We describe necropsy lesions of three adult Yellow-rumped Warblers (Setophaga coronata) diagnosed with salmonellosis during a Salmonella enterica serovar Typhimurium outbreak. One warbler had filamentous organisms consistent with Macrorhabdus ornithogaster at the proventricular-ventricular isthmus. There is limited information on Macrorhabdus ornithogaster infections in wild North American birds.
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http://dx.doi.org/10.7589/JWD-D-21-00174 | DOI Listing |
J Exp Biol
April 2024
Department of Biology, Western University, London, ON, Canada, N6A 5B7.
Birds remodel their flight muscle metabolism prior to migration to meet the physiological demands of migratory flight, including increases in both oxidative capacity and defence against reactive oxygen species. The degree of plasticity mediated by changes in these mitochondrial properties is poorly understood but may be explained by two non-mutually exclusive hypotheses: variation in mitochondrial quantity or in individual mitochondrial function. We tested these hypotheses using yellow-rumped warblers (Setophaga coronata), a Nearctic songbird which biannually migrates 2000-5000 km.
View Article and Find Full Text PDFPhysiol Rep
October 2023
Department of Biology, University of Massachusetts Amherst, Massachusetts, USA.
Bird flight muscle can lose as much as 20% of its mass during a migratory flight due to protein catabolism, and catabolism can be further exacerbated under dehydrating conditions. However, the functional consequences of exercise and environment induced protein catabolism on muscle has not been examined. We hypothesized that prolonged flight would cause a decline in muscle mass, aerobic capacity, and contractile performance.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
April 2023
Department of Biology, University of Massachusetts, Amherst, MA 01003-9297.
During migration, long-distance migratory songbirds may fly nonstop for days, whereas shorter-distance migrants complete flights of 6 to 10 h. Fat is the primary fuel source, but protein is also assumed to provide a low, consistent amount of energy for flight. However, little is known about how the use of these fuel sources differs among bird species and in response to flight duration.
View Article and Find Full Text PDFSci Rep
July 2022
Department of Biology, Advanced Facility for Avian Research, University of Western Ontario, London, ON, Canada.
Methylmercury (MeHg) is a global pollutant that can cause metabolic disruptions in animals and thereby potentially compromise the energetic capacity of birds for long-distance migration, but its effects on avian lipid metabolism pathways that support endurance flight and stopover refueling have never been studied. We tested the effects of short-term (14-d), environmentally relevant (0.5 ppm) dietary MeHg exposure on lipid metabolism markers in the pectoralis and livers of yellow-rumped warblers (Setophaga coronata) that were found in a previous study to have poorer flight endurance in a wind tunnel than untreated conspecifics.
View Article and Find Full Text PDFJ Wildl Dis
July 2022
Department of Small Animal Clinical Sciences, University of Tennessee College of Veterinary Medicine, 2407 River Drive, Knoxville, Tennessee 37996, USA.
We describe necropsy lesions of three adult Yellow-rumped Warblers (Setophaga coronata) diagnosed with salmonellosis during a Salmonella enterica serovar Typhimurium outbreak. One warbler had filamentous organisms consistent with Macrorhabdus ornithogaster at the proventricular-ventricular isthmus. There is limited information on Macrorhabdus ornithogaster infections in wild North American birds.
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