Work Description

Title: Body size and predator cues structure variation in defensive displays of Neotropical calico snakes (Oxyrhopus spp.) [dataset] Open Access Deposited

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Methodology
  • All animal-related procedures have been approved by the University of Michigan Institutional Animal Care and Use Committee (Protocols #PRO00006234 and #PRO00008306) and the Peruvian government SERFOR (Servicio Nacional Forestal y de Fauna Silvestre; permit numbers: 029-2016-SERFOR-DGGSPFFS, 405-2016-SERFOR-DGGSPFFS, 116-2017-SERFOR-DGGSPFFS). We collected data from 31 individuals of Oxyrhopus melanogenys and O. petolarius across a wide range of body sizes from Los Amigos Biological Station in the Madre de Dios region of Peru in November 2016, November 2017, and November 2018, and from Villa Carmen Research Station in the Cusco region of Peru in October 2016. We performed all behavioral trials in a standardized portable field arena (55cm x 173cm x 61cm) and filmed with two overhead view cameras and one lateral view camera that were GoPro Hero4+ Black or Hero5+ Black. We exposed snakes to four different treatment types in a randomized order to simulate different predator encounters: pulsed vibration, white overhead looming cue, black overhead looming cue, and tactile stimulus. For each treatment, we exposed the snake to the stimulus for up to 1 minute, with 1 minute rest periods in between trials. We used QuickTime Player 7 to watch videos frame-by-frame and score anti-predator defensive behaviors following the framework described in Davis Rabosky et al. 2021 ( http://dx.doi.org/10.1093/biolinnean/blaa222). This modular approach characterizes snake behavior separately by functional region, thereby capturing any decoupled changes between the head and neck, body, and tail. For each body region, we evaluated behaviors in five categories: Shape, Presentation, Position, Posture, and Movement. We wrote code in R v4.2.3 to analyze and compare the ethograms.
Description
  • In this study, we experimentally tested for the effects of four simulated predator cues on defensive displays in two species of South American calico snakes (genus Oxyrhopus). We found that juvenile snakes were both more likely to respond and to respond more strongly than adults and that displays were most common in response to tactile stimuli than to other treatments. However, we also found broad similarity across both simulated predator treatments and species in the components used in each snake’s defensive display, suggesting a high degree of stereotyping. This research suggests an important role for both ontogeny and intensity of predation risk in structuring variation in defensive behavior in Neotropical snakes and emphasizes the foundational importance of context dependence in conceptual frameworks for understanding predator-prey interactions.

  • *On January 4, 2024, “Supplementary_material.pdf” was replaced with an updated version that has slightly different versions of Figures S4 and S8 after an error in code was corrected. Within “HeatmapFigures.zip,” two code files, “IndividualHeatmaps_matrices.R” and “FigureS4_S8_averagedHeatmaps.R” were updated to correct the code error. Three additional files were added to both the “figures” and “matrices” folders within the subfolder “heatmaps.” These files represent the correlation matrices, by body part, and graphical representation of the matrices for one experimental trial that had previously been excluded due to the code error.
Creator
Creator ORCID
Depositor
  • jglarson@umich.edu
Contact information
Discipline
Funding agency
  • Other Funding Agency
Other Funding agency
  • Packard Foundation

  • University of Michigan
Keyword
Date coverage
  • 2016-11 to 2023-06
Citations to related material
  • Sealey, B.A.*, Larson, J.G.*, Westeen, E.P., Sanchez-Paredes, C.M., Moore, T.Y., Davis Rabosky, A.R. Body size and predator cues structure variation in defensive displays of Neotropical calico snakes (Oxyrhopus spp.). Ethology. In press. *Authors contributed equally
Resource type
Last modified
  • 01/04/2024
Published
  • 12/21/2023
Language
DOI
  • https://doi.org/10.7302/3egy-m932
License
To Cite this Work:
Sealey, B. A., Larson, J. G., Westeen, E. P., Sánchez-Paredes, C. M., Moore, T. Y., Davis Rabosky, A. R. (2023). Body size and predator cues structure variation in defensive displays of Neotropical calico snakes (Oxyrhopus spp.) [dataset] [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/3egy-m932

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Files (Count: 7; Size: 69.2 GB)

Thumbnailthumbnail-column Title Original Upload Last Modified File Size Access Actions
csvs_final.zip 2023-12-20 2023-12-20 107 KB Open Access
Figure2.zip 2023-12-20 2023-12-20 8.35 KB Open Access
PCAFigures.zip 2023-12-20 2023-12-20 18.3 KB Open Access
Supplementary_material.pdf 2023-12-21 2024-01-04 7.04 MB Open Access
HeatmapFigures.zip 2023-12-21 2024-01-04 925 KB Open Access
DataVideos.zip 2023-12-21 2023-12-21 69.2 GB Open Access
OxyrhopusEthologyReadMe_revised4...4.rtf 2024-01-04 2024-01-04 8.87 KB Open Access

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