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Agricultural intensity in ovo affects growth, metamorphic development and sexual differentiation in the Common toad (Bufo bufo)

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Abstract

Pollution was cited by the Global Amphibian Assessment to be the second most important cause of amphibian decline worldwide, however, the effects of the agricultural environment on amphibians are not well understood. In this study, spawn from Bufo bufo was taken from four sites in England and Wales with varying intensities of arable agriculture. Spawn was either placed in tanks containing aged tap water (ex-situ, five replicates) or in cages at the native site (caged, five replicates). Hatching success, abnormal tadpoles, and forelimb emergence were recorded during the larval stage. Individuals were also sampled at five time points (TP) during development (5-, 7-, 9-, 12-, 15-weeks post-hatch) and analysed for morphological parameters. The thyroids (TP2) and the gonads (TP3,4,5) were also analysed histologically. With the exception of the thyroid histopathology, all analysed endpoints were significantly different between ex-situ individuals reared under identical conditions from the different sites. In addition, intensity of arable agriculture had a negative effect on growth and development. At one site, despite distinct rearing conditions, a high level of intersex (up to 42%) and similar sex ratios were observed in both ex-situ and caged individuals. Taken together, these data suggest that maternal exposure and/or events in ovo had a much larger effect on growth, metamorphic development, and sexual differentiation in B. bufo than the ambient environment. This could have important implications for traditional exposure scenarios that typically begin at the larval stage. Intersex is reported for the first time in European amphibians in situ, highlighting the potential use of distinct populations of amphibians in fundamental research into the aetiology of specific developmental effects in wild amphibians.

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Abbreviations

TP:

Time point

SVL:

Snout-vent length

HLL:

Hindlimb length

FLE:

Forelimb emergence

DO:

Dissolved oxygen

TO:

Testicular oocyte

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Acknowledgments

Funding from DEFRA gratefully acknowledged. Also, the generous sharing of amphibian databases from Froglife (registered charity: 1093372).

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  1. Frances Orton

    Present address: Centre for Toxicology, School of Pharmacy, University of London, 29/39 Brunswick Square, London, WC1N 1AX, UK

Authors and Affiliations

  1. Institute for the Environment, Brunel University, Kingston Lane, Uxbridge, UB8 3PH, UK

    Frances Orton & Edwin Routledge

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Correspondence to Frances Orton.

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Orton, F., Routledge, E. Agricultural intensity in ovo affects growth, metamorphic development and sexual differentiation in the Common toad (Bufo bufo). Ecotoxicology 20, 901–911 (2011). https://doi.org/10.1007/s10646-011-0658-5

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