Geographical Elements of Bryophytes Recorded from Zhoushan Archipelago——Discussion on Methods of Geographical Element Division of Bryophytes
SHEN Lin, YU Jing, LI Dan-Dan, GUO Shui-Liang
Related Articles |
Global geographical coordinates of 284 bryophytes, which had been recorded from the Zhoushan archipelago, were obtained based on the data of GBIF(Global Biodiversity Information Facility), Tropicos.org and other published literature. The world were divided into 576 geographical units(GUs), each with a size of 15°E×7.5°N. Their presence/absence data in these GUs were recorded by using ArcGis 10.2. Eleven geographical elements were identified for these bryophytes based on a clustering analysis with the above data and their actual geographical distribution. The eleven elements include cosmopolitan(26, 9.15%), North temperate(36, 12.68%), North temperate-South temperate(30, 10.56%), Palaeotemperate(16, 5.63%), Eastern Asian-Northern American(11, 3.87%), Eastern Asian(84, 29.58%), Pantropical(28, 9.86%), Palaeotropical(6,2.11%), Tropical Asian-Papua New Guinea(11, 3.87%), Eastern Asian-Tropical Asian-Papua New Guinea(6, 2.11%), Eastern-tropical Asian-Australian-Ocean(11, 3.87%) and other unknown(19, 6.69%). Among these eleven elements, eight accord with the concepts proposed by Wu ZY. However, tropical Asian element was special, cover larger regions than spermatophytes of the same element. Therefore, the tropical Asian element of the bryophytes recorded in the Zhoushan archipelago was further divided into three groups.