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4. Bird ringing in Britain and Ireland in 2008

Author

Coiffait, Liz, primary, Clark, Jacquie A., additional, Robinson, Robert A., additional, Blackburn, Jeremy R., additional, Grantham, Mark J., additional, Leech, Dave I., additional, Marchant, John H., additional, Barber, Lee J., additional, De Palacio, Diana, additional, Griffin, Bridget M., additional, Moss, Dorian, additional, and Shephard, Miranda M., additional

Published
2009
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6. Bird ringing in Britain and Ireland in 2007

Author

Coiffait, Liz, primary, Clark, Jacquie A., additional, Robinson, Robert A., additional, Blackburn, Jeremy R., additional, Grantham, Mark J., additional, Marchant, John H., additional, Barber, Lee, additional, De Palacio, Diana, additional, Griffin, Bridget M., additional, and Moss, Dorian, additional

Published
2008
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8. Bird ringing in Britain and Ireland in 2005

Author

Clark, Jacquie A., primary, Robinson, Robert A., additional, Adams, Sue Y., additional, Grantham, Mark J., additional, Risely, Kate, additional, Balmer, Dawn E., additional, Blackburn, Jeremy R., additional, Griffin, Bridget M., additional, Marchant, John H., additional, and Kimmel, Viola, additional

Published
2007
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9. Bird ringing in Britain and Ireland in 2004

Author

Clark, Jacquie A., primary, Robinson, Robert A., additional, Balmer, Dawn E., additional, Blackburn, Jeremy R., additional, Grantham, Mark J., additional, Griffin, Bridget M., additional, Marchant, John H., additional, Risely, Kate, additional, and Adams, Sue Y., additional

Published
2005
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14. Numbers of nesting Rooks Corvus frugilegus in the United Kingdom in 1996.

Author

Marchant, John H.

Abstract

In spring 1996, a nationwide census of nesting Rooks was carried out by the British Trust for Ornithology, under contract to the Department of the Environment (now the Department of the Environment, Transport and the Regions). Volunteers were asked to count Rook nests in 1997 2 × 2-km tetrads selected randomly throughout the UK. Full coverage or a valid nil return was reported for 96% of the sample tetrads, allowing the data to be treated as representative of the UK. Extrapolation from the survey's 3% sample allowed estimation, with confidence limits, of national and regional population sizes. The UK Rook population in 1996 was estimated at 1.27 million nesting pairs. This is about 40% higher than was estimated from a survey in 1975-77, but there were fewer Rooks nesting in Britain than in 1944-46. Both the direction and the scale of recent increase were supported by an analysis of change in 644 tetrads surveyed both in 1975-77 and in 1996. National data and those from local surveys suggested that population changes had not been uniform across the UK, but change estimates were partly dependent on assumptions about the thoroughness of coverage in 1975-77, and some estimates of increase may be too high. Rates of tetrad occupancy were highest in southwest England and Northern Ireland, but low in Scotland, although Scottish rookeries were more than twice as large on average as those in any other UK region. Mean rookery sizes in Britain were larger than in 1975-77, especially in England, but smaller in Northern Ireland. In all regions, however, population increase had occurred at least partly by an increase in the number of rookeries. Since 1975-77, English Rooks have shifted from elms as nesting trees to oaks and Ash, while conifer usage in Scotland, Wales and Northern Ireland appears to have decreased. The reasons for recent population increase are not known, but in some areas may stem from additional foraging opportunities provided by new outdoor piggeries... [ABSTRACT FROM AUTHOR]

Published
1999
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15. An Electrical-Resistance Method of Determining the Mean Surface Temperature of Tubes

Author

Marchant, John H.

Abstract

The author describes a new method for determining the mean surface temperature of condenser tubes through which a steady radial flow of heat occurs. The method consists in using the tube itself as a resistance thermometer. The author explains that when a steady longitudinal flow of electricity is superimposed upon the given radial flow of heat, the actual current being so small as not to involve appreciable Joulean heat, the temperature gradients associated with the flow of heat affect the electrical resistance of the tube material, and expressions for the mean temperature of the inner and outer tube surfaces can be derived from applications of physical laws. These expressions are derived by the author.

Published
1937
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