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Journal of the Australian Rangeland Society
RESEARCH ARTICLE

Effects of ivermectin on soil nutrient cycling, plant biomass, and dung beetle abundance

Shiva Torabian https://orcid.org/0000-0001-8235-8847 A * , A. Joshua Leffler A and Lora Perkins A
+ Author Affiliations
- Author Affiliations

A Department of Natural Resource Management, South Dakota State University, Brookings, SD, USA.

* Correspondence to: shiva_torabian@yahoo.com

The Rangeland Journal 45(6) 224-234 https://doi.org/10.1071/RJ24009
Submitted: 20 March 2024  Accepted: 22 May 2024  Published: 6 June 2024

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of the Australian Rangeland Society.

Abstract

Ivermectin, a commonly used parasiticide, is known to affect dung beetle abundance when present in cattle dung. In this experimental study, we explicitly manipulated ivermectin concentrations in dung pats to examine its effects on dung beetle abundance, soil properties, and plant growth throughout the growing seasons of spring and summer in a western South Dakota grassland. Dung pats containing zero, low (2 mg/kg), and high (10 mg/kg) concentrations of ivermectin were strategically placed in the grassland in summer 2019 and spring 2021. Over a period of 63 days, we monitored changes in the nitrogen content of dung, soil, plants, as well as the abundance of dung beetles, and plant biomass. Our findings indicated that beetle abundance was 50% greater in dung pats without ivermectin, especially when the dung was fresh. However, ivermectin concentrations did not significantly alter the nitrogen content in dung and plants across both seasons, nor was there a discernible effect on plant biomass, despite the pronounced impact on dung beetle abundance.

Keywords: dung, Grassland, inorganic nitrogen, inorganic phosphorus, parasiticide, plant growth.

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