Long-term response of stream invertebrates to catchment logging
Ely, Damon Thomas
MetadataShow full item record
As part of a long-term study of stream response to whole-catchment logging, we measured secondary production, organic matter standing crops, wood volume, and stormflow seston concentrations in a stream in its twenty-sixth year following whole-catchment logging (BHB) and a nearby reference (HWC). Annual secondary production was only slightly higher in BHB; no differences in habitat-weighted abundance or biomass occurred between streams. Resources were significantly lower in BHB, yet invertebrate biomass per unit organic matter standing crop was higher than the reference. We believe that BHB food quality is higher than HWC despite lower resource quantity, resulting in similar assemblage production between streams. Higher stormflow seston concentrations in BHB indicate less retentive capability, though wood volume did not differ between streams. Differences in food quality and resource retention suggest continued impairment of functional processes in BHB. Care should be taken in judging recovery from disturbance on invertebrate data alone.