三种荒漠蜥蜴空间和营养生态位研究

同一荒漠蜥蜴群落中，荒漠沙蜥（Ｐｈｒｙｎｏｃｅｐｈａｌｕｓｐｒｚｅｗａｌｓｋｉｉ）和虫纹麻蜥（Ｅｒｅｍｉａｓｖｅｒｍｉｃｕｌａｔａ），密点麻蜥（Ｅｒｅｍｉａｓｍｕｌｔｉｏｃｅｌｌａｔａ）占不有同的空间生态位，其间几乎不存在竞争。两个近缘种虽然占有相同空间生态位，但个体大的密点麻蜥食物种类特化，个体小的虫纹麻蜥偏重于利用较小的食物资源。占有相同空间生态位的近缘种，营养生态位向不同方向特化，利用不同的食物资源，从而在竞争中共存，保持群落结构的稳定性。

SPATIAL AND TROPHIC NICHES OF THREE SPECIES OF LIZARDS IN DESERT

he spatial and trophic niches of Phrynocephalus przewalskii ,Eremias multiocellata andEreimas vermiculata were investigated and studied in Minqin desert of Gansu from ApriI toOctober 1989 and in July and August 1990,in order to reveal coexistent mechanism of lizardspecies in the same desert communities. The spatial niche was divided into two dimensions,including ground temperature aiid vegetation coverage,The trophic niche was also dividedinto two dimensions of food kinds and diet sizes. P. przewalskii occupies all different spatial niches from E. multiocellata and E. vermicu-lata in two dimensions of spatial niche.In the spatial niche there is no competition betweenP. przewalskii and two close relative species. Both of two close relative species have occupiedthe same spatial niche but kinds of diet of E. multiocellata with a greater body size are spe-cialized , whereas E. vermiculata with smaller body size partially preys on smaller food re-sources. The trophic niche of close relative species that occupy the same spatial niche is spe-cialized in variant channels. Because of the specialization of trophic niche , the close relativespecies can competively coexist in the same desert communities so that the community struc-ture is steadily maintained.