Escape-hatching decisions show adaptive ontogenetic changes in how embryos manage ambiguity in predation risk cues

Jung, Julie; McDaniel, J. Gregory; Warkentin, Karen M.

doi:10.1007/s00265-021-03070-9

Cited by 8 publications

(2 citation statements)

References 103 publications

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“…In such cases, as with behavioral decisions at later life stages, assessment or cue-sampling costs may also affect the decision process and timing (Warkentin et al, 2007). Moreover, developmental changes in the costs of missed cues or false alarms may select for ontogenetic adaptations in assessment and decision strategies (Jung et al, 2021; Warkentin et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Ontogeny of risk assessment and escape-hatching performance by red-eyed treefrog embryos in two threat contexts

Güell

Jung

Almanzar

et al. 2022

Preprint

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Arboreal embryos of red-eyed treefrogs, Agalychnis callidryas, hatch prematurely in response to hypoxia when flooded and mechanosensory cues (MC) in snake attacks, but hatching later improves tadpole survival. We studied ontogenetic changes in risk assessment and hatching performance of embryos in response to flooding and physical disturbance. We hypothesized that risk assessment decreases as hatchling survival improves and hatching performance increases as embryos develop. Because snakes eat faster than embryos asphyxiate, we hypothesized that embryos decide to hatch sooner and hatch faster in response to MC. We video-recorded individual embryos hatching in response to each cue type, then compared the incidence and timing of a series of events and behaviors from cue onset to complete hatching across ages and stimuli. Latency from cue to hatching decreased developmentally in both contexts and was shorter with MC, but the elements contributing to those changes differed. Hypoxia-assessment involved position changes, which decreased developmentally along with assessment time. MC-assessment was passive, faster, and also decreased with age. The first stages of hatching, membrane rupture and head emergence, were surprisingly age-independent but faster with MC, congruent with greater effort under more immediate risk. In contrast, body emergence and compression showed ontogenetic improvement consistent with morphological constraints but no cue effect. Both appropriate timing and effective performance of hatching are necessary for continued development. Different stages of the process vary with development and environmental context, suggesting combinations of adaptive context- and stage-dependent behavior, cue-related constraints on information acquisition, and ontogenetic constraints on elements of performance.Summary statementDevelopment reduces risk assessment and improves hatching performance by red-eyed treefrog embryos in both flooding and simulated attacks. Predation cues elicit faster decisions and hatching, congruent with more immediate risk.

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Section: Discussionmentioning

confidence: 99%

Ontogeny of risk assessment and escape-hatching performance by red-eyed treefrog embryos in two threat contexts

Güell

Jung

Almanzar

et al. 2022

Preprint

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“…synchronized hatching with siblings [12][13][14], or favourable conditions for development within or outside the egg [15][16][17]) associated with hatching. Nevertheless, for immobile embryos in which sensory systems have not yet fully developed and where only limited information is available regarding the external environment, reliably detecting environmental cues and weighing the risks and opportunities of transitioning between life stages is inherently challenging [18,19].…”

Section: Introductionmentioning

confidence: 99%

Paternal care regulates the timing, synchrony and success of hatching in a coral reef fish

et al. 2022

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In oviparous species, the timing of hatching is a crucial decision, but for developing embryos, assessing cues that indicate the optimal time to hatch is challenging. In species with pre-hatching parental care, parents can assess environmental conditions and induce their offspring to hatch. We provide the first documentation of parental hatching regulation in a coral reef fish, demonstrating that male neon gobies ( Elacatinus colini ) directly regulate hatching by removing embryos from the clutch and spitting hatchlings into the water column. All male gobies synchronized hatching within 2 h of sunrise, regardless of when eggs were laid. Paternally incubated embryos hatched later in development, more synchronously, and had higher hatching success than artificially incubated embryos that were shaken to provide a vibrational stimulus or not stimulated. Artificially incubated embryos displayed substantial plasticity in hatching times (range: 80–224 h post-fertilization), suggesting that males could respond to environmental heterogeneity by modifying the hatching time of their offspring. Finally, paternally incubated embryos hatched with smaller yolk sacs and larger propulsive areas than artificially incubated embryos, suggesting that paternal effects on hatchling phenotypes may influence larval dispersal and fitness. These findings highlight the complexity of fish parental care behaviour and may have important, and currently unstudied, consequences for fish population dynamics.

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Research Approaches in Mechanosensory-Cued Hatching

Warkentin

Jung

McDaniel

2022

Biotremology: Physiology, Ecology, and Evolution

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Escape-hatching decisions show adaptive ontogenetic changes in how embryos manage ambiguity in predation risk cues

Cited by 8 publications

References 103 publications

Ontogeny of risk assessment and escape-hatching performance by red-eyed treefrog embryos in two threat contexts

Ontogeny of risk assessment and escape-hatching performance by red-eyed treefrog embryos in two threat contexts

Paternal care regulates the timing, synchrony and success of hatching in a coral reef fish

Research Approaches in Mechanosensory-Cued Hatching

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