The Criconematidae of the British Isles

A total of 2622 soil samples collected throughout the British Isles was examined for nematodes belonging to the family Criconematidae. Twenty-eight species were found representing nine genera, twenty-two of these species being reported for the first time. Only one species previously reported was not found. An analysis of the relationship between eleven of the most common species and biotic and abiotic factors showed vegetation to be of paramount importance.     

The Wintering of Blackcaps in the British Isles

During this century the Blackbird has become one of the commonest urban and suburban song-birds in Britain. In an effort to discover why town life attracts so many Blackbirds, the author has looked closely at the B.T.O. data, derived mainly from ringing and nest records, and has found interesting differences in productivity between London and rural populations.     

The status of the Chough in the British Isles

This review of our current knowledge of the movements of Fulmars to and from their breeding colonies, and of the relationship of this phenomenon with such questions as the annual moult and the first return of immature birds, shows how incomplete is our understanding of this expanding species.     

The scarcer freshwater fishes of the British Isles

This, the first of two papers on the scarcer freshwater fishes of the British Isles, gives an account of the introduced species. Nineteen species are included. The natural distribution of these fishes, the history of their introduction, their success in acclimatization, and their present distribution in the British Isles are given. A brief discussion on the introduction of exotic fishes to aquatic ecosystems follows.     

The distribution of Gobius cobitis in the British Isles

Records of occuerence of Gobius cobitis on the British coast are listed from the literature and from extensive collecting in interfidal areas. In Britain the number of suitable habitats is reduced and the density of population is lower than in the Channel Islands and Brittany.     

Cladonia azorica in the British Isles

Abstract:Cladonia azorica is widespread in western Great Britain, mainly as the grey colour-form lacking usnic acid. Cladonia azorica is distinguished from the related species C. portentosa and C. mediterranea by the presence of fumarprotocetraric acid, and from C. ciliata by a number of characters including the presence of perlatolic acid. The structure of the pycnidial wall may have some taxonomic significance in Cladonia subgenus Cladina.