Early larval stress reduces actuarial senescence in wild marine bryozoans
Extended larval periods lowered lifetime reproductive success in Bugula neritina but reduced the rate of actuarial senescence in the field.
Evolution letters · Morgan W et al. · Paper published 2 Jul 2026
In the colonial marine bryozoan Bugula neritina, early-life stress alters how individuals age in the wild. Researchers experimentally stressed larvae by extending their larval swimming period, imposing an energetic challenge. They then tracked more than 500 individuals across their entire lifetimes in the field, measuring survival, growth, and fecundity to evaluate both actuarial and reproductive senescence trajectories. The researchers observed clear declines in survival and reproduction among the oldest individuals, challenging theories that indeterminately growing colonial organisms show negligible senescence. Adults originating from stressed larvae suffered reduced overall lifetime reproductive success, but they experienced weaker actuarial senescence. The team also observed some evidence that early-life stress decreased rates of reproductive senescence.
Why it matters
The study demonstrates that indeterminately growing invertebrates experience senescence in natural environments. It also indicates that early-life adversity can paradoxically slow the rate of aging despite reducing lifetime fitness.
Caveats
The findings come from a single marine invertebrate species, and evidence for the reduction in reproductive senescence was more nuanced than the actuarial trends.
Written from the paper’s abstract, and every claim checked against it before publishing. Read the paper for the full methods and data.
The paper
Early-life stress reduces senescence in the field for an indeterminately growing ectotherm
Morgan W, Cameron H, Marshall D
Evolution letters · 2 Jul 2026 · Peer-reviewed
- Relevance
- Relevant
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- Notable
- Evidence
- Model organisms
- Status
- Peer-reviewed
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