摘要
2001年9月和2002年9月两次对巢湖河蚬和环棱螺的调查表明,在富营养化程度较重的西湖区,河蚬生物量分别为17.87和47.29g.m-2;环棱螺生物量分别为45.45和12.56g.m-2.而在富营养化程度较轻的东湖区,河蚬的生物量分别为67.86和96.18g.m-2;环棱螺的生物量分别为32.00和31.21g.m-2.河蚬和环棱螺的种群密度和生物量均随水体富营养化的加剧而下降.近岸带河蚬和环棱螺的密度和生物量明显高于敞水区.河蚬的分布型为核心型,而环棱螺更接近随机性分布.河蚬和环棱螺的种群密度和生物量与水深均无明显相关(P>0.05).环棱螺生物量与总氮TN、硝态氮NO3-N、总磷TP和溶解性磷PO4-P浓度呈显著负相关,而河蚬生物量仅与PO4-P呈负相关.现有河蚬资源量与1981年相比有较大幅度的下降.探讨了其它环境因子对河蚬和环棱螺分布和生长的影响.
The investigation on the distribution and population density of C. fluminea and Bellamya sp. in Chaohu Lake during September 2001 and September 2002 showed that in the west region of the lake where was seriously eutrophic, the density and biomass of C. fluminea were 5.1 ind. · m^- 2 and 17.87 g· m^- 2 in 2001, and 8.8 ind. ·m^-2 and 47.29 g·m^-2 in 2002, while those of Bellamya sp. were 13.3 ind.·m^-2 and 45.45 g·m^-2 in 2001, and 3.8 ind.·m^-2 and 12.56 g·m^-2 in 2002, respectively. In the east region of the lake where was eutrophic, the density and biomass of C. fluminea were 23.8 ind. · m^-2 and 67.86 g· m^-2 in 2001, and 29.2 ind.· m^-2 and 96.18 g· m^-2 in 2002, while those of Bellamya sp. were 10.1 ind.·m^-2 and 32.00 g· m^-2 in 2001, and 9.4 ind.· m^-2 and 31.21 g· m^-2 in 2002, respectively. The density and biomass of C. fluminea and t3eUamya sp. were declined with increasing eutrophication. In hypertrophic region, C. fluminea and Bellamya sp. were absent. The density and biomass of the two species were obviously higher in littoral than in pelagic region. The distribution type of C. fluminea was core-model, while that of Bellamya sp. was random. The correlation between the density and biomass of C. fluminea and Bellamya sp. and water depth was not significant（P 〉0.05）. The biomass of Bellamya sp. was negatively correlated with water TN（ P 〈 0.01 ）, NO3-N（ P 〈 0.05 ）, TP（ P0.01 ） and PO4-P（P 〈 0.05）, while that of C. fluminea only had a significantly negative correlation with .PO4-P（ P 〈 0.05）. Compared with 1981, there was fewer C. fluminea in the lake nowadays. The effects of other environmental factors on the population distribution and growth of C. fluminea and Bellamya sp. were also discussed.
出处
《应用生态学报》
CAS
CSCD
北大核心
2005年第8期1502-1506,共5页
Chinese Journal of Applied Ecology
基金
中国科学院知识创新工程重大资助项目(KZCX1-SW-12).
关键词
巢湖
河蚬
环棱螺
富营养化
Chaohu Lake, Corbicula fluminea, Bellamya sp., Eutrophication
