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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.

Invasion of Descurainia sophia [L.] [Cruciferae] in Alpine meadow is enhanced by ground disturbance made by Myospalax fontanierii [Milne-Edwards]

84%

Li W., Zhang Y., Wang Y.

Polish Journal of Ecology

2009

tom 57

nr 2

389-393

Because of cold weather and extremely harsh environment, there is few exotic species in Qinghai-Tibetan Plateau. Plateau zokor (Myospalax fontanierii), dominant borrowing small mammal, plays a role as ‘ecosystem engineer’ in alpine meadow ecosystem. We measured and compared the dispersion area, branches, height and number of branches of flixweed tansymustard (Descurainia sophia) on the area disturbed by zokor mounds and in the undisturbed alpine meadow. Flixweed tansymustard is cool-season annual or biennial typical farmland weed in China, and is not found in alpine meadow before. The results indicated that zokor mounds significantly increased the dispersion area, number of individuals in each dispersion area, height and number of branches of flixweed tansymustard on the area disturbed by zokor mounds compared to those in undisturbed alpine meadow. These results suggest that ecosystem engineering by native species of rodent could promote the invasions of alien plant species in alpine meadow ecosystem, leading to higher abundances of invaders.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Li W.

1 Sun P.

1 Wang Y.

1 Xu S.

1 Zhang Y.

1 Zhao X.

1 Zhu W.

1 2009

1 2005

Wyniki wyszukiwania

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

Invasion of Descurainia sophia [L.] [Cruciferae] in Alpine meadow is enhanced by ground disturbance made by Myospalax fontanierii [Milne-Edwards]