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系統識別號 U0026-0812200911125808
論文名稱(中文) 台灣四草河口流紋蜷 Thiara riqueti (Grateloup, 1840) (Mesogastropoda, Thiaridae) (中腹足目、錐蜷科)生命表與族群動態之研究
論文名稱(英文) Life Tables and Population Dynamics of Thiara riqueti (Grateloup, 1840) (Mesogastropoda, Thiaridae) in the Su-Tsao Estuary, Tainan, Taiwan
校院名稱 成功大學
系所名稱(中) 生物學系碩博士班
系所名稱(英) Department of Biology
學年度 92
學期 2
出版年 93
研究生(中文) 鄭仲堯
研究生(英文) Chung-Yao Cheng
電子信箱 s2411985@ms26.hinet.net
學號 l5691403
學位類別 碩士
語文別 英文
論文頁數 115頁
口試委員 指導教授-王建平
指導教授-齊心
召集委員-簡錦樹
口試委員-賴雪端
中文關鍵字 生命表  流紋蜷 
英文關鍵字 life table  Thiara riqueti 
學科別分類
中文摘要   本研究於2000-2004年間在台灣台南四草野生動物保護區探討流紋蜷 Thiara riqueti (Grateloup, 1840) (Mesogastropoda, Thiaridae) 的生命表、族群動態與環境因子的關係。以age-stage, two-sex life table 為主,探討實驗室中不同溫度 (10℃、18℃、25℃、30℃) 與鹽度 (0.2﹪、1.0﹪、2.0﹪、2.5﹪、3.0﹪、4.0﹪、5.0﹪) 以及野外環境中之流紋蜷生命表。結果顯示在實驗室內以30℃與鹽度2.0﹪條件下為最佳,其內在增長率 (the intrinsic rate of increase, r)、終極增長率 (the finite rate of population increase, λ)、淨生殖率 (the net reproductive rate, Ro) 和平均世代時間 (the mean generation time, T) 分別為0.1412 week-1、1.1516 week-1、56.33 子代數和28.65 weeks。野外生命表中以不感潮的樣區 B 為最佳,其內在增長率、終極增長率、淨生殖率和平均世代時間分別為0.1441 week-1、1.155 week-1、5.50子代數和11.84 weeks。由實驗結果之流紋蜷族群參數值 (population parameters) 顯示族群生殖策略應屬於r型。流紋蜷族群在四草河口體長超過4mm才有懷孕紀錄。野外懷孕率之高峰期主要集中於夏、秋兩季而且以體長 9.0-14.0mm的貝類為主要生殖族群。溫度增高時會提高其生殖率,但高於鹽度4.0﹪時,生殖率會降低。由多變量逐步複迴歸分析結果顯示生殖率受到溫度與鹽度影響 (r2=0.866, P<0.05)。於四草河口地區野外族群高峰期主要出現在夏季與秋季並顯示出季節性差異,各棲地間,在鹽沼、溝渠和魚塭樣區(A, B, C, H 和I)中之族群量較穩定。嘉南大排樣區 (G)、運河鹽道 (E和F) 和四草大橋樣區 (J) 因為直接受到潮汐與水流等環境因子影響,所以流紋蜷族群明顯較低。多變量逐步複迴歸分析結果顯示環境因子對樣區 (A, B和C)中流紋蜷族群有明顯影響,樣區 A 中主要受到硫酸鹽、溶氧和pH值的影響 (r2=0.486, P=0.000),樣區 B 中主要以鹽度與pH值為主 (r2=0.471, P=0.002),樣區 C中主要以硝酸鹽與鹽度為主 (r2=0.507, P=0.006)。本研究顯示透過生命表之研究,可以解釋四草地區流紋蜷族群動態受到河口生態系中不同棲地類型與環境因子的影響。
英文摘要   The cohort life table and the population dynamics of the gastropoda snail Thiara riqueti (Grateloup, 1840) in Su-Tsao estuary in Tainan and Taiwan were studied during July 2000 and 2004. The cohort life histories of the Thiara riqueti at four temperature and seven salinity combinations were analyzed based on the age-stage, two-sex life table to take into consideration the variable development rates among individuals. At 30℃ and salinity 2.0%, the intrinsic rate of increase (r) is 0.1412 week-1, while the finite rate of population increase (λ) is 1.1516 week-1. The net reproductive rate (Ro) is 56.33 offspring and the mean generation time (T) is 28.65 weeks. These population parameters shows that temperature 30℃ and salinity 2.0% is the best condition among all treatments. Among different wild habitats, the habitat B offers the best condition for T. riqueti and the intrinsic rate of increase, the finite rate of population increase, the net reproductive rate and the mean generation time are 0.1441 week-1、1.155 week-1、5.50 offspring and 11.84 weeks, respectively. The population parameters suggested that T. riqueti is r-strategist. This species shown a single peak of recruitment per annum during the period of summer to fall. In Su-Tsao estuary, only female T. riqueti were observed, as is typical of most population of this species. Snails with shell length over 4.0mm had full-developed larvae in the brood pouch during the study period. Temperature and salinity are the major environmental factors for fecundity. The lowest densities were found in the habitats E, F and G and the highest ones in habitats A, B, C and I during the study period. The population densities in habitats A, B and C were influenced by the sulfate, dissolved oxygen, pH, salinity and nitrate during 2000-2001. Evidence was found that the life table and population dynamics of T. riqueti were dependent on the seasonal variation of environmental factors of the estuary hydraulic regime.
論文目次 CHINESE ABSTRACT I
ENGLISH ABSTRACT III
ACKNOWLEDGEMENT V
LIST OF TABLES VIII
LIST OF FIGURES IX

Introduction 1

Ecosystem of study area 4

Materials and Methods 6
Laboratory experiments 6
Life Table 6
Wild life table 7
Fecundity responses to change in temperature and salinity 7
Field experiments 8
The change of population structure of T. riqueti in field 8
Population dynamic of snails at different habitats 8
Fecundity of the wild population 9
The movement of T. riqueti population 10
Data analysis 10
Life Table Analysis 10
Environmental factors analysis 11

Results 12
Life Table 12
Wild life table 13
Fecundity responses to change in temperature and salinity 14
Density, fecundity and size structure of field population 14
Monthly Thiara riqueti population dynamic
and environmental factors variation 15
Correlation between environmental factors and population dynamics 16
Pregnant rate of wild snails 16
The hibernated population and vertical movement of snails in soil 17

Discussion 18
Life Table 18
Fecundity and population variation 20
Correlation between environmental factors and population dynamics 21
Migration 23

References 25
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