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Landscape Ecology

, Volume 31, Issue 10, pp 2343–2354 | Cite as

Effects of exurban development on trophic interactions in a desert landscape

  • Kristen A. DaVanon
  • Lindsey K. Howard
  • Karen E. Mabry
  • Robert L. Schooley
  • Brandon T. BestelmeyerEmail author
Research Article

Abstract

Context

Mechanisms of ecosystem change in urbanizing landscapes are poorly understood, especially in exurban areas featuring residential or commercial development set in a matrix of modified and natural vegetation. We asked how development altered trophic interactions and ecosystem processes in the matrix.

Objectives

We examined the effect of varying degrees of exurban development (housing density) on a trophic system that included an apex mammalian predator (coyote, Canis latrans), mammalian herbivores (lagomorphs and rodents), and herbaceous plants. We tested the hypothesis that plant recruitment would be negatively affected by exurban development due either to increases in herbivores associated with increased resource availability (a bottom–up effect) or to a reduction in predators that avoid humans (a top–down effect).

Methods

In Las Cruces, New Mexico, USA, four replicate sites were located in each of three urbanization levels: high density exurban, low density exurban, and wildland dominated by Chihuahuan Desert vegetation. Seedling trays measured herbivory rates, live trapping estimated abundance of pocket mice and kangaroo rats, and remotely-triggered wildlife cameras estimated the activity of lagomorphs and coyotes.

Results

Increased herbivory on seedlings and decreased herbaceous plant recruitment were observed in high density exurban areas. Overall rodent abundance, seed consumption rates, and activity of the lagomorph Lepus californicus did not vary with urbanization level. Activity by another lagomorph, Sylvilagus audubonii, and coyotes was highest in dense exurban areas, consistent with a bottom–up effect.

Conclusions

Exurban development can have important indirect effects on trophic interactions occurring in adjacent, untransformed ecosystems. Similar to earlier studies, such effects in the Chihuahuan Desert may be mediated by bottom–up processes associated with anthropogenic inputs.

Keywords

Chihuahuan Desert Coyote Lagomorph Rodent Plant recruitment Urbanization 

Notes

Acknowledgments

This study was funded by the National Science Foundation through the Jornada Basin LTER site (DEB0080412) and by T&E, Inc. We thank William Gould and Darren James for statistical help and Mark Andersen and Donovan Bailey for suggestions and comments on earlier versions of this work. We also thank Maria Chavez for help in the field. Finally, we thank the Bureau of Land Management for coordinating use of the wildland sites and several Las Cruces residents for allowing us the use of their yards.

Supplementary material

10980_2016_403_MOESM1_ESM.docx (1.3 mb)
Supplementary material 1 (DOCX 1330 kb)

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Copyright information

© Springer Science+Business Media Dordrecht (outside the USA) 2016

Authors and Affiliations

  • Kristen A. DaVanon
    • 1
  • Lindsey K. Howard
    • 1
  • Karen E. Mabry
    • 1
  • Robert L. Schooley
    • 2
  • Brandon T. Bestelmeyer
    • 3
    Email author
  1. 1.Department of BiologyNew Mexico State UniversityLas CrucesUSA
  2. 2.Department of Natural Resources and Environmental SciencesUniversity of IllinoisUrbanaUSA
  3. 3.Jornada Experimental RangeUSDA Agricultural Research ServiceLas CrucesUSA

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