Movement and Survival of British Razorbills

Lloyd, Clare S.

doi:10.1080/00063657409476406

Cited by 29 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In every geographical region (Table I) first-year birds are more susceptible to being killed than are older birds (paired t-2.75, df =6, p<0.05), and are also more likely to be found exhausted (paired t=4.13, df =6, p<0.01). A similar greater susceptibility of young birds to being shot has been shown from ringing data by Lloyd (1974) and Birkhead (1974) for Razorbills Alca torda and Guillemots Uria aalge, but these authors failed to take into account the dispersion of different age groups which, in auks, result in more first-year birds reaching areas of high shooting intensity. However, a bias of shooting selecting young birds has been shown by Murton (1961) for the Woodpigeon Columba palumbus, and this is probably a widespread phenomenon.…”

Section: Causes Of Recoverymentioning

confidence: 73%

Movements and mortality rates of Great Skuas ringed in Scotland

Furness

1978

Bird Study

View full text Add to dashboard Cite

Section: Causes Of Recoverymentioning

confidence: 73%

Movements and mortality rates of Great Skuas ringed in Scotland

Furness

1978

Bird Study

View full text Add to dashboard Cite

“…Because natal dispersal is very limited, we have identified 13 fairly large breeding regions (Fig. This technique has been used to show that British Guillemots Uria aalge and Razorbills Alca torda are dispersive (Birkhead 1974, Lloyd 1974. Coulson and Brazendale (1968) discussed the difficulties in distinguishing between post-breeding season migratory and dispersive movements of adults and juveniles in species where there are no clear non-occupied zones between breeding and non-breeding areas and developed the parameter "r".…”

Section: Methodsmentioning

confidence: 99%

Regional Variations in the Dispersal Patterns of Shags Phalacrocorax aristotelis in Northern Europe

Galbraith¹,

Baillie²,

Furness³

et al. 1986

Ornis Scandinavica

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Wiley and Nordic Society Oikos are collaborating with JSTOR to digitize, preserve and extend access to Ornis Scandinavica. S. 1986. Regional variations in the dispersal patterns of Shags Phalacrocorax aristotelis in northern Europe.-Ornis Scand. 17: 68-74.Recoveries of Shags ringed at colonies in north Europe showed marked differences between regions in the timing and extent of dispersal from colonies outside the breeding season. In addition to differences between populations, age-related and annual variations occur. Whereas some populations were comparatively consistent in their year to year dispersal patterns and there were no age related differences, others, e.g. the Forth/Farnes, showed marked age related and annual variations. Populations on exposed coasts showed greater variation in dispesal between years, possibly due to influences of weather on food availability. For most populations, median winter movements were generally less than 100 km, and winter ranges of different breeding populations were relatively discrete. North Norwegian Shags apparently undergo migratory rather than dispersive movements but important biases may be included in the data. It is concluded that "eruptive" movements are merely the later stages in a graded response to deteriorating environmental conditions and the occurrence of such behaviour in different populations is determined by the availability of sheltered feeding conditions.

show abstract

“…This was similar to results from elsewhere which ranged from 81-96%. [13][14][15][16][17] In general, birds kept the same site and mate each year. There were 163 instances (involving 56 individuals) where a colour-ringed bird bred in one year and was sighted in the following year; in 150 (93%) of cases it bred at the same site, in 7 cases (4%) it bred at another site and in 6 cases (3%) it did not breed.…”

Section: Adult Survivalmentioning

confidence: 99%