We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham e-Theses
You are in:

The holdfast ecosystem of laminaria hyprborea (gunn,) fosl. and environmental monitoring: an ecological study

Sheppard, Charles (1976) The holdfast ecosystem of laminaria hyprborea (gunn,) fosl. and environmental monitoring: an ecological study. Doctoral thesis, Durham University.



The holdfast fauna eonsystem of Laminaria hyperborea was tested for use as a means of environmental monitoring. Samples of about three litres of holdfast space are desirable sample sizes although one litre is the absolute minimum. Several natural environmental variables, namely fresh water, rock type, depth, exposure and sedimentation were shown to have no significant effects on holdfast fauna composition. In pollution monitoring therefore these can be disregarded as complicating factors. Gradients of heavy metals and water clarity around the U.K. were defined. To these two variables were added those of latitude and longitude, and these four variables have marked effects on holdfast faunas. Changes in holdfast composition at the 35 main sites sampled are interpreted in the light of these variables. Along the North Sea and West coast sewage pollution and heavy metals respectively have a marked effect on the fauna. Along the South coast unidentified variables correlating very closely with longitude are important. Emphasis in interpretation must be placed on numbers of organisms, species richness and diversity in known sample sizes of holdfasts, and on the community trophic structure. Species presence / absence information has no meaning in holdfast work.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Thesis Date:1976
Copyright:Copyright of this thesis is held by the author
Deposited On:18 Sep 2013 15:38

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitter