摘要:

AbstractData on various features influencing resource acquisition and allocation of energy in Soricidae are reviewed. The relationships between these features are examined at the three functional levels that constrain the energetic design of shrews: the maintenance of homeostasis (rate of metabolism and temperature regulation), the balancing of the energy budget (e.g. the influence of body mass, activity rate, various energy saving mechanisms and home range size), and the allocation of energy towards reproduction (e.g. the influence of litter size). Two major contradictory energetic designs may be recognized: one rather expensive design that is observed in cold and temperate climates with relatively predictable fluctuations in resource availability (e.g. inSorexandNeomys), and another much less expensive design that is observed mainly in warm or unpredictable environments (e.g. inCrocidura, SuncusandNotiosorex).It is speculated that climate and resource availability impose narrow limits on the evolution of these energetic strategies, mainly because of the small thermal inertia and reduced energetic autonomy of shrews.

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1988.tb00083.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1988.tb00084.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1988.tb00085.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractThe American MinkMustela visonwas first introduced into Ireland in 1951 for commercial fur–farming and has successfully established itself in the wild from escaped stock. Initial concentrations of feral populations were in the north, north–west and in the Midlands, with scattered introductions in the south–west of the country. Data on mink farming and the species' present distribution were gathered from all available sources, including a survey conducted during 1984–1986. The feral mink is now widespread throughout the island with the exception of major portions of western counties, which it is currently colonizing. Populations are stabilizing in established zones and, although there is a need for control measures in certain situations, the overall threat to the limited Irish fauna does not appear as great as initially feared. The spread of the American Mink in other European countries is reviewed

ISSN:0305-1838    

DOI:10.1111/j.1365-2907.1988.tb00086.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY