Marmot alarm call acoustic analysis (Icteridae)

Knowledge graph centered on Marmot alarm call acoustic analysis (Icteridae) with 43 nodes and 133 connections. Top connected: Rocky Mountain Biological Laboratory, Gothic, Marmota, Yellow-bellied Marmot, Colorado East River Valley.

Method synopsis

Analysis of recorded alarm vocalizations for nonlinear acoustic phenomena including subharmonics, biphonation, deterministic chaos, entropy and goodness of pitch measures.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure as described in the canonical source

Steps below were extracted from the paper that introduces this protocol — Nonlinear phenomena in marmot alarm calls: a mechanism encoding fear? (2025), Philosophical Transactions of the Royal Society B. Implementations in other papers (listed below) may differ.

1. Record alarm vocalizations
   Alarm calls were recorded using directional microphones positioned at distance from vocalizing marmots. Calls were recorded both from naturally occurring predator encounters and trap-elicited situations when marmots were handled.
   Quantities: Multiple calls per individual across different risk situationsDuration: Ongoing throughout study periodConditions: During natural predator encounters and when marmots were trapped
   Equipment: directional microphones, recording equipment
2. Analyze acoustic structure
   Vocalizations were analyzed for nonlinear phenomena including subharmonics, biphonation, deterministic chaos, and warbles. Entropy and goodness of pitch measures were calculated to quantify call structure and 'noisiness'.
   Quantities: Analysis of hundreds of calls from multiple individualsDuration: Post-recording analysisConditions: Laboratory acoustic analysis
   Equipment: acoustic analysis software, spectrogram analysis tools

Typical Equipment

• directional microphones
• recording equipment
• acoustic analysis software

Output Measurements

• nonlinear acoustic features
• entropy measures
• pitch quality

Papers Using This Protocol (1)

Species Studied With This Protocol

Places Where Used