Channel stability and the structure of coastal stream aquatic insect assemblages
Document Type
Article
Publication Date
7-5-2016
Abstract
Human population growth in coastal areas will be accompanied by increasing stress on the low-gradient, fine-substrate streams that often characterize lowland watersheds. Although assessment of anthropogenic influences on these streams is of increasing importance, research on habitat-biota relationships in coastal plain streams has lagged behind research efforts in upland systems. In particular, channel stability and its relationships with stream biota has received little attention, although anthropogenic influences on channel stability from land use changes are well-documented in other systems. We assessed the influence of channel stability and physicochemical stream characteristics on the density, diversity, evenness, and % Ephemeroptera, Plecoptera, and Trichoptera (EPT) of aquatic insect assemblages in sand-substrate coastal plain streams in the Gulf of Mexico, southeastern USA. Of 26 stream habitat and water quality characteristics, 23 were associated with the integrated metric of the Pfankuch stability index (PSI). Additionally, the PSI was significantly related to insect density, diversity, evenness, and % EPT. The PSI was also related to densities of the 17 most abundant insect taxa, including the mayfly Stenonema and adult and larval elmid beetles Ancyronyx and Stenelmis, which occurred at higher abundances in less stable streams, and Hydropsyche caddisfly larvae, which were more abundant in more stable streams. Despite the instability of sand-substrate coastal plain stream channels, the PSI distinguished among study streams. We suggest this index as appropriate for use as a physical habitat and biological assessment tool in lowland coastal streams.
Publication Source (Journal or Book title)
Fundamental and Applied Limnology
First Page
187
Last Page
199
Recommended Citation
Markos, P., Kaller, M., & Kelso, W. (2016). Channel stability and the structure of coastal stream aquatic insect assemblages. Fundamental and Applied Limnology, 188 (3), 187-199. https://doi.org/10.1127/fal/2016/0865