Marine shrimps,major fish preys,are important for marine ecological system. Generalized additive model (GAM) was used to analyze the relationship between crustaceans and environment factors,and to predict the distribution of dominance crustaceans in Ma′an Archipelago. Based on the model,the significant influence factors of Parapenaeopisis tenella were time and habitat type,and the significant influence factors of Squilla orarotia were habitat type,longitude,temperature and salinity. Time was the only significant influence factor of Palaemon gravieri. The distribution forecast map shows that the P.tenella biomass was higher in northeast of the survey area,and lower in the center area. Biomass of S.orarotia was higher in southeast area in March and in west area in October. The lower value of P.gravieri was in the center area,and the higher value was in surrounding area.%海洋虾类和虾蛄等甲壳类是许多鱼类的饵料生物,是海洋生态系统的重要组成部分.为了探索马鞍列岛海域优势甲壳类与环境因子之间的关系,文章基于广义加性模型(GAM)建立了甲壳类与环境因子的生态模型,并对甲壳类资源分布进行预测.结果表明,影响细巧仿对虾(Parapenaeopisis tenella)分布的主要因素是时间因素和底质,影响口虾蛄(Squilla orarotia)分布的主要因素包括底质、经度、温度和盐度,而影响葛氏长臂虾(Palaemon gravieri)分布的显著因素是时间因素.从分布格局来看,细巧仿对虾生物量低值出现在研究海域中间区域,高值出现在东北部海域;3月口虾蛄生物量在东南海域较高,而10月在西部海域较高;葛氏长臂虾分布低值出现在研究海域中间区域,高值海域环绕低值海域周围分布.
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