摘要:

ABSTRACTAll species of bat found in Britain have declined in numbers and all are classified as vulnerable or endangered. Their habitual use of roof voids for roosting and the formation of breeding colonies brings them into close contact with structural timbers which are often treated with long‐lasting pesticides to eradicate or prevent infestations of wood‐boring insects or wood‐rotting fungi. Some of the pesticides used have a considerable toxicity to mammals and are applied at a sufficiently high concentration to present a significant hazard to bats roosting on the treated timbers. Laboratory studies have shown that bats can be killed when they roost on timbers treated with lindane or pentachlorophenol, although some other chemicals, notably die synthetic pyrethroids, appear to be harmless. Numerous field incidents in which bats have been killed by remedial treatment chemicals emphasize the scale of the pr

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1989.tb00405.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

ABSTRACTAn enquiry was conducted into the changing status of the Water Vole Arvicola terrestris in Britain using an analysis of the data contained in County Mammal Reports. These were supplemented by a questionnaire survey and site descriptions from the Waterways Bird Survey organized by the British Trust for Ornithology. There was close conformity between the results obtained from these differing sources. There are indications that the Water Vole population has suffered a long‐term decline this century, possibly due to adverse habitat changes. Pollution of rivers in the 1950s by organochlorine insecticides, compounded in the 1960s and ′70s by the spread of the introduced American MinkMustela visonhave apparendy exacerbated the situation in recent years. All sources agreed that predation by Mink was considered to be the most important single threat to the Water Vole population. An objective survey is required to form the basis for a conservation plan and future monitoring of the Water Vole's sta

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1989.tb00406.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1989.tb00407.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY