Behavioral Ecology of Brachyuran Larvae

Brachyuran crab larvae exhibit a diverse suite of behaviours that underpin their survival, dispersal and settlement across estuarine and coastal habitats. Early zoeal stages employ vertical migrations to exploit surface currents for offshore transport, while later megalopal stages respond to chemical and physical settlement cues to locate suitable benthic substrates. Larval swimming capacity, sensory perception of salinity gradients, light regimes and hydrodynamic structures all interact to determine dispersal trajectories and patch formation. Behavioural variation within broods can lead to substantial differences in transport distance and recruitment success, with faster or more responsive individuals maintaining optimal depth positions under wind-driven or tidal flows. Predator avoidance tactics, such as rapid downward dives or creation of exclusion zones, further shape survival probabilities. Collectively, these behavioural strategies link physical oceanography and life-history transitions, with implications for fisheries management, habitat restoration and the resilience of crab populations under changing climate and coastal development pressures.

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Behavioral Ecology of Brachyuran Larvae publication trend

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Technical terms

Zoeae: Early planktonic larval stages of brachyuran crabs characterised by several moults before metamorphosis.

Megalopa: Transitional larval stage between zoea and juvenile crab during which settlement and metamorphosis occur.

Selective tidal stream transport: Behavioural strategy where larvae position vertically to exploit favourable tidal currents for dispersal and return.

Geotaxis: Orientation or movement of organisms in response to gravitational forces.

Hydrodynamic cues: Flow-related physical signals, such as shear and turbulence, that influence larval behaviour.

Settlement cues: Chemical or physical stimuli that induce larvae to settle and undergo metamorphosis.

References

1. Influences of brood-dependent behavioral variation on blue crab (Callinectes sapidus) larval transport in a wind-driven estuarine plume. Ecological Modelling (2023).
2. Swimming behavior of newly hatched larvae of six decapod species (Crustacea: Decapoda). Nauplius (2021).
3. Influence of natural settlement cues on the metamorphosis of fiddler crab megalopae, Uca vocator (Decapoda: Ocypodidae). Anais da Academia Brasileira de Ciências (2010).
4. Persistent Hydrodynamic Cues Elicit Orientation-Specific Behavioral Sensitivities and Kinematic Responses in Dispersed Crab Larvae. Frontiers in Marine Science (2020).