Population Dynamics Model of Japanese Brown Frog <i>Rana japonica</i> Crossing Agricultural Concrete Canals
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- WATABE Keiji
- National Institute for Rural Engineering
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- SENGA Yutaro
- Tokyo University of Agriculture and Technology
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- MORI Atsushi
- National Institute for Rural Engineering
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- KOIZUMI Noriyuki
- National Institute for Rural Engineering
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- TAKEMURA Takeshi
- National Institute for Rural Engineering
Bibliographic Information
- Other Title
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- コンクリート水路を横断するニホンアカガエルを対象とした個体群動態予測のための数理モデル構築
Abstract
The countermeasures that enable frogs to cross agricultural canals have been developing because frogs often drown in agricultural canals with vertical concrete walls in Japan. The objective of this study was to develop a method for evaluating the population viability of the Japanese Brown Frog Rana japonica after countermeasures are installed. Two types of simulation models were examined; a ‘basic model’ based on the age-structured model and a ‘crossing model’ to consider the proportion of frogs crossing canals.<br>Parameter values such as survival rate and fecundity were estimated from observation data of age-dependent population fluctuations. Comparison of a basic model simulation with the observation data suggests model validation. The crossing model simulation with an initial population of 1,000 showed that a crossing proportion of 100% would achieve a 95% population viability after 40 years, suggesting frog migration should be ensured in this case.
Journal
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- Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering
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Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 80 (2), 207-213, 2012
The Japanese Society of Irrigation, Drainage and Rural Engineering
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Keywords
Details 詳細情報について
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- CRID
- 1390282680264129920
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- NII Article ID
- 130004555195
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- ISSN
- 18847242
- 18822789
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed