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Effect of burrowing activity of root vole [Microtus oeconomus Pallas] on plant diversity in alpine meadow

100%

Sun P., Zhao X., Zhu W., Xu S.

Polish Journal of Ecology

2005

tom 53

nr 4

Herbivory and burrowing activity of mammals may influence the species composition and diversity of plant communities. The effect of corridors and holes systems constructed by root vole (Microtus oeconomus Pallas) on the plant species diversity was studied in the habitat of high - mountain meadow (3250 m a.s.l in Qinghai-Tibet Plateau, China). By using grid method, these disturbances were studied on 16 plots (100 cm × 100 cm) distributed in 4 transects in studied area, in August 2000 and 2001. The disturbance intensity index, D, was calculated as the percent of the ground surface disturbed by voles in the study area. Plant species were identified and counted on the same plots. In total 46 plant species were identified – 39% of this number was considered as sensitive to the vole disturbances as their occurrence and/or abundance decreased along the disturbance intensity. Generally, a significantly negative correlation (r = – 0.911, P < 0.01) between vole aboveground disturbances and plant species diversity (H’) was found. The results suggest that root vole ground disturbances, especially in the form of actively utilized holes and corridors have significantly negative influence on plant species diversity in high-mountain grassland habitat.

Refuge microclimates of rodents: a surface nesting Otomys unisulcatus and burrowing Parotomys brantsii

67%

Du P. A., Kerley G. I. H., Winter P. E. D.

Acta Theriologica

1992

tom 37

nr 4

We investigated microclimates of the nest of Otomys unisulcatus Cuvier, 1829 and the warren of Parotomys brantsii (Smith, 1834) during two seasons and correlated these with the rodents' physiology. In both rodents' refuges, temperature varied less than ambient temperature (TA). In winter, temperatures in the O. unisulcatus nest at 40 cm below the nest apex, and in Lhe P. brantsii warren 15 cm below the soil surface, were higher than noclurnal TA. In summer, during the hours of highest TA, refuges wore cooler than TA. Vapour pressure (v.p.) in the refuges varied less and was higher than ambient v.p. In the humid refuges, heat loss by conduction rather than evaporative water loss is suggested. The nest of O. unisulcatus, with less temperature variation in winter and lower temperatures in summer, was less dependent ofTA than P. brantsii's warren. The use of these refuges therefore contributes to the survival of those mesic rodents in a semi-arid region.

Ograniczanie wyników

1 Acta Theriologica

1 Polish Journal of Ecology

1 Du P. A.

1 Kerley G. I. H.

1 Sun P.

1 Winter P. E. D.

1 Xu S.

1 Zhao X.

1 Zhu W.

1 2005

1 1992

Wyniki wyszukiwania

Effect of burrowing activity of root vole [Microtus oeconomus Pallas] on plant diversity in alpine meadow

Refuge microclimates of rodents: a surface nesting Otomys unisulcatus and burrowing Parotomys brantsii