thumbnail

Quantifying differences in responses of aquatic insects to trace metal exposure in field studies and short-term stream mesocosm experiments

Environmental Science & Technology

By:
, ORCID iD , and
https://doi.org/10.1021/acs.est.7b06628

Links

Abstract

Characterizing macroinvertebrate taxa as either sensitive or tolerant is of critical importance for investigating impacts of anthropogenic stressors in aquatic ecosystems and for inferring causality. However, our understanding of relative sensitivity of aquatic insects to metals in the field and under controlled conditions in the laboratory or mesocosm experiments is limited. In this study, we compared the response of 16 lotic macroinvertebrate families to metals in short-term (10-day) stream mesocosm experiments and in a spatially extensive field study of 154 Colorado streams. Comparisons of field and mesocosm-derived EC20 (effect concentration of 20%) values showed that aquatic insects were generally more sensitive to metals in the field. Although the ranked sensitivity to metals was similar for many families, we observed large differences between field and mesocosm responses for some groups (e.g., Baetidae and Heptageniidae). These differences most likely resulted from the inability of short-term experiments to account for factors such as dietary exposure to metals, rapid recolonization in the field, and effects of metals on sensitive life stages. Understanding mechanisms responsible for differences among field, mesocosm, and laboratory approaches would improve our ability to predict contaminant effects and establish ecologically meaningful water-quality criteria.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Quantifying differences in responses of aquatic insects to trace metal exposure in field studies and short-term stream mesocosm experiments
Series title:
Environmental Science & Technology
DOI:
10.1021/acs.est.7b06628
Volume:
52
Issue:
7
Year Published:
2018
Language:
English
Publisher:
ACS
Contributing office(s):
Colorado Water Science Center
Description:
7 p.
First page:
4378
Last page:
4384