Abstract
Research on natural enemies demonstrates the potential for exotic plants to be integrated into foodwebs through the activities of native herbivores. The quantitative importance of exotics as a food resource to herbivores is more difficult to ascertain. In addition, some widespread invaders appear to have minimal herbivore loads. Microstegium vimineum is one example. It is an annual, C4 grass that invades forest understories and is widespread across the eastern US. Its invasion alters the structure and composition of forests. We sampled invertebrates in a tree-canopy gap and under canopy area, and used the unique carbon isotope value of M. vimineum to estimate the quantitative importance of the invader as a food resource relative to native plants. Seven of the eight invertebrate species derived on average >35% of their biomass carbon from M. vimineum, and some individuals representing both ‘chewing’ and ‘sucking’ feeding guilds derived their biomass carbon exclusively from M. vimineum. Our results show that M. vimineum can be a significant food resource for a multi-species, multi-guild, assemblage of native, invertebrate herbivores. Future work is required to assess whether M. vimineum is acquiring herbivores in other parts of its introduced range, and if so what might be the ecological consequences.
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References
Baiser B, Lockwood JL, La Puma D, Aronson MFJ (2008) A perfect storm: two ecosystem engineers interact to degrade deciduous forests of New Jersey. Biol Invasions 10:785–795. doi:10.1007/s10530-008-9247-9
Belote RT, Weltzin JF (2006) Interactions between two co-dominant, invasive plants in the understory of a temperate deciduous forest. Biol Invasions 8:1629–1641. doi:10.1007/s10530-005-3932-8
Civitello DJ, Flory SL, Clay K (2008) Exotic grass invasion reduces survival of Amblyomma americanum and Dermacentor variabilis ticks (Acari: Ixodidae). J Med Entomol 45:867–872. doi:10.1603/0022-2585(2008)45[867:EGIRSO]2.0.CO;2
Fry B (2006) Stable Isotope Ecology. Springer, New York, p 308
Kourtev PS, Ehrenfield JG, Häggblom M (2002) Exotic plant species alter the microbial community structure and function in the soil. Ecology 83:3152–3166
Morrison JA, Lubchansky HA, Mauck KE, McCartney KM, Dunn B (2007) Ecological comparison of two co-invasive species in eastern deciduous forests: Alliaria petiolata and Microstegium vimineum. J Torrey Bot Soc 134:1–17. doi:10.3159/1095-5674(2007)134[1:ECOTCS]2.0.CO;2
Oswalt CM, Oswalt SN, Clatterbuck WK (2007) Effects of Microstegium vimineum (Trin.) A. Camus on native woody species density and diversity in a productive mixed-hardwood forest in Tennessee. For Ecol Manage 242:727–732. doi:10.1016/j.foreco.2007.02.008
Sanders NJ, Belote RT, Weltzin JF (2004) Multitrophic effects of elevated atmospheric CO2 on understory plant and arthropod communities. Environ Entomol 33:1609–1616
Vidra RL, Shear TH, Wentworth TR (2006) Testing the paradigms of exotic species invasion in urban riparian forests. Nat Areas J 26:339–350. doi:10.3375/0885-8608(2006)26[339:TTPOES]2.0.CO;2
Webster CR, Rock JH, Froese RE, Jenkins MA (2008) Drought-herbivory interaction disrupts competitive displacement of native plants by Microstegium vimineum, 10-year results. Oecologia 157:497–508. doi:10.1007/s00442-008-1085-z
Acknowledgments
This research was supported by National Science Foundation funding to Coweeta LTER. Tom Maddox in the Odum School of Ecology performed isotope analyses.
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Bradford, M.A., DeVore, J.L., Maerz, J.C. et al. Native, insect herbivore communities derive a significant proportion of their carbon from a widespread invader of forest understories. Biol Invasions 12, 721–724 (2010). https://doi.org/10.1007/s10530-009-9480-x
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DOI: https://doi.org/10.1007/s10530-009-9480-x