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Habitat complexity mediates the predator-prey space race.

Justine A Smith1, Emiliano Donadio2, Jonathan N Pauli3

  • 1Department of Environmental Science, Policy, and Management, University of California-Berkeley, Berkeley, California, 94720, USA.

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Summary

Habitat structure determines predator-prey dynamics. A joint spatial anchor, where predators and prey share habitat, favors predators like pumas over prey like vicuñas by limiting escape options.

Keywords:
Puma concolorVicugna vicugnaantipredator behaviorhabitat domainhabitat selectionpredator-prey response racespatial anchorutilization distribution

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Wildlife Management

Background:

  • Predator-prey interactions are often viewed as a spatial "space race" driven by behavioral responses.
  • Habitat structure can create spatial anchors, influencing whether predator or prey behaviors dominate.
  • Joint spatial anchors, where predator and prey share feeding habitats, complicate predictions due to conflated risk and reward.

Purpose of the Study:

  • To investigate how habitat distribution influences the predator-prey space race.
  • To test the effect of joint spatial anchors on predator-prey spatial dynamics.
  • To understand the role of habitat heterogeneity in predator-prey space use.

Main Methods:

  • Examined habitat selection and space use correlation between pumas and vicuñas at two sites with differing vegetation distributions.
  • Compared habitat use in a "llano" site with a joint spatial anchor (central meadow) versus a "canyon" site with heterogeneous vegetation.
  • Analyzed puma and vicuña location data in relation to habitat selection and utilization values.

Main Results:

  • Habitat selection and space use were positively correlated between pumas and vicuñas in the llano, but negatively correlated in the canyon.
  • Vicuña locations overlapped more with puma habitat use in the llano than in the canyon.
  • Pumas consistently used cover, while vicuñas avoided vegetation in the heterogeneous canyon, reducing spatial overlap.

Conclusions:

  • A joint spatial anchor, as seen in the llano, favors predators (pumas) by restricting prey (vicuñas) from avoiding critical foraging areas.
  • Habitat distribution significantly shapes predator-prey spatial dynamics, with predictable spatial overlap favoring predators.
  • The outcome of the predator-prey space race is strongly influenced by habitat structure and the resulting predictability of species movements.