NDLI: Evidence for mild sediment Pb contamination affecting leaf-litter decomposition in a lake.

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Evidence for mild sediment Pb contamination affecting leaf-litter decomposition in a lake.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Oguma, Andrew Y. Klerks, Paul L.
Spatial Coverage	Texas
Description	Author Affiliation: Oguma AY ( Department of Biology, University of Louisiana at Lafayette, P.O. Box 42451, Lafayette, LA, 70504, USA, andy.oguma@gmail.com.)
Abstract	Much work has focused on the effects of metal-contaminated sediment on benthic community structure, but effects on ecosystem functions have received far less attention. Decomposition has been widely used as an integrating metric of ecosystem function in lotic systems, but not for lentic ones. We assessed the relationship between low-level sediment lead (Pb) contamination and leaf-litter decomposition in a lentic system. We measured 30-day weight loss in 30 litter-bags that were deployed along a Pb-contamination gradient in a cypress-forested lake. At each deployment site we also quantified macrobenthos abundance, dissolved oxygen, water depth, sediment organic content, sediment silt/clay content, and both total sediment and porewater concentrations of Cd, Cu, Ni, Pb and Zn. Principal components (PC) analysis revealed a negative relationship between Pb concentration and benthic macroinvertebrate abundance, and this covariation dominated the first PC axis (PC1). Subsequent correlation analyses revealed a negative relationship between PC1 and percent leaf-litter loss. Our results indicate that leaf-litter decomposition was related to sediment Pb and benthic macroinvertebrate abundance. They also showed that ecosystem function may be affected even where sediment Pb concentrations are mostly below threshold-effects sediment quality guidelines--a finding with potential implications for sediment risk assessment. Additionally, the litter-bag technique used in this study showed promise as a tool in risk assessments of metal-contaminated sediments in lentic systems.
File Format	HTM / HTML
ISSN	09639292
Issue Number	6
Volume Number	24
e-ISSN	15733017
Journal	Ecotoxicology
Language	English
Publisher	Springer
Publisher Date	2015-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ecology Discipline Environmental Health Discipline Toxicology Geologic Sediments Analysis Lakes Chemistry Lead Plant Leaves Water Pollutants, Chemical Environmental Monitoring Texas Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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