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Automated Detection of Rare and Endangered Anurans Using AUTOMATED DETECTION OF RARE AND ENDANGERED ANURANS USING ROBUST AND RELIABLE DETECTION SOFTWARE by Andrew Rance MacLaren, BS A thesis submitted to the Graduate Council of Texas State University in partial fulfillment of the requirements for the degree of Master of Science with a Major in Biology August 2015 Committee Members: Michael R.J. Forstner Shawn F. McCracken Floyd W. Weckerly COPYRIGHT by Andrew Rance MacLaren 2015 FAIR USE AND AUTHOR’S PERMISSION STATEMENT Fair Use This work is protected by the Copyright Laws of the United States (Public Law 94-553, section 107). Consistent with fair use as defined in the Copyright Laws, brief quotations from this material are allowed with proper acknowledgment. Use of this material for financial gain without the author’s express written permission is not allowed. Duplication Permission As the copyright holder of this work I, Andrew Rance MacLaren, refuse permission to copy in excess of the “Fair Use” exemption without my written permission. ACKNOWLEDGEMENTS I would like to express my thanks to Dr. Michael R. J. Forstner for his willingness to take me on as his responsibility, a task for which many would call him brave. Without his knowledge and experience I would not have been able to follow through with this process. From the onset of our professional relationship I was privy to the limits of Dr. Forstner’s patience and expectations, and with this work I am confident that I have exceeded them both. Yet through it all, I never sensed doubt from him, for that I am very thankful. I must thank Dr. Shawn F. McCracken who gave me the confidence to achieve an education beyond my baccalaureate. He has been the most critical sounding board throughout my research, and is simply the best professor I have ever had. Thank you for seeing something in me that I was unable to see in myself. I am also thankful for the patience and guidance of Dr. Floyd W. Weckerly, who agreed to participate as a committee member. His input has elevated the quality of my work by orders of magnitude. The Forstner Lab members deserve thanks, namely Zachary Adcock, who has consistently been a fountain of great ideas and good advice. Finally, I must thank all the friends and family that have shown support for my ambitions throughout this journey. Also, a very special thanks to my Grandparents, Lois and Ron Duquette, for your continued love and support throughout my adventures, whatever they may be. iv TABLE OF CONTENTS Page ACKOWLEDGEMENTS .................................................................................................. iv LIST OF TABLES ............................................................................................................. vi LIST OF FIGURES .......................................................................................................... vii ABSTRACT ....................................................................................................................... ix CHAPTER I. DEVELOPMENT OF RECOGNITION TOOLS FOR INCORPORATION WITHIN SONG SCOPE (©WILDLIFE ACOUSTICS) AUDIO ANALYTICAL SOFTWARE ............................................................................................................1 Introduction ......................................................................................................1 Materials and Methods .....................................................................................4 Results ..............................................................................................................9 Discussion ......................................................................................................11 II. COMPARING EFFICACY OF AUTOMATED DETECTION SOFTWARE VERSUS A TRAINED RESEARCHER ...............................................................23 Introduction ....................................................................................................23 Methods ..........................................................................................................24 Results ............................................................................................................25 Discussion ......................................................................................................26 III. CHARACTERIZING THE CALLING ACTIVITY OF THE HOUSTON TOAD GRAPHICALLY ...................................................................................................32 Introduction ....................................................................................................32 Methods ..........................................................................................................33 Results ............................................................................................................34 Discussion ......................................................................................................35 IV. CONCLUSION ......................................................................................................41 LITERATURE CITED ......................................................................................................43 v LIST OF TABLES Table Page 1.1 Performance of Houston Toad (Bufo houstonensis) recognizer during self identification tests ........................................................................................................15 1.2 Changes in parameterization of recognizer for Houston Toad (Bufo houstonensis) ...16 1.3 Parameters held constant during recognizer for Houston Toad (Bufo houstonensis) development ................................................................................................................17 3.1 Variable loadings from principal components analysis of Houston Toad (Bufo houstonensis) calling activity. ......................................................................................37 3.2 Comparison of observed conditions of Houston Toad (Bufo houstonensis) chorusing to parameters within USFWS protocol. .......................................................................37 vi LIST OF FIGURES Figure Page 1.1 Map of Texas showing Bastrop and Robertson counties, Texas, (in context) .............18 1.2 Map of area monitored for Houston Toad (Bufo houstonensis) within Bastrop County, Texas ............................................................................................................................19 1.3 Map of area monitored for Houston Toad (Bufo houstonensis) within Robertson County, Texas. .............................................................................................................20 1.4 Spectrographic annotation of a Houston Toad (Bufo houstonensis) vocalization in Song Scope Software (©Wildlife Acoustics). .............................................................21 1.5 Spectrographic of potential false negative of a Houston Toad (Bufo houstonensis) vocalization in Song Scope Software (©Wildlife Acoustics). .....................................21 1.6 Graph of the “Quality” by “Duration” for detections of Houston Toad (Bufo houstonensis) vocalizations .........................................................................................22 2.1 Map of Bastrop County, Texas, highlighting location of the Griffith League Ranch .................................................................................................29 2.2 “Pond 12” of the Griffith League Ranch in Bastrop County, Texas (in context) ........30 2.3 “Pond 12” of the Griffith League Ranch in Bastrop County, Texas (aerial) ...............31 2.4 Spectrograph of overlapping Houston Toad (Bufo houstonensis) calls .......................31 3.1 Graph of Houston Toad (Bufo houstonensis) detection and environmental covariates, March 2014, Bastrop County, Texas, USA. ................................................................38 vii 3.2 Graph of Houston Toad (Bufo houstonensis) detection and environmental covariates, March 2014, Robertson County, Texas, USA. ............................................................39 3.3 Biplot of environmental covariates and their effects Houston Toad (Bufo houstonensis) detectability ...........................................................................................40 viii ABSTRACT Amphibian populations are experiencing rapid rates of decline, the causes of which are sometimes controversial. The vocalization of the male anuran is used as an indication of a potential breeding event. Researchers have been relying on these vocalizations to monitor the health, reproductive status, and diversity of anuran populations for centuries. As technology advances so does our ability to innovate and improve the way anuran populations are monitored. One such innovation comes in the form of portable commercially available audio recording devices (ARD). These tools enable researchers to capture the sounds produced by populations of any vocalizing animal species and analyze them using machine-learning techniques of pattern recognition. The application of these techniques is understudied and not well documented for anurans. I conducted rigorous testing of these techniques to improve methods of monitoring populations of the endangered Houston Toad (Bufo houstonensis). The desired result of these tests would be a reliable and robust tool for recognizing the call of the Houston Toad. This would allow researchers to search vast quantities of digital audio files for the unique sound of this animal. I also compared the efficacy of this machine-learning technique to a highly trained professional
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