Seabream Larval Physiology under Ocean Warming and Acidification

Fisiología larvaria de la dorada bajo el calentamiento y la acidificación del océano

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ID: 117098
2019
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Abstract
The vulnerability of early fish stages represents a critical bottleneck for fish recruitment; therefore, it is essential to understand how climate change affects their physiology for more sustainable management of fisheries. Here, we investigated the effects of warming (OW; +4 °C) and acidification (OA; ΔpH = 0.5) on the heart and oxygen consumption rates, metabolic enzymatic machinery—namely citrate synthase (CS), lactate dehydrogenase (LDH), and ß-hydroxyacyl CoA dehydrogenase (HOAD), of seabream (Sparus aurata) larvae (fifteen days after hatch). Oxygen consumption and heart rates showed a significant increase with rising temperature, but decreased with pCO2. Results revealed a significant increase of LDH activity with OW and a significant decrease of the aerobic potential (CS and HOAD activity) of larvae with OA. In contrast, under OA, the activity levels of the enzyme LDH and the LDH:CS ratio indicated an enhancement of anaerobic pathways. Although such a short-term metabolic strategy may eventually sustain the basic costs of maintenance, it might not be adequate under the future chronic ocean conditions. Given that the potential for adaptation to new forthcoming conditions is yet experimentally unaccounted for this species, future research is essential to accurately predict the physiological performance of this commercially important species under future ocean conditions.
La vulnerabilidad de los estadios tempranos de los peces representa un cuello de botella crítico para el reclutamiento pesquero; por lo tanto, es esencial comprender cómo afecta el cambio climático a su fisiología para lograr una gestión más sostenible de las pesquerías. En este estudio, investigamos los efectos del calentamiento (OW; +4 °C) y la acidificación (OA; ΔpH = 0,5) sobre la frecuencia cardíaca, las tasas de consumo de oxígeno y la maquinaria enzimática metabólica—en concreto, la citrato sintasa (CS), la lactato deshidrogenasa (LDH) y la ß-hidroxiacil-CoA deshidrogenasa (HOAD)—de larvas de dorada (Sparus aurata) (quince días después de la eclosión). El consumo de oxígeno y la frecuencia cardíaca mostraron un aumento significativo con el incremento de la temperatura, pero disminuyeron con la pCO2. Los resultados revelaron un aumento significativo de la actividad de la LDH con el OW y una disminución significativa del potencial aeróbico (actividad de CS y HOAD) de las larvas con la OA. Por el contrario, bajo OA, los niveles de actividad de la enzima LDH y la relación LDH:CS indicaron una potenciación de las vías anaeróbicas. Aunque dicha estrategia metabólica a corto plazo puede sostener eventualmente los costes básicos de mantenimiento, podría no ser adecuada bajo las futuras condiciones crónicas del océano. Dado que el potencial de adaptación a las nuevas condiciones venideras aún no ha sido determinado experimentalmente para esta especie, la investigación futura resulta esencial para predecir con precisión el rendimiento fisiológico de esta especie de gran importancia comercial bajo las futuras condiciones oceánicas.
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pimentel2019fishesseabream Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Marta S. Pimentel;Filipa Faleiro;Jorge Machado;Pedro Pousão-Ferreira;Rui Rosa;Pimentel, Marta S.;Faleiro, Filipa;Machado, Jorge;Pousão-Ferreira, Pedro;Rosa, Rui;
Journal fishes
Year 2019
DOI
10.3390/fishes5010001
URL
https://www.mdpi.com/2410-3888/5/1/1
Keywords
climate change metabolism sparus aurata oxygen consumption fish larvae aerobic potential anaerobic potential

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