Seed mass increase along altitude within four Saussurea (Asteraceae) species in Tibetian Plateau

• Autorzy: Wu G. , Tian F. , Ren G. , Liu Z.
• Języki publikacji: EN

Abstrakty

EN

Seed mass is a critical life-history character in seed evolutionary ecology. Plant species can present responses in seed mass to environment stresses. We tested the hypotheses that seed mass was positively correlated with altitude within species. We selected four congeneric Saussurea species as study objects, and collected their seeds along altitudinal gradients (2100.4200 m a.s.l.) in the alpine area of the Qinghai-Tibetan Plateau, China. Results showed that mean seed mass of the four species were significantly affected by altitude (P <0.001). There was a general trend of an increase in seed weight with altitude among the populations of the four species. In addition, mean seed mass of four species were not significantly different, but all presented a bigger coefficients of variation within species along altitude gradients. Our results indicate selection pressure within species, with larger seeds occurring at higher altitudes.

Słowa kluczowe

EN

adaptation strategy; altitude; Qinghai-Tibetan Plateau; Saussurea sp.; seed mass

PL

masa nasion; Saussurea; strategia adaptacji; wysokość; Wyżyna Tybetańska

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2011
• Tom: Vol. 59, nr 3
• Strony: 617--622
• Opis fizyczny: Bibliogr. 42 poz.,

Twórcy

autor

Wu G.

autor

Tian F.

autor

Ren G.

autor

Liu Z.

• State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau of Northwest A&F University, Yangling 712100 Shaanxi, China ; Institute of Soil and Water Conservation of Chinese Academy of Sciences (CAS) and Ministry of Water Resource (MWR),

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