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- Title
Duration of life-cycle toxicity tests with the ostracod Heterocypris incongruens.
- Authors
Hiki, Kyoshiro; Tobino, Tomohiro; Nakajima, Fumiyuki; Tsukahara, Kenta
- Abstract
An acute sediment toxicity test using the ostracod Heterocypris incongruens is user friendly and has high sensitivity; however, a life-cycle test using this species has not been developed. The most challenging problem when developing a life-cycle test is that the egg development time varies greatly and is sometimes too long (> 150 d) to monitor. It is desirable to shorten the duration of life-cycle toxicity tests including the observation period of egg development while preserving the ecological relevance of the net reproductive rate ( R0), an endpoint in the life-cycle test. Therefore, in the present study, we suggest a practical test duration for R0 using population growth rate ( λ) as a measure of ecological relevance. We collected a range of life history characteristics of the ostracod by combining data from the literature and experimental results, constructed population matrix models, and calculated λ for 20 life history patterns. The results showed that a longer test period (> 150 d) did not increase the correlation coefficients between R0 and λ. Rather, a shorter test duration resulted in R0 being highly correlated with λ. Our results suggest that a life-cycle toxicity test using the ostracod can provide an ecologically relevant toxicity endpoint, even if the test is abandoned after approximately 50 d and unhatched eggs remain. Environ Toxicol Chem 2017;36:3443-3449. © 2017 SETAC
- Subjects
LIFE cycles (Biology); MARINE sediment quality; FRESHWATER ecology; TOXICOLOGY; PHOTOPERIODISM
- Publication
Environmental Toxicology & Chemistry, 2017, Vol 36, Issue 12, p3443
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.3931