Abstract
Exploitation of forests for biofuel results in variable amounts of fine woody debris (FWD) being left on the forest floor. Such practices have the potential to affect the diversity and taxonomic composition of litter-dwelling organisms. The ability to predict the consequences of harvesting biofuel will be strengthened by knowledge of how variation in FWD affects litter organisms in non-harvested forests. A field experiment with three treatments [Control (no manipulation), FWD Removal, and FWD Addition] was carried out in replicated open plots in an unexploited forest in order to determine how the amount of fallen FWD affects the abundance, diversity and community composition of spiders, selected because of their importance as predators in the leaf-litter food web. Manipulation of FWD started in August, and by the following July total spider density in the FWD Addition treatment was 1.6× that of FWD Removal plots. Spider density in FWD Removal plots was 30% lower than the Control treatment, with no statistically significant difference between Control and FWD Addition. Manipulating FWD had no statistically significant effects on standard indices of spider diversity. However, multivariate community-level analyses revealed statistically significant differences in spider community structure between the FWD Removal and FWD Addition treatments. Two dominant genera of web builders contributed the most to this effect of manipulating FWD. Our results, and the findings of studies of woody debris in younger forests, suggest that the relatively small effects of FWD in our field experiment may reflect the age of the forest, with effects on the fauna likely being larger in forests younger than the one we studied.
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Acknowledgments
The first author was supported by a grant from the Spanish Ministry of Education and Science. The research was also supported by the Kentucky Agricultural Experiment Station and the Department of Entomology, University of Kentucky; and US National Science Foundation Grant DEB-0735236 to DHW. Berea College generously gave us permission to use the Berea College Forest for the experiment, and the Berea College Forester, John Perry, provided assistance throughout the project. Aintzane Barriuso helped in the field and also made a major contribution by counting the Collembola in our samples. Additional assistance, either in the field or with helpful suggestions on the research, was provided by Klaus Birkhoffer, Mark Bostrom, James Harwood, Erin Hladilek, Janet Lensing, Alvaro Romero, Susan Romero and Marzena Stanska.
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Castro, A., Wise, D.H. Influence of fine woody debris on spider diversity and community structure in forest leaf litter. Biodivers Conserv 18, 3705–3731 (2009). https://doi.org/10.1007/s10531-009-9674-7
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DOI: https://doi.org/10.1007/s10531-009-9674-7