碩士 / 國立高雄師範大學 / 生物科學研究所 / 90 / Periphyton was incubated under high（80 ~ 100 %）, medium（40 ~ 60 %）, and low（0 ~ 20 %）canopy ratio in two tributaries of Pasagalu stream in Nan-jen-shan Nature Reserve from December, 2000 to November, 2001 to investigate the species composition, growth rate, and influence factors of benthic algae in lotic waters of Taiwan. Twenty-nine species in twelve genus of diatom and two species in two genus of green algae was identified in this annual study. Despite the difference in season, tributaries, and canopy types, silicon algae is dominant in species composition, with the major species of Cocconeis placentula var. euglypta. The total cell number of algae is not abundance; however, the species diversity is high during the early stage of periphyton incubation. In different seasons, the highest value of species diversity is commonly appeared in the 11 — 21 incubation days, but gradually decreases in the following collections. Based on the dendrogram of cluster analysis, the effects of season and canopy types on the spatio-temporal variation of species composition for benthic algae is more significant than tributary in Pasagalu stream. The chlorophyll a concentration is increase in accordance with the decreasing of riparian canopy. However, the maximum chlorophyll a concentration is recorded between 2.5 — 3 μg/cm2 in spite of the canopy ration. Through the observation of a long-term culture, approximately 140 incubation days is estimated for reaching the maximum chlorophyll a concentration under the condition of high riparian canopy. Although the riparian canopy is important, the other environmental factors, like flow velocity, nutrient content, did not show strong correlation with the growth rate in Pasagalu stream. Nutrient content in Pasagalu stream is higher compared to those in North America; however, periphyton production is maintained relatively stable in the former one. Difference in species composition maybe attributed to the higher nutrient but lower periphyton production in Pasagalu stream, which is varied from the studies documented from North America. Moreover, the selected materials for algal colonization will also affect the species composition and growth rate of periphyton. Thus, adopt same material for periphyton colonization for studying or comparing species composition of benthic algae in stream is necessary in the future.
| Identifer | oai:union.ndltd.org:TW/090NKNU0112011 |
| Date | January 2002 |
| Creators | Ya-Yu Cheng, 鄭雅鈺 |
| Contributors | Shih-Hsiung Liang, 梁世雄 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 64 |
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