HR: 14:45h
AN: NB23B-06 [Abstracts]
TI: Macroinvertebrate Response to Drought in Undisturbed Headwater Streams of Southwest Georgia.
AU: * Winn, R T
EM: rebecca.winn@ipaper.com
AF: International Paper, 719 Southlands Road, Bainbridge, GA 39819 United States
AU: Griswold, M W
EM: marcgris@ufl.edu
AF: Howard T. Odum Center for Wetlands, University of Florida
P.O. Box 116350, Gainesville, FL 32611 United States
AU: Golladay, S W
EM: sgollada@jonesctr.org
AF: J. W. Jones Ecological Research Center at Ichauway, Rte 2, Box 2324, Newton, GA 39870 United States
AU: Crisman, T L
EM: tcris@eng.ufl.edu
AF: Howard T. Odum Center for Wetlands, University of Florida
P.O. Box 116350, Gainesville, FL 32611 United States
AB:
Macroinvertebrates were sampled in four headwater streams for two years (2001-2003) to establish baseline conditions for a
study evaluating forestry best management practices. The Palmer Drought Severity Index indicated that the study site
experienced a prolonged moderate to severe drought prior to study initiation, with year one of the study characterized as a
moderate drought, while year two encompassed drought and initial rainfall recovery. Benthic macroinvertebrates were
collected in streams during year one (December 2001/February 2002) and year two (December 2002/February 2003) using a
multi-habitat sampling procedure. Individuals were identified to the lowest practical taxonomic level (mostly genus), and
metrics including abundance, total number of taxa, and Ephemeroptera, Plecoptera, and Trichoptera (EPT) taxa were calculated. Repeated measures ANOVA identified differences in macroinvertebrate assemblages due to sampling period, with lower values
for December 2001 relative to February 2003. Abundance and EPT taxa showed an increasing relationship with average daily flow in successive samples of the study. Initiation of drought conditions prior to the study adversely affected species
composition (low numbers of EPT taxa and long lived taxa) and trophic structure (co-dominance of shredders, collectors, and
predators).
DE: 1800 HYDROLOGY
DE: 1812 Drought
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly