- 期刊
No Divergence of Habitat Selection between Male and Female Arboreal Snakes, Trimeresurus s. stejnegeri
赤尾青竹絲（Trimeresurus S. Stejnegeri）兩性之微棲地選擇探討
摘要
動物的兩性在體型上有差異，這樣的差異有助於兩性選擇不同的棲地環境，以降低種內的競爭壓力。體重是蛇類適應樹棲生活的重要因素，因為較輕的體重可以讓牠們使用較廣泛的樹上環境。赤尾青竹絲（Trimeresurus s. stejnegeri）的是樹棲蛇類，其雌蛇比雄蛇大且重，因此我們推測雌蛇的棲息高度可能較雄蛇為低，或者雌蛇棲息的枝徑會較雄蛇為粗。我們定期在二個野外樣區和一個戶外圈養場內，觀察記錄牠們的微棲地資料，如離地高、枝徑、枝條數、溫度和濕度等，從1996年8月到隔年10月共觀察202隻性成熟的赤尾青竹絲，最多並記錄到872次的離地高資料，結果和我們的預期不吻合，兩性在所有測量的微棲地介質都沒有顯著的差異。兩性的體型差異不夠大，以及棲息植物的枝條結構，可能是導致此負面結果的原因。
並列摘要
Sexual dimorphism in body size is a common phenomenon among animals, and possibly allows the sexes to exploit different habitats. In snakes, low body mass is valuable for arboreal life because it enables the exploitation of a wider range of habitats. Therefore, we would predict that larger and heavier female arboreal snakes, Trimeresurus s. stejnegeri, may use thicker or lower branches than males. We visited 2 field-sampling sites and 1 outdoor enclosure regularly to check the micro-habitats that were used by adult T. s. stejnegeri. Totally 872 observations of 202 mature snakes were recorded from August 1996 to October 1997. The results contradicted our expectation. No difference in habitat selection between females and males was found in the measured parameters. Limited differences in size between the sexes and the physical structure of plants may account for this negative result. All snakes perched on thinner twigs more frequently than thicker branches. Twigs of diameter larger than 2 cm were rarely used by snakes. We found a significant vertical movement between day and night by the individuals in all 3 locations. Snakes in the outdoor enclosure showed a greater tendency to perch on higher branches than did those in the field. In the field, more than 93% of snakes were found at a height of less than 4 m. However, less than 64% of snakes were found within 4 m of the ground in the outdoor enclosure.
延伸閱讀
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