| Author Title Journal |
Reynoldson TB (1958) Observations on the comparative ecology of lake-dwelling triclads in southern Sweden, Finland and northern Britain. Hydrobiologia 12: 129-141. |
Abstract / Notes
There are more lake-dwelling species of triclad in northern Britain (10) than in southern Sweden (7) and the distribution of some differ in the 2 countries over approximately comparable types of lake. Dendrocoelum lacteum occurs in a wide range of lake types in south Sweden but is restricted to more productive lakes in north Britain. Polycelis nigra (absent from Sweden) has a similar, wide occurrence in Britain. Planaria torva is more common in south Sweden in lakes of all types but particularly in the less productive lakes. The Polycelis species P. tenuis and P. hepta, also the Dugesia lugubris species complex show much the same distribution in both areas. Polycelis felina does not occur in Sweden. The small number of Finnish lakes sampled confirm the data for south Sweden. There is significant correlation between the total abundance of triclads and both the hardness and dissolved matter contents of the Swedish lake waters. Quantitatively the south Swedish triclad populations compare most closely with those of mid-Scotland in the north Britain area.
| Home page -- (Main hierarchy) |