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

100%

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.

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

100%

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.

Ograniczanie wyników

1 Acta Theriologica

1 Polish Journal of Ecology

1 Lee S. D.

1 Oswald C.

2 2004

Wyniki wyszukiwania

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

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