NDLI: Changes in epilithic biomasses and invertebrate community structure over a deposit metal concentration gradient in upland headwater streams

Content Provider	Springer Nature Link
Author	Macintosh, Katrina Ann Griffiths, David
Copyright Year	2015
Abstract	Stream bed metal deposits affect the taxon richness, density and taxonomic diversity of primary and secondary producers by a variety of direct or indirect abiotic and biotic processes but little is known about the relative importance of these processes over a deposit metal concentration gradient. Inorganic matter (IM), algal and non-photosynthetic detrital (NPD) dry biomasses were estimated for 10 monthly samples, between 2007 and 2008, from eight sites differing in deposit density. Invertebrate abundance, taxon richness and composition were also determined. Relations between these variables were investigated by canonical correspondence analysis (CCA), generalized estimating equation models and path analysis. The first CCA axis correlates with deposit density and invertebrate abundance, with lumbriculids and chironomids increasing in abundance with deposit density and all other taxa declining. Community structure changes significantly above a deposit density of approximately 8 mg cm−2, when algal biomass, invertebrate richness and diversity decline. Invertebrate richness and diversity were determined by direct effects of NPD biomass and indirect effects of IM. Algal biomass only had an effect on invertebrate abundance. Possible pH, oxygen, food and ecotoxicological effects of NPD biomass on the biota are discussed.
Starting Page	159
Ending Page	169
Page Count	11
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	760
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-05-24
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metal deposits Invertebrate richness and composition Algal biomass Non-photosynthetic detrital biomass Direct and indirect pathways Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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