Pregled bibliografske jedinice broj: 204834
The Influence of Hyporheic-Surface Water Exchange on the Spatial Distribution of Benthic Algal Biomass and Community Composition in an Alluvial River.
The Influence of Hyporheic-Surface Water Exchange on the Spatial Distribution of Benthic Algal Biomass and Community Composition in an Alluvial River. // NABS 53rd Annual Meeting Supplement to Eos, Transactions, American Geophysical Union (ISSN 0096-3941) Vol. 86, No. 18
Washington (MD): The American Geophysical Union, 2005. str. (B23A-05) 63 (predavanje, međunarodna recenzija, sažetak, znanstveni)
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Naslov
The Influence of Hyporheic-Surface Water Exchange on the Spatial Distribution of Benthic Algal Biomass and Community Composition in an Alluvial River.
Autori
Wyatt, Kevin H. ; Hauer, Richard F. ; Pessoney, George F. ; Gligora, Marija
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
NABS 53rd Annual Meeting Supplement to Eos, Transactions, American Geophysical Union (ISSN 0096-3941) Vol. 86, No. 18
/ - Washington (MD) : The American Geophysical Union, 2005, (B23A-05) 63
Skup
NABS 53rd Annual Meeting
Mjesto i datum
New Orleans (LA), Sjedinjene Američke Države, 22.05.2005. - 27.05.2005
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
hyporheic-surface water interactions; algal assemblages; periphyton
Sažetak
We investigated the influence of hyporheic-surface water interactions on the spatial distribution of benthic algal biomass and community composition in the main-channel of the Middle Fork Flathead River in northwestern Montana. We examined hyporheic-surface water exchange at 120 randomly selected sites by measuring vertical hydraulic gradients (VHG) and hydraulic conductivities using metal piezometers. At each replicate site, we collected algae from a single cobble to analyze chlorophyll a concentration and estimate algal density and community composition. We used Non-metric Multidimensional Scaling (MDS) based on the Bray-Curtis Index of Similarity to evaluate the response of benthic algal communities to hyporheic-surface water exchange. Algal communities at upwelling (+VHG) and downwelling (-VHG) sites occupied discrete regions of ordination space created by the MDS. Algal communities at upwelling sites were dominated by the genus Stigeoclonium or Hydrurus, whereas communities at downwelling sites were dominated by the genus Achnanthidium. There was a statistically significant positive correlation between benthic algal biomass and hyporheic upwelling. The preliminary results of our study suggest that hyporheic-surface water exchange regimes influence the spatial distribution of benthic algal biomass and community composition in large alluvial rivers.
Izvorni jezik
Engleski
Znanstvena područja
Biologija
