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Title: Studies on the taxonomy, ecology and behaviour of "Orchestia gammarella" (Pallas), "O. mediterranea" A. Costa and "O. cavimana" Heller in the Medway Estuary
Author: Wildish, D. J.
ISNI:       0000 0004 2739 3430
Awarding Body: University of London
Current Institution: University of London
Date of Award: 1969
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During taxonomic work on tho three species of Orchestia studied a new morph and a new subspecies were discovered and described. Discriminatory criteria are given by which all the life history stages of these forms could be distinguished, except juvenile C. mediterranea and C. cavimana. The estuarine penetration and shore position of species of Orchestia in the Medway estuary was studied and compared with that in other estuaries. Laboratory investigations suggested that dilute seawater affected both survival and moult length and that these were important factors limiting estuarine penetration. The role of active locomotion in zonal aggregation was investigated and it was thought that visual attract ion was one of the stimulii involved in maintaining up and down shore directional trends. Species of Orchestia were nocturnal and showed definite circadian rhythms of activity which, in O. mediterranea, was related to extrinsic lunar/tidal rhythms.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available