Ecology and Breeding Habitat of Colorado River Toads

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Ecology and Breeding Habitat of Colorado River Toads Daniel J. Leavitt, Taylor B. Cotten, and Jonathan D. Miller Arizona Game and Fish Department Localized Extirpation on LCR Incilius (=Bufo) alvarius Colorado River Toad a.k.a. Sonoran Desert Toad Ecological Change is a Reality: MSCP was created to deal with it Lower Colorado River Multi- Species Conservation Plan • Habitat Conservation Plan - works toward the recovery of threatened and endangered species, reducing additional species being listed Long term goals of MSCP for CRTO • Determine distribution • Protect existing occupied habitat • Determine feasibility of establishing in unoccupied habitat The Road Ahead • 2011 – 2013 – Effort determined the extent of CRTO distribution on the LCR. • Bill Williams River • Determine the ecological requirements of the species Ecological Requirements of CRTO • What governs egg laying (oviposition)? • What influences developmental success? What breeding habitat is required? • Limited observations on BWR so… • Two additional nearby drainages were assessed: – Agua Fria – Verde Methods • Survey historic locations for breeding • Multi-scalar approach to evaluating habitat: – Determine microhabitat characteristics of location (ovipostion sites) – Local conditions necessary for multiple ovipostion events (oviposition clusters) – Population centers – regional conditions Results – egg masses 2 0 12 Results – oviposition sites • In pools of lentic water • Open canopy • Few were attached to vegetation Discussion • Explosive monsoon breeders • Fast developers Recommendations • Due to fast response to monsoon rains, more observers will be deployed. • Radio-telemetry of individuals will inform decision makers better. • CRTO like lentic waters, these were not common on the LCR. – Restoration efforts for CRTO habitat should focus on oxbow-like habitats like those at Quigley WMA Acknowledgements • LCR - MSCP office: Carrie Ronning, Allen Calvert, Sonja Kokos, Jenny Smith, Michelle Reilly, Steve Farinella, Jeffery Hill • AGFD – Michael Ingraldi, Renee Wilcox, Tim Wade, Pam Kennedy, Sam Williams, Sky Arnett-Romero, Chris Melisi, and Scott Sprague • Species experts – Brian Sullivan, Keith Sullivan, Randy Babb • Photo credits – T. Cotten, B. Sullivan Questions?.

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