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Plant Ecology

, Volume 220, Issue 4–5, pp 523–528 | Cite as

Vertebrate herbivory on shrub seedlings in California sage scrub: important but understudied interactions

  • John Litle
  • Lauren H. Quon
  • Marlee L. Antill
  • Erin J. Questad
  • Wallace M. MeyerIIIEmail author
Article

Abstract

Herbivory is poorly characterized in the endangered California sage scrub ecosystem, because previous studies were conducted only in winter and spring. To better understand vertebrate herbivore impacts, we first examined if and when vertebrate herbivores influence Artemisia californica seedling survivorship by examining differences in mortality between caged and uncaged seedlings. Then, we examined: (1) vertebrate herbivore preference of common sage scrub shrub species, and (2) which vertebrate species constitute important herbivores in the ecosystem. We found that mortality for uncaged A. californica seedlings was twice that of caged seedlings, and occurred in the summer and early fall, when previous studies in the system were not conducted. Short leaved shrubs, Artemisia californica and Eriogonum fasciculatum, were more susceptible to herbivory than broader leaved Salvia apiana and Eriodictyon trichocalyx. However, susceptibility likely depends on the herbivore assemblage, as the three main herbivore species [Sylvilagus audubonii (desert cottontail), Zonotrichia leucophrys (white-crowned sparrow; a bird, not a mammal), and Otospermophilus beecheyi (California gray squirrel)] all had different shrub preferences. Our results contrast with previous studies that suggests that native vertebrate herbivores facilitate shrub seedling survivorship by highlighting that late-season vertebrate herbivory may negatively affect shrub seedling survivorship. We demonstrate the complex but understudied role herbivores play in the sage scrub ecosystem, and highlight that further study of these key ecological interactions is warranted.

Keywords

Mammal Bird Species interactions Plant community Top-down Preference 

Notes

Acknowledgements

We thank the Pomona College Biology Department and the Henry David Thoreau Foundation for funding.

References

  1. Bartholomew B (1970) Bare zone between California shrub and grassland communities: the role of animals. Science 170:1210–1212CrossRefGoogle Scholar
  2. Bates D, Maechler M, Bolker B, Walker S (2015) Fitting linear mixed-effects models using lme4. J Stat Softw 67:1–48CrossRefGoogle Scholar
  3. Caspi T, Estrada L, Dowling AV, Su E, Leshchinskiy M, Calvalcanti ARO, Crane EJ III, Robins CR, Meyer WM III (2018) Carbon and nitrogen storage in the topsoils of Inceptisols and Mollisols under native sage scrub and non-native grasslands in southern California. Geoderma Reg 14:e00172CrossRefGoogle Scholar
  4. Chapman JA, Willner GR (1978) Sylvilagus audubonii. Mamm Species 106:1–4Google Scholar
  5. Coley PD, Bryant JP, Chapin FS (1985) Resource availability and plant antiherbivore defense. Science 230:895–899CrossRefGoogle Scholar
  6. Cox RD, Allen EB (2011) The roles of exotic grasses and forbs when restoring native species to highly invaded southern California annual grassland. Plant Ecol 212:1699CrossRefGoogle Scholar
  7. DeSimone SA, Zedler PH (1999) Shrub seedling recruitment in unburned Californian coastal sage scrub and adjacent grassland. Ecology 80:2018–2032CrossRefGoogle Scholar
  8. Halligan JP (1973) Bare areas associated with shrub stands in grasslands: the case of Artemisia californica. Bioscience 23:429–432CrossRefGoogle Scholar
  9. Keeley JE, Syphard AD (2016) Climate change and future fire regimes: examples from California. Geosciences 6:37CrossRefGoogle Scholar
  10. Kimball S, Goulden ML, Suding KN, Parker S (2014) Altered water and nitrogen input shifts succession in a southern California coastal sage community. Ecol Appl 24:1390–1404CrossRefGoogle Scholar
  11. Krebs CJ (1998) Ecological methodology, 2nd edn. Addison Wesley Educational Publishers, Menlo ParkGoogle Scholar
  12. Kuznetsova A, Brockhoff PB, Christensen RHB (2017) lmerTest package: tests in linear mixed effects models. J Stat Softw 82(13):1–26CrossRefGoogle Scholar
  13. Mills JN (1983) Herbivory and seedling establishment in post-fire southern California chaparral. Oecologia 60:267–270CrossRefGoogle Scholar
  14. Mills JN (1986) Herbivores and early postfire succession in southern California chaparral. Ecology 67:1637–1649CrossRefGoogle Scholar
  15. Moreno JM, Oechel WC (1991) Fire intensity and herbivory effects on postfire resprouting of Adenostoma fasciculatum in southern California chaparral. Oecologia 85:429–433CrossRefGoogle Scholar
  16. Muller CH, Muller WH, Haines BL (1964) Volatile growth inhibitors produced by aromatic shrubs. Science 143:471–473CrossRefGoogle Scholar
  17. Muller CH, del Moral R, Bartholomew B (1971) Role of animals in suppression of herbs by shrubs. Science 173:462–463CrossRefGoogle Scholar
  18. Quinn RD (1986) Mammalian herbivory and resilience in mediterranean-climate ecosystems. In: Dell B, Hopkins AJM, Lamont BB (eds) Resilience in mediterranean-type ecosystems. Springer, Dordrecht, pp 113–128CrossRefGoogle Scholar
  19. R Core Team (2018) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. https://www.R-project.org/ Google Scholar
  20. Riordan EC, Rundel PW (2014) Land use compounds habitat losses under projected climate change in a threatened California ecosystem. PLoS ONE 9:e86487CrossRefGoogle Scholar
  21. Rundel PW (2007) Sage scrub. In: Barbour M, Keeler-Wold T, Schoenherr AA (eds) Terrestrial vegetation of California. University of California Press, Berkeley, pp 208–228CrossRefGoogle Scholar
  22. Staubus WJ, Boyd ES, Adams TA, Spear DM, Dipman MM, Meyer WM III (2015) Ant communities in native sage scrub, non-native grassland, and suburban habitats in Los Angeles County, USA: conservation implications. J Insect Conserv 19:669–680CrossRefGoogle Scholar
  23. Talluto MV, Suding KN (2008) Historical change in coastal sage scrub in southern California, USA in relation to fire frequency and air pollution. Landsc Ecol 23:803–815CrossRefGoogle Scholar
  24. Waterton J, Cleland EE (2016) Trade-off between early emergence and herbivore susceptibility mediates exotic success in an experimental California plant community. Ecol Evol 6:8942–8953CrossRefGoogle Scholar
  25. Westman WE (1981) Factors influencing the distribution of species of Californian coastal sage scrub. Ecology 62:439–455CrossRefGoogle Scholar
  26. Wheeler MM, Dipman MM, Adams TA, Runia AV, Robins CR, Meyer WM III (2016) Carbon and nitrogen storage in California sage scrub and non-native grasslands. J Arid Ecosyst 129:119–125Google Scholar

Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Biology DepartmentPomona CollegeClaremontUSA
  2. 2.Biological Sciences DepartmentCalifornia State Polytechnic University, PomonaPomonaUSA

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