Globba lancangensis is a typical myrmecochorous perennial herb found in southwest China. In 2002 and 2003, seed dispersal by ants was examined. Twelve ant species were recorded and found to move seeds 0.01-3.35 m. This removal promoted seed dispersal. In 2003, ant exclusion was made in 4 of 8 study plots for 1 year to practically detect the effects of ant dispersal. As a result, nearest neighbor analyses indicated that although ant dispersal could not significantly change the mean nearest neighbor distance, it obviously reduced the clustering degree of seedlings. Spatial genetic structure (SGS) of mature plants in 2003 and sequent seedlings in 2004 were investigated with intersimple sequence repeats. The whole correlagram of all individuals from 2003 showed significant positive autocorrelations between genetic and geographical distances within 4 m, suggesting a patchy structure at such short distances in the studied population. This pattern is likely associated with limited seed dispersal. The comparative analysis of fine-scale correlograms (<4 m) for ant-excluded treatment indicated lacking ants as the primary dispersers could have a similar pattern to ant dispersal presence, which is likely due to the restriction of ant dispersal distance. In conclusion, ant-mediated dispersal contributes to reduce seedling clustering degree and plays a minor role in developing and maintaining the local SGS in G. lancangensis.

译文

兰科(Globba lancangensis)是在中国西南部发现的一种典型的多年生食虫性多年生草本植物。在2002年和2003年,研究了蚂蚁对种子的传播。记录了十二种蚂蚁物种,发现它们移动种子0.01至3.35 m。这种去除促进了种子的分散。 2003年,在8个研究小区中的4个进行了1年的蚂蚁排除,以实际检测蚂蚁扩散的影响。结果,最近邻分析表明,尽管蚂蚁散布不能显着改变平均最近邻距离,但明显降低了幼苗的聚集度。利用简单的序列重复进行了2003年成熟植物和2004年随后幼苗的空间遗传结构研究。从2003年开始,所有个体的整体相关图谱都显示4m以内的遗传距离与地理距离之间存在显着的正自相关,这表明在如此短的距离内,研究人群中的斑片结构。这种模式可能与种子散播受限有关。排除蚂蚁的处理的细尺度相关图(<4 m)的比较分析表明缺少蚂蚁,因为主要分散剂可能具有与蚂蚁分散存在相似的模式,这很可能是由于蚂蚁分散距离的限制所致。总之,蚂蚁介导的散布有助于降低幼苗的聚集程度,并且在澜沧G的局部SGS的发育和维持中起着较小的作用。

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