Sublethal effects of the parasiticide ivermectin on male and female reproductive and behavioural traits in the yellow dung fly

Koppenhagen, Nicola van; Gourgoulianni, Natalia; Rohner, Patrick T.; Roy, Jeannine; Wegmann, Alexandra; Blanckenhorn, Wolf U.

doi:10.1016/j.chemosphere.2019.125240

Cited by 7 publications

(9 citation statements)

References 36 publications

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“…Clutch size of the emerged adults was reduced by 25% to 34% in our two ivermectin treatments, as also found for the same species by van Koppenhagen et al (2020). Such negative effects of ivermectin on fecundity have been observed in a wide range of insects (Desneux et al, 2007), e.g.…”

Section: Ivermectin Effects On Adultssupporting

confidence: 88%

“…The latter implies slowed growth rates, probably due to altering neurotransmission pathways (Fritz et al, 1979). Similar results were found by Römbke et al (2009) and van Koppenhagen et al (2020) for the same species. Interestingly, ivermectin decreased the magnitude of sexual size dimorphism (SSD) (the difference in male and female body size) by disproportionately reducing the size of the larger sex, here the male.…”

Section: Ivermectin Effects On Larvaesupporting

confidence: 82%

“…70288-86-7) on foraging yellow dung fly larvae, three dung treatments were prepared: a control treatment C0plus two ivermectin concentrations (C1=12 µg ivermectin/kg and C2=24 µg ivermectin/kg wet dung, [0.36 and 0.72 mg ivermectin/50ml acetone, respectively]). These concentrations were previously determined experimentally based on range-finder survival-concentration curves (Supplementary material;van Koppenhagen et al, 2020). The contaminated dung was prepared before the experiment by adding a solution of ivermectin dissolved in acetone, and was then kept overnight at room temperature for the solvent to evaporate (Römbke et al, 2009).…”

Section: Dung Preparationmentioning

confidence: 99%

“…For instance, ivermectin decreased the survival rate of larvae by 50% within 48h at a concentration of 0.036 ppm (wt/wet weight), delayed larval development and reduced body size and reproductive success (Römbke et al, 2010), affected wing morphology (Strong and James, 1993) and the fly's immune system (West and Tracy, 2009). A recent study further showed a sub-lethal effect on mating behavior and reproduction when both larvae and adults were exposed to ivermectin (van Koppenhagen et al, 2020). The predatory diet of adult yellow dung flies makes this species prone to contamination via insect prey that has been sprayed by or was otherwise in contact with insecticides such as spinosad.…”

Section: Introductionmentioning

confidence: 99%

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Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect

et al. 2020

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Pesticides and veterinary products that are globally used in farming against pests and parasites are known to impact non-target beneficial organisms. While most studies have tested the lethal and sub-lethal effects of single chemicals, species are exposed to multiple contaminants that might interact and exacerbate the toxic responses of life-history fitness components. Here we experimentally tested an ecotoxicological scenario that is likely to be widespread in nature, with non-target dung communities being exposed both to cattle parasiticides during the larval stage and to agricultural insecticides during their adult life. We assessed the independent and combined consumptive effects of varying ivermectin and spinosad concentration on juvenile life-history and adult reproductive traits of the widespread yellow dung fly (Scathophaga stercoraria; Diptera: Scathophagidae). Larval exposure to ivermectin prolonged development time and reduced egg-to-adult survival, body size, and the magnitude of the male-biased sexual size dimorphism. The consumption by the predatory adult flies of spinosad-contaminated prey showed an additional, independent (from ivermectin) negative effect on female clutch size, and subsequent egg hatching success, but not on the body size and sexual size dimorphism of their surviving offspring. However, there were interactive synergistic effects of both contaminants on offspring emergence and body size. Our results document adverse effects of the combination of different chemicals on fitness components of a dung insect, highlighting transgenerational effects of adult exposure to contaminants for their offspring. These findings suggest that ecotoxicological tests should consider the combination of different contaminants for more accurate eco-assessments.

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Section: Ivermectin Effects On Adultssupporting

confidence: 88%

Section: Ivermectin Effects On Larvaesupporting

confidence: 82%

Section: Dung Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect

et al. 2020

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“…Sublethal effects of insecticides on the mating behavior and fecundity of adult C. pomonella were also observed as lower egg output, reduction of the reproductive period, and decreased production of offspring. Similar results with inhibition of reproduction by LCT or AM were also documented among other insect species including P. xylostella (Yin et al, 2008), Phaedon cochleariae (Müller et al, 2017) Scathophaga stercoraria (van Koppenhagen et al, 2020), and Phaedon cochleariae (Wolz et al, 2021a) exposed to pyrethroids or avermectins. Some studies have suggested that decreased fecundity is based on a direct toxic effect of the substances and/or an induced malformation of organs, while others have suggested that exposure to insecticides in larval stages leads to a reduced fat content in females which results in less energy allocation toward egg production (Nawaz et al, 2017; Wolz et al, 2021b).…”

Section: Discussionsupporting

confidence: 83%

Sublethal and transgenerational effects of lambda-cyhalothrin and abamectin on the development and reproduction of Cydia pomonella

Ju¹,

Liu²,

Li³

et al. 2022

Preprint

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The codling moth Cydia pomonella (Lepidoptera: Tortricidae) is a major invasive pest of pome fruits and walnuts worldwide. Lambda-cyhalothrin (LCT) and abamectin (AM) have been frequently used in C. pomonella control, but control of this pest is very difficult because shortly after hatching, larvae of this insect bore tunnels and hide inside host plant fruit. In this study, a simulated field spray bioassay method was developed against neonate larvae of C. pomonella and concentration-response bioassays were conducted to evaluate the susceptibility of the neonate larvae to LCT and AM. Exposure of neonate larvae to sublethal concentrations (LC30) of LCT or AM significantly reduced the survival rate of larvae (4th and 5th instars), lowered the mean weight of larvae and pupae, and decreased the daily maximal number of eggs laid and the total number of eggs laid (fecundity) per female. The sublethal effects, including reduced body mass, mean fecundity and net reproductive rate, extended mean generation time, and shortened oviposition period, were also found in transgenerational offspring. Furthermore, the transgenerational maternal effects were more obvious for AM than LCT, in comparison to the control. Additionally, the estimated population size was decreased by exposure to LC30 of LCT and AM, and the observed reduction of fecundity and population size within and across generations was likely the result of the downregulation of the reproduction-related vitellogenin gene (CpVg) after exposure to LC30 of LCT and AM. These results provide a better understanding of the overall effects of LCT and AM on C. pomonella and the transgenerational effects which should be taken into consideration when using insecticides in order to control C. pomonella.

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Sexually transmitted mutualist nematodes shape host growth across dung beetle species

Burdine,

Moczek,

Rohner

2024

Ecology and Evolution

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Many symbionts are sexually transmitted and impact their host's development, ecology, and evolution. While the significance of symbionts that cause sexually transmitted diseases (STDs) is relatively well understood, the prevalence and potential significance of the sexual transmission of mutualists remain elusive. Here, we study the effects of sexually transmitted mutualist nematodes on their dung beetle hosts. Symbiotic Diplogastrellus monhysteroides nematodes are present on the genitalia of male and female Onthophagus beetles and are horizontally transmitted during mating and vertically passed on to offspring during oviposition. A previous study indicates that the presence of nematodes benefits larval development and life history in a single host species, Onthophagus taurus. However, Diplogastrellus nematodes can be found in association with a variety of beetle species. Here, we replicate these previous experiments, assess whether the beneficial effects extend to other host species, and test whether nematode‐mediated effects differ between male and female host beetles. Rearing three relatively distantly related dung beetle species with and without nematodes, we find that the presence of nematodes benefits body size, but not development time or survival across all three species. Likewise, we found no difference in the benefit of nematodes to male compared to female beetles. These findings highlight the role of sexually transmitted mutualists in the evolution and ecology of dung beetles.

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Sublethal effects of the parasiticide ivermectin on male and female reproductive and behavioural traits in the yellow dung fly

Cited by 7 publications

References 36 publications

Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect

Fitness consequences of the combined effects of veterinary and agricultural pesticides on a non-target insect

Sublethal and transgenerational effects of lambda-cyhalothrin and abamectin on the development and reproduction of Cydia pomonella

Sexually transmitted mutualist nematodes shape host growth across dung beetle species

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