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임신재,송승훈,황현수 한국산림과학회 2014 Forest Science And Technology Vol.10 No.4
This study was conducted to clarify the characteristics of bat populations in lowland dry evergreen forests of the CentralCardamom Protected Forest in Cambodia during the rainy seasons of 2011–2013 and the dry seasons of 2012–2013. In fivestudy sites of the forest, data from 160 individuals of six bat species were recorded. The Sunda short-nosed fruit bat(Cynopterus brachyotis Sunda) was the most dominant species in all study sites. Most captured bats were adults, andcaptured females outnumbered captured males. In this study, populations of the bats, except for that of the Sunda shortnosedfruit bats, were not stable. Therefore, forest loss and degradation should be prohibited in the study areas to ensurestable bat populations. Further studies are required to investigate the ecological characteristics of fruit bats in various foresttypes for the conservation of the mammals and their habitats.
Differences in Artificial Nest Boxes Use of Tits Between Deciduous and Coniferous Forests
임신재,이주영 한국산림과학회 2005 한국산림과학회지 Vol.94 No.5
This study was conducted to describe the differences in artificial nest boxes use of tits between deciduous and coniferous forests at 2nd campus of Chung-Ang University (37o00'04''N, 127o13'96'' E), Ansung, Korea from January to August 2005. Tree species richness, tree species diversity index (H') and total basal areas were higher in deciduous forest than in coniferous forest. High, middle, low and understory canopy layers were more developed in deciduous forest, except the coverage of bush-ground layer. Varied tit Parus varius, marsh tit P. palustris and great tit P. major used the artificial nest boxes in this study. Number of breeding pairs of tits used artificial nest boxes, clutch size, and weight and size of eggs were higher in deciduous forest than in coniferous forest. The differences in habitat structure between study sites are very likely to have influenced how breeding birds used the available habitat. Artificial nest boxes could be used as management and conservation tool for birds, particularly in areas, where the availability of natural cavities and coverage of higher layer are limited.
Effects of Mixing on the Aggressive Behavior of Commercially Housed Pigs
임신재,손승훈,황현수,이재강,홍준기 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.7
In this study, we investigated the effects of mixing on the aggressive behavior of commercially housed pigs. The behavioral patterns of 36 groups of pigs (a total of 360 animals) were observed over 3 consecutive days directly after weaning (25±1.2 days of age), and 25 and 50 days later with the aid of video technology. Fight latency and total duration and frequency of fighting were significantly different among the age groups. The aggressive behaviors decreased in 75-day old pigs if compared to 25- and 50-day old animals. Moreover, dominance index (DI) was higher in 25-day old and lower in 75-day old pigs. A comparison of dominant (DI>0) and submissive (DI<0) pigs showed significant differences (p<0.05) for major aggressive behaviors in all age groups. Dominant pigs were involved in more aggressive interactions, had longer fights, and initiated more fights than submissive pigs. Post-mixing aggressive behavior was altered by previous experience of mixing. Aggressive behavior and DI are suitable methods for analyzing the effects of mixing on commercially housed growing pigs.
임신재,손승훈,김규정,황현수 한국산림과학회 2013 Forest Science And Technology Vol.9 No.3
This study was conducted to elucidate the breeding ecology of tits in artificial nest boxes in both deciduous and coniferous forests located in Mt. Namsan, Seoul Metropolitan, Korea, from March to June 2012. Great tit Parus major and varied tit P. varius both used the artificial nest boxes in the coniferous forest, but only the great tit used the artificial nest boxes in the deciduous forest for breeding. There were 27 artificial nest boxes in the coniferous forest and 17 in the deciduous forest. The rate of breeding success was 6.7–26.7% for both study sites. The clutch size of varied tits was less than that of great tits. Brood size, incubation period and nestling care period were the same for great and varied tits in the coniferous forest. There were no differences related to forest type for number of breeding pairs, breeding behaviors, egg measurements, and results of hatching, fledgling and breeding for great tits bred in artificial nest boxes. Long-term ecological research on food availability and breeding success of tits is needed for the conservation of these birds and their habitats.