Ulster University Logo

Spatial and temporal influences of in-stream factors on the chemistry and epilithic biomasses of upland stream metal deposits

Macintosh, Katrina A and Griffiths, David (2014) Spatial and temporal influences of in-stream factors on the chemistry and epilithic biomasses of upland stream metal deposits. Aquatic Sciences, 76 (3) (pp. 33). [Journal article]

This is the latest version of this item.

Full text not available from this repository.

DOI: doi:10.1007/s00027-014-0338-7

Abstract

The density and composition of stream bed metal deposits are affected by physical, chemical and biological processes. In this paper we investigate the importance of these processes and their relation to algal and non-photosynthetic detrital (NPD) biomass in a set of upland streams in Northern Ireland. Deposit density and Fe, Mn, Al and P concentrations varied with stream pH across sites but not seasonally. No effects of stream bed erosion or photoreduction were detected on deposit densities. Seasonal variation in stream water metal concentrations was correlated with rainfall. NPD biomass was a significant predictor of both spatial and seasonal variation in deposit concentrations. There were strong, non-linear, relations between NPD biomass and deposit metal concentrations, with Fe and Mn becoming relatively more important and algal biomass declining above threshold deposit/NPD densities. The results suggest that NPD biomass influences deposit density and reduces the biomass of photosynthetic autotrophs above a threshold deposit density.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Freshwater Sciences
ID Code:29718
Deposited By: Dr Katrina MacIntosh
Deposited On:11 Jul 2014 12:35
Last Modified:11 Jul 2014 12:35

Available Versions of this Item

Repository Staff Only: item control page