Ramos-Lara, N., J. L. Koprowski, and D. E. Swann. 2013. Nest-site characteristics of the montane endemic Mearns's squirrel (Tamiasciurus mearnsi): an obligate cavity-nester? Journal of Mammalogy 94:50-58.

thackerk1 — Tue, 30 Jul 2019 18:09:11 +0000

Authors

Nicolás Ramos-Lara

John L. Koprowski

Don E. Swann

Many animals depend on nests for their survival and reproduction, with some species considered obligate tree cavity-nesters. Mearns’s squirrel (Tamiasciurus mearnsi) is a species endemic to the Sierra de San Pedro Mártir, Baja California, Mexico, that relies on tree cavities for nesting. Federally listed as threatened in Mexico, and as endangered by the International Union for Conservation of Nature, the ecology of this southernmost Tamiasciurus is poorly known. The aim of this study was to examine the nesting requirements of Mearns’s squirrels. We used telemetry to locate the nests and 10-m-radius circular plots to compare habitat characteristics between nest sites and random sites, nest sites of males and females, and nest sites of breeding and nonbreeding females. Nest tree species, nest tree condition, nest tree size (diameter at breast height), canopy cover, and occurrence of white firs (Abies concolor) are important characteristics for nesting. Nest sites of males did not differ from those of females except for nest tree condition. Females apparently do not have specific nesting requirements for rearing young. Unlike other congeners that also build leaf nests and underground burrows for nesting, large trees and snags that facilitate cavity formation are critical for the conservation of this species.

Additional Information

Nest-site characteristics of the montane endemic Mearns’s squirrel (Tamiasciurus mearnsi): an obligate cavity-nester?

Date of publication:

2013

Topics

cavity nests

endemic species

nest sites

tree cavities

Mearn’s squirrel

conservation.arizona.edu - tree cavities

Ramos-Lara, N., J. L. Koprowski, and D. E. Swann. 2013. Nest-site characteristics of the montane endemic Mearns's squirrel (Tamiasciurus mearnsi): an obligate cavity-nester? Journal of Mammalogy 94:50-58.

Authors

Additional Information

Topics