DECLINE OF THE SAND LIZARD, LACERTA-AGILIS L POPULATION ON THE SAND DUNES OF THE MERSEYSIDE COAST, ENGLAND

The population of the sand lizard Lacerta agilis in northwest England has declined sharply since 1930. The reasons for this decline are considered. Between Southport and the River Alt, approximately 50% of the sand dune habitat has been destroyed and a further 12% modified since 1801. Habitat losses resulting from building developments help to explain the sand lizard decline. The species has also disappeared from areas still supporting dune habitat. Here a combination of factors appear responsible, the effects of which are not uniform throughout the dune system. It is concluded that, in conjunction with a trend of less favourable climate over the last 15 years, habitat destruction, fragmentation and change of quality have brought about a catastrophic decline in the sand lizard population within the last 20 years. It is predicted that this population will become extinct before 2000 unless present trends are halted and adequate conservation measures taken. © 1979.