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題 名 | Variations of Reproductive Traits of Two Semi-Terrestrial Isopods, Ligia Exotica and L. Taiwanensis (Crustacea: Ligiidae), in Southern Taiwan=恆春半島兩種海蟑螂Ligia Exotica及L. Taiwanensis之生殖特徵的變異 |
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作 者 | 蔡明利; 陳弘成; | 書刊名 | 動物研究學刊 |
卷 期 | 36:1 1997.01[民86.01] |
頁 次 | 頁33-41 |
分類號 | 387.1 |
關鍵詞 | 等腳類; 海蟑螂; 生殖特徵; 生活史演化; Ligia; Reciprocal relationship; Life-history evolution; |
語 文 | 英文(English) |
中文摘要 | 比較兩種海蟑螂Ligia exotica(Roux)和L.taiwanensis(Lee)的生殖特徵。棲息在山溪間的 L. taiwanensis較棲息在海岸潮間區之L. exotica每單位體重(weight-specific)能生產較重的卵(F 1, 198=166, p<0.001);以及較小(F 1,198=706, p<0.001)的生殖貢獻(reproductive allocation)。似乎L. Taiwanensis在卵的大小及生殖貢獻兩種生殖特徵上,相對地比 L. exotica 合乎理論上 K- 選擇的預測(the predictions for K-selected by the theory)。 當體型大小(body size)這個影響生殖特徵的因子以統計的方法移除後, 兩種海蟑螂在卵數(fecundity)和窩卵重(brood weight)之間均存在有顯著地正的相關性;卵數(fecundity)和卵重(egg weight)之間均存在有顯著地負的相關性; 但在卵重(eggweight)與窩卵重(brood weight)之間則均無相關性。這個結果顯示一種互換(trade-off)的關係存在於卵的數目與大小之間,結果似乎合於生活史演化(life-history evolution)的最適性理論(the optimality theories)。 |
英文摘要 | Both inter-and intraspecific reproductive traits of 2 semiterrestrial isopods were examined and compared in an attempt to provide insights into the adaptive strategies of reproduction. Gravid females of Ligia exotica (Roux) from the littoral zone and Ligia taiwanensis (Lee) from mountain brooks show differences in reproductive allocation per brood (F1, 198=706, p<0.001) , weight-specific egg weight (F1,198=166,p<0.001),and weight-specific fecundity (F1,198=120,p<0.001),but they also display similarities in the interrelationships between reproductive traits. The reproductive traits of L. taiwanensis, such as larger weight-specific egg size and lower reproductive allocation, seem more in accordance with theoretical predictions for K-selected traits than those of L. exotica. When the effects of body size are removed, both species show a significant positive correlation between fecundity and brood weight (L. exotica: r= + 0.49, t=5.50, p<0.001; L. taiwanensis: r=+0.96, t=36.09, p<0.001), and a negative correlation between fecundity and egg size (L. exotica: r=-0.77, t=11.78, p<0.001; L. taiwanensis: r=-0.32, t=3.41, p<0.001) intraspecifically. The reciprocal relationships between egg size and fecunidity in L. exotica and L. taiwanensis seem to match the assumption of optimality theories of life-history evolution. |
本系統中英文摘要資訊取自各篇刊載內容。