Ecological Study and Biotic Index of Aquatic Insects in the Chishan River
| Autor: | Chun-Yi Pan, 潘俊逸 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 The Chishan River originated from southwestern bound of Mt. Jade. It is one of the four major tributaries of the Kao-Ping River. The watershed area is about 802 km2 and the lengh of the river is 117 km. Due to the anthropogenic activity in the past few decades, the Chishan River is contaminated by agricultural activity, improper land development, and illegal disposal of wastes. The objective of this study is to investigate the species composition and distribution of the aquatic insects, to monitor the change of community structure of aquatic insects in one-year study, and to establish the biotic index specific for the Chishan River. The study was conducted during January to December, 2002. Seven sampling sites were selected from upstream to downstream. Monthly sampling of aquatic insects was classified in the laboratory. Water quality monitoring was conducted seasonally in March, June, September, and December, respectively. Water quality parameters such as temperature, pH, conductivity, dissolved oxygen, biochemical oxygen demand (BOD5), suspended solid, ammonia nitrogen, and semivolatile organic compounds were analyzed. River pollution index (RPI), EPT (Ephemeroptera, Plecoptera, and Trichoptera) richness, Hilsenhoff biotic index (HBI), and family-level biotic index (FBI) were employed to assess the water quality of the river. Based upon the method proposed by Lenat in 1993, the tolerance value of aquatic insect species in Chishan River is amended by the index of EPT richness. The results indicated that 84 species of aquatic insects including 8 orders, 30 families, and 53 genera were classified in Chishan River. Twenty six species of Ephemeroptera was found, which represents 31% of the total species. The larvae of Trichoptera are the most abundant species. There are 7216 of Trichoptera collected, which represents 70% of the total number of aquatic insects collected in this study. The monthly change of the insect number suggested that the number increased in spring and fall, and declined in summer and winter. This study established EPT richness criteria for assessing water quality classification in Chishan River and validated the tolerance value of 30 species of aquatic insects. Based upon the tolerance value generated, the biotic index of Chishan River (CSBI) was developed. It is observed that the CSBI correlated well with HBI. The RPI results indicate that most of the sections in the Chishan River were not contaminated. Detailed classification of the uncontaminated sections of the river was performed by EPT richness, HBI and CSBI. The assessment illustrated that upper stream (site 1) contains the best water quality. However, water quality of down stream (site 7) was the worst along the river. It is summarized that FBI and EPT richness can be employed in the preliminary assessment. Nevertheless, detailed assessment and long-term monitoring should be based on HBI and CSBI in aquatic insect ecological study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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