What the Hirta research population teaches
Knowledge for understanding and preserving Soay – British.
The University of Edinburgh’s St Kilda Soay Sheep Project studies vegetation on Hirta in March and August, capturing contrasting periods of winter scarcity and summer abundance. Researchers separate plant material, dry it and measure its mass at established sampling locations.
Its vegetation account describes a mosaic of closely grazed gaps and taller tussocks. Sheep numbers and grazing pressure affect how common these patches become; after a population decline, lighter grazing allows more plant material to accumulate.
These observations concern the free-living Hirta population. They are valuable ecological evidence, but they do not constitute a census of registered British Soay sheep in North America. The study shows a living interaction among sheep, season and food supply rather than a simple claim that a primitive breed can survive any stocking density without consequences.
Sources behind this article
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