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Articles by Zeng Yu
Total Records ( 2 ) for Zeng Yu
  ZENG Yu and LIU Huan-zhang
  By binocular microscope examination and hand-drawing, we observed the pharyngeal bones and teeth of 39 Gobininae species to explore their morphological variations and functional adaptation. The results showed that, in the Gobioninae, pharyngeal bones could be divided into three morphological types: wide, intermediate, and narrow; pharyngeal teeth into five morphological types: conical, molar, coarsely compressed, compressed and extremely compressed. Different types of pharyngeal bones and teeth cooperate together to deal with different types of food. Combination of the pharyngeal bones and teeth in the Gobioninae exhibit various types, and this variation occurring in trophic apparatus provides the diverse feeding organ adapting for the ecological resource utilization and the different types of dietary habits.
  Zeng Yu , Zhang Xin-Wen , Zhu Guang-Jian , Gong Yan-Yan , Yang Jian and Zhang Li-Biao
  In order to study the relationship between landmarks and spatial memory in short-nosed fruit bat, Cynopterus sphinx (Megachiroptera, Pteropodidae), we simulated a foraging environment in the laboratory. Different landmarks were placed to gauge the spatial memory of C. sphinx. We changed the number of landmarks every day with 0 landmarks again on the fifth day (from 0, 2, 4, 8 to 0). Individuals from the control group were exposed to the identical artificial foraging environment, but without landmarks. The results indicated that there was significant correlation between the time of the first foraging and the experimental days in both groups (Pearson Correlation: experimental group: r=-0.593, P<0.01; control group: r=-0.581, P<0.01). There was no significant correlation between the success rates of foraging and the experimental days in experimental groups (Pearson Correlation: r=0.177, P>0.05), but there was significant correlation between the success rates of foraging and the experimental days in the control groups (Pearson Correlation: r=0.445, P<0.05). There was no significant difference for the first foraging time between experimental and control groups (GLM: F0.05,1=4.703, P>0.05); also, there was no significant difference in success rates of foraging between these two groups (GLM: F0.05,1=0.849, P>0.05). The results of our experiment suggest that spatial memory in C. sphinx was formed gradually and that the placed landmarks appeared to have no discernable effects on the memory of the foraging space.
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