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  • 1
    Electronic Resource
    Electronic Resource
    Appendage activity recordings of the sub-Antarctic copepod Drepanopus pectinatus in relation to its feeding behaviour (1991)
    Springer
    Polar biology 11 (1991), S. 431-438 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Movements of the cephalic appendages of nauplii (stages 3 and 4), copepodites (stage 4) and adult female Drepanopus pectinatus were investigated using a computerized micro-impedance unit. Direct measurements and visual observations of the behaviour of restrained copepods were made in the presence of filtered seawater, naturally occurring phytoplankton of different sizes, prefiltered extracts of phytoplankton and seston. The normal appendage movements recorded in filtered seawater were similar for adult females and copepodites. Traces for nauplii were different compared with those of the two other developmental stages. Appendage movements were modified when adult females were offered particles of different sizes and extracts of phytoplankton, showing significant changes in the frequency of the limb beats in relation to each stimulus. Impedance traces distinguished between activity of copepod appendages related to feeding and to swimming such as: flicking, stroking, jerking, combing, handling and rejecting particles. Prolonged recordings of restrained females in association with visual observations suggested that the activity of the mandibular palp was related to gut fullness and peristaltic movements, and to fecal pellet formation and evacuation. These results indicated that D. pectinatus is an intermittent beater responding to the physical and chemical characteristics of food.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233078
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Suspected mechano- and chemosensory structures of Temora longicornis (Copepoda: Calanoida) (1986)
    Springer
    Marine biology 93 (1986), S. 449-457 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The antennulary (A1) setae of Temora longicornis Müller are suspected of being mechanosensory. In the present study, the fine structure of the antennule, setae and pegs was examined by scanning and transmission electron microscopy. Two setae arise proximal to each antennule segment junction. The supraaxial (Type 1) seta of each pair is innervated by a pair of ciliary dendrites and has the morphological characteristics of a mechanoreceptor. The sub-axial (Type 2) seta may be chemosensory, and is innervated by a varying number of dendrites, but always more than two. The antennulary pegs do not appear to be innervated. T. longicornis is directionally sensitive to water disturbances, and this is consistent with the physical structure of the setae. Integumental structures on the body and other non-feeding appendages are described. These observations support previous behavioural experiments which suggested the antennule to be the major site for mechanoreception in copepods; however, mechanoreceptors must also occur on other parts of the body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401113
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Impedance traces of copepod appendage movements illustrating sensory feeding behaviour (1988)
    Springer
    Hydrobiologia 167-168 (1988), S. 303-310 
    Details
    ISSN: 1573-5117
    Keywords: copepod ; feeding ; sensory behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An experimental system incorporating a computerized micro-impedance unit has been used to make direct measurements of the activity of copepod cephalic appendages. As the appendages are used to both propel the copepod through water and handle particles, it follows that appendage activity reflects feeding behaviour. To investigate the sensory feeding behaviour of copepods, their activity was recorded with food stimuli varying in size and chemical composition. Sample impedance traces are given for the appendage movements of Temora longicornis in the presence of: 1 — filtered seawater; 2 — beads; 3 — phytoplankton cells; 4 — dissolved free amino acids. The normal appendage movements shown in filtered seawater were modified when copepods were offered particles and dissolved chemicals. Results show that chemical and mechanical stimuli are responsible for the recognition and selection of food. Impedance traces distinguish between behavioural responses such as: antennule flicks, leg kicks, combing, handling and rejection of particles. Spectral analyses of traces have demonstrated that differences in beat pattern are significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026318
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    Paper (German National Licenses)
    Fulltext
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