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How size relates to oxygen consumption, ammonia excretion, and ingestion rates in cold (Enteroctopus megalocyathus) and tropical (Octopus maya) octopus species

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Abstract

The scaling of metabolic rates with body mass is one of the best known and most studied characteristics of aquatic animals. Herein, we studied how size is related to oxygen consumption, ammonia excretion, and ingestion rates in tropical (Octopus maya) and cold-water (Enteroctopus megalocyathus) cephalopod species in an attempt to understand how size affects their metabolism. We also looked at how cephalopod metabolisms are modulated by temperature by constructing the relationship between metabolism and temperature for some benthic octopod species. Finally, we estimated the energy balance for O. maya and E. megalocyathus in order to validate the use of this information for aquaculture or fisheries management. In both species, oxygen consumption and ammonia excretion increased allometrically with increasing body weight (BW) expressed as Y = aBWb. For oxygen consumption, b was 0.71 and 0.69 for E. megalocyathus and O. maya, respectively, and for ammonia excretion it was 0.37 and 0.43. Both species had low O/N ratios, indicating an apparent dependence on protein energy. The mean ingestion rates for E. megalocyathus (3.1 ± 0.2% its BW day−1) and O. maya (2.9 ± 0.5% its BW day−1) indicate that voracity, which is characteristic of cephalopods, could be independent of species. The scope for growth (P = I − (H + U + R) estimated for E. megalocyathus was 28% higher than that observed in O. maya (320 vs. 249 kJ day−1 kg−1). Thus, cold-water cephalopod species could be more efficient than tropical species. The protein and respiratory metabolisms of O. maya, E. megalocyathus, and other octopod species are directly dependent on temperature. Our results offer complementary evidence that, as Clarke (2004) stated, the metabolic response (R and U) cannot be determined mechanistically by temperature, as previously proposed (Gillooly et al. 2002).

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Acknowledgments

The study on Enteroctopus megalocyathus was financed by FONDECYT 1070800 and FONDEF D04 I1401. The study of O. maya was financed by DGAPA-UNAM project No. IN 216006-3 and CONACYT-Básico 2007-24743. We thank the Programa Bicentenario de Ciencia y Tecnología of CONICYT project ACI-34 for contributing to the collaborative work between Chilean and Mexican teams. We finally thank Ms. Jessica Dörner of HIM-UACH and Mr. Juan Carlos Rojas of UNAM for their valuable technical assistance. Thanks are given to anonymous referees that helped us improve the original manuscript.

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Correspondence to Ana Farías.

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Communicated by H. O. Pörtner.

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Farías, A., Uriarte, I., Hernández, J. et al. How size relates to oxygen consumption, ammonia excretion, and ingestion rates in cold (Enteroctopus megalocyathus) and tropical (Octopus maya) octopus species. Mar Biol 156, 1547–1558 (2009). https://doi.org/10.1007/s00227-009-1191-4

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  • DOI: https://doi.org/10.1007/s00227-009-1191-4

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