期刊
JOURNAL OF ARID ENVIRONMENTS
卷 74, 期 8, 页码 991-997出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2009.12.002
关键词
Agropyron cristatum; Anemochory; Endozoochory; Epizoochory; Hydrochory; Stipa krylovn
资金
- German Science Foundation/DFG
- Biodiversity and Climate Research Centre, BIK-F
Nomadic livestock husbandry is the main form of land use in Mongolia Grazing impact on plant productivity has frequently been studied, but effects on dispersal modes are largely unknown We assessed the relative importance of zoochorous dispersal for several species but focused on the dominant fodder glasses Agropyron cristatum and Stipa krylovn We searched for seeds in the fur of goats and sheep, but also experimentally attached diaspores and monitored retention Endozoochory was tested by incubating faecal samples under standardised conditions Lab experiments on zoochory, anemochory and hydrochory supplemented the field studies Seed retention in sheep fur was consistently good, and seeds stayed in the fur for hours or even days Endozoochory proved to be of minor importance, while hydrochory is possible but depends on rarely occurring surface floods Modelling potential dispersal distances showed that anemochory over larger distances is hardly possible Thus, long-distance dispersal largely depends on epizoochory, as herds of sheep and goats cover up to 15 km per day and conduct long-range migrations in years of drought In terms of seed retention potential, goats are relatively pool vectors, which is of concern due to their relative and absolute share of Mongolian livestock herds having dramatically increased in recent years (C) 2010 Elsevier Ltd All rights reserved
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