Effects of changing environments of mangrove creeks on fish communities at Trat Bay, Thailand

被引:15
|
作者
Singkran, N
Sudara, S
机构
[1] Cornell Univ, Dept Nat Resources, Ithaca, NY 14853 USA
[2] Chulalongkorn Univ, Dept Marine Sci, Bangkok 10330, Thailand
关键词
fish communities; land uses; mangroves; shrimp farming; water quality; Thailand;
D O I
10.1007/s00267-003-0173-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Effects of changing environments of riverside mangroves, coastal land uses, and water quality on fish communities were studied in Bangphra and Thaprik creeks, Trat Bay, Thailand. Regression analysis revealed that fish species richness in the wet season had a negative relationship with water transparency, nitrate, and phosphate and a positive relationship with zooplankton. In the dry season, species richness had a negative relationship with nitrate and phosphate and a positive relationship with salinity, pH, and zooplankton. Abundances and species richness of fish declined over distance from downstream to upstream in both creeks. Riparian mangroves and water quality also declined with distance upstream in both creeks. Results from one-way analysis of variance and Tukey's HSD test revealed that the highest zooplankton volume with the lowest amounts of nitrate and phosphate were observed at the downstream station in both creeks in each season. Low zooplankton volume with high amounts of nitrate and phosphate were found at the midstream and upstream stations of the creeks. The midstream and upstream stations of Bangphra Creek had low to moderate abundance of mangroves along the riversides, whereas shrimp farms were mainly found along the riversides at the midstream and upstream stations of Thaprik Creek. Correlation analysis results of land-use types and the significant habitat factors were discussed. This study found that mangrove degradation, shrimp farming, and residential and agricultural areas altered water quality and the health of fish habitats, causing the decreases in fish abundance and species richness.
引用
收藏
页码:45 / 55
页数:11
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