鼓翅皱膝蝗生态学特性研究

ECOLOGICAL CHARACTERISTICS OF THE LOCUST, ANGARACRIS BARADENSIS (PALLAS) *

在甘肃省夏河县对鼓翅皱膝蝗的种群结构、数量变动、空间格局及动态进行了系统研究 .鼓翅皱膝蝗 1a发生 1代 ,以卵在土中越冬 .翌年 5月中旬开始孵化出土 ,6月上旬达到出土高峰 ,此期蝗虫种群仅由 1龄和 2龄蝗蝻组成 ,其中 1龄蝗蝻占 81.8% ,2龄蝗蝻占 18.2 % .成虫于 7月上旬开始羽化 ,8月上旬达到羽化高峰 ,此期的成虫数量达6 1.3 % ,而蝗蝻仅占 38.7% .蝗蝻期约为 72d ,成虫寿命 5 4d左右 ,每雌平均产卵 32 .6粒 .鼓翅皱膝蝗在草地上属聚集分布 ,蝗蝻发生期种群的空间动态主要表现出扩散趋势 ,但初孵化出土时有短暂的聚集行为 .取食量随龄期增大而增大 ,每头鼓翅皱膝蝗取食牧草量蝗蝻期平均约为 1.5 g ,成虫期约为 5 .8g ,成虫期的食量是蝗蝻期的 3 .7倍 .表 3参

The population structure and seasonal changes in number,spatial pattern and dynamics of Angaracris baradensis(Pallas) were studied in Ganjia High Mountain Grassland in Xiahe County, Gansu. The results showed that the locust species had only one generation in a year, and their eggs wintered in the soil and began to hatch in the second ten days of May each year, with the hatching peak period taking place in the first ten days of June. The early hatched nymphs became adults in the first ten days of July and started laying in the last ten days of July or the first ten days of August. The development of the nymphs underwent for about 72 days and the longevity of the adults lasted for about 54 days with 32.6 eggs laid per female. The spatial pattern belonged to aggregated distribution pattern. The daily food intake was 1.5 g at nymph stage and 5.8 g at adult stage. Tab 3, Ref 12