• Journal of the korean veterinary medical association
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• v.51 no.2
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• pp.102-102
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• 2015

• 한국전자현미경학회:학술대회논문집
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• 2004.05a
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• pp.36-36
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• 2004

• Animal Systematics, Evolution and Diversity
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• v.6 no.2
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• pp.165-172
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• 1990

The patterns of serum proteins in seven species of Korean rodents were analyzed by immunoprecipitin, immunodiffusion, and immunoelectrophoresis. It is found that the serum proteins of each species were different with one another and thatntigenic divergence among the seven species seems to be enormous , ie., serological correspondence ranged from 99.6 in Rattus norvegicus caraco(suborder Myomorpha) to 2.7 in Tamias sibircus asiaticus (suborder sciuromorpha). In the six species of the family Muridae (Suborder Myomorpha), the lowest value of 8.2 was shown in Clethrionmys rufocanus regulus (Subfamily Microtinae).

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2017.10a
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• pp.188-188
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• 2017

• Applied Microscopy
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• v.34 no.3
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• pp.159-170
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• 2004

Spermiogenesis in the Korean squirrel, Tamias sibiricus, was investigated by transmission electron microscopy. Spermiogenesis was divided into Golgi, cap, acrosome, maturation and spermiation phases based on the characteristics of acrosomal changes and nuclear shape. Beside, the Golgi, cap and acrosomal steps were subdivided into three phases of early, middle and late phase respectively, the maturation step was divided into two phases of early and late phase, and spermiation step has only one phase. Thus, the spermiognesis of T. sibiricus was divided into a total of twelve phases. In Golgi phase (steps 1-3), a well developed Golgi complex was located close to the vesicles, the acrosomal vesicle fixd to a recess of nuclear membrane at step 3. During cap phase (steps 4-6), the acrosomal vesicle spred over the nuclear surface to cover a third of the nucleus, and the acrosomal granule was not yet flattened. At acrosomal phase (steps 7-9), the nucleus and acrosome were elongated but nucleoplasm was not condensed. During maturation phase (steps 10-11), the nucleoplasm was more condensed, and the mitochondria completely arranged the center of axoneme. The spatulate-sperm head was completely formed at spermiation phase (step 12).

• Journal of Environmental Impact Assessment
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• v.24 no.3
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• pp.233-243
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• 2015

The ecosystem fragmentation due to transportation infrastructure causes road-kill phenomenon. When making policy for reducing road-kill it is important to select target-species in order to enhance its efficiency. However, many corridors installed in Korea have been raised issues about their effectiveness due to lack of considerations such as target-species selection, site selection, and management, etc. In this study, we are to grasp relationship between road-kill area and habitat patches and suggest that spatial location of habitat patches should be considered as one of the important factors when making policy for reducing road-kill. Habitat patches were presumed from overlying suitability index that chosen by literature review and road-kill hotspot was determined by Getis-Ord $G_i^*$ analysis. Afterwards, we performed a correlation analysis between $G_i$ Z-score and the distance from habitat patches to the roads. As a result, there is a negative correlation between two variables, It affects the $G_i^*$ Z-score going up if the habitat patches and the roads become closer.

• Journal of the Korean earth science society
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• v.35 no.4
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• pp.290-294
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• 2014

In this study, we investigated the characteristics of rodent (mainly ground squirrel) burrows found near the Lake Hovsgol, Mongolia. Those burrows are straight to slightly curved and gently inclined in lateral view. Cross-sectional shapes are either circular or elliptical with diameters ranging from mostly 8-10 cm. Most abandoned burrows are passively filled with soils and/or pebbles. The size and architecture of these Mongolian burrows are remarkably similar to those of the previously reported Late Pleistocene burrows from Korea. Therefore, the rodent burrows found at Korean Palaeolithic sites are thought to have been formed by ground squirrels. However, the difference in burrow-fills suggests that the mean annual precipitation of the Korean Peninsula during the Late Pleistocene is much higher than that of Mongolia.

• The Korean Journal of Zoology
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• v.31 no.4
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• pp.251-264
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• 1988

동면 상태에서 혈액성분의 생화학적 변화치를 조사하고자 전남 각지에 서식 또는 광주직할시 근교에서 양식하고 있는 뱀장어, 개구리, 살모사 그리고 다람쥐를 활동기(7월∼8월), 잠입기(10월∼11월), 동진기(12월∼1월) 및 각려기(3월∼4월)에 채집하였다. 이들 동물들의 혈청에서 Total protein, Albumin, Globulin, A/G ratio, Glucose, Calcium, Urea함유량을 조사하여 얻은 성적을 비교 검토하여 다음과 같은 결론을 얻었다. 1 . Total protein의 변화는 각 동물사이에서 상당한 차이를 보이되 잠입기에 다소 증가하였다. 특히 다람쥐에서 Total protein 함유량이 다른 동물들 보다 많았다. Albumin함유량은 잠입기에 상승하였고 동면기에는 약간의 감소를 보이다가 각성기에는 현저한 감소를 보였다. gloulin함유량은 잠입기에 상당히 상승하고 동면기에 약간의 감소를 나타내었으며 각성기 인 봄철에는 많은 증가 현상을 보였다. 2. 혈청 Urea의 함유량은 동면의 각과정에 따라 상당한 차이가 있었다. 즉 잠입기에 약간 상승하고 동면기에는 저하를 보였으며 각성기에는 전 실험동물에서 검출되지 않았다. 3. 혈당의 변화는 잠입기에 대체로 저하하고 동면기에는 심한 저혈당 수준에 이르렀다. 각성기인 봄철에는 다람쥐를 제외하고는 동면기의 혈희량과 유사하였다. 4. 혈청 Calcium함유량의 변화는 활동기에 비하여 잠입기에는 상당한 증가현상을 보였으나동면기에는 전 실험동물이 거의 같은 수준으로 감소를 보이며 각성기에 까지 감소하였다. In order to the biochemical change of the serological components of hibernating animals, eels(hnguillo joponica Temminck et Schlegel), frogs (Rana nigromacurata Hallowell), snakes (Agkistro-don holds breuicaudus Stejneserl, squirrels (Tamias striatus Linnaeus) which were collected around Gwangiu city and the Chunnam area were observed in accordance with the phases of hibernation. The author described the hibernating cycle as active (June-July), prehibematins(October-Novemberl, hibernating (December-January) and posthibemating phase (March-Aprill. The values of total protein, albumin, globulin, hJG ratlo, calcium, glucose and urea were chiefly investigated in their serum. The results are as following: Total protein was shown to be consider-able in eels, frogs, snakes, squirrels and increased in prehibemation. Especially, the mean value was high in sqirrels. Albumin values was increased during prehibemation. But a little decrease was shown during hibernating and an outstanding decrease during posthibemation. The globulin value increased considerably during prehlbemation but decreased a little during hibernation phase. Changes of urea were shown to be considerable according to the stage of each hibem3-tion. A little increase was shown during prehibemation and decrease during hibernating stage. but urea was not found in posthibemation in any experimental animals. The glucose value was generally decreased during prehibematlon. An extremely little increase in glucose was shown during hibernation (hypoglycemia). All hibernating values except those for squirrels in spring posthibemating phase were at almost the same level. The calcium value was shown to be considerable during prehibemation in comparison with active phase. The same level of decrease was represented in all kinds of animals and continued at the stage of posthibemation.

• Applied Microscopy
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• v.41 no.2
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• pp.99-107
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• 2011

Light microscope, and scanning and transmission electron microscopy were used to investigate the fine structure of sperm of the Korea squirrel, Tamias sibiricus. The sperm head of T. sibiricus was paddle in shape. The total length of T. sibiricus sperm was 67.8 ${\mu}m$. The length of sperm head was 7.8 ${\mu}m$, and the tail (60.0 ${\mu}m$) was consisted of four major segments: the neck (1.0 ${\mu}m$), middle (8.0 ${\mu}m$), principal (48.5 ${\mu}m$) and end piece (2.5 ${\mu}m$), respectively. Especially, the length of the middle piece is short, and end piece was very shorter than those of other rodents. The post-nuclear cap was occupied about a fifth of nucleus. The equatorial segment is located between the post-nuclear cap segment and acrosomal cap on the nuclear surface. Nine segmented columns were surrounded by the mitochondria, and numbers of gyres of mitochondria were 26. One segmented column was consisted ten to twelve knobs, and each of segmented column in the neck region connected with the nine outer dense fiber in the middle piece. Numerous satellite-like fibers were scattered around the segmented columns. Nos. 1, 5 and 6 of the outer dense fibers in the middle piece were larger than the others. A fibrous sheath and longitudinal column of the principal piece were in evidence, but the fibrous sheath and longitudinal column was not seen at the end piece. In conclusion, the structural features of sperm head and tail may be useful information to patterns of sperm evolution and classification of species.

• Korean Journal of Environment and Ecology
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• v.27 no.1
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• pp.64-70
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• 2013

To examine the proportion of secondary seed dispersion by wildlife and to identify the related wildlife, We measured seed removal rates and related wildlife at the natural mixed broadleaved forest in mountain Jungwang, Pyeungchang-gun in middle part of Korean peninsula, seed-tray contained four kind of tree seeds were setted from mid-september to late-October for three years. Mean seed removal rates(MSRR) of acorn(Q. mongolica)is shown the highest values 87.2%, next MSRR of samara(A. pseudosieboldianum) does 33.1%, MSRR of samara(A. pictum subsp. mono) does 29.2%. and then SRR of samara(A. mandshuricum) does only 13.6%. Acorns are removed more faster than samaras. Among the related wildlife, Siberian chipmunks most freqently visit seed tray, and ordered Korean squirrel, Wild boar, and Yellow-throated marten. Most secondary dispersed acorns might be consumed by Wild boar, and small portions does comsumed or scatter-hoarded by rodents. Most secondary dispersed samaras might be consumed by rodents, and small portions does scatter-hoarded by rodents. A few sound seeds are remained on the forest floor in late October owing to the seed consunption and seed hoarding by wildlife. We observe seedling establishment of four broadleaved tree species. From these results, We proved Wild boar is seed comsummer, and rodents are seed consummer and seed disperser. Further studies on secondary seed dispersion, seed consumption and hoarding and related wildlife should be needed.