Journal of East China Normal University(Natural Science) ›› 2021, Vol. 2021 ›› Issue (2): 160-170.doi: 10.3969/j.issn.1000-5641.2021.02.016

• Ecological and Environmental Sciences • Previous Articles    

Distribution characteristics and influencing factors of crabs and crab burrows in the Fengxian coastal wetland

Xiang LI1,2(), Huimin TIAN1,2, Jingying WU1,2, Siyu CHEN1,2, Mingming ZHAO1,2, Ping XU1,2, Xuechu CHEN1,2, Wenhui YOU1,2,*()   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
    2. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China
  • Received:2020-05-29 Online:2021-03-25 Published:2021-04-01
  • Contact: Wenhui YOU E-mail:sally_li1994@163.com;whyou@admin.ecnu.edu.cn

Abstract:

This study investigated the distribution characteristics and influencing factors of crabs and crab burrows in Fengxian coastal wetland to reveal the main influencing factors in crabs’ and crab burrows’ distribution and deepen the understanding of crabs’ living habits. The results showed that: ① The abundance of Helice tientsinesis in the high-marsh Phragmites australis habitat is higher than that in the middle-marsh Phragmites australis -Spartina alterniflora mixed habitat and low-marsh Spartina alterniflora habitat (p < 0.01). However, there is no significant difference in the abundance of Sesarma plicate between habitats (p > 0.05). ② The density of crab burrows in the high-marsh Phragmites habitat is significantly higher than that in the middle-marsh Phragmites-Spartina mixed habitat and the low-marsh Spartina habitat (p < 0.05), while the average opening diameter of crab burrows is significantly lower than that in the middle-marsh Phragmites -Spartina mixed habitat and the low-marsh Spartina habitat (p < 0.05). ③ There is no significant linear relationship between crab abundance and the density of crab burrows( p > 0.05), while there is a significant positive correlation between the density of crab burrows and the abundance of Helice tientsinesis ( p < 0.01). ④ Crab abundance is negatively correlated with plant underground biomass ( p < 0.01). ⑤ There is a negative correlation between the density of crab burrows and vegetation coverage and plant density. The relative elevation, water content, conductivity, total organic carbon content, and total nitrogen content are positively correlated with the density of crab burrows. Among these factors, the relative elevation is the habitat factor with the highest correlation with the density of crab burrows.

Key words: coastal wetlands, crabs, crab burrows, distribution characteristics, impact factors

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