 45 KB)

Fig. S2

An example map of a male A. gundlachi lizard territory showing estimated territory size (in red) and perches used during the study. Neighbour positions were inferred by compass bearing and distance from the central perch.. Supplementary file2 (EPS 2022 KB)

Fig. S3

The (a) estimated population growth rate of male A. gundlachi at the study location used to compute changes in body condition (the residual value estimated for a male at the start of the study subtracted from the residual value estimated for that same male at the end of the study). Males (b) in better condition at the start of the study were typically those with the largest territories. Supplementary file3 (XLSX 21 KB)

Fig. S4

The range of plausible path models that might account for changes in body condition of male A. gundlachi lizards depending on the hypothesis supported (see Figure 1). Alternative models within hypotheses are grouped by arrow colour.. Supplementary file4 (PPTX 44 KB)

Fig. S5

Effect sizes and study degrees of freedom for the range of species included in the meta-analysis. Supplementary file5 (EPS 2341 KB)

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Ord, T.J. Costs of territoriality: a review of hypotheses, meta-analysis, and field study. Oecologia 197, 615–631 (2021). https://doi.org/10.1007/s00442-021-05068-6

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