Robert M Woollacott

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Adult colonies of the bryozoan Bugula neritina release short-term anenteric larvae that initially are strongly photopositive. Over the course of several hours larvae lose their initial photopositivity and either become photonegative or alternate between positive and negative phototaxis. We report that newly released photopositive larvae rapidly become(More)
Larvae and adults of the marine bryozoan Watersipora cucullata invariably possess numerous extracellular mycoplasma-like, organisms. Mesodermally encapsulated groups of these atypical bacteria occur in the visceral coeloms of all colony members. In contrast, thousands of the symbionts are externally attached to each larva along a unique superficial groove;(More)
Larvae of the bryozoans Bugula neritina and Bugula stolonifera exhibit an apparent negative geotaxis under conditions of darkness and constant temperature. This behavior cannot be accounted for by buoyancy since the larvae are negatively bouyant, nor is it a consequence of gradients in the partial pressures of dissolved gases since the response occurs under(More)
For sessile invertebrates, the degree to which dispersal mechanisms transport individuals away from their natal grounds can have significant ecological implications. Even though the larvae of the marine bryozoan Bugula stolonifera have limited dispersal potential, high levels of genetic mixing have been found within their conspecific aggregations. In this(More)
Conspecific aggregations in terrestrial and aquatic organisms can have a significant effect on an individual's survival, growth and reproductive fitness, particularly if these aggregations are composed of closely related individuals. Such aggregations can form passively, as a consequence of dispersal, or actively, as a consequence of kin recognition. In(More)
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