Developmental effects of heatwave conditions on the early life stages of a coral reef fish.
J Exp Biol
; 222(Pt 16)2019 08 23.
Article
en En
| MEDLINE
| ID: mdl-31444281
ABSTRACT
Marine heatwaves, which are increasing in frequency, duration and intensity owing to climate change, are an imminent threat to marine ecosystems. On coral reefs, heatwave conditions often coincide with periods of peak recruitment of juvenile fishes and exposure to elevated temperature may affect their development. However, whether differences in the duration of high temperature exposure have effects on individual performance is unknown. We exposed juvenile spiny damselfish, Acanthochromis polyacanthus, to increasing lengths of time (3, 7, 30 and 108â
days post-hatching) of elevated temperature (+2°C). After 108â
days, we measured escape performance at present-day control and elevated temperatures, standard length, mass and critical thermal maximum. Using a Bayesian approach, we show that 30â
days or more exposure to +2°C leads to improved escape performance, irrespective of performance temperature, possibly owing to developmental effects of high temperature on muscle development and/or anaerobic metabolism. Continued exposure to elevated temperature for 108â
days caused a reduction in body size compared with the control, but not in fish exposed to high temperature for 30â
days or less. By contrast, exposure to elevated temperatures for any length of time had no effect on critical thermal maximum, which, combined with previous work, suggests a short-term physiological constraint of â¼37°C in this species. Our study shows that extended exposure to increased temperature can affect the development of juvenile fishes, with potential immediate and future consequences for individual performance.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Arrecifes de Coral
/
Peces
/
Rasgos de la Historia de Vida
/
Calor
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Año:
2019
Tipo del documento:
Article