The sedge warbler is a vocal summer migrant that breeds in reed and sedge beds across Britain, with its welfare influenced by conditions in the Sahel wintering area and the quality of wetland edge habitats on breeding grounds.
Sedge warbler welfare is fundamentally linked to Sahel rainfall patterns that determine winter food availability and survival. The pre-migration fuelling strategy relying on plum reed aphid abundance is a welfare vulnerability if aphid crashes coincide with migration preparation. Wetland drainage reducing suitable breeding habitat increases the density of birds at remaining sites, raising competition and territorial stress. Climate change is altering both Sahel rainfall reliability and aphid emergence timing.