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Metabolic rate and hypoxia tolerance in Girardinichthys multiradiatus (Pisces: Goodeidae), an endemic fish at high altitude in tropical Mexico.
Garduño Paz, Monica Vanessa; Méndez Sánchez, José Fernando; Burggren, Warren; García Martínez, José Luis Antonio.
Afiliação
  • Garduño Paz MV; Laboratorio de Ecofisiología Animal, Facultad de Ciencias, Universidad Autónoma del Estado de México, El Cerrillo Piedras Blancas carretera Toluca-Ixtlahuaca km 14.5, CP 50200 Toluca, Estado de México, Mexico. Electronic address: mvgardunop@uaemex.mx.
  • Méndez Sánchez JF; Laboratorio de Ecofisiología Animal, Facultad de Ciencias, Universidad Autónoma del Estado de México, El Cerrillo Piedras Blancas carretera Toluca-Ixtlahuaca km 14.5, CP 50200 Toluca, Estado de México, Mexico.
  • Burggren W; Developmental Physiology Lab, Department of Biological Sciences, University of North Texas, 1155 Union Circle #311277, Denton, TX 76203-5017, United States of America.
  • García Martínez JLA; Laboratorio de Ecofisiología Animal, Facultad de Ciencias, Universidad Autónoma del Estado de México, El Cerrillo Piedras Blancas carretera Toluca-Ixtlahuaca km 14.5, CP 50200 Toluca, Estado de México, Mexico.
Comp Biochem Physiol A Mol Integr Physiol ; 239: 110576, 2020 01.
Article em En | MEDLINE | ID: mdl-31526846
The darkedged splitfin (Amarillo fish), Girardinichthys multiradiatus is a vulnerable endemic fish species inhabiting central Mexico's high altitude Upper Lerma Basin, where aquatic hypoxia is exacerbated by low barometric pressures (lower PO2s), large aquatic oxygen changes, poor aquatic systems management and urban, agricultural and industrial pollution. The respiratory physiology of G. multiradiatus under such challenging conditions is unknown - therefore the main goal of the present study was to determine metabolic rates and hypoxia tolerance to elucidate possible physiological adaptations allowing this fish to survive high altitude and increasingly eutrophic conditions. Fish came from two artificial reservoirs - San Elías and Ex Hacienda - considered refuges for this species. Both reservoirs showed high dial PO2 variation, with hypoxic conditions before midday and after 20:00 h, ~4 h of normoxia (15 kPa) from 16:00-20:00, and ~4 h of hyperoxia (16-33 kPa) from 12:00-16:00. Standard metabolic rate at 20 ±â€¯0.5 °C of larvae from Ex Hacienda was significantly higher than those from San Elías, but these differences disappeared in juveniles and adults. Metabolic rate at 20 ±â€¯0.5 °C for adults was 9.8 ±â€¯0.1 SEM µmol O2/g/h. The metabolic scaling exponent for adults was 0.58 for San Elías fish and 0.83 for Ex Hacienda fish, indicating possible ecological effects on this variable. Post-larval fish in Ex Hacienda and all stages in San Elias site showed considerable hypoxia tolerance, with PCrit mean values ranging from 1.9-3.1 kPa, lower than those of many tropical fish at comparable temperatures. Collectively, these data indicate that G. multiradiatus is well adapted for the hypoxia associated with their high-altitude habitat.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Consumo de Oxigênio / Ciprinodontiformes / Brânquias / Hipóxia Limite: Animals País/Região como assunto: Mexico Idioma: En Revista: Comp Biochem Physiol A Mol Integr Physiol Assunto da revista: BIOLOGIA MOLECULAR / FISIOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de publicação: Estados Unidos
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Consumo de Oxigênio / Ciprinodontiformes / Brânquias / Hipóxia Limite: Animals País/Região como assunto: Mexico Idioma: En Revista: Comp Biochem Physiol A Mol Integr Physiol Assunto da revista: BIOLOGIA MOLECULAR / FISIOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de publicação: Estados Unidos