Report on bird ringing in Britain and Ireland for 1994

Clark, Jacquie A.; Adams, Sue Y.; Peach, Will J.; Simons, Judith

doi:10.1080/03078698.1996.9674120

Cited by 11 publications

(4 citation statements)

References 65 publications

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“…There are two populations defined according to bill length: a short-billed population originating from Norway (based on ringing recoveries and comparisons between bill measurements) and a long-billed population probably from Canada (based only on biometrics) (Rae et al 1986, Nicoll et al 1988). There is a single ringing recovery from Svalbard (Clark et al 1996) but bill measurements from this breeding population do not form a peak in the bill size distribution from the winter population, suggesting that few winter in Scotland. Svalbard birds winter mainly in Scandinavia (Hake et al 1997).…”

mentioning

confidence: 84%

Numbers, migration phenology and survival of Purple SandpipersCalidris maritimaat Gourdon, eastern Scotland

Summers¹,

Nicoll²,

Peach³

2001

Bird Study

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mentioning

confidence: 84%

Numbers, migration phenology and survival of Purple SandpipersCalidris maritimaat Gourdon, eastern Scotland

Summers¹,

Nicoll²,

Peach³

2001

Bird Study

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“…The Ringing Scheme of the British Trust for Ornithology (BTO) has been run since 1909: birds have been ringed by volunteers in Britain and Ireland since this time (Clark et al, 1996). Recoveries are largely by members of the general public, often when they find dead birds.…”

Section: Methodsmentioning

confidence: 99%

Modeling large-scale dispersal distances

Paradis

Baillie

Sutherland

2002

Ecological Modelling

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We present an approach to analyse dispersal distance data. This approach allows one to take into account accuracy of the recorded dispersal distances. Three distributions were used, all assuming continuous space; a maximum likelihood approach was used for parameter estimation and model selection. Numerical simulations showed that our method is statistically consistent since it selected the correct model with increasing frequency when sample size increased. Ringing data on two species of tits (Parus caeruleus and P. major) in Britain and Ireland were used to illustrate the potentialities of our method. In both species, adults dispersed significantly further than juveniles. The differences between species within an age-class were not statistically significant. In all species and age-classes, the model finally selected was the one assuming a heavy-tailed half-Cauchy distribution where longdistance dispersers are predicted to be more frequent than in the exponential model. The proposed methodology can potentially be applied to any organisms, and the model selection procedure can be used with any model of the distribution of dispersal distances. Several extensions are presented in the discussion, such as generalized linear modelling of the dispersal parameters, or interfacing with capture-recapture models.

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“…Three sets of data were used for the analyses: population counts from the Common Birds Census (CBC, Marchant et al 1990), ringing recoveries from the BTO Ringing Scheme (Clark et al 1996), and individual nests data from the Nest Record Scheme (Crick and Baillie 1996). We used data collected from 1962 to 1994.…”

Section: Methodsmentioning

confidence: 99%

Exploring density‐dependent relationships in demographic parameters in populations of birds at a large spatial scale

Paradis

Baillie²,

Sutherland³

et al. 2002

Oikos

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The importance of density‐dependent processes in natural populations is widely accepted, but the issue of the shape of density‐dependent relationships (such as influenced by vagueness, or time‐delay) remains unresolved. We explored the density‐dependent relationships in demographic parameters for 12 species of birds in Britain using large‐scale, long‐term data sets. We predicted that a negative relation between density and demographic parameters should be observed for the stable species, whereas the decreasing or increasing species should display a positive relation if the environment changes progressively through time bringing about a continuous change in density dependence. Our prediction was verified for nine species out of 12; however, we observed, for the three remaining species, a significant decrease of survival rates through time that seems to be involved in a long‐term population decline. In all cases where a density‐dependent relation was found, we observed an important variance around the relation. In one case, we showed that this variance increased significantly with density. We found evidence for time‐delayed effects of density dependence both for survival and breeding performance. In two species, our results suggest the existence of complex interactions (compensatory mechanisms) between survival and breeding performance or between the different components of breeding performance.

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Report on bird ringing in Britain and Ireland for 1994

Cited by 11 publications

References 65 publications

Numbers, migration phenology and survival of Purple SandpipersCalidris maritimaat Gourdon, eastern Scotland

Numbers, migration phenology and survival of Purple SandpipersCalidris maritimaat Gourdon, eastern Scotland

Modeling large-scale dispersal distances

Exploring density‐dependent relationships in demographic parameters in populations of birds at a large spatial scale

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