Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/22436
標題: 孵卵時期環境溫度對斑龜蛋孵化、幼龜性別與雌雄體型二型性之影響
The Effects of Incubation Temperature on Egg Hatching, Sex Determination and Sexual Size Dimorphism in the Chinese Stripe-Necked Turtle, Ocadia sinensis
作者: 林奕甫
Lin, Yi-Fu
關鍵字: sexual size dimorphism
雌雄體型二型性
sex determination
growth rate
activity
Testudines
Ocadia sinensis
性別決定機制
成長率
活動力
龜鱉目
斑龜
出版社: 生命科學系所
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摘要: 爬蟲類中,普遍存在著雌雄體型二型性(sexual size dimorphism, SSD)及溫度決定性別(temperature sex determination, TSD)的現象。造成SSD的原因,除了出生時體型大小、幼體及成體時期成長率、成熟所需體型大小及年紀等外,孵卵時期環境溫度也可能造成雌雄體型的差異。前人研究顯示高溫孵出個體體型較大,低溫孵出者體型較小,因此TSD種類所表現的SSD,可能也與孵化溫度有關 臺灣四種淡水龜科中,斑龜(Ocadia sinensis)性別決定機制尚未知。斑龜成龜體型為雌龜大於雄龜。因此本研究選擇斑龜為實驗對象,希望瞭解其性別決定機制,及瞭解孵卵時期溫度與成長率、活動力等之關係。 我設置五個不同溫度環境的孵蛋實驗(24℃、26℃、28℃、30℃、32℃)以瞭解不同孵卵溫度是否會影響龜蛋孵化、幼龜性別、出生體型、活動力及初期成長率。 結果顯示,斑龜屬於TSD物種,孵卵時期環境溫度為30℃及32℃時,皆孵出雌龜;而24℃時,孵出之幼龜皆為雄龜。32℃時所需的孵化天數最短(46.1 ± 1.6天),24℃所需的天數最長(90.8 ± 2.6天)。孵化成功率及出生體型大小,不受孵卵時期溫度影響。 孵卵時期溫度越高,翻身活動力越強。出生體型大小及活動力,與個體成長率無顯著相關。孵卵時期溫度越高,幼龜初期成長率越快,所以孵卵時期環境溫度可能是造成斑龜雌雄體型差異的因子之一。然而,同性別在不同溫度的成長率無顯著差異,顯示性別本身也是影響成長率的因子。
Sexual size dimorphism (SSD) and temperature sex determination (TSD) are common in some reptile groups (e.g. turtles and crocodiles). SSD may result from hatchling size differences, juvenile and adult growth rates, age and size at maturity, and incubating temperatures. It has been demonstrated that eggs incubated in high temperatures produce larger hatchlings, it is possible that SSD found in TSD species may result from the difference in incubation temperature. Among the four batagurid turtles found in Taiwan, the sex determination mode of the Chinese Stripe-Necked Turtle, Ocadia sinensis, is unknown. It is known that the size of females is larger than that of males in this species. In this research, I plan to determine the sex-determination mechanism of Ocadia sinensis, and, to understand the relationship between incubation temperature of eggs and juvenile growth rate and activity performance. I designed incubation experiments at five different temperatures (24℃、26℃、28℃、30℃、32℃) in order to determine the effects of incubation temperature on hatching success, sex ratio, hatchling body size, activity performance, and juvenile growth rate. I demonstrated that Ocadia sinensis is a TSD species; at incubating temperatures of 30℃ and 32℃, all hatchlings are females; all hatchlings are males when eggs are incubated at 24℃. Eggs hatched the fastest when incubated at 32℃ (46.1 ± 1.6 days), longest when at 24℃ (90.8 ± 2.6 days). Hatching success and the size of hatchlings are not influenced by incubation temperatures.. The activity performance of juveniles hatching at higher temperatures is higher than those hatching from lower temperature. Growth rate is faster in individuals hatching from high temperatures. There is no significant difference between individual growth rate and size of hatchling or activity performance of juveniles. Since growth rate is faster in high incubation temperatures than in low temperatures, incubation temperature could be one of the factors that cause SSD. However, there is no significant within-sex difference in growth rate among hatchlings incubated at different temperatures. It indicates that gender itself is one of the factors that influence growth rate.
URI: http://hdl.handle.net/11455/22436
其他識別: U0005-2607200615134000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2607200615134000
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