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Mean daily body mass (s.e.m.) according to the four treatments (Day 1-30) in the second half of the experiment. Daily administration of imidacloprid (0.205 mg kg body mass −1 mg/day) occurred from day 4 to 30 after hatching. Food treatment began on day 5. Blood samples were taken on days 15 and 30 (Ad libitumControl n = 18, Ad libitum-Imidacloprid n = 13, Restricted-Control n = 19, Restricted-Imidacloprid n = 10). Inserted boxplot shows body mass according to treatments on 800 day old birds. Boxes indicate interquartile range, middle lines indicate median, whiskers show the minimum and maximum values within 1.5 × the interquartile range while dots outside the whiskers represent outliers ( < 1.5× interquartile range from box).
Source publication
Neonicotinoids are insecticides widely used as seed treatments that appear to have multiple negative effects on birds at a diversity of biological scales. Adult birds exposed to a low dose of imidacloprid, one of the most commonly used neonicotinoids, presented reduced fat stores, delayed migration and potentially altered orientation. However, litt...
Context in source publication
Context 1
... long-term effects of early imidacloprid exposure on body, lean and fat mass using quantitative magnetic resonance on days 90 and 800. We also examined effects on basal metabolic rate measured by respirometry [on day 800 after keeping the birds in optimal nutritional and daylight conditions with no further imidacloprid exposure (see insert in Figs. 1 and 2)]. www.nature.com/scientificreports/ At day 90 when birds are considered adult and able to breed, we did not detect any residual effect of early imidacloprid exposure and food restriction on SMI (See "Appendix D1 and D2"), which indicates that the birds condition had recovered within 60 days after the end of imidacloprid exposure. The ...
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Seed treatment as a method of local application of pesticides in precise agriculture reduces the amount of pesticides used per unit area and is considered to be the safest, cheapest and most ecologically acceptable method of protecting seeds and young plants from pests in the early stages of their development. With the introduction of insecticides...
Citations
... Several studies have demonstrated that contaminants can alter the functioning of the HPT axis and the metabolism of vertebrates (e.g., Braham & Neal, 1974), but most of these studies have focused on polychlorinated biphenyls (French et al., 2001;Smits et al., 2002;Tori & Mayer, 1981;Verreault et al., 2007;Voltura & French, 2000), organochlorine pesticides (Blévin et al., 2017), polybrominated diphenyl ethers (Allen et al., 2016;Lema Sean et al., 2008), per-and polyfluoroalkyl compounds (Ask et al., 2021;Blévin et al., 2017;Sebastiano et al., 2021), and neonicotinoids (Zgirski et al., 2021). The potential impact of endocrine disruptors on metabolism remains neglected, especially regarding contaminants of emerging interest such as azoles. ...
Triazole compounds are among the most widely used fungicides in agroecosystems to protect crops from potential fungal diseases. Triazoles are suspected to have an impact on non‐target species due to their interactions with non‐fungal sterol synthesis and wild birds are likely to be contaminated by triazoles fungicides as many of them live in agroecosystems. We experimentally tested whether exposure to environmental concentrations of a triazole could alter key integrative traits (metabolic rates and body condition) of an agroecosystem sentinel species, the house sparrow (Passer domesticus). Wild‐caught adult sparrows were maintained in captivity and exposed (exposed group) or not (control group) for seven continuous months to tebuconazole through drinking water. The metabolic rates of exposed and control sparrows were then measured at two different temperatures (i.e., 12°C and 25°C), which correspond respectively to the thermoregulation and thermoneutrality temperatures of this species. We found that exposed sparrows had lower resting metabolic rates (i.e., measured at thermoneutrality, 25°C) than controls. However, the thermoregulatory metabolic rates (i.e., measured at 12°C) did not differ between exposed and control sparrows. Although the body mass and condition were not measured at the beginning of the exposure, sparrows at the time of the metabolic measurements seven months after the onset of such exposure had a higher body condition than controls, supporting further the idea that tebuconazole affects metabolic functions.. Our study demonstrates for the first time that the use of tebuconazole can alter metabolism and could potentially lead to adverse effects in birds. This article is protected by copyright. All rights reserved.
