Dispersal and site fidelity in Lesser Whitethroats<i>Sylvia curruca</i>

Norman, S. C.

doi:10.1080/03078698.1992.9674039

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Nottinghamshire is one of the counties where Woodlark numbers have risen considerably since recolonisation in the mid-1980s. The 56% decline in the number of Lesser Whitethroats ringed is perhaps not surprising for a species whose numbers are known to fluctuate widely from year-to-year (Norman 1992). Figures from other BTO surveys for 1997 also show a similar decline for this species (CBC plots showed a 45% decline and a 48% decline in the number of juveniles was recorded from CES sites).…”

Section: Numbers Of Birds Ringedmentioning

confidence: 67%

Bird ringing in Britain and Ireland in 1997

Toms

Clark

Balmer

1999

Ringing & Migration

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This is the 61st annual report of the British Trust for Ornithology's Ringing Scheme, presenting research carried out and data received in 1997. Work examining the survival rates of 31 farmland passerines in relation to longterm changes in abundance suggested that changes in survival rates for 16 species had, to some extent, influenced their abundance. This was particularly important for a number of declining species. Other research examined the post-release survival of oiled, cleaned and rehabilitated Guillemots and demonstrated that these Guillemots had lower annual survival rates than non-oiled, non-rehabilitated birds. Important recommendations about the future monitoring of the effects of rehabilitating oiled seabirds were made as a result of this work. A review of avian survival rates was also carried out in 1997, which brought together reliable survival rates for 115 species. The successful launch of the Retrapping Adults for Survival (RAS) Project is reported, together with an outline of its methods. This project aims to gather important data on the survival of a wide range of species in the UK, using targeted trapping for specific species and markrecapture analyses. Data collected from the Constant Effort Sites (CES) Scheme indicated that the 1997 breeding season was better than that in 1996 for the majority of passerine species monitored. However, significantly fewer adult birds were caught at Constant Effort (CE) sites in 1997 than in 1996 for four resident insectivores (Wren, Robin, Blackbird and Song Thrush), one resident seed-eater (Bullfinch) and three trans-Saharan migrants (Sedge Warbler, Reed Warbler and Whitethroat). The declines in adult numbers for four of the 'Red-listed' species (Song Thrush, Linnet, Bullfinch and Reed Bunting) continued. Long-term declines in adult catches of Blackbird and Song Thrush on CE sites were found to be similar, possibly suggesting similar causal factors. The value of the CES Scheme was further demonstrated by a new analysis examining long-term trends in abundance of species monitored on CE sites. Comparison of these trends with those from other monitoring schemes (eg Common Birds Census) highlighted the confidence that can be placed in such survey methods, together with the tremendous conservation value of these schemes. The number of birds ringed in 1997 (800,362) was 6% down on the total for 1996 and 5% down on the five-year average for 1992-1996. The number of 'Red-listed' Birds of Conservation Concern species ringed in 1997 was down by 7% on the fiveyear mean, while the number of 'Amber-listed' species was down by 8%. The recovery total (11,210) is the lowest since 1972, and possible reasons for this are discussed. Recoveries of 122 BTO-ringed birds and 61 birds ringed abroad are presented in the report, including a number of significant movements of an unusual nature. Particularly noteworthy were: (i) the movement of a Cormorant from Essex to Tunisia, (ii) the movement of a Red Kite (descended from the re-introduction programme) from Scotland to Iceland a...

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Section: Numbers Of Birds Ringedmentioning

confidence: 67%

Bird ringing in Britain and Ireland in 1997

Toms

Clark

Balmer

1999

Ringing & Migration

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Report on bird ringing in Britain and Ireland for 1992

Mead

Clark

Peach

1993

Ringing & Migration

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This is the 56th annual report of the British Trust for Ornithology's Ringing Scheme. The total number of birds ringed in 1992 (783, 842) was 0.4% lower than in 1991 and lower than in any year since 1982. Breeding populations of many species remained at a low level. The number of recoveries (12,200) was also low, indicative of mild weather conditions through the year. The previous report contained five-yearly summaries so the current one concentrates solely on the data acquired during 1992. Data were provided by 122 Constant Effort Sites in 1992. Forty-three papers wholly or partly based on ringing were published during the year. Staff research effort during the year was particularly concerned with further development of the Integrated Population Monitoring Programme. The age-specific totals lists, completed by ringers since 1985, were used to estimate first-year and adult survival rates for 16 species. Other research included a study of the reporting probability of ringed birds and further work on the cold weather mortality of waders on the Wash during February 1991. Mass-participation ringing in Senegal, in both spring and autumn, has resulted in further controls of BTO-ringed birds there and the report contains data on birds ringed in Senegal and reported in Britain and Ireland.

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Dispersal and site fidelity in Lesser WhitethroatsSylvia curruca

Cited by 6 publications

References 10 publications

Bird ringing in Britain and Ireland in 1997

Bird ringing in Britain and Ireland in 1997

Report on bird ringing in Britain and Ireland for 1992

Dispersal and return rates of Willow WarblersPhylloscopus trochilusin relation to age, sex and season

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