• Login
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    The population dynamics of Patella vulgata and other limpets. 
    •   QMRO Home
    • Queen Mary University of London Theses
    • Theses
    • The population dynamics of Patella vulgata and other limpets.
    •   QMRO Home
    • Queen Mary University of London Theses
    • Theses
    • The population dynamics of Patella vulgata and other limpets.
    ‌
    ‌

    Browse

    All of QMROCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects
    ‌
    ‌

    Administrators only

    Login
    ‌
    ‌

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    The population dynamics of Patella vulgata and other limpets.

    View/Open
    BALLANTINEPopulationDynamics1961.pdf (13.28Mb)
    Publisher
    Queen Mary University of London
    Metadata
    Show full item record
    Abstract
    Useful generalisations can be made about limpet populations in much the same way as they can about individual animals. These generalisations can be expressed quantitatively and formed into a framework of population dynamics. In Patella vulgata populations a greater mean size (defined as the 50% accumulative weight size) indicates (i) a faster growth rate, (ii) a larger maximum size, (iii) an increased mortality rate, (iv) decreased mean and maximum life spans, (v) an increased settlement rate, (vi) an earlier and more rapid seasonal maturation of the gonad, (vii) a larger number of eggs produced per female and per unit weight, (viii) a lower radula ratio and a flatter shell at the mean size, than would be found in a population with a smaller mean size. The timing of sexual maturity and of sex change is independent of these correlated features of population dynamics. The correlations were established by the detailed study of four populations at Mount Batten, Plymouth; and verified by experimental alteration of the population structure and a survey of Patella on all types of shore. The range of Patella vulgata in S.W. Britain is limited at the top of the shore principally by desiccation. The penetration of sheltered conditions is determined by interaction between the fucoids and the limpets, On exposed shores, the lower limit is determined by competition between P. vulgata and P. aspera. There is no direct relationship between mean size and population density (expressed as weight per occupied area). P. vulgata is densest at the borders of the fucoid communities on sheltered shores, at the lowest levels on moderately exposed shores, and at the junction with the P. aspera populations on exposed shores. P. vulgata prevents fucoids from establishing communities on many rook surfaces, but where fucoids form dense stands, P. vulgata is not able to settle or feed. Physical factors do not directly limit the range of P. vulgata (except at the top of the shore), although they mediate the competition and interaction which decide the precise boundaries, Inside each P. vulgata population the growth rate 3.8 limited by intraspecific competition for the available food.
    Authors
    Ballantine, William James
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/1459
    Collections
    • Theses [3321]
    Copyright statements
    The copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author
    Twitter iconFollow QMUL on Twitter
    Twitter iconFollow QM Research
    Online on twitter
    Facebook iconLike us on Facebook
    • Site Map
    • Privacy and cookies
    • Disclaimer
    • Accessibility
    • Contacts
    • Intranet
    • Current students

    Modern Slavery Statement

    Queen Mary University of London
    Mile End Road
    London E1 4NS
    Tel: +44 (0)20 7882 5555

    © Queen Mary University of London.