Are tropical fungal endophytes hyperdiverse?

被引:557
作者
Arnold, AE [1 ]
Maynard, Z
Gilbert, GS
Coley, PD
Kursar, TA
机构
[1] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA
[2] Smithsonian Trop Res Inst, Balboa, Panama
[3] Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95064 USA
[4] Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
关键词
Barro Colorado Island; fungal endophytes; host preference; Jaccard's index; Ochnaceae; Olacaceae; Panama; tropical forests;
D O I
10.1046/j.1461-0248.2000.00159.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Fungal endophytes are ubiquitous fungi that inhabit healthy plant tissues without causing disease. Endophytes have been found in every plant species examined to date and may be important, but often overlooked, components of fungal biodiversity. In two sites in a lowland, moist tropical forest of central Panama, we quantified endophyte colonization patterns, richness, host preference, and spatial variation in healthy leaves of two co-occurring, understory tree species [Heisteria concinna (Olacaceae) and Ouratea lucens (Ochnaceae)]. From 83 leaves, all of which were colonized by endophytes, we isolated 418 endophyte morphospecies (estimated 347 genetically distinct taxa), most of which were represented by only a single isolate (59%). Among morphospecies encountered in more than one leaf (nonsingletons), we found evidence of host preference and spatial heterogeneity using both morphospecies frequencies and presence/absence records. Based on these data, we postulate that tropical endophytes themselves may be hyperdiverse and suggest that extrapolative estimates that exclude them will markedly underestimate fungal species diversity.
引用
收藏
页码:267 / 274
页数:8
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