臺灣國際科展

有毛!沒毛!哪個好!?探討石田螺及其螺殼上附生藻類與環境因子之關係

科展類別
臺灣國際科展
屆次
2006年
科別
環境科學
學校名稱
臺北市立內湖高級中學
指導老師
高善
作者
潘怡誠
關鍵字
石田螺 附生藻類

摘要或動機

This research is about two ponds in the B park’s and the D park’s snail(Square Mystery Snail:Sinotaia quadrata) in Taipei city of Nei-hu District for research object, carry out the study of the following research proceed: 1.Discriminate the algae species that are growth on the snail shell and which is a kind of interaction with the snail; 2.The influence of the snail and algae with difference of temperature, salinity, pH value and dark ; 3. The factors affect algae growth on snail
shell; 4.Use the variation of snail and algae to be a biological incator. The result manifestation: the algae that are growth on snail shell have two kinds, one is Cyanophyta and the other is Cladophora sp. The interaction between algae and snail belong to communalism, but under the condition of lacking of food, the snail then will eat the Cladophora sp. which grow on the shell of other snails. The temperature adapts aspect, upper limit of the feat existence of the snail should be low in 28℃. When over than 28℃, Cladophora sp. as the most strong, Cyanophyta is secondly, and the snail then is most poor. For the maximum tolerance of the salinity, the snail is about 4.375?, Cyanophyta is about 5.0?, Cladophora sp is then about 7.0?; Under the different salinity for the tolerance , the Cladophora sp. still the most strong, Cyanophyta is secondly, and the snail then is most poor. Under the dark environment, the speed of Cyanophyta begin to be bleaching is very fast than the Cladophora sp.. In the tolerance of pH value range: The snail is about pH=5~10, Cyanophyta is about pH=7~8, Cladophora sp. is about pH=6~8; When the pH value range is in the pH=5~8, the speed of the Cyanophyta occur changing is very fast than Cladophora sp.. The algae are growing on snail shell very different between two ponds, the main reason is water pH value dissimilarly: When pH value over than 8.5, there is no Cladophora sp. to grow on the snail shell, after the pH value to decrease, Cyanophyta then will compare early than Cladophora sp. to grow on the snail shell. Calculate by the classification of the freshwater biological incator : Two organic pollution degree of the ponds may be lain in theβ-mesosaprobic to theα-mesosaprobic, and the polluting degree of the D pond is more seriously. As for two ponds, have already faced what level of eutrophication? Belong to actually which stage of pollution grade? Not only added the classification data of floating and fixative algea in two ponds, and also according to the parts of chemistry analysis method measure of the data makes the substantial evidence, then could carry out the more accurate and thorough study in the days to come steadily studying process.本研究是以臺北市內湖區兩個綠地公園(B公園與D公園)池塘內的石田螺(Sinotaia quadrata)為研究對象,進行以下研究目的之探討:1.鑑別石田螺螺殼上藻類的種類及其與石田螺的互動關係;2.溫度、鹽度、酸鹼值及黑暗等環境因子的差異,對石田螺及螺殼上附生藻類的影響;3.影響藻類附生於石田螺螺殼上的因素;4.將石田螺及螺殼上附生藻類的變化作為監測環境因子或水質變異的指標現象。結果顯示:附生於石田螺螺殼上的藻類有藍綠藻(Cyanophyta)與剛毛藻(Cladophora sp.)兩類;與石田螺的互動關係應屬於片利共生(communalism),但在缺乏食物的情況下,石田螺則會採食同伴殼上的剛毛藻。溫度適應方面,石田螺適宜生存的溫度上限應低於28℃,超過28℃水溫環境的耐受程度,是以剛毛藻為最強,其次是藍綠藻,而石田螺則為最差。對於環境鹽度最大耐受度方面:石田螺約為4.375??,藍綠藻約為5.0??,剛毛藻則約為7.0?;在不同鹽度環境下,鹽度的耐受程度,仍以剛毛藻為最強,其次是藍綠藻,而石田螺則是最差。在黑暗環境下,藍綠藻褪色產生白化現象的速度明顯地比剛毛藻要快了許多。在環境酸鹼值耐受的範圍方面:石田螺約在pH=5~10 之間,藍綠藻約在pH=7~8 之間,剛毛藻則約在pH=6~8 之間;而酸鹼值範圍在pH=5~8 時,藍綠藻產生變化的速度明顯地比剛毛藻還要快。而兩樣區池塘水體酸鹼值的不同,應是造成石田螺螺殼藻類附生現象差異的主要原因:當酸鹼值超過8.5 時,螺殼上就無剛毛藻附生,當酸鹼值降下後,藍綠藻則會比剛毛藻早出現在螺殼上。藉由淡水生物指標的分類推測:兩樣區池塘水體有機污染程度,可能介於β-中腐水性(β-mesosaprobic,βm)至α-中腐水性(α-mesosaprobic,αm)的範圍之間,而D池塘受污染的程度應會比B池塘還要更嚴重些。至於兩樣區池塘水體,已面臨了何種優養化的程度?究竟是屬於哪一個階段的污染等級呢?除須補充水體中浮游性及附著性藻類分類的詳細觀察資料外,仍必須參照部分水質化學分析法所測得的數據作佐證,才能在日後持續地研究過程中進行更精確及深入的探討。


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有毛!沒毛!哪個好!?探討石田螺及其螺殼上附生藻類與環境因子之關係 2 MB Adobe Reader(Pdf)檔案