Monogamy without biparental care in a dwarf antelope

Area of Science:

• Evolutionary biology
• Mammalian reproductive strategies
• Behavioral ecology

Background:

• Monogamy in mammals is often explained by the necessity of biparental care for offspring survival.
• Without the need for biparental care, dominant males typically monopolize multiple females.

Purpose of the Study:

• To investigate the role of males in offspring survival in the monogamous Kirk's dik-dik (Madoqua kirkii).
• To test proposed hypotheses for mammalian monogamy, focusing on male contributions to resource defense, infanticide prevention, and predation risk reduction.

Main Methods:

• Observational study of Kirk's dik-dik behavior and interactions.
• Testing hypotheses related to resource defense, infanticide risk, and predator detection.
• Playback experiments using predator calls to assess male and female responses.

Main Results:

• Male dik-diks do not defend resources for their mates or offspring, as territorial defense is sex-specific.
• No evidence of infanticide risk from males was found; males did not target infants they did not sire.
• Males did not significantly reduce predation risk for females or offspring; only mothers responded to predator calls targeting juveniles.

Conclusions:

• This study presents the first conclusive evidence for the absence of paternal care in any monogamous mammal.
• The evolution of monogamy in Kirk's dik-dik may not be linked to biparental care, challenging existing theories.
• Further research is needed to understand the evolutionary drivers of monogamy in species lacking paternal investment.