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Gamasid mite assemblage on mountain fire sites
Chuleui Jung,Tomasz Marquardt,Slawomir Kaczmarek,Hoonbok Yi 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Gamasid mites are free living predators of soil mites, collembolans, nematodes and other small insects in soil surface. We studied the faunal assemblages of gamasid mites in the severely disturbed mountain sites by fire. Total 12 families 55 species were found from this study. From all sites, species in the family of Parholaspidae were dominant; Holaspina alstoni and H. dentatus. Also, Rhodacarus dentitulatus was also abundant regardless of fire disturbance. In control site, Asca aphidioides was also abundant but not in any of the fire disturbed sites. The abundance was highest in control site followed by IC2, IT3 and lower in IT2 and IT1. Species richness was in the same order of abundance ranging from 2.6 to 12.8 per site. In all sites, species diversities were relatively low ranging from 0.6 to 1.7, but it was higher in control site and lower in IT1. Further discussion will be made on the recovery process of soil inhabiting mites.
Status and trend of edible insect study and implementation: International perspectives
Chuleui Jung,Sampat Ghosh 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
Despite of having excellent nutritional potential and ecological benefits edible insect has received minimal attention in many part of industrialized civilization. Recently since FAO reported edible insects as one of the best sustainable solution for future food and feed security, global attention has been focussed on the use of insects for food stuffs. In Korea, this phenomenon is accelerating with the help of registration of an Act known as insect industry law which came into effect in 2010. We presented status and trend of research on edible insect and implementation from the global perspectives. Edible insect studies are categorized as 1) status of edible insect resources and distribution, 2) anthropological aspects, 3) biodiversity conservation aspects, 4) edible insect development for diet supplement or food ingredients including some legal aspects, and 5) efforts to bring insects on the table. Lastly some examples of large scale implementation for the production and manufacture systems were presented.
Simple model can help understand the complex interaction
Chuleui Jung 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
Modeling is one approach to better understanding the complex interaction in the abstracted and simplified forms. Here I present the interaction of honeybee, Apis mellifera and ectoparasitic mites of Varroa destructor and Tropilaelaps mercedesae. In the beginning, I provide the basic mechanism of ectoparasitic mite’s life cycle in association with the host insect life. Population behavior was analyzed as a single analytical population growth model. Then, since the carrying capacity of mite’s breeding resources are changing, I incorporated the damage function of mite to honeybee population. Incorporating the damage function into the honeybee-varroa interaction model provided more realistic behavior of both species. Simulation study showed that possible beneficial impact of hive-splitting on mite control. Also, varying the chemical spray timing and efficacies, the model simulation revealed that early spring acaricide treatment was essential for protection of honeybee from the varroa mites. At the last, this model has been expanded to include the other parasitic mite of Tropilaelaps mercedesae. For this, two species competition model was considered as well as incorporation of the host population behavior being added. Further discussion and call for collaboration were presented.
Chuleui Jung 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
Biological invasion is becoming more important disturbance factor to the structure and function of ecosystem as well as to the bio-industry such as apiculture. Since the invasion of the yellow-legged hornet, Vespa velutina nigrithorax Buysson, 1905 into Busan port, the southeastern part of Korea in 2003, gradual spread of the hornet was observed. The rate of spread was estimated as 12.4 Km/yr, which was 5.6 times slower than that from France, 67.3 Km/yr. The diffusion coefficient (D) is still in increasing phase, implying the greater risk of spread. The Korean population was homologous to Zhejiang population of China implying the possible invasion source. It has a great potential to harm the Korean beekeeping industry and the ecosystem through the competition with the similar guild, the other 10 spcies of Vespa in Korea. Among those, smaller sized hornets such as Vespa analis or V. simillima simillam seemed under serious impact. Community structure of Vespa was different before and after the invasion. After V. velutina invasion, the survey on 2010 from Gyeongnam province showed 67% of V. velutina and reduced proportion of the smaller size hornets such as V. analis, V. crabro and V. simillima simillima compared to the bigger sized hornets such as V. mandarinia or V. ducalis. Also because of the nesting urban area, public education and involvement are requested for protection against the hornet’s aggresiveness and also for monitoring the distribution and population expansion. Further research and public network would mitigate the potential risks.
Soil Acarodiversity and Environmental Assessment
Chuleui Jung,Jiwon Kim,Eunsun Keum 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
Soil harbours great biodiversity and governs the ecosystem processes such as nutrient cycling and energy flow. Among groups of mesofauna, soil mites; oribatids, gamasids, prostigmatids, astigmatids are hyper-diverse and abundant in soil ecosystem. This renders the use of soil mite assemblage for biological indicator of the ecosystem health. Gamasida are the main predator among the soil mesofauna, playing a crucial role in maintaining the soil food web and contribute significant influence on material cycling and energy flow. Several concepts of environmental assessment using soil mites, specially Oribatid mite and Gamasid mites have been proposed, but not quite applied yet. Examples are the indexes of conventional community analysis, Aoki’s index of oribatid mites and maturity index of gamasid mites, We have collected soil mites from diverse ecosystems; natural forests, disturbed forests, perennial tree orchards, and annul farming fields. Using those data, here we present some of the results on environmental assessment of the habitats.
Distribution of Vespa velutina after invasion relative to climate change
Chuleui Jung,Seongbin Park,Jeongjun Park 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Vespa velutina is a predatory hornet distributing in SouthEastern part of Asia and became invasive in early 2000s; invading into Korea in 2003 and France in 2004. Its distribution pattern showed typical species-invasion curve type with slow progress in the beginning and rapid expansion on ward. We determined the geographic spread of V. velutina with CLIMEX modeling. The model analysis indicates that the ecoclimatic indices (EI) increased as the projection year increased based on RCP8.5 scenario. Then the predicted EI values were further regressed with the field collected data from 2018. Vespa velutina population sizes were estimated from 230 points of sampling over the country and the sampling data were correlated with predicted EI values. The results indicated that partial contribution of the climate factors for its abundance. Also this could be an usual biological indicator of climate change in agroecosystem in Korea. Given the important risk and impact on beekeeping, socio-biological as well as ecosystem and biodiversity levels, careful monitoring of phenology, range expansion and preventive efforts mitigating the impact are further required.