Metabolic responses of adult lion’s paw scallops Nodipecten subnodosus exposed to acute hyperthermia in relation to seasonal reproductive effort
|Author(s)||Salgado-García Rosa L.1, 2, Kraffe Edouard3, Maytorena-Verdugo Claudia I.2, Rivera-Camacho Alma R.1, Sicard M. Teresa2, Arellano-Martínez Marcial1, Racotta Ilie S.2|
|Affiliation(s)||1 : Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Instituto Politécnico Nacional (IPN), Av. Instituto Politécnico Nacional s/n Col, Playa Palo de Santa Rita Apdo. Postal 592, C. P. 23096, La Paz, B.C.S., Mexico
2 : Centro de Investigaciones Biológicas del Noroeste, S.C. (CIBNOR), Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, C.P. 23096, La Paz, B.C.S., Mexico
3 : Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280, Plouzane, France
|Source||Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-02 , Vol. 10 , N. 1 , P. 2449 (12p.)|
In marine ectotherms, reproduction is an energetically expensive process that affects their thermal window tolerance. For most species, the impacts of hyperthermia during gametogenesis have still not been addressed. Our aim was to assess the metabolic response of adult Nodipecten subnodosus scallops to thermal challenges at early development (spring) and advanced gonad maturation (summer). Scallops collected in both seasons were exposed to acute hyperthermia (26 and 30 °C, 24 h), maintaining a group of scallops at acclimation temperature (22 °C) as a control condition. During the summer, relatively low activity of hexokinase (HK), as well as low levels of ATP and GTP were found in the adductor muscle, suggesting a shift in energy investment for reproduction, although arginine phosphate (ArgP) levels were higher in summer scallops. Hyperthermia (30 °C) induced an increased energy expenditure reflected by a transitory enhanced oxygen consumption (VO2) and relatively high activities of HK and arginine kinase (AK). Moreover, a slight decrease in adenylic energy charge (AEC) was partially compensated by a decrease in ArgP. An increase in nucleotide by-products inosine monophosphate (IMP) and hypoxanthine (HX) indicated a thermal stress at 30 °C. Some of the responses to acute hyperthermia were more pronounced at advanced maturation stages (summer scallops), indicating a possible lack of energy balance, with possible implications in animals challenged to global warming scenario.