頁籤選單縮合
題名 | 關渡地區濱鷸鳥雌雄判別之統計分析 |
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作者姓名(中文) | 趙蓮菊; 張淑惠; 莊永泓; | 書刊名 | 中國統計學報 |
卷期 | 29:2 1991.09[民80.09] |
頁次 | 頁131-143 |
分類號 | 388.897 |
關鍵詞 | 判別; 雌雄; 濱鷸鳥; 關渡; |
語文 | 中文(Chinese) |
中文摘要 | 由於濱鷸鳥的性別無法由外觀得知,本文根據1988年9月至89年4月在台北關渡地區捕獲377隻濱鷸鳥的數據利用統計分析中混合族羣之最大概似估計法來決定如何以鳥嘴長或全頭長來判別濱鷸鳥的雌雄。A. 以鳥嘴長作分析之結果如下:(1)關渡地區雄性濱鷸鳥65%.雌性佔35%。 (2)雄性族羣平均鳥嘴34.06mm,標準差2.06 mm;雌性族羣平均鳥嘴37.31mm,標準差2.06mm。(3)若要求已知鳥嘴長判定雌雄正確機會至少為90% (80%)則判定法為:鳥嘴≦33.6(34.7)mm為雄性;鳥嘴≧39.4(38.3) mm;雌性。B.以全頭長作分析之結果如下:(1)關渡地區雄性濱鷸佔58%,雌性佔42% 。 (2)雄性族羣平均全頭長58.23mm,標準差2.19 mm ;雌性族羣平均全頭長61.55mm,標準差2.19 mm。(3)是要求已無全頭長判定雌雄正確機會至少再90% (80%)判定法為:全頭長為57.2(58.4) mm為雄性:全頭長為63.5(62.4)mm為雌性。 |
英文摘要 | Since it is not possible to sex Dunlin (Calidris alpina) on present knowledge unless by dissection, a statistical method (the maximum likelihood method for the mixture to two normal distributions) is presented to determine sex using the bill and total-head-length measurements of the birds. Based on the 377 distinct live dunlins captured in Kung-Du of Northern Taiwan shores during the time period of September 1988 to April 1989, we obtained the following: A. Results based on billlength: (1)the proportion of male Dunlin in this area is 65% and 35% for female Dunlin; (2) the mean bill length for male is 34.06 and 37.31 mm for female, with a common S. D. 2.06 mm; (3) if we request that for given bill length the probability of sexing correctly is 90% (80%), the sexing criterion is: males□33.6 (34.7) mm. females □ 39.4 (38.3) mm in this area. B. Results based on total-head-length: (1) the proportion of male Dunlin in this area :5 .58% and 42% for female Dunlin (which agrees well with the results the results using bill length); (2) the mean total-head-length for male is 58.23 and 61.55mm for female, with a common S. D. 2.19 mm; (3) if we request that for given total-head-length the probability of sexing co¬rrectly is 90% (80%),the sexing criterion is: males □57.2 (58.4) mm, female □ 63.5 (62.4)mm. |
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