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Lethal and sublethal effects of five common herbicides on the wolf spider, Pardosa milvina (Araneae: Lycosidae)

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Abstract

We tested lethal and sublethal effects of five commonly applied herbicides on the agrobiont wolf spider Pardosa milvina. Pardosa were collected from two agricultural fields; one kept under continuous crop rotation and sprayed for over twenty years, the other had no pesticide application for the last twelve years. Male and female Pardosa from each site were exposed to one of seven herbicide treatments (atrazine, glyphosate, mesotrione, S-metolachlor, rimsulfuron, a combination of all five herbicides, or a distilled water control; N = 1201) and maintained for 52 days on the treated soil substrate. We recorded mortality, prey capture behavior, weight change, courtship behavior, and egg sac production across treatments. Mesotrione and the five-herbicide combination showed significantly higher mortality than control substrates while atrazine, glyphosate and S-metolachlor showed significantly higher survival than the control. Both male spiders and spiders collected from the conventional field had reduced survival under some herbicide treatments. Prey capture behavior varied significantly by herbicide treatment, sex, and site. We observed significant weight change differences in males and differences in egg sac production in females, with, compared to the control, significant male weight loss in the rimsulfuron treatment collected from the no herbicide field, and a decrease in egg sac production in rimsulfuron and S-metolachlor treatments among females collected from the no herbicide field. Our results show some herbicides may have modest but significant fitness benefits (atrazine, glyphosate, and S-metolachlor) while others strongly increase the mortality of a generalist predator (mesotrione and the combination herbicide treatment).

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Access to the original dataset is available from the authors upon request.

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Acknowledgements

We thank Doug Klingler for providing spray history information on his fields and his assistance with experimental agriculture.

Author contributions

All individuals and organizations involved in this work have been included among the list of authors. MP and AS conceived and designed the experiment. WW, BH, JP, and CJ collected test subjects. MP and AS confirmed species identity. WW, BH, JP, and CJ performed the assays and general maintenance. WW, BH, JP, and CJ entered data and organized spreadsheets. MP, AS, and WW statistically analyzed the data. WW, MP, and AS led the writing of the manuscript. All authors read and approved the manuscript.

Funding

This research was supported by the Susquehanna University Research Partners Program (for WW, BH, and JP) and Gundaker Summer Enrichment Fund (for CJ).

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Correspondence to Matthew Persons.

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Conflict of interest

The authors declare that they have no competing interests. MP currently serves on the Susquehanna University Institutional Animal Care and Use Committee (IACUC) but no approval is required from this committee for spiders as research subjects. MP has recently been appointment by the state of Pennsylvania for the Pennsylvania Pesticide Advisory Board. Although not currently a member of the board, this position is unpaid and he will represent the board in the capacity of “entomologist in public service”. None of the authors have been compensated, commissioned, or remunerated by any corporation to collect these data and none are employed in the pesticide industry.

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Ethics approval

This article does not contain any studies using human participants or vertebrate animals and conforms to all US and Pennsylvania laws. All animals alive at the conclusion of this study were returned to the field. This research adheres to the Animal Behavior Society Ethical Treatment of Animals Guidelines. No approval was required by the Susquehanna University institutional animal care and use committee (IACUC) since the committee has confirmed that no ethical approval is required when using spiders as test subjects.

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Ward, W., Heinly, B., Preston, J. et al. Lethal and sublethal effects of five common herbicides on the wolf spider, Pardosa milvina (Araneae: Lycosidae). Ecotoxicology 31, 1565–1582 (2022). https://doi.org/10.1007/s10646-022-02610-x

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  • DOI: https://doi.org/10.1007/s10646-022-02610-x

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