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AB 5:13-22 (2009)  -  DOI:

Vertical distribution, behavior, chemical composition and metabolism of Stauroteuthis syrtensis (Octopoda: Cirrata) in the northwest Atlantic

Charles A. Jacoby1,*, Marsh J. Youngbluth2, Jessica R. Frost1,8, Per R. Flood3, Franz Uiblein4, Ulf Båmstedt5, Francesc Pagès6,†, David Shale7

1University of Florida, Gainesville, Florida 32653, USA
2Harbor Branch Oceanographic Institution at Florida Atlantic University, 5600 Highway 1 North, Fort Pierce, Florida 34946, USA
3Bathybiologica A/S, Gerhard Grans vei 58, 5081 Bergen, Norway
4Institute of Marine Research, Nordnesgaten 33, PB 1870 Nordnes, 5817 Bergen, Norway
5Umeå Marine Sciences Centre, Norrbyn, 910 20 Hörnefors, Sweden
6Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37–49, 08003 Barcelona, Spain
714 Victoria Avenue, Swanage, Dorset BH19 1AN, UK
8Present address: Institute for Hydrobiology and Fisheries Science, University of Hamburg, Olbersweg 24,
22767 Hamburg, Germany
*Email: Deceased

ABSTRACT: The cirrate octopod Stauroteuthis syrtensis is a mesopelagic species commonly collected in the North Atlantic. Individuals were observed at depths >600 m and typically within 100 m of the bottom in three ~900 m deep canyons indenting the southern edge of Georges Bank. When first sighted, most octopods were floating passively with their webbed arms gathered into a small ball. When disturbed, they expanded their webs to form a ‘balloon’ shape, swam slowly by sculling their fins, pulsed their webs like medusae and, in some cases, streamlined their arms and webs and moved away smoothly by rapidly sculling their fins. The bodies of 9 octopods comprised 92 to 95% water, with tissue containing 9 to 22% carbon (C) and 2 to 4% nitrogen (N). These values were similar to those reported for medusae and ctenophores. Oxygen (O2) consumption rates of 4.6 to 25.8 µmol O2 g–1 C h–1 were within ranges reported for medusae, ctenophores, and deep-water cephalopods. The stomachs of S. syrtensis, dissected immediately after capture, contained only the calanoid copepod Calanus finmarchicus. Calculations indicated that S. syrtensis need 1.3 to 30.1 ind. d–1 of C. finmarchicus to meet their measured metabolic demand. Excretion rates (0.3 to 12.4 µg NH4+ g–1 C h–1 and 0.06 to 4.83 µg PO43– g–1 C h–1) were at least an order of magnitude lower than rates reported for other octopods or gelatinous zooplankters. O:N ratios (11 to 366) suggested that S. syrtensis catabolized lipids, which may be supplied by C. finmarchicus. Vertical distribution, relatively torpid behavior and low metabolic rates characterized S. syrtensis as a benthopelagic and relatively passive predator on copepods.

KEY WORDS: Stauroteuthis syrtensis · Respiration · Excretion · Chemical composition · Vertical distribution · Behavior

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Cite this article as: Jacoby CA, Youngbluth MJ, Frost JR, Flood PR and others (2009) Vertical distribution, behavior, chemical composition and metabolism of Stauroteuthis syrtensis (Octopoda: Cirrata) in the northwest Atlantic. Aquat Biol 5:13-22.

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