Showing papers by "Royal Society for the Protection of Birds published in 1987"
TL;DR: In this paper, a land-use study of 16 000 ha of the coastal zone between Clacton-on-Sea in the north to Burnham-onCrouch in the south showed that between 1938 and 1981, the area of coastal grassland decreased from 11749 ha to 2083 ha, a reduction of 9666 ha (82%).
25 citations
TL;DR: It is suggested that the increased reproductive effort coincides with an increase in breeding success, and pairs at altitudes over 300 m bred significantly later than those at lower altitudes.
Abstract: We studied the abundance, reproductive performance and diet of breeding Grey Wagtails on rivers in mid and south Wales between 1978 and 1985. Breeding abundances ranged from 0 to 15 pairs per 10 km. Birds were commonest on hard water streams with abundant aquatic invertebrates and they appeared to favour streams lined by deciduous trees. Most females probably started to lay in April but replacement and subsequent clutches extended the breeding season into July. Median laying dates varied annually and were correlated with the mean air temperature in March. Pairs at altitudes over 300 m bred significantly later than those at lower altitudes. Fifty-two per cent of nesting attempts produced fledged young. The mean size of 147 clutches was 5.07. Clutches started in May were significantly larger than those started in April or June. We suggest that the increased reproductive effort coincides with an increase in breeding success. Adults and nestlings had similar diets in terms of insect orders: Trichoptera, Ephem...
19 citations
TL;DR: O'Connor and Shrubb as mentioned in this paper discuss farming and birds in their book "Farming and Birds: A Farming and Birds' Guide" (1986), with a focus on birds.
Abstract: Farming and Birds. By Raymond J. O'Connor andMichael Shrubb. Cambridge University Press: 1986. Pp.290. £17.50, $34.50.
1 citations