How size relates to oxygen consumption,ammonia excretion,and ingestion rates in cold (<Emphasis Type="Italic">Enteroctopus megalocyathus</Emphasis>) and tropical (<Emphasis Type="Italic">Octopus maya</Emphasis>) octopus species |
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Authors: | Email author" target="_blank">Ana?FaríasEmail author Iker?Uriarte Jorge?Hernández Soledad?Pino Cristina?Pascual Claudia?Caamal Pedro?Domíngues Carlos?Rosas |
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Institution: | (1) Instituto de Acuicultura, Universidad de Austral, Puerto Montt, Chile;(2) CIEN Austral, Puerto Montt, Chile;(3) Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, UNAM, Puerto de Abrigo s/n, Sisal, Yucatán, Mexico;(4) Centro IFAPA, Agua del Pino, Carretera Punta Umbría-Cartaya s/n, 21450 Cartaya, Spain;(5) Present address: Departamento de Ecología y Biología Animal Edificio de Ciencias Experimentales, Universidad de Vigo, Vigo, Spain |
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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 = aBW
b
. 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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