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Asymmetric interference competition and niche partitioning between native and invasive Anolis lizards

Abstract

Species can compete both directly via aggressive encounters (interference) and indirectly through their shared use of a limited resource (exploitation). Depending on the circumstances interference, exploitation, and their interplay can either lead to competitive exclusion or drive niche partitioning to maintain species coexistence. Thus, understanding species coexistence in nature requires accurately identifying the mechanisms that contribute to competition among the species in question. In the southern United States, the native lizard Anolis carolinensis becomes more arboreal in the presence of the invasive Anolis sagrei, resulting in highly consistent vertical habitat partitioning where the species co-occur. These species have been thought to largely ignore each other and engage only in exploitative competition for shared arthropod prey. To test for the presence and consequences of direct interference, we conducted behavioral trials in the field, introducing a heterospecific male intruder to individuals of both species. We find that interference competition is asymmetric in favor of A. sagrei, which are more likely to display and less likely to retreat than A. carolinensis. Concordant with their arboreal tendencies, male A. carolinensis also trend toward retreating upward more often than expected by chance. These asymmetries are prevalent despite the almost complete absence of physical attacks, suggesting that interspecific signaling and avoidance behavior by A. carolinensis resolve most potential conflicts before they escalate to combat. Our results highlight the potential for direct interference more subtle than frequent outright combat to structure communities, and Anolis assemblages in particular.

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Acknowledgements

This work would not have been possible without the logistical and intellectual support provided by Irene Arpayoglou and staff at the Indian River Lagoon Aquatic Preserve. We thank Carol Herzog, Dylan Gavagni, and staff at the St. Sebastian River Preserve for providing lodging. We also thank Jonathan Losos, Ambika Kamath, and Elizabeth Wolkovich for providing helpful feedback on the manuscript.

Funding

This study was generously funded by the Harvard Museum of Comparative Zoology, Harvard Center for the Environment, and Harvard College Research Program.

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Authors

Contributions

NCH conceived the study. KAC analyzed videos. KAC and NCH jointly designed the experiment, conducted fieldwork, analyzed data, constructed figures, and wrote the manuscript.

Corresponding author

Correspondence to Nicholas C. Herrmann.

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All applicable institutional and national guidelines for the care and use of animals were followed.

Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Communicated by Lin Schwarzkopf.

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Culbertson, K.A., Herrmann, N.C. Asymmetric interference competition and niche partitioning between native and invasive Anolis lizards. Oecologia 190, 811–820 (2019). https://doi.org/10.1007/s00442-019-04466-1

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  • DOI: https://doi.org/10.1007/s00442-019-04466-1

Keywords

  • Behavior
  • Interspecific aggression
  • Habitat partitioning
  • Tethered intruder
  • Florida