Marine Biodiversity

, Volume 44, Issue 1, pp 151–155 | Cite as

The cephalopod Taningia danae Joubin, 1931 observed near bottom at over 2,000 m depth on Seine seamount

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Abstract

We report the first in situ observations of a large Taningia danae Joubin, 1931, close to the seafloor at bathyal depths of 2,157 m. The observation was made in the subtropical northeast Atlantic Seine seamount during daytime on 29 September 2012, over a silt-covered seafloor (33º40.1142′N, 14º22.7301′W). Seawater temperature was 4.2 ºC, salinity 35.40 ppt, oxygen saturation 50.87 Ox%, and pressure 2,178.29 dbar. Mantle length was estimated from imagery to be 65.3 cm (STD = 6.3). A repeated behaviour was observed every time the ROV approached: (1) swimming away from the ROV by flapping the fins twice (moving forward or backward), (2) gliding slightly inclined downward, until colliding against the seafloor, and (3) ascending obliquely or vertically in relation to the seafloor, finally evading the area moving upward using jet propulsion. These observations greatly extend the species depth range and document behaviour patterns. T. danae is able to explore beyond the mesopelagic zone where it has previously been reported.

Keywords

Octopoteuthis Seine seamount Bathyal Benthos ROV Behaviour 

Supplementary material

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Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Centre of IMAR and Department of Oceanography and FisheriesUniversity of the AzoresHortaPortugal
  2. 2.LARSyS – Associated Laboratory for Robotics and Systems in Engineering and ScienceLisboaPortugal
  3. 3.Portuguese Task Group for the Extension of the Continental Shelf (EMEPC)Paço de ArcosPortugal

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