title: Slow swimming, fast strikes: effects of feeding behavior on scaling of anaerobic metabolism in epipelagic squid.
abstract: Many pelagic fishes engage prey at high speeds supported by high metabolic rates and anaerobic metabolic capacity. Epipelagic squids are reported to have among the highest metabolic rates in the oceans as a result of demanding foraging strategies and the use of jet propulsion, which is inherently inefficient. This study examined enzymatic proxies of anaerobic metabolism in two species of pelagic squid, Dosidicus gigas and Doryteuthis pealeii (Lesueur 1821), over a size range of six orders of magnitude. We hypothesized that activity of the anaerobically poised enzymes would be high and increase with size as in ecologically similar fishes. In contrast, we demonstrate that anaerobic metabolic capacity in these organisms scales negatively with body mass. We explored several cephalopod-specific traits, such as the use of tentacles to capture prey, body morphology and reduced relative prey size of adult squids, that may create a diminished reliance on anaerobically fueled burst activity during prey capture in large animals.
authors: Department of Biological Sciences, La Sierra University, Riverside, CA 92505, USA Department of Biological Sciences, University of Rhode Island, Kingston, RI 02881, USA Lloyd.Trueblood@LaSierra.edu.
authors: Lloyd A
authors: LA
authors: Trueblood
authors: Department of Biological Sciences, University of Rhode Island, Kingston, RI 02881, USA.
authors: Brad A
authors: BA
authors: Seibel
mesh_terms: D000594:Amino Acid Oxidoreductases / Q000378:metabolism; D000693:Anaerobiosis; D000818:Animals; D049628:Body Size / Q000502:physiology; D049832:Decapodiformes / Q000033:anatomy & histology* / Q000378:metabolism*; D004734:Energy Metabolism; D005247:Feeding Behavior / Q000502:physiology*; D013550:Swimming / Q000502:physiology*
chemical_list: D000594:Amino Acid Oxidoreductases; C021903:D-octopine dehydrogenase
keywords: Glycolitic scaling; Metabolic capacity; Tentacles