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Resource complementation and the response of an insect herbivore to habitat area and fragmentation

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Abstract

Few studies have disentangled the effects of the area and fragmentation of a focal habitat type on species that use multiple habitat types within a landscape. We experimentally investigated the effects of habitat area, habitat fragmentation, and matrix composition on the movement and distribution of Melanoplus femurrubrum. Adults of this grasshopper feed preferentially on grasses, but oviposit almost exclusively in soil dominated by forbs. We compared population densities among plots that were made to vary in the area and fragmentation of clover habitat and composition of the matrix (grass or bare ground) within which clover habitat was embedded. In addition, a mark-recapture survey was conducted to examine effects of habitat area, fragmentation, and matrix composition on loss of individuals from a plot’s clover habitat and movement between clover subplots within plots. Overall densities of adult M. femurrubrum (averaged over clover and matrix) were 2.2× higher in plots where the matrix was composed of grass as compared to bare ground, and 1.8× higher in plots with 64 compared to 16 m2 of clover habitat. Overall densities of nymphs were also positively influenced by greater clover area, but were unaffected by matrix composition. Within focal clover habitat embedded in grass matrix, adult densities were 2.1× higher in small clover subplots than large clover subplots. We conclude that the grass matrix had a positive effect on adult densities, but not nymph densities, because grass and forb-dominated habitats likely provide complementary resources only for adults. The aggregation of adults on small clover subplots within grass matrix was mainly attributed to a greater rate of emigration loss per unit area. In addition, this study emphasizes that a species’ response to changes in the area of a focal habitat type can depend significantly on the availability of complementary resources in the surrounding landscape.

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Acknowledgments

We thank Juanita Constible, Rodney Kolb, Doug Mazeffa, Mark Munier, Ryan Stander, and Dave Stasek for their help in the field. Juanita Constible, Oswald Schmitz, and two anonymous reviewers provided valuable comments on an earlier draft of this manuscript. Funding was provided by Miami University, a Miami University Postdoctoral Research Scholarship, a German Research Foundation (DFG) grant (DI 1207/1-1), and a grant from the National Science Foundation (DEB-0235369).

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Correspondence to Kyle J. Haynes.

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Communicated by Oswald Schmitz.

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Haynes, K.J., Diekötter, T. & Crist, T.O. Resource complementation and the response of an insect herbivore to habitat area and fragmentation. Oecologia 153, 511–520 (2007). https://doi.org/10.1007/s00442-007-0749-4

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