Zhang Heng, Ye Jin Yu, Zhang Ying Ying, Jin Shao Fei, Zhang Sheng Mao
Ministry of Agriculture Key Laboratory of Oceanic and Polar Fisheries, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China.
Ying Yong Sheng Tai Xue Bao. 2018 Mar;29(3):945-952. doi: 10.13287/j.1001-9332.201803.033.
We examined the temporal and spatial variation in the abundance and diet composition of Acanthogobius ommaturus at three subhabitats (mudflat, salt marsh, and creek) of the Dongtan wetland of Yangtze Estuary with monthly field samplings from July 2015 to June 2016. The results showed that the samples of A. ommaturus were mainly composed of young individuals in the period of June-November, whereas no fish was collected during the other months. Most of the samples were collected in July (71) and only three individuals was collected in November. Most of the samples were collected (93) in creek, which was 5.2 and 4.9 times of those in mudflat and salt marsh, respectively. The diet of the A. ommaturus included 10 taxa and 30 prey species, dominated by shrimps. In the taxonomic level, the dominant preys were the Exopalaemon annandalei or other Exopalaemon sp. of shrimps, the Sesarma sp. of crabs and Micromecta quadriseta of insects. Compared with other taxonomic groups, the fish prey had relatively higher mass percentage but lower abundance percentage. The prey composition of A. ommaturus differed among subhabitats. The feeding level of A. ommaturus increased gradually from July to November and reached 3.0 in late autumn. The differences in the abundances of A. ommaturus among subhabitats would be induced by prey composition.
2015年7月至2016年6月，我们每月在长江河口东滩湿地的三个亚栖息地（泥滩、盐沼和溪流）进行实地采样，研究了成熟棘头虾虎鱼的丰度和饮食组成的时空变化。结果表明，6月至11月期间，成熟棘头虾虎鱼样本主要由幼鱼个体组成，而其他月份未采集到鱼类。大部分样本在7月采集（71个），11月仅采集到3个个体。大部分样本（93个）在溪流中采集，分别是泥滩和盐沼采集数量的5.2倍和4.9倍。成熟棘头虾虎鱼的食物包括10个分类单元和30种猎物，以虾类为主。在分类水平上，主要猎物是安氏白虾或其他白虾属的虾类、相手蟹属的蟹类和四刺微口螺属的昆虫。与其他分类组相比，鱼类猎物的质量百分比相对较高，但丰度百分比较低。成熟棘头虾虎鱼的猎物组成在亚栖息地之间存在差异。成熟棘头虾虎鱼的摄食水平从7月到11月逐渐增加，在深秋达到3.0。亚栖息地之间成熟棘头虾虎鱼丰度的差异将由猎物组成引起。
