Bird population trends as shown by chick ringing data

Mason, C. F.; Hussey, Andrew

doi:10.1080/03078698.1984.9673839

Cited by 9 publications

(8 citation statements)

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“…There may, however, be other natural factors, such as disease, of which we know nothing: there is some evidence to suggest that the decline of the song thrush may have begun before agricultural change became a major force in the environment (Mason & Hussey, 1984;Marchant et al, 1990). There may, however, be other natural factors, such as disease, of which we know nothing: there is some evidence to suggest that the decline of the song thrush may have begun before agricultural change became a major force in the environment (Mason & Hussey, 1984;Marchant et al, 1990).…”

Section: Discussionmentioning

confidence: 99%

“…The changes in the agricultural environment have been so immense that they are readily implicated in declines of species such as the song thrush. There may, however, be other natural factors, such as disease, of which we know nothing: there is some evidence to suggest that the decline of the song thrush may have begun before agricultural change became a major force in the environment (Mason & Hussey, 1984;Marchant et al, 1990). Whatever the causes, the song thrush in this part of eastern England now appears to be largely restricted to woodlands and gardens.…”

Section: Discussionmentioning

confidence: 99%

“…However, the Common Birds Census (CBC) conducted by the British Trust for Ornithology since 1962 has shown a decline in song thrush populations both in woodland and in farmland habitats, especially since the 1970s (Marchant et al, 1990). The decline possibly began at least as early as the 1950s, as shown by an analysis of the annual number of nestlings ringed (Mason & Hussey, 1984). Thus the beginning of the decline may have pre-dated major agricultural changes, such as the widespread introduction of pesticides, the simpli®cation of landscape elements within farmland, and changes in cropping practices, all of which might have been expected to have adversely in¯uenced populations.…”

Section: Introductionmentioning

confidence: 99%

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Habitats of the song thrush Turdus philomelos in a largely arable landscape

Mason

1998

Journal of Zoology

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During three breeding seasons, 1994±96, the habitats of song thrushes were studied in north-east Essex, U.K., in 10 tetrads (total 40 km 2 ) of mainly farmland habitat and 35 woods of differing sizes (range 0.1± 57.0 ha). Within tetrads, only 6 (3.5%) territories were found in farmland. Gardens held 123 (71.5%) territories, though this habitat made up only 2% of the total area, while 39 (22.7%) were in woodlands (1% of total area). Population densities were much lower in the tetrads than in earlier studies; this may be an indication of the severe population decline that the species has recently undergone. Densities in gardens differed less from those of previous studies.In the woodland study, the number of woods holding song thrush territories declined over the three years, while the proportion of total territories in the six largest woods increased. Densities in the woods were lower than those reported in earlier studies but the disparity was not as great as in farmland. Extinctions in the smaller woods was 20±30% per annum, a rate similar to that for gardens: population extinctions did not occur in the larger woods.Some 40% of non-garden territories in the surveys of both tetrads and woodland plots were within 100 m of a garden. Gardens may be currently acting as a refuge for song thrushes and an understanding of the ecology of the species in different types of gardens may be important in current conservation efforts for the species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Habitats of the song thrush Turdus philomelos in a largely arable landscape

Mason

1998

Journal of Zoology

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“…They found that there was some recent surveillance of numbers of the great majority of species from various sources, but they did not consider methods which involve ringing. Information on the numbers of birds ringed relative to ringing effort have been used to create indices of population size (eg Mason & Hussey 1984). These can be used to estimate population trends over periods prior to the beginning of current census programmes.…”

Section: The Contribution Of Data From Ringingmentioning

confidence: 99%

Diagnosing the causes of bird population declines using comparative methods: The value of data from ringing

Green

1999

Ringing & Migration

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“…Age ratios has been estimated (e.g. Ginn 1969, Hjort & are also determined to assess annual changes Lindholm 1978, Barlein 1981, O'Connor & in productivity, and survival is calculated Mead 1984, Mason & Hussey 1984. from retrap rates.…”

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confidence: 99%