Ecogeography of the grass genusHelictotrichon (Poaceae: Aveneae) in the Mediterranean and adjacent regions
Ecogeography of the grass genusHelictotrichon (Poaceae: Aveneae) in the Mediterranean and adjacent regions
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地中海及邻近地区草属Helictotrichon（禾本科：燕麦科）的生态地理学
DOI：
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发表时间：
1996
影响因子：
1.9
通讯作者：
M. Röser
中科院分区：
文献类型：
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作者：
M. Röser
本文对地中海地区33个分类群的草属螺旋trichon的地理分布进行了分析和制图。仅以单一的生命形式（多年生草本植物）为基础，该地区已经进化出各种适应不同土壤、气候和海拔的物种复合体。这些复合体大多表现为东西不相交，并包含地理上，有时甚至是地理上互补分布的替代类群。从中胚习性到旱胚习性的转变在不同的物种群中独立发生，并导致了“现代”地中海分类群的建立，这些分类群部分是中胚性二倍体的高度多倍体衍生物。多倍体的意义、异域和同域分布模式、生物地理边界和物种多样性中心在地中海植被历史的背景下进行了讨论。新组合有：螺旋trichon setaceum subsp；petzense， H. pratense亚种。lusitanicum， H. praetutium。
The geographical distribution of the grass genusHelictotrichon in the Mediterranean Region is analysed and mapped for 33 taxa. Based on only a single life form (perennial herb), a variety of edaphically, climatically and altitudinally differently adapted species complexes has evolved in the area. Most of these complexes show west-east disjunctions and contain geographically, sometimes even edaphically vicarious taxa with complementary distribution. A transition from mesomorphic to xeromorphic habit occurred independently in different species groups and led to the establishment of the “modern” Mediterranean taxa which are in part highly polyploid derivatives of more mesophilic diploids. The significance of polyploidy, patterns of parapatric and sympatric distribution, biogeographical borders, and centres of species diversity are discussed in context with the history of the Mediterranean vegetation. New combinations are:Helictotrichon setaceum subsp.petzense, H. pratense subsp.lusitanicum, H. praetutianum.