Marsh tits are resident UK woodland birds facing long-term population declines linked to woodland management changes and habitat fragmentation.
Marsh tit welfare is strongly linked to habitat quality within small territories. Intensive woodland management removing deadwood eliminates foraging opportunities and nest sites. Disconnected woodland fragments trap individuals in suboptimal habitats where food shortage is chronic. Low reproductive success in degraded habitats means chick starvation is a recurring welfare cost. Woodland management that retains structural diversity and connectivity directly improves marsh tit welfare.