What is the peak breeding density recorded in Scandinavian countries for the Willow Warbler?
Answer
1,100 pairs per square kilometre
The text explicitly states that Scandinavian countries, specifically Sweden and Finland combined, support the highest population concentrations for the Willow Warbler. Local densities in this stronghold area were recorded reaching an astonishing peak of up to 1,100 pairs per square kilometre. This figure represents the maximum density cited anywhere within the species' range, contrasting sharply with lower densities mentioned for areas like Central Siberia (27 pairs/km²) or Switzerland (9 pairs/km²).
Related Questions
What is the peak breeding density recorded in Scandinavian countries for the Willow Warbler?What approximate percentage decrease in population has occurred in England over the last 25 years?Which tree species are essential vegetative components associated with Willow Warbler habitat preferences?What is the maximum migratory distance recorded for the Siberian subspecies, *P. t. yakutensis*?Where do Willow Warblers breeding in Western Siberia (*P. t. acredula*) typically spend their wintering period?Which Old World locations are documented sites for accidental, vagrant transatlantic or trans-Pacific Willow Warbler sightings?How is the Willow Warbler's song characterized in contrast to the Chiffchaff's abrupt call?What specific age structure of tree growth, often referred to as coppice, is suitable for the Willow Warbler?Which specific three UK locations in Leicestershire and Rutland are noted as productive sites for finding Willow Warblers during the summer season?What is the easternmost geographical boundary mentioned for the Willow Warbler's core summer breeding territory?What is the primary post-arrival behavior of Willow Warblers in their African wintering grounds?