Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 561804
Title A kinematic analysis of tentacle extension in the squid Loligo pealei
Author(s) Kier, William M.; Leeuwen, Johan L. Van
Source Journal of Experimental Biology 200 (1997)1. - ISSN 0022-0949 - p. 41 - 53.
Publication type Refereed Article in a scientific journal
Publication year 1997
Keyword(s) cephalopod - kinematics - prey capture - squid - tentacle Loligo pealei
Abstract

High-speed cine recordings of prey capture by the squid Loligo pealei were used to analyze the kinematics of the rapid tentacular strike. The proximal portion of the tentacle, the stalk, elongates during the strike. The nonextensible distal portion of the tentacle, the club, contacts the prey and attaches using suckers. Seven sequences of prey capture filmed at 750 frames s-1 were analyzed frame by frame. The positions of the head, the tentacles and the prey were digitized, and the data were smoothed using quintic natural B-splines and the generalized cross-validation (GCV) criterion. During the strike, the animal swims forward at velocities ranging from 0.7-1.2 m s-1, and as the eight arms are flared, the tentacular stalks elongate. Tentacular extension occurred in approximately 20-40 ms with peak strains in the tentacular stalk ranging from 0.43-0.8. Peak longitudinal strain rates varied from 23-45 s-1. Maximum extension velocities of the stalk were calculated to be over 2 m s-1 with peak accelerations of approximately 250ms-2. Once the tentacular clubs have contacted the prey, the tentacular stalks are frequently observed to buckle.

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