摘要:

AbstractThe number of sites at which evidence of otters was found and the total number of signs were recorded on fifty 5‐km stretches of rivers in Wales and the West Midlands of England. Data were collected on fifteen parameters of habitat considered to be of importance to otters and subjected to a multivariate analysis.Evidence of otters was found at thirty‐four stretches. The distribution of sites and signs was correlated with the presence of potential holts (of which 107 were found) and with mature sycamore and ash trees. The measured variables accounted for 52 5% of the overall variation in otter sites and 60 2% of the variation in otter signs. The conservation of otters is discussed in light of the results of the analy

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00259.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

AbstractNational field surveys for otters were carried out between 1977 and 1981. The species is apparently absent from large areas of England, although healthy populations still occur in the south‐west. In many other areas, populations are isolated and fragmented and there is some evidence for continuing declines. In Wales the otter is rare or absent from the south and parts of the north. Healthy populations are present in the Highland Region of Scotland, on the north and west coasts and in the islands but there is evidence of a decline in the south and east‐central lowlands. Otters are widespread and common in Ireland which sustains the best of the known populations in Europe.Pollution by pesticides probably caused the initial rapid decline of the species but habitat destruction is increasingly important and where habitat is poor, human disturbance assumes greater significance. There is no evidence of competition with mink. The otter is now a protected species but if it is to recover some of its former range, remaining habitat must be retained.While otter populations have decreased over much of northern Europe, the animal survives, albeit somewhat precariously, in a few southern parts of the contin

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00260.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00261.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

AbstractIn a survey of Spain during June 1981, signs of otters were found at seventy (40%) of the 176 stations investigated. Otters were mainly concentrated in the mountainous north and north‐west and in the plains and mountains of the south‐west. Water pollution appears to be an important limiting factor in some ar

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

AbstractThe otter is common and widespread in northern Tunisia and the Oued Medjerda effectively represents a southern limit for the species. The distribution of otters is largely coincident with dense bankside cover, provided mainly byNerium oleander.Rivers south of the O. Medjerda offer little shelter for the animals.

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

AbstractThe Pine marten is now mainly confined to the woodland and scrub areas of the mid‐western region of Ireland (west of the river Shannon between Sligo and Limerick), though it was much more widespread in the country as recently as 50 years ago. It is suggested that this major reduction in the species' range can be attributed primarily to the continual loss and fragmentation of established woodland habitat. This resulted in a greater susceptibility of the species to predator control programmes, which included extensive poisoning campaigns and trapping to protect game and livestock. The survey recorded localized expansions of the species' range to occupy recently established conifer plantations, mostly on upland peat

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Book reviewed in this article:THE MAMMALIAN RADIATIONS. An analysis of trends in evolution, adaptation and behaviour. By John F. EisenbergTHE DESCENT OF MAN AND SELECTION IN RELATION TO SEX. By Charles DarwinTHE OXFORD COMPANION TO ANIMAL BEHAVIOUR. Edited by David McFarlandWRITING A SCIENTIFIC PAPER AND SPEAKING AT SCIENTIFIC MEETINGS. By Vernon BoothTHE WOLF: HIS PLACE IN THE NATURAL WORLD. By E. ZimenKEYS TO THE VERTEBRATES OF POLAND: MAMMALS. Edited by Z. PucekDOMESTICATED ANIMALS: A HISTORY FROM EARLY TIMES. By Juliet Clutton‐BrockETHOLOGY. ITS NATURE AND RELATIONS WITH OTHER SCIENCES. By R. A. HindePERSPECTIVES IN PRIMATE BIOLOGY. Edited by E. H. Ashton&R. L. HolmesPRIMATE EVOLUTIONARY BIOLOGY. Edited by A. B. Chiarelli&R. S. CorrucciniEAST AFRICAN MAMMALS: AN ATLAS OF EVOLUTION IN AFRICA. Vols. IIIc and Hid By Jonath

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1983.tb00266.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY