Related Experiment Video
Updated: Jun 4, 2026

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
Published on: November 13, 2017
Lead levels in Eurasian otters decline with time and reveal interactions between sources, prevailing weather, and
Elizabeth A Chadwick1, Victor R Simpson, Abigail E L Nicholls
1Cardiff University School of Biosciences, Museum Avenue, Cardiff CF10 3AX, UK. ChadwickEA@cardiff.ac.uk
Abstract:
The uptake of contaminants by biota varies spatially and temporally due to a complex range of interacting environmental variables, but such complexities are typically disregarded in studies of temporal change. Here, we use linear modeling to explore spatial and temporal variation in bone Pb levels measured in samples taken from 329 Eurasian otters (Lutra lutra) found dead in southwest England. Between 1992 and 2004 Pb levels in otters fell by 73%, following UK legislative control of Pb emissions implemented since the mid 1980s. Spatial variation in bone Pb was positively correlated with modeled Pb emissions and stream sediment Pb, which interacted negatively with wind-speed and sediment Ca, respectively. Opportunistic collection of samples from wildlife mortalities provided a valuable opportunity for monitoring environmental contamination, interpretation of which was aided by spatially explicit analysis of environmental variables.
Related Concept Videos
Derivatives: Problem Solving
Osmoregulation in Fishes
Freshwater Microbial Ecology
The Periodic Table and Organismal Elements
Periodic Table Provides Information...
Toxicity Testing in Animals

