Fluctuations in neighbourhood fertility generate variable signalling effort

Area of Science:

• Animal behavior
• Ecology
• Bioacoustics

Background:

• Sexual signaling studies often focus on pairs, neglecting complex social networks.
• Understanding how animals adjust signals in social contexts is crucial but understudied.

Purpose of the Study:

• To investigate how male common yellowthroats modify song production in response to social environment changes.
• To determine if males adjust singing based on pair-bond status and neighboring female fertility.

Main Methods:

• Used autonomous recording devices to capture 118,472 songs from 26 male common yellowthroats over two breeding seasons.
• Conducted detailed surveys of social conditions on each territory.
• Correlated song production with within-pair social context and neighboring female fertility.

Main Results:

• Males significantly altered song output based on pair-bond status and neighboring female fertility (up to 400m).
• Song production decreased when mated, with variation influenced by time of day and mate's fertility.
• Song output increased when fertile females were present nearby, particularly during daytime.

Conclusions:

• Male common yellowthroats dynamically adjust sexual signaling effort in response to complex social cues.
• Changes in social environment, including mate and neighbor status, substantially influence male communication strategies.
• Further research is needed to elucidate the precise mechanisms (active information gathering vs. indirect effects) driving these signaling adjustments.