Seasonal Moulting in Deer Mice (&lt;em&gt;Peromyscus maniculatus&lt;/em&gt;) in the Rocky Mountains, Alberta

Tabacaru, Crisia; Millar, John S.; Longstaffe, Frederick J.

doi:10.22621/cfn.v125i2.1195

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…Depending on the time of birth, these ontogenetic molts take place either during the summer or fall and can take as little as 10 days to complete (Gottschang, ; Tabacaru, Millar, & Longstaffe, ). Adult Peromyscus typically have two seasonal molting periods, one in early summer following the breeding season and one in the fall (Brown, ; Tabacaru et al, ). Because ontogenetic molts are characterized by changes in hair color and seasonal molts by changes in both hair color and hair length (Collins, ), we could bin hair samples into distinct summer (11 week period from May 15 to August 7) and fall (11 week period from August 8 and October 31) seasons for both years.…”

Section: Methodsmentioning

confidence: 99%

“…Young-of-theyear molt from juvenile to subadult pelage and again from subadult to adult pelage. Depending on the time of birth, these ontogenetic molts take place either during the summer or fall and can take as little as 10 days to complete (Gottschang, 1956;Tabacaru, Millar, & Longstaffe, 2011). Adult Peromyscus typically have two seasonal molting periods, one in early summer following the breeding season and one in the fall (Brown, 1963;Tabacaru et al, 2011).…”

Section: Stable Isotope Integration Period and Valuesmentioning

confidence: 99%

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Pulsed resource availability changes dietary niche breadth and partitioning between generalist rodent consumers

Stephens

Hobbie

Lee

et al. 2019

Ecology and Evolution

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Identifying the mechanisms that structure niche breadth and overlap between species is important for determining how species interact and assessing their functional role in an ecosystem. Without manipulative experiments, assessing the role of foraging ecology and interspecific competition in structuring diet is challenging. Systems with regular pulses of resources act as a natural experiment to investigate the factors that influence the dietary niches of consumers. We used natural pulses of mast‐fruiting of American beech (Fagus grandifolia) to test whether optimal foraging or competition structure the dietary niche breadth and overlap between two congener rodent species (Peromyscus leucopus and P. maniculatus), both of which are generalist consumers. We reconstructed diets seasonally over a 2‐year period using stable isotope analysis (δ13C, δ15N) of hair and of potential dietary items and measured niche dynamics using standard ellipse area calculated within a Bayesian framework. Changes in niche breadth were generally consistent with predictions of optimal foraging theory, with both species consuming more beechnuts (a high‐quality food resource) and having a narrower niche breadth during masting seasons compared to nonmasting seasons when dietary niches expanded and more fungi (a low‐quality food source) were consumed. In contrast, changes in dietary niche overlap were consistent with competition theory, with higher diet overlap during masting seasons than during nonmasting seasons. Overall, dietary niche dynamics were closely tied to beech masting, underscoring that food availability influences competition. Diet plasticity and niche partitioning between the two Peromyscus species may reflect differences in foraging strategies, thereby reducing competition when food availability is low. Such dietary shifts may have important implications for changes in ecosystem function, including the dispersal of fungal spores.

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Section: Methodsmentioning

confidence: 99%

Section: Stable Isotope Integration Period and Valuesmentioning

confidence: 99%

Pulsed resource availability changes dietary niche breadth and partitioning between generalist rodent consumers

Stephens

Hobbie

Lee

et al. 2019

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Because body mass is positively correlated with age in Peromyscus (Chappell, 2003), the positive relationship between CORT hair and body mass might be indicative of a relationship between mouse age, moulting, and CORT hair levels. Moulting in Peromyscus occurs before or following energetically demanding time periods, such as breeding (Pierce & Vogt, 1993), although some hair replacement likely occurs year-round outside of complete moults as in deer mice (Tabacaru, Millar & Longstaffe, 2011). Moulting is in part regulated by CORT, because steroid hormones have an inhibitory effect on moulting in Peromyscus (Garwood & Rose, 1995).…”

Section: Hair Corticosterone Increased With Body Massmentioning

confidence: 99%

No island-effect on glucocorticoid levels for a rodent from a near-shore archipelago

Stewart

Mastromonaco

Burness

2020

PeerJ

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Island rodents are often larger and live at higher population densities than their mainland counterparts, characteristics that have been referred to as ''island syndrome''. Island syndrome has been well studied, but few studies have tested for island-mainland differences in stress physiology. We evaluated island syndrome within the context of stress physiology of white-footed mice (Peromyscus leucopus) captured from 11 islands and five mainland sites in Thousand Islands National Park, Ontario, Canada. Stress physiology was evaluated by quantifying corticosterone (a stress biomarker), the primary glucocorticoid in mice, from hair and its related metabolites from fecal samples. White-footed mice captured in this near-shore archipelago did not display characteristics of island syndrome, nor differences in levels of hair corticosterone or fecal corticosterone metabolites compared with mainland mice. We suggest that island white-footed mice experience similar degrees of stress in the Thousand Islands compared with the mainland. Although we did not find evidence of island syndrome or differences in glucocorticoid levels, we identified relationships between internal (sex, body mass) and external (season) factors and our hormonal indices of stress in whitefooted mice. . ArensA, McNab BK. 2001. The comparative energetics of caviomorph rodents. Comparative Biochemistry and Physiology Part A 130:105-122. Barrett K, Anderson WB, Wait DA, Grismer LL, Polis GA, Rose MD. 2005. Marine subsidies alter the diet and abundance of insular and coastal lizard populations. Dewsbury DA, Baumgardner DJ, Evans RL, Webster DG. 1980. Sexual dimorphism for body mass in 13 taxa of muroid rodents under laboratory conditions. Journal of Mammalogy 61:146-149 DOI 10.2307/1379975. Erickson RL, Browne CA, Lucki I. 2017. Hair corticsterone measurement in mouse models of type 1 and type 2 diabetes mellitus. Physiology and Behavior 178:166-171 hormone research in uncontrolled, natural environments: the problem with sex, diet, metabolic rate and the individual: non-invasive hormone research. Methods in Ecology and Evolution 3:757-765 Harper GA, Rutherford M. 2016. Home range and population density of black rats (Rattus rattus) on a seabird island: a case for a marine subsidised effect? New Zealand Journal of Ecology 40:219-228. Harper JM, Austad SN. 2000. Fecal glucocorticoids: a noninvasive method of measuring adrenal activity in wild and captive rodents. Physiological and Biochemical Zoology: Ecological and Evolutionary Approaches 73:12-22 DOI 10.1086/316721. Harper JM, Austad SN. 2001. Effect of capture and season on fecal glucocorticoid levels in deer mice (peromyscus maniculatus) and red-backed voles (clethrionomys gapperi). General and Comparative Endocrinology 123:337-344 DOI 10.1006/gcen.2001.7682. Hayssen V, Harper JM, DeFina R. 2002. Fecal corticosteroids in agouti and non-agouti deer mice (Peromyscus maniculatus). Comparative Biochemistry and Physiology Part . Holding ML, Frazier JA, Dorr SW, Pollock NB, Muelleman PJ, Branske A, Henningsen SN...

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Section: Hair Corticosterone Increased With Body Massmentioning

confidence: 99%

Peer Review #2 of "No island-effect on glucocorticoid levels for a rodent from a near-shore archipelago (v0.1)"

2020

View full text Add to dashboard Cite

Island rodents are often larger and live at higher population densities than their mainland counterparts, characteristics that have been referred to as "island syndrome". Island syndrome has been well studied, but few studies have tested for island-mainland differences in stress physiology. We evaluated island syndrome within the context of stress physiology of white-footed mice (Peromyscus leucopus) captured from 11 islands and 5 mainland sites in Thousand Islands National Park, Ontario, Canada. Stress physiology was evaluated by quantifying corticosterone (a stress biomarker), the primary glucocorticoid in mice, from hair and its related metabolites from fecal samples. White-footed mice captured in this near-shore archipelago did not display characteristics of island syndrome, nor differences in levels of hair corticosterone or fecal corticosterone metabolites compared with mainland mice. We suggest that island white-footed mice experience similar degrees of stress in the Thousand Islands compared with the mainland. Although we did not find evidence of island syndrome or differences in glucocorticoid levels, we identified relationships between internal (sex, body mass) and external (season) factors and our hormonal indices of stress in white-footed mice.

show abstract

Seasonal Moulting in Deer Mice (<em>Peromyscus maniculatus</em>) in the Rocky Mountains, Alberta

Cited by 12 publications

References 14 publications

Pulsed resource availability changes dietary niche breadth and partitioning between generalist rodent consumers

Pulsed resource availability changes dietary niche breadth and partitioning between generalist rodent consumers

No island-effect on glucocorticoid levels for a rodent from a near-shore archipelago

Peer Review #2 of "No island-effect on glucocorticoid levels for a rodent from a near-shore archipelago (v0.1)"

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