A big congrats to KCRL’s Amanda Veals and Sam Abercrombie on the successful defense of their Master’s theses.
Amanda’s research focused on the spatial ecology of gray foxes (Urocyon cinereoargenteus) in southeastern Arizona and documented home range size and habitat affiliation of foxes in two mountain ranges. Her data will inform species management plans and models of disease transmission, particularly rabies.
Sam’s research focused on the role of native herbivory on shrub encroachment and suppression of grass regeneration in southern Arizona grasslands. Sam’s research is the first to document the role that abundant desert cottontail (Sylvilagus audubonii) and low predation pressure may play in suppressing grass regeneration and promoting shrub dominance.
New research from KCRL PhD student Kira Hefty documents a novel method for obtaining high-resolution space use data in a small mammal. For her Master’s research, Kira investigated foraging and space use behaviors of golden-mantled ground squirrels (Callospermophilus lateralis) in the Sierra Nevada Mountains. Using mini-GPS technology, Kira documented fine-scale spatio-temporal space use behavior to determine foraging strategies and and how individuals perceived risk as a function of cover type and distance from refuge and burrows. Individuals exhibited foraging and movement strategies that maximized energy intake and minimized predation risk.
Read more here:
Hefty, K. L. and K. M. Stewart. 2018. Novel location data reveal spatiotemporal strategies used by a central-place forager. Journal of Mammalogy DOI:10.1093/jmammal/gyy019.
New research published this week by KCRL’s Melissa Merrick, John Koprowski, and alum Emily Goldstein estimates survival and mortality in known-fate, radio-collared Mt. Graham red squirrels as well as examines the relative hazard of death from avian and mammalian predators, as well as unknown causes. Annual survival in Mt. Graham red squirrels is low (37%) and annual mortality estimates (68% adults, 74% juveniles) are among the highest reported in North America. Birds or prey were responsible for the majority of deaths, and juveniles were even more likely to succumb to avian predation (75%) compared to adults (65%). The Pinaleño mountains in southeastern Arizona are part of the unique sky island archipelago known for high biodiversity and endemism. Many species of avian predators also call the Pinaleños home and two species, Mexican spotted owls (Strix occidentalis lucida) and Northern Goshawks (Accipiter gentilis) are themselves threatened or of conservation concern. The presence of an ecologically similar, but non-native tree squirrel, the Abert’s squirrel (Sciurus aberti), may subsidize the hungry raptors and support higher predator densities than would occur with red squirrels alone. Increased control of Abert’s squirrels along with habitat augmentation to increase food, nest sites, and structural complexity are recommended conservation actions along with long term forest restoration efforts.
Read more here:
Goldstein, E. A., M. J. Merrick, and J. L. Koprowski. 2018. Low survival, high predation pressure present conservation challenges for an endangered endemic forest mammal. Biological Conservation 221:67-77.
Mt. Graham red squirrel
Long eared owl
KCRL PhD student I. Mauricio Vela-Vargas in collaboration with Corporación Autónoma Regional del Guavio – CORPOGUAVIO, Parques Nacionales Naturales de Colombia (Parque nacional Natural Chingaza, Dirección Territorial Orinoquía) & Projecto de Conservación de Aguas y tierras – ProCAT Colombia have published a new book about the ecology of the Andean bear (Tremarctos ornatus) in the Chingaza Massif of Colombia. Dr. K wrote the foreword, and Mauricio is lead author for Chapter 3, Generalidades del Oso Andino.
Vela-Vargas, I. Mauricio, J. Sebastián Jiménez-Alvarado, Diego A. Zárrate-Charry, C. Moreno-Diaz, A. Parra-Romero, and J. F. González-Maya. 2017. Capítulo 3: Generalidades del Oso Andino (Tremarctos ornatus: Ursidae). In El Oso Andino en el Macizo de Chingaza. J. F. González-Maya, R. Galindo-Tarazona, M. M. Urquijo Collazos, M. Zárate Vanegas, and A. Parra-Romero Eds. Bogotá: Empresa de Acueducto, Alcantarillado y Aseo de Bogotá D. C.. EAB-ESP, Corporación Autónoma Regional del Guavio – CORPOGUAVIO, Parques Nacionales Naturales de Coombia (Parque nacional Natural Chingaza, Dirección Territorial Orinoquía) & Projecto de Conservación de Aguas y tierras – ProCAT Colombia. Pp. 58-120.
Read the entire volume here: González-Maya et al. 2017 Libro Oso Chingaza
Andean bear (Tremarctos ornatus)
New research by KCRL alum Shari Ketcham examines the differential response of fire and associated burn severity by the native Arizona gray squirrel (Sciurus arizonensis) and introduced Abert’s squirrel (Sciurus aberti). Abert’s squirrels, native to northern and central Arizona mountains but introduced to the sky islands of southern Arizona in the 1940’s, tend to be more tolerant of landscapes impacted by fire, whereas native Arizona gray squirrels are associated with dense riparian forests with adequate trees for nesting. Ketcham et al found that in the Santa Catalina Mountains, where Abert’s squirrels were introduced, Abert’s squirrels readily used forest impacted by recent fire. In contrast, Arizona gray squirrels were only detected in riparian areas that were not impacted by fire. This provides a management opportunity for the restoration of riparian areas that have burned in an effort to increase habitat for the native species.
Read more here: Ketcham, S. L., J. L. Koprowski, and D. A. Falk. 2017. Differential response of native Arizona gray squirrels and introduced Abert’s squirrels to a mosaic of burn severities. Mammal Study 42:247-258.
Arizona gray squirrel with ear tags in Ramsey Canyon, Huachuca Mountains Arizona
Abert’s squirrel in winter plumage, Pinaleño Mountains, Arizona
The research of KCRL PhD student and World Wildlife Fund Fellow, Shambhu Paudel, was recently featured in Whale & Dolphin magazine. Whale & Dolphin magazine is a publication of Whale and Dolphin Conservation, the leading global charity dedicated to the conservation and protection of whales and dolphins. Shambhu received WDC’s Bharathi Viswanathan award for innovative, non-invasive research earlier this year.
Click on photo below for full story!