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Flexibility in metabolic rate and activity level determines individual variation in overwinter performance ArchiMer
Auer, Sonya K.; Salin, Karine; Anderson, Graeme J.; Metcalfe, Neil B..
Energy stores are essential for the overwinter survival of many temperate and polar animals, but individuals within a species often differ in how quickly they deplete their reserves. These disparities in overwinter performance may be explained by differences in their physiological and behavioral flexibility in response to food scarcity. However, little is known about whether individuals exhibit correlated or independent changes in these traits, and how these phenotypic changes collectively affect their winter energy use. We examined individual flexibility in both standard metabolic rate and activity level in response to food scarcity and their combined consequences for depletion of lipid stores among overwintering brown trout (Salmo trutta). Metabolism and...
Tipo: Text Palavras-chave: Activity rate; Intraspecific variation; Lipid stores; Metabolic rate; Phenotypic flexibility.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00413/52498/53299.pdf
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Metabolic responses of channel catfish (Ictalurus punctatus) exposed to phenol and post-exposure recovery Anais da ABC (AABC)
Moraes,Fernanda D.; Rossi,Priscila A.; Figueiredo,Juliana S.L.; Venturini,Francine P.; Cortella,Lucas R.X.; Moraes,Gilberto.
Metabolic adjustments were studied in channel catfish Ictalurus punctatus exposed to 1.5 mg L-1 of phe nol (10% LC50) for four days and recovered for seven days. Lower triacylglycerol (TGA) stores and increased muscle fat free acids (FFA) suggest fat catabolism in muscle. Remarkable liver FFA decrease (-31%) suggests liver fat catabolism as well. Increased muscular ammonia levels and ASAT (aspartate aminotransferase) and decreased plasma aminoacids suggest higher muscular amino acid uptake. Constant levels of glucose and increased liver glycogen stores, associated with lower amino acids in plasma, indicate gluconeogenesis from amino acids. This is supported by higher hepatic ALAT and ASAT. Higher hepatic LDH followed by lower plasma lactate may indicate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Metabolic adjustments; Enzymes; Lipid stores; Intermediary metabolism; Recovery; Xenobiotic.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300865
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