Food limitation in Chironomus tepperi: Effects on survival, sex ratios and development across two generations

Townsend, K, Pettigrove, V and Hoffmann, A 2012, 'Food limitation in Chironomus tepperi: Effects on survival, sex ratios and development across two generations', Ecotoxicology and Environmental Safety, vol. 84, pp. 1-8.


Document type: Journal Article
Collection: Journal Articles

Title Food limitation in Chironomus tepperi: Effects on survival, sex ratios and development across two generations
Author(s) Townsend, K
Pettigrove, V
Hoffmann, A
Year 2012
Journal name Ecotoxicology and Environmental Safety
Volume number 84
Start page 1
End page 8
Total pages 8
Publisher Academic Press
Abstract Species from the Dipteran family Chironomidae are widely used in laboratory and field studies to identify toxicity in freshwater environments. However, toxicity assessments can be influenced by food availability, which can alter endpoints in assays including viability, sex ratios and development time. The aim of this study was to determine if food limitation affected the endpoints used in toxicity tests with the Australian model organism, Chironomus tepperi, including responses in offspring. First instar larvae were subjected to food treatments with larval density controlled and offspring were either raised under the same food conditions as their parents or under standard conditions. In lower food density treatments adults in the F0generation experienced delayed emergence and females produced fewer egg masses. F0diet affected the performance of F1to continued exposure and there was evidence that the quality of the offspring was compromised. Although sex ratios were not skewed, males and females responded differently to food limitation, especially in the F1generation where female development was more delayed. These results demonstrate that endpoints used in toxicity evaluation in C. tepperi also respond to food availability, highlighting the need to control for food in both laboratory and field toxicity studies. Multiple generations should ideally be exposed to stressors under laboratory conditions to elucidate likely long term effects in the field.
Subject Invertebrate Biology
Keyword(s) Chironomidae
Chironomus tepperi
Development
Food limitation
Multigenerational
Sex specificity
Toxicity testing
DOI - identifier 10.1016/j.ecoenv.2012.04.027
Copyright notice © 2012 Elsevier Inc
ISSN 0147-6513
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