Abstract
Despite the mandate of the Clean Water Act to protectthe physical, chemical, and biological integrity ofthe USA's wetlands, the use of biota to assess wetlandcondition has not been well explored. During June,1996, we evaluated the response of macroinvertebrateassemblages to fill-culvert highway crossings in twobottomland forested wetlands in North Carolina. Ourobjective was to apply biological assessment methodsand metrics that have been effectively used in streamsto explore their applicability in forested wetlands.We found significant changes in several metrics as afunction of distance from the highway crossings. Arealand numerical taxon richness increased within at least40 m of highway when compared to control locations.Percent dominant taxon values were lowest within 10 mof the highway. Percent herbivores also increasedsignificantly within at least 40 m of the highway,reflecting the lower % crown closure and associatedshift in primary production from trees to herbaceousmacrophytes and algae. The North Carolina BioticIndex, a metric of tolerance, did not reflectassemblage changes near the highway. Ordination andpermutation tests revealed that assemblage compositionwas significantly different from controls at 10 and 40 mdistances from the highway crossings. In particular,algal grazers such as the mayflies Caenissp.and Callibaetissp. responded positively and thedamselflies Ischnuraspp. and the fingernailclams Sphaeriumspp. responded negatively to thecrossings. Favorable algal and herbaceous detritalresources, greater patchiness and habitat complexity,and overall high tolerance to natural stressorsprobably contributed to the increase in taxon richnessnear the highway. However, significant deviation fromcontrol locations indicated the highway was a sourceof perturbation. Our findings illustrate the potentialutility of macroinvertebrate assemblages for wetlandassessment, but suggest the importance of defining thereference condition as well as the need fordevelopment of metrics for specific classes ofwetlands.
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King, R., Nunnery, K. & Richardson, C. Macroinvertebrate assemblage response to highway crossings in forested wetlands: implications for biological assessment. Wetlands Ecology and Management 8, 243–256 (2000). https://doi.org/10.1023/A:1008479316066
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DOI: https://doi.org/10.1023/A:1008479316066