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Journal of Chemical Ecology

, Volume 40, Issue 10, pp 1135–1145 | Cite as

Aspen (Populus tremuloides Michx.) Intake and Preference by Mammalian Herbivores: The Role of Plant Secondary Compounds and Nutritional Context

  • Juan J. VillalbaEmail author
  • Elizabeth A. Burritt
  • Samuel B. St. Clair
Article

Abstract

Aspen (Populus tremuloides Michx.) has evolved a chemical defense system comprised of phenolic glycosides (PG), which effectively deter insect herbivory. However, much less is known about the role of PG and the nutritional quality of the associated plant community on aspen browse susceptibility to mammalian herbivores. In three successive periods during the growing season, we conducted experiments with sheep by offering leaves from two aspen stands with different concentrations of PG (LOW, HIGH) or aspen leaves vs. leaves from a forb (Utah pea, Lathyrus pauciflorus) or a grass (smooth brome, Bromus inermis Leyss.) growing in an aspen understory. Intake of aspen (19 to 35 % PG) was low in all periods (1 to 6 g/Kg0.75 in 2 hr) supporting the notion that aspen’s defense system may contribute to its ecological success. However, lambs ate larger amounts of LOW than of HIGH suggesting that sheep could discriminate between aspen stands with different concentrations of PG, even when both stands were relatively well defended. Concentration of nutrients and chemical defenses in aspen leaves remained fairly stable across the growing season, and preference for aspen increased over the growing season. In contrast, preference for the forb and the grass decreased across the growing season in concert with a decline in the nutritional quality of these plants. The data suggest that nutritional context of aspen and associated forage species drove preference more than contrasts in defense chemistry of aspen. There may be periods of “susceptibility” of aspen use by mammalian herbivores, despite high concentrations of chemical defenses, which can potentially be targeted by management to reduce aspen herbivory.

Keywords

Herbivory Phenolic glycosides Condensed tannins Ovis aries Plant secondary compounds foraging 

Notes

Acknowledgments

Research was supported by grants from the Utah Agricultural Experiment Station, Utah Cooperative Extension and the Utah Division of Wildlife Resources. This paper is published with the approval of the Director, Utah Agricultural Experiment Station, and Utah State University, as journal paper number 8658. We thank the US Forest Service for allowing us collect plant material at the Uintah/Wasatch/Cache National Forest. We also thank A. E. Hagerman and two anonymous referees for helpful comments and suggestions that improved this manuscript. We acknowledge T. Lisonbee, R. Cabassu, V. Egea, Shay Hunt, Tyson Grisenti, and Gavin Johnson for technical support.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Juan J. Villalba
    • 1
    Email author
  • Elizabeth A. Burritt
    • 1
  • Samuel B. St. Clair
    • 2
  1. 1.Department of Wildland ResourcesUtah State UniversityLoganUSA
  2. 2.Deptartment of Plant & Wildlife SciencesBrigham Young UniversityProvoUSA

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