摘要
神农宫扁角菌蚊是首次发现并命名的洞穴昆虫新种,在洞穴内1a发生1代,幼虫期长达8—10个月。以神农宫扁角菌蚊为对象,系统研究了其幼虫种群在洞穴中的空间分布、季节分布及其与环境因子的相关性。分别采用了扩散系数(C值)法、K值法、平均拥挤度法、IwaoM*=α+βX回归模型分析法四种方法研究幼虫种群的空间分布,结果表明神农宫扁角菌蚊幼虫种群在洞穴中呈现典型的空间聚集分布。幼虫数量季节变化动态表现为春季幼虫数量明显高于其它季节,夏季5—6月份幼虫数量降到最低,蛹期、成虫期短,秋季幼虫开始孵化,幼虫数量持续上升。根据Pearson简单相关分析理论得出,神农宫扁角菌蚊幼虫数量与洞穴相对湿度、水流pH呈高度相关,而与洞穴温度、渗水pH呈低度相关,表明洞穴相对湿度、水流pH是影响幼虫种群分布的关键环境因子。
Chetoneura shennonggongensis（Diptera： Keroplatidae） is a recently described new cave species.It is univoltine（one generation per year） with an extended larval stage of up to 8—10 months.We studied the spatial and temporal pattern of a larval population of C.shennonggongensis.Furthermore,we also investigated various environmental factors that might explain the observed patterns.We used four different analytic methods to study the spatial pattern of the larval population,including the diffusion coefficient method（C value method）,the K value method,Average Congestion（M^＊） and the Iwao M^＊=α＋βx model.All these methods suggest an aggregated distribution of the larvae in the cave.The seasonal dynamics of C.shennonggongensis revealed highest number of larvae in spring and lowest numbers in summer,ie.May to June.The pupal and adult stage last very short.In autumn the larvae begin to hatch and the number increases continually.Finally,we carried out a correlation analysis between larval numbers and the seasonal changes of environmental factors using a Pearson Correlation matrix.The results showed a significant correlation of the larval numbers with the relative humidity and with the underground water pH of the cave,but no correlation with air temperature and the pH of infiltrating water from the top of the cave.This suggests that relative humidity and underground water pH might be key factors influencing the population distribution of C.shennonggongensis larvae.
出处
《生态学报》
CAS
CSCD
北大核心
2010年第24期6828-6834,共7页
Acta Ecologica Sinica
基金
教育部留学回国科研启动基金项目(4002-062029)
关键词
神农宫扁角菌蚊
空间分布
季节分布
相对湿度
水流pH
Chetoneura shennonggongensis
spatial pattern
seasonal pattern
relative humidity
underground water pH
