Tamias speciosus

Best, Troy L.; Clawson, R.G.; Clawson, Joseph A.

doi:10.2307/3504259

Cited by 12 publications

(14 citation statements)

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“…This may explain why meadow specialists like U. beldingi (Jenkins and Eshelman ) and M. montanus (Sera and Early ) and riparian species as Z. princeps (Hart et al ) were not synchronous to changes in vegetation ranges. Further, WHR vegetation type change detection did not measure increase in density in SMC (Collins et al ) and the change in forest structure (Mantgem and Stephenson , Lutz et al ), to which species like S. trowbridgii (George ) or T. speciosus (Best et al ) are likely to respond.…”

Section: Discussionmentioning

confidence: 99%

Synchronicity in elevation range shifts among small mammals and vegetation over the last century is stronger for omnivores

2014

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In mountain ecosystems, species can be said to respond synchronously to environmental change when the elevation ranges of vegetation types and their associated vertebrates expand or contract in the same direction. Conversely, the response is asynchronous when the elevation ranges of vegetation types and associated vertebrates change in different directions. The capacity of vertebrate species to respond synchronously with change in the elevation ranges of the vegetation that comprises their habitat is likely a function of their ecological traits. Here we combine measures of elevation range shifts in 23 vertebrate species with those of their associated vegetation types across 80 yr, on a large elevation transect in California's Sierra Nevada mountains that encompasses Yosemite National Park. Half the species’ shifts were synchronous with vegetation shifts, ¼ of the species were asynchronous, and the others showed no relationship. Most species that responded synchronously to changes in vegetation elevation ranges expanded their elevation range, and are inhabitants of low and intermediate elevations. In contrast, those species whose range shifts were asynchronous to associated vegetation shifts inhabit high elevations. These species experienced contraction in elevation range even while their associated vegetation types expanded. However, these species were responding synchronously to a subset of their associated vegetation types. Considering trait‐based predictors, omnivores were more synchronous than herbivores. Our results on synchronous and asynchronous elevation shifts with vegetation may permit more accurate modeling of future ranges for vertebrates in California's Sierra Nevada. The approach also offers a new method for use in assessment of vertebrate vulnerability in other mountain regions, and can be an important component of assessing their vulnerability to climate change.

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Section: Discussionmentioning

confidence: 99%

Synchronicity in elevation range shifts among small mammals and vegetation over the last century is stronger for omnivores

2014

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“…Although these species are partially sympatric in many parts of their ranges, they are believed to differ in their degree of ecological specialization. While T. alpinus is thought to be restricted to high‐elevation alpine habitats, T. speciosus occurs in a variety of habitats extending from tree line down through several types of forest (Grinnell & Storer, ; Best et al ., ; Clawson et al ., ). Efforts to model elevational distributions of these species indicate that the upward range contraction of T. alpinus over the past century is associated with the changes in abiotic conditions such as temperature (Rubidge et al ., ; Rowe et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Morphological and dietary responses of chipmunks to a century of climate change

Walsh

Assis

Patton

et al. 2016

Global Change Biology

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Predicting how individual taxa will respond to climatic change is challenging, in part because the impacts of environmental conditions can vary markedly, even among closely related species. Studies of chipmunks (Tamias spp.) in Yosemite National Park provide an important opportunity to explore the reasons for this variation in response. While the alpine chipmunk (T. alpinus) has undergone a significant elevational range contraction over the past century, the congeneric and partially sympatric lodgepole chipmunk (T. speciosus) has not experienced an elevational range shift during this period. As a first step toward identifying the factors underlying this difference in response, we examined evidence for dietary changes and changes in cranial morphology in these species over the past century. Stable isotope analyses of fur samples from modern and historical museum specimens of these species collected at the same localities indicated that signatures of dietary change were more pronounced in T. alpinus, although diet breadth did not differ consistently between the study species. Morphometric analyses of crania from these specimens revealed significant changes in cranial shape for T. alpinus, with less pronounced changes in shape for T. speciosus; evidence of selection on skull morphology was detected for T. alpinus, but not for T. speciosus. These results are consistent with growing evidence that T. alpinus is generally more responsive to environmental change than T. speciosus, but emphasize the complex and often geographically variable nature of such responses. Accordingly, future studies that make use of the taxonomically and spatially integrative approach employed here may prove particularly informative regarding relationships between environmental conditions, range changes, and patterns of phenotypic variation.

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“…Decreased biomass of decayed logs and other woody debris from thinned followed by burned plots may have reduced the frequency of truffle consumption by N. speciosus, since small mammals may use decayed wood as a visual cue for locating truffles (Pyare and Longland 2001b). Additionally, animals foraging in areas with low shrub cover (primarily heavy-thin followed by burn plots) may have been at greater predation risk (Carey 1995) and spent more time being vigilant and less time foraging for favored food items (Lima and Valone 1986), such as fruits, seeds, and fungi (Best et al 1994).…”

Section: Treatment Effects On Truffle Consumption By Neotamias Speciosusmentioning

confidence: 96%

“…We focused on N. speciosus with an omnivorous diet (Best et al 1994), because their opportunistic diet may better reflect the availability of different truffle genera in treated stands than dietary specialists like the northern flying squirrel (Glaucomys sabrinus Shaw). In addition, N. speciosus was the most abundant small mammal species in our treatment plots.…”

Section: Introductionmentioning

confidence: 99%

Short-term effects of fire and forest thinning on truffle abundance and consumption byNeotamias speciosusin the Sierra Nevada of California

Meyer¹,

North²,

Kelt³

2005

Can. J. For. Res.

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In many western North American forests, prescribed burning and mechanical thinning are widely used to reduce fuels and restore stand conditions after a century of fire suppression. Few studies have followed the relative impacts of these treatments on the production and consumption of truffles in forest ecosystems, particularly in the Sierra Nevada of California. Using a full-factorial completely randomized design, we examined the short-term impacts of prescribed burning (no burn and burn), mechanical thinning (no thin, light thin, and heavy thin), and combinations of these treatments on the production of truffles and their consumption by lodgepole chipmunks (Neotamias speciosus Merriam) in a mixed-conifer forest of the southern Sierra Nevada of California. Truffle frequency, biomass, and species richness were lower in thinned or burned plots than controls, as was the frequency and generic richness of truffles in the diet of N. speciosus. Truffle frequency, biomass, and species richness, and truffle consumption by N. speciosus were lower in heavily thinned and thinned and burned plots than in those exclusively burned. These results suggest that either thinning or burning can reduce short-term truffle production and consumption, and potentially the dispersal of ectomycorrhizal spores by small mammals. Moreover, truffles decreased with treatment intensity, suggesting heavy thinning and higher burn intensity, particularly when applied together, can significantly affect short-term truffle abundance and small mammal consumption.Résumé : Dans plusieurs forêts de l'ouest de l'Amérique du Nord, le brûlage dirigé et l'éclaircie mécanisée sont largement utilisés pour réduire les combustibles et restaurer les peuplements après un siècle de suppression des feux. Peu d'études ont examiné l'impact de ces traitements sur la production et la consommation de truffes dans les écosystèmes forestiers, particulièrement dans la Sierra Nevada en Californie. À l'aide d'un dispositif factoriel complètement aléa-toire, nous avons étudié les impacts à court terme du brûlage dirigé (brûlé et non brûlé), de l'éclaircie mécanisée (pas d'éclaircie, éclaircie légère et éclaircie forte) et des combinaisons de ces traitements sur la production de truffes et leur consommation par les tamias (Neotamias speciosus Merriam) dans une forêt mélangée de conifères située dans la partie sud de la Sierra Nevada en Californie. La richesse en espèces, la biomasse et la fréquence des truffes, de même que la fréquence et la richesse en genre de truffes dans la diète de N. speciosus, étaient plus faibles dans les parcelles brûlées ou éclaircies que dans les parcelles témoins. La richesse en espèces, la biomasse et la fréquence des truffes ainsi que la consommation de truffes par N. speciosus étaient plus faibles dans les parcelles fortement éclaircies et les parcelles éclaircies et brûlées que dans les parcelles brûlées seulement. Ces résultats indiquent que l'éclaircie ou le brûlage peuvent à court terme réduire la production et la consommation de truffes et pos...

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Tamias speciosus

Cited by 12 publications

References 0 publications

Synchronicity in elevation range shifts among small mammals and vegetation over the last century is stronger for omnivores

Synchronicity in elevation range shifts among small mammals and vegetation over the last century is stronger for omnivores

Morphological and dietary responses of chipmunks to a century of climate change

Short-term effects of fire and forest thinning on truffle abundance and consumption byNeotamias speciosusin the Sierra Nevada of California

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