What is the approximate male bias percentage found in ringed adult Willow Warblers in southeast England?

Answer

Roughly 60%

Demographic studies conducted on ringed adult Willow Warblers within areas experiencing low abundance, such as southeast England, have revealed an interesting and potentially detrimental finding regarding population structure: a significant male bias in the adult sex ratio. Analysis has indicated that males constitute roughly 60% of the adult population recorded in these declining regions recently. While males often exhibit slightly higher survival rates than females generally, this difference alone is insufficient to fully account for such a skewed ratio in these low abundance areas. Conservation advice stemming from this observation suggests focusing efforts on enhancing larger breeding sites where the sex ratio is closer to equality to maximize reproductive potential, as habitat fragmentation might be isolating smaller, male-dominated groups.

What is the approximate male bias percentage found in ringed adult Willow Warblers in southeast England?

Related Questions

What color are the legs that distinguish a Willow Warbler from a Chiffchaff?What is the description of the Willow Warbler contact call contrasted with the Chiffchaff's?What distance can eastern Siberian P. t. yakutensis cover annually?How many times per year does the Willow Warbler reportedly moult its feathers?What type of vegetation structure is critical for nesting security for Willow Warblers?What is the IUCN classification for the globally widespread Willow Warbler population?What common item weighs approximately the same as three Willow Warbler eggs?Where does the subspecies P. t. trochilus primarily winter?Which region within the British Isles showed stable or increasing Willow Warbler populations?What is the approximate male bias percentage found in ringed adult Willow Warblers in southeast England?
birdfaunaavianwarblersongbird