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Biology of the basket star Gorgonocephalus caputmedusae (L.)

Artikel i vetenskaplig tidskrift
Författare Rutger Rosenberg
Samuel Dupont
Tomas Lundälv
Helen Nilsson Sköld
Alf Norkko
Josefin Roth
Thomas Stach
Michael C. Thorndyke
Publicerad i Marine Biology
Volym 148
Sidor 43-50
Publiceringsår 2005
Publicerad vid Institutionen för marin ekologi, Tjärnö marinbiologiska laboratorium
Institutionen för marin ekologi
Sidor 43-50
Språk en
Länkar dx.doi.org/10.1007/s00227-005-0032-...
Ämnesord brittlestar, basketstar, medusahuvud, ROV
Ämneskategorier Biologiska vetenskaper

Sammanfattning

Ophiurid basket stars belonging to the family Gorgonocephalidae are distributed from the Arctic to the Antarctic and from the shallow subtidal to the deep sea, but their biology remains poorly known. In situ observations at the mouth of the Oslofjord by a remotely operated vehicle showed that Gorgonocephalus caputmedusae had a patchy distribution at 85 to 120 m water depth and frequently occurred in association with the gorgonian Paramuricea placomus and the coral Lophelia pertusa. Morphological and histological studies show that G. caputmedusae is well adapted to capture macroplanktonic prey. Histological examination of the arms revealed the presence of a thick layer of dermal mutable connective tissue which is probably an energyefficient way to maintain its feeding posture against the current. This layer is connected to the nerve cord suggesting that the passive mechanical properties (stiffness) is controlled by the nervous system. In the distal parts of the arms, each segment has a pair of sticky tube feet and a sophisticated system of spines and hooks, which are connected to muscles and collagenous tendons. In combination, these features were shown, in an experimental flume study, to be used for capturing the locally abundant krill species Meganyctiphanes norvegica. This is the first documentation of G. caputmedusae of this kind

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