蟬（Hemiptera: Cicadidae）是植食性的昆蟲，且屬於同一同功群（guild）的物種。 本研究分成兩個部份，首先是探討在不同森林環境中蟬的群群聚組成。 樣地位於墾丁的龜仔角實驗林，我依據人為干擾程度和森林連續性，將研究區域劃分成三種森林環境：栽植林、破碎森林、和連續森林，共設置70個10m × 10m大小的樣方。 2005年4月開始，每1 ~ 2週採集一次樣方內的蟬蛻，蟬羽化後留下的蟬蛻是出現蟬種和數量的依據，且蟬蛻所在的樹，可當作判定土中若蟲所利用植物種類的指標。 樣方中採集到的蟬蛻有7種，包括薄翅蟬（Chremistica ochracea）、高砂熊蟬（Cryptotympana takasagona）、恆春姬春蟬（Euterpnosia koshunensis）、恆春羽衣蟬（Nipponosemia virescens）、台灣姬蟬（Purana apicalis）、台灣騷蟬（Pomponia linearis）、和小蟪蛄（Platypleura takasagona）。 研究結果顯示在栽植林中，平均每樣方出現的蟬種數和豐度最高，但蟬的多樣性和均勻度在連續森林中最高。 破碎森林的樹種組成雖近似於連續森林，但蟬出現的模式和組成卻與栽植林的狀況較相似，薄翅蟬的豐度明顯高於其他蟬種。 在三種森林環境中，影響蟬種數及豐度的植被因子不同，只有樹冠層覆蓋度是影響三類森林蟬種數的共同因子。 栽植林中，樹種多樣性雖然最高，但蟬的多樣性卻最低。 因此相較於樹種組成，植被結構對於蟬種數和豐度的影響較大。
第二部份是針對蟬所利用資源，包括時間、空間（棲地和羽化高度）、和食物，探討各蟬種對於資源利用的分隔現象。 各蟬種在5 ~ 8月份大量出現，正好和當地的雨季重疊，且有4種蟬的數量和雨量成正相關。 此外，不同種蟬達到數量高峰的時間並無明顯分隔。 三類棲地出現的蟬種幾乎相同，只有小蟪蛄在連續森林中沒有採樣紀錄。 薄翅蟬數量最多，出現的頻度和豐度、及利用樹種寬度和豐度均最高。 不過在連續森林中，薄翅蟬出現的相對頻度和豐度遠低於其他兩類森林，且以恆春羽衣蟬利用最多的植物種數和數量。 蟬在栽植林利用的樹種較廣，但偏好利用樹種的比例較低；在連續森林中，蟬利用的樹種雖較少，但有偏好利用樹種的比例較高。 各種蟬的羽化高度有顯著差異，但和體型大小無關。 以數量最多的薄翅蟬探討影響羽化高度的原因，得知其羽化高度隨時間（距離第一次發現蟬蛻的天數）有顯著差異，但在三類森林環境並無不同。 在栽植林中，不同種蟬的數量正向影響薄翅蟬的羽化高度，而樹的胸高徑越大，其羽化高度越低，不過蟬蛻種數和同種蟬的數量並非影響因子。在破碎森林和連續森林中，可能因為薄翅蟬數量較少，其羽化高度並不受到以上因子的影響。 共域的蟬使用資源的分隔情形，多呈現在棲地、羽化高度、利用樹的寬度、和偏好利用樹種的比例，在時間上的分隔較不明顯。

Cicadas (Hemiptera: Cicadidae) are phytophagous insects, and belong to the same guild. This investigation put emphasis on the community composition of cicada assemblages in the Kenting, Taiwan. I set seventy quadrats (10m × 10m in size) in the Guijijaou Experimental Forest, and differentiate three forest settings according to the forest continuity and man-made interference degree, including continuous forest, fragmented forest-forest edge, and plantation. Exuviaes collecting carried out in each quadrat once every 1 ~ 2 week since April 2005. The emergence of cicada species and abundance were based on the data of exuviaes collecting. The tree species with exuviaes on it indicated that species maybe used by the nymphs in the soil. In quadrats, there were seven species of exuviaes, including Chremistica ochracea, Cryptotympana takasagona, Euterpnosia koshunensis, Nipponosemia virescens, Purana apicalis, Pomponia linearis, and Platypleura takasagona. The average of species richness and abundance of cicadas in each quadrat were highest in the plantation; however, the diversity index and evenness were highest in the continuous forest. The cicada richness and abundance were mainly affected by different vegetable variable in different forest setting, and just the canopy cover was the common factor influencing cicada richness of three forests. In the plantation, the tree diversity was the highest, but the cicada diversity was the lowest. The vegetation structure affected cicadas’ richness and abundance more than the species composition of trees. Although the tree species composition in the fragmented forest was similar to the continuous forest, the pattern of cicada emergence and composition were closed to the plantation. The abundance of C. ochracea was significantly higher than other species of cicadas in the plantation and fragmented forest.
In the other section, I aimed to discuss the of resource utilization pattern of cicada assemblage in temporal, spatial, and food aspects. Most cicadas emergenced between May to August, overlapped with the rain season in the study area, and the peak numbers of each cicada species didn’t partition obviously. P. takasagona was not recorded in the continuous forest, and the other six species appeared in three forest settings. Each cicada species was differed with the pattern of emergence, the utilized tree spescies and abundance, the relative frequency of occurrence, and the relative abundance in three habitat types. C. ochracea, the most abundant species, occurred frequently and used the most trees. The relative frequency of occurrence and the relative abundance of C. ochracea in the continuous fores were lower than that of the other two forests, and N. virescens used more tree species and abundant. In the plantation, cicadas utilized the great breadth of tree species and preferred lowest proportion of tree species. However, they went the opposed way in the continuous forest. The eclosing height of each cicada species differed significantly with each other, but it was not correlated to body size. I chose the most abundant C. ochracea to analyze the factors affecting eclosing heights. The eclosing height of C. ochracea differed significantly with time (the days since the first day discovering exuviaes), but not with habitat types. In the plantation, the number of different cicada species positively affected eclosing height, but the diameter at breast height (DBH) influenced negatively. The number of C. ochracea and the species richness of exuviaes were not the factors. But in the fragmented and continuous forests, the eclosing height of C. ochracea was not affected by above factors due to less abundant of C. ochracea. Resource partitioning of sympatric cicadas displayed mainly in habitats, eclosing heights, breadth of utilized trees, and proportion of preferred trees, relative to temporal partitioning.

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