What does this research mean for the field?

Galápagos sea lions exhibit resilience to extreme climate variability through reproductive plasticity, but their continued population decline is driven by reduced recruitment and increased juvenile mortality rather than direct climate impacts or reduced female fecundity. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To analyze 21 years of pupping trends, maternal traits, and climate oscillations to determine the primary demographic drivers of long-term population decline in Galápagos sea lions.

September 3, 2026Behavioral EcologyOpen Access

Maternal flexibility in Galápagos Sea Lions mitigates climate impacts but not population decline

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Authors

ACAlexandra Childs CSClaire Stainfield SSSvenja Stoehr

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Overview

Long-term longitudinal study reveals maternal reproductive plasticity buffers climate variability in Galápagos sea lions, indicating population decline stems from reduced juvenile survival.

Key Points

To analyze 21 years of pupping trends, maternal traits, and climate oscillations to determine the primary demographic drivers of long-term population decline in Galápagos sea lions.
Monitored the Caamaño colony over a 21-year period (beginning in 2003) tracking pupping dates, pup survival to yearling age, body condition at birth, and maternal foraging strategies.
Assessed statistical associations between reproductive timing, climate variability, maternal parameters, and pup survival over time.
The Caamaño colony exhibited continuous population decline since 2003, with an accelerated rate observed after the 2010 reproductive season, alongside a significant shortening of the overall pupping period duration without a shift in median pupping date.
Maternal foraging strategies significantly influenced parturition timing, with male pups born significantly earlier than female pups, reflecting reproductive plasticity linked to environmental resource availability.
Pup survival to yearling age showed no significant temporal decline over the 21-year period, with survival positively influenced by birth body condition and juvenile colony presence, pointing to reduced post-yearling recruitment as the primary driver of population drop.

Cite This Study

Childs et al. (2026) studied this question.

synapsesocial.com/papers/6a9935f3636c6408cfa7e9f7 https://doi.org/10.1093/beheco/arag107

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September 3, 2026Behavioral EcologyOpen Access

Maternal flexibility in Galápagos Sea Lions mitigates climate impacts but not population decline

View Full Paper

Ask AI

Bookmark

Authors

ACAlexandra Childs CSClaire Stainfield SSSvenja Stoehr

Discussion

Member takes

Overview

Long-term longitudinal study reveals maternal reproductive plasticity buffers climate variability in Galápagos sea lions, indicating population decline stems from reduced juvenile survival.

Key Points

To analyze 21 years of pupping trends, maternal traits, and climate oscillations to determine the primary demographic drivers of long-term population decline in Galápagos sea lions.
Monitored the Caamaño colony over a 21-year period (beginning in 2003) tracking pupping dates, pup survival to yearling age, body condition at birth, and maternal foraging strategies.
Assessed statistical associations between reproductive timing, climate variability, maternal parameters, and pup survival over time.
The Caamaño colony exhibited continuous population decline since 2003, with an accelerated rate observed after the 2010 reproductive season, alongside a significant shortening of the overall pupping period duration without a shift in median pupping date.
Maternal foraging strategies significantly influenced parturition timing, with male pups born significantly earlier than female pups, reflecting reproductive plasticity linked to environmental resource availability.
Pup survival to yearling age showed no significant temporal decline over the 21-year period, with survival positively influenced by birth body condition and juvenile colony presence, pointing to reduced post-yearling recruitment as the primary driver of population drop.

Cite This Study

Childs et al. (2026) studied this question.

synapsesocial.com/papers/6a9935f3636c6408cfa7e9f7 https://doi.org/10.1093/beheco/arag107

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