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  • 1. Prendergast, Gabrielle S.
    et al.
    Zurn, Constanze M.
    Bers, A. Valeria
    Head, Ritchie M.
    Hansson, Lars J.
    SMHI, Forskningsavdelningen, Oceanografi.
    Thomason, Jeremy C.
    Field-based video observations of wild barnacle cyprid behaviour in response to textural and chemical settlement cues2008Ingår i: Biofouling (Print), ISSN 0892-7014, E-ISSN 1029-2454, Vol. 24, nr 6, s. 449-459Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Many marine invertebrate larvae respond behaviourally to environmental settlement cues, yet behaviours are often only inferred from settlement patterns or are limited to laboratory studies. The behaviour of wild cypris larvae of Semibalanus balanoides L. was filmed on settlement tiles in the field. Tiles were of five different textures with a nested treatment of crude conspecific adult extract (AE). The effects of texture and AE on eleven defined behaviours were analysed. Texture affected the gross and net exploratory distances, velocity, acceleration and time spent exploring. AE attracted more cyprids during the first minute of immersion and increased the time spent on surfaces. Relatively few arrivals that either travel far and fast, or exit the surface rapidly, may indicate a lower chance of settlement. An increase in time spent on a surface may increase the probability of being in contact with the surface when the sign stimulus to settle occurs.

  • 2. Prendergast, Gabrielle S.
    et al.
    Zurn, Constanze M.
    Bers, A. Valeria
    Head, Ritchie M.
    Hansson, Lars J.
    SMHI, Forskningsavdelningen, Oceanografi.
    Thomason, Jeremy C.
    The relative magnitude of the effects of biological and physical settlement cues for cypris larvae of the acorn barnacle, Semibalanus balanoides L.2009Ingår i: Biofouling (Print), ISSN 0892-7014, E-ISSN 1029-2454, Vol. 25, nr 1, s. 35-44Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Barnacle cypris larvae respond to many cues when selecting a settlement site. The settlement of over a million larvae on tiles of different textures, orientations and densities of incumbent settlers was measured on the rocky intertidal at Great Cumbrae, Scotland. Half of the tiles were replaced every tide whereas the others simultaneously accumulated settlers. Factor effects varied on each tide, and converged in the accumulating deployment. Increasing incumbent density led to net loss of settlement, which was less probable on the textures on which fastest settlment occurred ('very fine'), and more probable on those on which settlement was slowest ('smooth'). More settlement occurred on down-facing orientations during daylight and vice versa. Cue ranks were non-linear, so a path analysis model quantified the relative influence of each factor. Gregariousness was the most influential cue measured, although unmeasured factors had greater effects, highlighting the complexity of settlement influences in this species.

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