| Titre : | Population size, breeding biology and origins of Scottish Purple Sandpipers |
| Auteurs : | Rik D. Smith, Auteur ; Ron W. Summers, Auteur |
| Type de document : | Article |
| Dans : | British Birds (98(11) NOV 2005) |
| Article en page(s) : | 579-588 |
| Résumé : | The tiny population of Purple Sandpipers Calidris maritima breeding in the central Highlands of Scotland fluctuated between one and five pairs between 1978, when first discovered, and 2001. A detailed study was carried out between 1,987 and 1993 and the mean arrival date was 19th May. There were between one and three pairs in the main study area (c. 4 km(2)). Clutch size was four eggs in each of five nests monitored and the median hatch date was 27th June. All five clutches hatched, though two eggs failed (hatchability of 90%). A conservative estimate for productivity was about 0.9 fledged young per pair. In most cases, only the male attended the brood, though a female attended one brood while the male remained elsewhere in the territory. Adults, fledged young and broods were associated mainly with Three-leaved Rush Juncus trifidus, Stiff Sedge Carex bigelowii, and Rhacomitrium lanuginosum heaths and margins of streams, pools and flushes. The return rate for adults was 64.7% (se = 11.6%), but only one bird marked as a chick returned. Although based on small samples, the demographic parameters appear typical for small sandpipers, and the population has persisted for 25 years. The small area of Arctic/alpine habitat is perhaps restricting the size of the population. In the long term, climate change is a threat to montane birds in Scotland, including breeding Purple Sandpipers. Comparisons of measurements of adults and eggs with those for other breeding populations of Purple Sandpipers indicate that the Scottish birds originated from Norway. |
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