Archangiopteris, a genus of the eusporangiate ferns, is endemic to Southeast Asia. A single population of A. itoi and two populations of A. somai remained threatened in Taiwan due to human overexploitation. This study investigated levels of genetic diversity and phylogeographic pattern based on nucleotide sequences of the atpB-rbcL intergenic spacer of cpDNA. Unexpectedly high levels of genetic variation were detected. A neighbour-joining tree revealed paraphyly at the cpDNA noncoding spacer within each morphologically differentiated Archangiopteris species. Lower levels of cpDNA variation were detected in A. itoi, due to smaller population number and size. No genetic differentiation was detected between populations of A. somai. The short isolation period since the last glaciation may have caused the paraphyly of each population due to the insufficient period for coalescence. Increasing individuals and populations through habitat protection, transplantation, cultures and reintroduction could decrease the threat of their extinction.
|Number of pages||6|
|Publication status||Published - 2002 Dec 1|
All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Plant Science