Tracking cryptic animals using acoustic multilateration: A system for long-range wolf detection.

The study of animal behavior in the wild requires the ability to locate and observe animals with the minimum disturbance to their natural behavior. This can be challenging for animals that avoid humans, are difficult to detect, or range widely between sightings. Global Positioning System (GPS) collars provide one solution but limited battery life, and the disturbance to the animal caused by capture and collaring can make this impractical in many applications. Wild wolves Canis lupus are an example of a species that is difficult to study in the wild, yet are of considerable conservation and management importance. This manuscript presents a system for accurately locating wolves using differences in the time of arrival of howl vocalizations at multiple recorders (multilateration), synchronized via GPS. This system has been deployed in Yellowstone National Park for two years and has recorded over 1200 instances of howling behavior. As most instances of howling occur at night, or when human observers are not physically present, the system provides location information that would otherwise be unavailable to researchers. The location of a vocalizing animal can, under some circumstances, be determined to within an error of approximately 20 m and at ranges up to 7 km.

[1]  Brian Otis,et al.  A novel digital telemetry system for tracking wild animals: a field test for studying mate choice in a lekking tropical bird , 2012 .

[2]  Hjalmar S. Kühl,et al.  Passive acoustic monitoring reveals group ranging and territory use: a case study of wild chimpanzees (Pan troglodytes) , 2016, Frontiers in Zoology.

[3]  David R. Wilson,et al.  Field test of an affordable, portable, wireless microphone array for spatial monitoring of animal ecology and behaviour , 2012 .

[4]  Marco Apollonio,et al.  Visualizing sound: counting wolves by using a spectral view of the chorus howling , 2015, Frontiers in Zoology.

[5]  Arik Kershenbaum,et al.  An image processing based paradigm for the extraction of tonal sounds in cetacean communications. , 2013, The Journal of the Acoustical Society of America.

[6]  W. Ripple,et al.  Large predators and trophic cascades in terrestrial ecosystems of the western United States , 2009 .

[7]  A. T. Cringan,et al.  SIREN-ELICITED COYOTE VOCALIZATIONS: AN EVALUATION OF A CENSUS TECHNIQUE , 2016 .

[8]  Daniel J. Mennill,et al.  Eavesdropping and communication networks revealed through playback and an acoustic location system , 2008 .

[9]  A. Thode,et al.  PAMGUARD : SEMIAUTOMATED , OPEN SOURCE SOFTWARE FOR REAL-TIME ACOUSTIC DETECTION AND LOCALISATION OF CETACEANS , 2008 .

[10]  Joydeep Ghosh,et al.  Under Consideration for Publication in Knowledge and Information Systems Generative Model-based Document Clustering: a Comparative Study , 2003 .

[11]  Rory P. Wilson,et al.  Trends and perspectives in animal‐attached remote sensing , 2005 .

[13]  F. Cagnacci,et al.  Animal ecology meets GPS-based radiotelemetry: a perfect storm of opportunities and challenges , 2010, Philosophical Transactions of the Royal Society B: Biological Sciences.

[14]  Douglas L. Jones,et al.  Blind location and separation of callers in a natural chorus using a microphone array. , 2009, The Journal of the Acoustical Society of America.

[15]  Vicente Palacios,et al.  Monitoring wolf populations using howling points combined with sign survey transects , 2005 .

[16]  Kathryn T. A. Lambert,et al.  A low-cost, yet simple and highly repeatable system for acoustically surveying cryptic species , 2014 .

[17]  Hervé Glotin,et al.  Bird detection in audio: A survey and a challenge , 2016, 2016 IEEE 26th International Workshop on Machine Learning for Signal Processing (MLSP).

[18]  D K Mellinger,et al.  Recognizing transient low-frequency whale sounds by spectrogram correlation. , 2000, The Journal of the Acoustical Society of America.

[19]  Walter M. X. Zimmer,et al.  Passive Acoustic Monitoring of Cetaceans: Cetacean sounds , 2011 .

[20]  David B. Law,et al.  DARPA counter-sniper program: Phase 1 Acoustic Systems Demonstration results , 1997, Defense + Security Symposium.

[21]  Christopher W. Clark,et al.  Distribution and Behavior of the Bowhead Whale , Balaena mysticetus , Based on Analysis of Acoustic Data Collected During the 1993 Spring Migration off Point Barrow , Alaska , 2001 .

[22]  Charles E. Taylor,et al.  Acoustic 3D localization of a tropical songbird , 2013, 2013 IEEE China Summit and International Conference on Signal and Information Processing.

[23]  Morgane Papin,et al.  Acoustic localization at large scales: a promising method for grey wolf monitoring , 2018, Frontiers in Zoology.

[24]  Christopher W. Clark,et al.  Comparative analysis of localization algorithms with application to passive acoustic monitoring. , 2013, The Journal of the Acoustical Society of America.

[25]  Chris J. Johnson,et al.  Expectations and realities of GPS animal location collars: results of three years in the field , 2002, Wildlife Biology.

[26]  J. Blanco.  Surveying wolves without snow: a critical review of the methods used in Spain , 2011 .

[27]  L. David Mech,et al.  Wolf pack spacing: Howling as a territory-independent spacing mechanism in a territorial population , 1983, Behavioral Ecology and Sociobiology.

[28]  L. Mech,et al.  An analysis of howling response parameters useful for wolf pack censusing , 1982 .

[29]  Marco Apollonio,et al.  Non-invasive acoustic detection of wolves , 2017 .

[30]  Andreas M. Ali,et al.  Acoustic monitoring in terrestrial environments using microphone arrays: applications, technological considerations and prospectus , 2011 .

[31]  Karl-Heinz Frommolt,et al.  Applying bioacoustic methods for long-term monitoring of a nocturnal wetland bird , 2014, Ecol. Informatics.

[32]  M. Boyce,et al.  WOLVES INFLUENCE ELK MOVEMENTS: BEHAVIOR SHAPES A TROPHIC CASCADE IN YELLOWSTONE NATIONAL PARK , 2005 .

[33]  R. D. Hayes,et al.  Wolves and Humans , 2003 .

[34]  T. Fuller,et al.  Evaluation of a Simulated Howling Survey for Wolves , 1988 .

[35]  Rory P. Wilson,et al.  Measuring devices on wild animals: what constitutes acceptable practice? , 2006 .

[36]  Daniel J. Mennill,et al.  Comparison of manual and automated methods for identifying target sounds in audio recordings of Pileated, Pale-billed, and putative Ivory-billed woodpeckers , 2009 .

[37]  Carel P van Schaik,et al.  Validation of an acoustic location system to monitor Bornean orangutan (Pongo pygmaeus wurmbii) long calls , 2015, American journal of primatology.

[38]  Matthias Zeppelzauer,et al.  Towards an automated acoustic detection system for free-ranging elephants , 2015, Bioacoustics.

[39]  Mohammed Bahoura,et al.  Acoustic detection and localization of whales in bay of fundy and St. Lawrence estuary critical habitats , 2004 .

[40]  Alex K. Piel,et al.  Savanna Sounds : : Using Remote Acoustic Sensing to Study Spatiotemporal Patterns in Wild Chimpanzee Loud Vocalizations in the Issa Valley, Ugalla, Western Tanzania , 2014 .