Adaptive switch from infanticide to parental care: how do beetles time their behaviour?

Area of Science:

• Behavioral Ecology
• Animal Behavior
• Insect Biology

Background:

• Temporal kin recognition is crucial in species where parents may commit infanticide.
• Accurate timing of offspring arrival is essential for parents to switch from infanticide to care.
• Mistakes in timing have significant fitness consequences for parents and offspring.

Purpose of the Study:

• To investigate the timing mechanism of the switch from infanticide to parental care in burying beetles.
• To determine if photic cues, specifically day length, influence this behavioral switch.
• To elucidate whether the timing is linked to oviposition or carcass access.

Main Methods:

• Manipulation of photic cues (day length) in the burying beetle Nicrophorus vespilloides.
• Altering light periods after carcass discovery and oviposition.
• Observing the timing of oviposition and the cessation of infanticide.

Main Results:

• The switch from infanticide to parental care in N. vespilloides is dependent on day-length inputs.
• Extended light periods after carcass discovery affected both oviposition and infanticide cessation timing.
• Light:dark cycle manipulation post-oviposition also influenced the timing of the parental care switch.

Conclusions:

• The timing mechanism for the infanticide-to-care switch is sensitive to photic cues and carcass presence, not solely oviposition.
• The behavioral switch is directly tied to this timing mechanism, independent of reproductive physiology changes.
• Circadian rhythm mechanisms may be co-opted for temporal assessment after carcass discovery in these beetles.