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Effects of lead on avian thermoregulation in the heat: An experimental test with pied crows (Corvus albus).
McKechnie, Andrew E; Freeman, Marc T; Kemp, Ryno; Wolter, Kerri; Naidoo, Vinny.
Afiliación
  • McKechnie AE; South African Research Chair in Conservation Physiology, South African National Biodiversity Institute, South Africa; DSI-NRF Centre of Excellence at the FitzPatrick Institute, Department of Zoology and Entomology, University of Pretoria, South Africa. Electronic address: andrew.mckechnie@up.ac.za.
  • Freeman MT; South African Research Chair in Conservation Physiology, South African National Biodiversity Institute, South Africa; DSI-NRF Centre of Excellence at the FitzPatrick Institute, Department of Zoology and Entomology, University of Pretoria, South Africa.
  • Kemp R; Vulture Programme (VulPro), Plot 121, Rietfontein 0216, South Africa.
  • Wolter K; Vulture Programme (VulPro), Plot 121, Rietfontein 0216, South Africa.
  • Naidoo V; Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, South Africa.
Environ Toxicol Pharmacol ; 110: 104519, 2024 Sep.
Article en En | MEDLINE | ID: mdl-39059727
ABSTRACT
Many of the negative physiological effects of lead involve the hypothalamus, but the possibility that thermoregulation is affected has received little attention. We tested the hypothesis that lead exposure reduces avian thermoregulatory performance under hot conditions in pied crows (Corvus albus) experimentally exposed to lead in their diet. Crows in our high lead treatment (blood [Pb] = 87.3 ± 44.7 µg dL-1) showed significantly higher air temperature (Tair) inflections for evaporative water loss (EWL) and resting metabolic rate (RMR) compared to control (6.4 ± 1.8 µg dL-1) or intermediate (53.9 ± 23.7 µg dL-1) lead groups, which did not differ. EWL, RMR and body temperature (Tb) all increased more rapidly at Tair > Tb in the high lead treatment. In contrast, neither maximum Tair tolerated by the crows nor maximum Tb varied with treatment. Our data reveal that water and energy balance during hot weather is affected by lead exposure.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Regulación de la Temperatura Corporal / Cuervos / Calor / Plomo Límite: Animals Idioma: En Revista: Environ Toxicol Pharmacol Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Regulación de la Temperatura Corporal / Cuervos / Calor / Plomo Límite: Animals Idioma: En Revista: Environ Toxicol Pharmacol Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos