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Growth, development and sex ratios of spotted marsh frog (Limnodynastes tasmaniensis) larvae exposed to atrazine and a herbicide mixture

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posted on 2017-12-06, 00:00 authored by N Spolyarich, R Hyne, Scott WilsonScott Wilson, C Palmer, M Byrne
Exposures of Limnodynastes tasmaniensis tadpoles to atrazine (0.1, 1, 3 and 30 μg L−1), metolachlor (0.1, 1 and 10 μg L−1) and thiobencarb (90, 180 and 360 μg L−1) from Gosner stage 28 to 42 under controlled laboratory conditions gave no significant effects on tadpole growth, development and sex ratios. A binary mixture of atrazine and thiobencarb as well as a ternary mixture of all three herbicides also had no significant effects on the developing larvae to show no evidence of interactive toxicity. Abnormal gonad morphology was observed on two occasions; both from 0.1 μg L−1 atrazine treatments with one tadpole observed with testicular ovarian follicles. The low frequencies of abnormal gonadal morphology and testicular ovarian follicles did not indicate a concentration associated response to herbicide exposure. No significantly unbalanced sex ratios were observed to suggest any evidence of chemically induced feminisation. These observations suggest that environmentally relevant concentrations of atrazine, metolachlor and thiobencarb do not present a significant threat to the normal development of L. tasmaniensis larvae in surface waters of irrigated agricultural areas.

Funding

Category 2 - Other Public Sector Grants Category

History

Volume

78

Start Page

807

End Page

813

Number of Pages

7

ISSN

0045-6535

Location

Amsterdam, Netherlands

Publisher

Elsevier

Language

en-aus

Peer Reviewed

  • Yes

Open Access

  • No

External Author Affiliations

Centre for Environmental Management; Dept. of Environment, Climate Change and Water; Institute for Resource Industries and Sustainability (IRIS); University of Sydney; University of Technology, Sydney;

Era Eligible

  • Yes

Journal

Chemosphere.

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