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1

Mensural discrimination between sympatric Peromyscus leucopus and P. maniculatus in southern Illinois

100%
Sternburg J. E., Feldhamer G. A.
Acta Theriologica
|
1997
|
tom 42
|
nr 1
A total of 383 Peromyscus was collected from southern Illinois to determine morphological characteristics useful in identifying individuals as either P. leucopus (Rafinesque, 1818) or P. maniculatus (Wagner, 1845). Polyacrylamide gel electropho­resis of salivary amylase was used to positively identify all specimens. No univariate morphological character accurately discriminated between the two species because of a high degree of intraspecific variation. Stepwise discriminant function analysis of external characters correctly classified 97.9% of subadults to species. The most important external character was the tail length/body length ratio. This ratio was also the most important factor in discrimination of adults; the function correctly classified 98.6% of individuals. Considering skull measurements of adults, 9 cranial characters were needed to differentiate between the two species, with a correct classification of 98.9%. For old adults, all specimens were classified correctly using 5 cranial charac­ters. There was no fast, easy, accurate method to discriminate between these species 100% of the time in the fieid.
2

Population dynamics and demography of deermice [Peromyscus maniculatus] in heterogeneous habitat: role of coarse woody debris

84%
Lee S. D.
Polish Journal of Ecology
|
2004
|
tom 52
|
nr 1
I tested the hypothesis that habitat heterogeneity increases with increasing amounts of coarse woody debris (CWD) by comparing Peromyscus maniculatus populations in sites with high and low amounts of CWD. Sherman live-trapping technique was applied to monitor population fluctuation and to measure demographic parameters. In sites with high amount of CWD density was higher, populations fluctuated less, survivorship was better and residency time was longer. These results were in accordance with predictions of habitat heterogeneity and CWD played an important role for demography of P. maniculatus in managed coniferous forests.
3

The effects of habitat fragmentation on populations of three species of small mammals in eastern Kansas

84%
Gaines M. S., Diffendorfer J. E., Foster K., Wray F. P., Holt R. D.
Polish Ecological Studies
|
1994
|
tom 20
|
nr 3-4
4

Gastrointestinal and tissue levels of nickel in deer mice Peromyscus maniculatus and woodrats Neotoma fuscipes from serpentine and non-serpentine areas

84%
Oswald C.
Acta Theriologica
|
2004
|
tom 49
|
nr 3
Serpentine geologic formations have soils high in nickel. Nickel exerts deleterious effects on several body systems, and often accumulates in organs of laboratory animals exposed to nickel. To establish if deer mice Peromyscus maniculatus Wagner, 1845 and dusky-footed woodrats Neotoma fuscipes Baird, 1858 of serpentine areas ingest nickel, and to determine if nickel accumulates in body tissues, I measured nickel in several organs and tissues of animals from serpentine and nonserpentine sites in southern Oregon. Nickel was present in significantly greater concentrations in the contents of the stomachs and small intestines of P. maniculatus and N. fuscipes from serpentine areas than in those of animals from nonserpentine areas. Nickel was not detected, or was present in only trace amounts, in the livers, kidneys, spleens, hearts, lungs, brains, skeletal muscles, and bones of both species from both serpentine and nonserpentine sites. P. maniculatus from serpentine areas had significantly greater concentrations of nickel in the seminal vesicles, testes, and uteri and ovaries than did P. maniculatus from nonserpentine areas.
5

Maximizing survivorship in cold: thermogenic profiles of non-hibernating mammals

84%
Merritt J. F., Zegers D. A.
Acta Theriologica. Supplement
|
2002
|
tom 47
|
nr 1
Winter-active small mammals residing in seasonal environments employ many dif­ferent behavioral, anatomical and physiological mechanisms to cope with cold. Herein we review research on survival mechanisms in cold employed by small mammals with emphasis on the families Soricidae, Muridae and Sciuridae. The focus of this review is on research delineating the role of seasonal changes in resting metabolic rate (RMR), nonshivering thermogenesis (NST), body mass, and communal nesting in enhancing winter survivorship of six species of small mammals (masked shrew Sorex cinereus, short-tailed shrew Blarina brevicauda, southern red-backed vole Clethrionomys gapperi, white-footed mouse Peromyscus leucopus, deer mouse P. maniculatus, and southern flying squirrel Glaucomys volans) residing in the Appalachian Mountains of Pen­nsylvania, USA. Each species shows good over-winter survivorship but exhibits a different suite of mechanisms to maximize survival in cold. B. brevicauda, S. cinereus, and G. volans show slight increases in RMR during winter, whereas Peromyscus and C. gapperi exhibit decreased RMR overwinter. All six species experience elevated NST in winter. The comparatively low RMR and NST of G. volans during winter was attri­butable to a decreased energy expenditure due to a larger body mass, coupled with communal nesting in cavities of trees that provided insulation from low ambient temperatures. Squirrels nesting singly experienced a longer period of elevated NST in winter and higher mean NST year-round than did squirrels nesting communally. Energy conservation in the form of growth retardation in winter was exhibited by C. gapperi and S. cinereus but not the other species.
6

A new species of Heligmosomoides [Nematoda, Heligmosomidae] parasitic in Peromyscus maniculatus [Rodentia, Cricetidae] from Pennsylvania, USA

67%
Durette-Desset M. C., Kinsella J. M.
Acta Parasitologica
|
2007
|
tom 52
|
nr 4
Heligmosomoides vandegrifti sp. nov. (Nematoda, Heligmosomidae) is described from Peromyscus maniculatus (Rodentia, Cricetidae) from Pennsylvania, USA. It differs from its closest congener, H. douglasi, in the number of cuticular ridges (35 vs. 32 in male, 36 vs. 41 in female at mid-body), longer bursal rays 2 in relation to rays 3, and in having smaller spicules (635–740 μm long vs. 1 mm). It is proposed that both H. douglasi and H. vandegrifti sp. nov. are parasites of capture from species in North American arvicoline rodents.
7

Czwarty żywioł

51%
Zwolak R.
Wiedza i Życie
|
2009
|
nr 08
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