26 marzo, 2023

Mouse Raised at San Diego Zoo Certified by GUINNESS WORLD RECORDS™ as Oldest Living Mouse in Human Care


San Diego Zoo Wildlife Alliance today received a GUINNESS WORLD RECORDS™ title for Oldest Living Mouse in Human Care recognizing “Pat,” a Pacific pocket mouse fondly named after actor Sir Patrick Stewart. Pat was born July 14, 2013 at the San Diego Zoo Safari Park, in the first year of the organization’s Pacific pocket mouse conservation breeding and reintroduction program. Today, he is 9 years and 209 days old. The GUINNESS WORLD RECORDS title is a win for all the tiny but mighty—and often overlooked—species around the world that play an important role in their ecosystems.

Team members and local and regional partners were present at a ceremony this morning in which Debra Shier, Ph.D., Brown Endowed Associate Director of Recovery Ecology at San Diego Zoo Wildlife Alliance, who established and continues to oversee the Pacific pocket mouse conservation breeding program, accepted a plaque commemorating Pat’s significant age.

“This recognition is so special for our team, and is significant for the species,” said Shier. “It’s indicative of the dedication and incredible care we as an organization provide for each species, from the largest to the very smallest. This acknowledgement is also a symbol of appreciation for species that people don’t know much about because they’re not charismatic megafauna, but are just as critical for ecosystem function. These overlooked species can often be found in our own backyards—like the Pacific pocket mouse.”

The acknowledgement from GUINNESS WORLD RECORDS comes on the heels of a historic Pacific pocket mouse breeding season. In 2022, San Diego Zoo Wildlife Alliance recorded the earliest breeding event and pup birth in the history of the program, and the team helped with producing a record 31 litters, for a total of 117 pups during the spring and summer months. Many of these mice will be reintroduced into native habitats this spring.

Endemic to coastal scrublands, dunes and riverbanks within about 2 miles of the ocean, the Pacific pocket mouse’s range once stretched from Los Angeles to the Tijuana River Valley. Because of human encroachment and habitat degradation, their numbers dropped sharply after 1932. For 20 years, they were thought to be extinct until a tiny remnant population was rediscovered in 1994 at Orange County’s Dana Point headlands. By then, the species had been reduced to just a few small populations, isolated from one another by long distances and urban barriers.

Continued declines in Pacific pocket mice populations prompted the establishment of San Diego Zoo Wildlife Alliance’s conservation breeding program in 2012 to help save the species from extinction. San Diego Zoo Wildlife Alliance carries out a breeding program and studies behavior, ecology, genetics, microbiome and physiology to best support genetically diverse, healthy and behaviorally competent mice that are well prepared for reintroduction into native habitats. With the support from Orange County Parks, in 2016, San Diego Zoo Wildlife Alliance, the U.S. Fish and Wildlife Service, and the California Department of Fish and Wildlife began to establish a new population of Pacific pocket mice in Orange County’s Laguna Coast Wilderness Park, and they began to breed without human assistance in 2017.

Weighing about the same as three pennies, the endangered Pacific pocket mouse is the smallest mouse species in North America. They get their name from pouches in their cheeks used to carry food and nesting materials. Though small, these mice play a crucial role in their ecosystems by dispersing the seeds of native plants and encouraging plant growth through their digging activities.

In addition to bolstering the species and maintaining high genetic diversity, the breeding program provides the added benefit of increasing the understanding of how to better manage genetic diversity of populations in their native habitats. Because only three small populations of Pacific pocket mice remain, San Diego Zoo Wildlife Alliance’s collaborative efforts to augment population numbers, as well as to study and understand their biology and habitat requirements, are critical in conservation of the species.

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