• Title/Summary/Keyword: population biology

Search Result 1,535, Processing Time 0.036 seconds

Population Viability Analysis of a Gold-spotted Pond Frog (Rana chosenica) Population: Implications for Effective Conservation and Re-introduction (금개구리 (Rana chosenica) 개체군의 생존분석: 개체군의 효과적인 보존과 야생복귀를 위한 제안)

  • Cheong, Seok-Wan;Sung, Ha-Cheol;Park, Dae-Sik;Park, Shi-Ryong
    • Korean Journal of Environmental Biology
    • /
    • v.27 no.1
    • /
    • pp.73-81
    • /
    • 2009

  • Population viability analysis of a Gold-spotted pond frog (Rana chosenica) population at Cheongwon-gun, Chungbuk, in South Korea was conducted and we proposed several suggestions for effective conservation and re-introduction of the species. Simulating a developed model over 1,000 times predicted that the population will exist over 30 years with a relatively low growth rate of 0.113, but with a high probability of extinction as 81.1%. Population growth and extinction probability were the most greatly depended on the rate of successful metamorphosis. In the case of outbreak of amphibian diseases such as Chytridiomycosis and Ranavirus, the population will be easily extinct within 4 years with 100% probability. In a habitat of which carrying capacity is 200, to successfully re-introduce an extinct population, it is initially needed to put 100 individuals of which 83% is males and its age structure is normal-distributed. If we additionally conducts artificial supplementation of 10% individuals every 2 years from 4 years to 10 years after initial reintroduction, the population will become a stable with 0.297 growth rate and 0.290 extinction rate. Our results are the first case of amphibian population viability analysis in Korea and could be used to develop effective conservation and re-introduction plans for endangered Gold-spotted pond frog.

  • PDF KSCI

Morphological Variability of the Japanese Swimming Charybdis japonica Populations (해양 갑각류 민꽃게(Charybdis japonica) 집단의 형태학적 변이성)

  • Heo, Youn-Seong;Lee, Bok-Kyu;Huh, Man-Kyu
    • Journal of Life Science
    • /
    • v.16 no.4
    • /
    • pp.672-675
    • /
    • 2006

  • In order to determine the morphological variations of the Japanese swimming crab, Charybdis japonica, we conducted morphological analysis of five populations that are relatively abundant in Korea and Japan. Abdominal sternite for individuals of the Tean population showed significantly short when compared to those of other populations. Principal component analysis demonstrated that morphological differentiation was due to differences (A/Q, B/M, D/P, F/O, J/K), and effectively discriminated each others. The first two components accounted for 40.9% and 60.7% of the variation, respectively. The dendrogram showed three distinct groups, Tokyo population, Taean population, and the other populations.

  • https://doi.org/10.5352/JLS.2006.16.4.672 인용 PDF KSCI

Comparison of Life Table and Feeding Behavior of Resistance and Susceptible Population of the Green Peach Aphid, Myzus persicae (Hemiptera: Aphididae) against Etofenprox (Etofenprox에 대한 복숭아혹진딧물(Myzus persicae)의 저항성과 감수성 개체군의 생명표와 섭식행동 비교)

  • Jo, Chang-Wook;Park, Cho-Rong;Yoon, Kyu-Sik;Kang, Min-A;Kwon, Hae-Ri;Kang, Eun-Jin;Seo, Mi-Ja;Yu, Yong-Man;Youn, Young-Nam
    • Korean journal of applied entomology
    • /
    • v.48 no.3
    • /
    • pp.301-310
    • /
    • 2009

  • For the comparing of mortality of the resistance and susceptible population of Myzus persicae, etofenprox was treated in the recommended concentration of 200ppm. Mortalities of resistance population were 16.7 and 36.7%, and susceptible population were 86.7 and 86.7% after 24 and 48 hours treatment, respectively. For the detect of cross resistance to other pyrethroids, 6 pyrethroids were examined. Mortalities of susceptible and resistance populations were 90 and 31% to deltamethrin, 92 and 23% to lambda cyhalothrin, 81 and 14% to cypermethrin, 70 and 20% to $\alpha$-cypermethrin, 29 and 28% to fenpropathrin, 84 and 29% to fenvalerate, respectively. It was showed that resistance populations were generally resistive to other pyrethroids. On the other hands, for recognized ecological characteristic of M. persicae susceptible and resistance populations life table was tested on the pepper leaves in the petri dish and on the plant in the pot. This results were showed that intrinsic rate of increase ($r_m$), net reproduction number ($R_0$) and generation time in day ($T_c$) were significantly different between two population in both tested. However, life span and reproduction period were slightly different between them. Otherwise, feeding behaviors were tested using EPG technique with non- and treated etofenprox. First potential drop time of susceptible and resistance population was 73.5 and 257.9 sec with non-treated and 93.3 and 1076.2 sec after treated, respectively. Electrical probing signals were 8.2 and 48.8 times with susceptible and resistance individuals after treated etofenprox, respectively. It was supposed that the resistance is more probings than susceptible population. After treated, total feeding time have more 6,728.9 sec on resistance than 965.5 sec on susceptible population. So, total non penetration time of susceptible population was 3,000 sec longer than resistance population.

  • https://doi.org/10.5656/KSAE.2009.48.3.301 인용 PDF KSCI