台灣西北部河口處雙扇股窗蟹之族群動態

雙扇股窗蟹(甲殼綱;十足目;毛帶蟹科)(Scopimera bitympana) 是沙灘上重要的生物擾動者，也是台灣沙灘常見的物種。本實驗之目的在於了解雙扇股窗蟹的族群動態，實驗地點位於淡水河口南岸的挖仔尾，以兩個樣區作為實驗的重複。實驗時間從2006年三月至2007年十月，共進行20個月。每個樣區各設置三條30公尺的穿越線，樣線均與海岸平行(分別於高、中、低潮位)，每條樣線隨機選取20個25×25cm樣框，共計60個樣框。在樣框中收集之股窗蟹均測量其頭胸甲。結果顯示，雙扇股窗蟹的數量有季節性的變化，在夏季時比較多而冬季時減少。繁殖時間為每年的三月到十月，而在此期間，抱卵母蟹的比例會出現兩次高峰。雙扇股窗蟹的幼蟹主要在四月到十月間出現，而幼母蟹最快兩個月後抱卵，加入該年的繁殖。本次實驗結果顯示，溫度是主要影響雙扇股窗蟹族群動態的主要環境因子，而其他環境因子例如沙子的粒徑的變異與鹽度的變化，對雙扇股窗蟹的影響均較小。

關鍵字

雙扇股窗蟹；族群動態；沙粒徑大小；繁殖時間；抱卵母蟹

並列摘要

Sand bubbler crab, Scopimera bitympana (Decapoda: Crustacea: Dotillidae), is an important bioturbator and a common species on sandy shores in Taiwan. The experiment was carried out in Danshui River. Two sites were chosen for replicates. 20 months sampling from March 2006 to October 2007 took apart during low tides. Three 30m transects paralleled to shore were set at high, mid and low shore and 20 (25 × 25cm) quadrats were randomly chosen for each transect. 60 quadrats were sampled in a month at each site. Abundance of S. bitympana had seasonal variations which was higher in summer and decreased in winter. Reproductive period was from March to October and the percentage of ovigerous females had two pulses during one reproductive period. Recruitment of S. bitympana presented from April to October, then the females matured and joined reproduction in the first year. In present study, the effect of temperature on population dynamics of S. bitympana was probably larger than sand grain size or salinity.

並列關鍵字

Scopimera bitympana ； population dynamics ； sand grain size ； reproductive period ； ovigerous female

參考文獻

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延伸閱讀

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台灣西北部河口處雙扇股窗蟹之族群動態

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