Repository logo
  • English
  • 中文
Log In
Have you forgotten your password?
  1. Home
  2. College of Life Science / 生命科學院
  3. Ecology and Evolutionary Biology / 生態學與演化生物學研究所
  4. Divergent Life-History Strategies of Temporal Cohorts of Indian Rice Frogs (Fejervarya limnocharis) in the Two-Crops Rice Fields in Taiwan
 
  • Details

Divergent Life-History Strategies of Temporal Cohorts of Indian Rice Frogs (Fejervarya limnocharis) in the Two-Crops Rice Fields in Taiwan

Date Issued
2016
Date
2016
Author(s)
Kuan, Shu-Hui
DOI
10.6342/NTU201600570
URI
http://ntur.lib.ntu.edu.tw//handle/246246/272573
Abstract
Amphibian larvae have high plasticity in life history traits such as metamorphic age and size to cope with the varied aquatic environments. However, among the plentiful studies, few have investigated the effects of seasonal environmental changes. On the other hand, amphibian populations in diverse habitats or at different locations may face considerably distinct environmental variations. To better understand the life history responses of amphibian larvae to the spatial and temporal environmental variations, I used common garden experiments to investigate the metamorphic strategies of the rice paddy frog, <i>Fejervarya limnocharis</i>, tadpoles. I asked the following four questions: (1) Do <i>F. limnocharis</i> tadpoles living in two crops rice fields show cohort-dependent (spring vs. summer cohorts) metamorphic strategies in response to different temperature regimes in spring and summer? (2) How does food availability alter the responses of <i>F. limnocharis</i> spring and summer cohorts to seasonal temperature regimes? (3) Is cohort-dependent plasticity a common life-history strategy among different populations of <i>F. limnocharis</i> residing in two-crops rice fields? (4) Do <i>F. limnocharis</i> populations living in cultivated fields with different irrigation regimes exhibit differential cohort-dependent metamorphic strategies? I performed four experiments to tackle the four questions, respectively. In experiment 1, I collected spring (May) and summer (September) <i>F. limnocharis</i> tadpoles from Ankang rice fields. The tadpoles underwent a 2 x 2 temperature (22 vs. 29 ºC) by cohort (spring vs. summer cohort) factorial experiment. I found that both spring and summer tadpoles have higher growth rate when raised under their respective field temperatures. Moreover, spring and summer tadpoles used ''size advantage'' and ''rate advantage'' as cohort-dependent metamorphic strategies in response to seasonal temperatures, respectively. That is, spring tadpoles responded to low temperature with larger metamorphic weight, while the summer tadpoles did not. On the other hand, while both spring and summer tadpoles responded to high temperature with accelerating growth rates, summer tadpoles grew significantly faster than the spring ones. In the second experiment, I manipulated an additional factor: food availability (<i>ad libitum</i> vs. restricted) in a 2 x 2 x 2 temperature by food by cohort factorial experiment. The results were similar to those of experiment 1 when larvae were raised under <i>ad libitum</i> food. However, under restricted food, both spring and summer cohort reduced their metamorphic size. Spring tadpoles still had size advantage than summer ones at low temperature, whereas summer ones lost their ''rate advantage'' at high temperature and had slower growth rates than spring ones. In the third experiment, I collected tadpoles from rice fields at three locations: northern (Ankang and Daxi) and central (Changhua) Taiwan to examine their similarity in cohort-dependent plasticity. The tadpoles underwent a 2 x 2 x 2 temperature by cohort by location factorial experiment. The results showed that all three populations had cohort-dependent plasticity. Inter-population variations exist: the most northern population, Ankang, showed the clearest cohort-dependent plasticity likely due to being at a strongly seasonal temperatures and largely isolated location. The other northern population, Daxi, displayed a moderate, while the central population, Changhua, showed the least cohort-dependent plasticity probably due to the reduced seasonality in temperature toward the south. In the fourth experiment, I collected tadpoles from rice paddies and water bamboo fields that differ in irrigation regimes (disrupted vs. constant irrigation). The tadpoles underwent a temperature by cohort by irrigation system factorial experiment. The results showed that tadpoles from disrupted irrigation populations had cohort-dependent metamorphic strategies, while tadpoles from constant irrigation populations did not. Overall, the four experiments reveal that <i>F. limnocharis</i> tadpoles have high plasticity, specifically strong cohort-dependence, in metamorphic traits. Spring and summer tadpoles used ''size advantage'' and ''rate advantage'' strategies, respectively in response to seasonal temperatures. Such strategies vary depending on food availability, geographic location, and irrigation system.
Subjects
Cohort-dependent metamorphic strategies
Fejervarya limnocharis tadpoles
Food amount
Irrigation regimes
Plasticity
Temperature
Temporal divergences
Type
thesis
File(s)
Loading...
Thumbnail Image
Name

ntu-105-D94b44004-1.pdf

Size

23.32 KB

Format

Adobe PDF

Checksum

(MD5):622a195638a947ceec45539f83e159f8

臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of “NTU Repository” with “Academic Hub” to form NTU Scholars.

總館學科館員 (Main Library)
醫學圖書館學科館員 (Medical Library)
社會科學院辜振甫紀念圖書館學科館員 (Social Sciences Library)

開放取用是從使用者角度提升資訊取用性的社會運動,應用在學術研究上是透過將研究著作公開供使用者自由取閱,以促進學術傳播及因應期刊訂購費用逐年攀升。同時可加速研究發展、提升研究影響力,NTU Scholars即為本校的開放取用典藏(OA Archive)平台。(點選深入了解OA)

  • 請確認所上傳的全文是原創的內容,若該文件包含部分內容的版權非匯入者所有,或由第三方贊助與合作完成,請確認該版權所有者及第三方同意提供此授權。
    Please represent that the submission is your original work, and that you have the right to grant the rights to upload.
  • 若欲上傳已出版的全文電子檔,可使用Open policy finder網站查詢,以確認出版單位之版權政策。
    Please use Open policy finder to find a summary of permissions that are normally given as part of each publisher's copyright transfer agreement.
  • 網站簡介 (Quickstart Guide)
  • 使用手冊 (Instruction Manual)
  • 線上預約服務 (Booking Service)
  • 方案一:臺灣大學計算機中心帳號登入
    (With C&INC Email Account)
  • 方案二:ORCID帳號登入 (With ORCID)
  • 方案一:定期更新ORCID者,以ID匯入 (Search for identifier (ORCID))
  • 方案二:自行建檔 (Default mode Submission)
  • 方案三:學科館員協助匯入 (Email worklist to subject librarians)

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science