Journal of Korean Nature最新文献

The study performed flora investigation for 3 times on seasonal basis between April and October 2012 in Seongeup Folk Village, Pyoseon-myeon, Jeju-si designated as No. 188 of the National Major Folk Cultural Asset to analyze distribution and features of alien plants and categorized naturalized plants to calculate the naturalized index and the urbanization index. The tracheophytes of the village is 201 taxa including 80 families, 175 genus, 183 species, 14 varieties, 2 plants and 2 subspecies and the alien plants account for 32.8% with 66 taxa including 37 families, 60 genus, 63 species, 2 varieties and 1 subspecies and the naturalized plants have a total of 27 taxa including 14 families, 24 genus, 26 species and 1 variety. The naturalized index of the 321 taxa of the naturalized plants was 13.4% and the urbanization index was 8.4%. Systematic plans to manage plants in the Seongeup Folk Village are required, as well as gradually eliminate alien and naturalized plants and replace them with indigenes.

As a result of conducting the study on the current state of bird diversity living in specific islands (Gokdudo, Daehangdo and Mokdo) twice for two days each on June and September, 2012, total 30 species, 184 birds were observed. As for each island, 8 species, 79 birds were observed in Is. Gokdudo, 17 species and 46 birds in Is. Daehangdo, and 20 species and 59 birds in Is. Mokdo. The most dominant species was Apuspacificus in the whole areas, total 58 birds (31.5%) were observed. In analysis of ecological index, species diversity was 2.62, species evenness was 0.77 and species richness was 5.56, and as for protected species, 3 species of natural monuments, two species of endangered wildlife class II and one kind of vulnerable species of the International Union for Conservation of Nature were recorded.

As a result of examining Vespidae in the Southeast areas of Yeongwol-gun, Gangwon-do, total 1,598 individuals from 2 subfamilies, 5 genera and 21 species were collected. This showed very high species diversity accounting for 70% of total species of domestic Vespidae. VI. koreensis koreensis was 379 (23.72%) ones, showing the highest rate, followed by Pa. indica (231, 14.46%), and V. simillima simillima (205, 12.83%). As for each genus, V. simillima simillima showed the highest rate, and V. ducalis and V. dybowskii showed relatively high rate as well. As for Dolichovespula, 2 species recorded domestically all appeared, and as for Vespula, 4 species were all collected except 2 species which had no distribution records recently or are potentially distributed species. There was no specific point in Parapolybia and Polistes. On one hand, as species belonging to Dolichovespula and Vespula which mainly inhabit in the northern regions appear, it is expected that their distribution will provide the basic materials useful for predicting climate change such as northing of insects in the north region according to the climate change in the future.

This study was conducted around Nakdonggang Estuary located in Busan. The study aimed to figure out current state by conducting long-period monitoring of common goldeneye (Bucephala clangula) around Nakdonggang Estuary where surrounding environment is rapidly changing. The data recorded in the early 1990s (May, 1989~April, 1993) and in the mid-2000s (May, 2002~April, 2008) were compared and analyed. A total of 1,563 common goldeneyes were observed around Nakdonggang Estuary during the study period (total 10 years). It was shown that there was no significant difference in the visitation aspect during the early 1990s and the mid-2000s in monthly analysis of the visitation aspect of goldeneye(P>0.05), but the number of common goldeneyes was higher in the mid-2000s (mean=241.67) than that in the early 1990s (mean=28.25). In the comparison of annual average number of common goldeneyes during the early 1990s and the mid-2000s (May~next April), it was shown that there was significant difference between December and January (P<0.05), and there was no significant difference during February~November. In the current state by each region, the average number of common goldeneyes was 48.33; 26.17 in Daema-deung (DMD), 1.50 in Jangja and Sinjaso (JJ and SJD), 82.33 in Saja and Doyo-deung (SJ, DYD), 62.00 in the south end of Ulsukdo (LUD) and 69.67 in Ulsukdo (USD). There was highly significant difference among regions (P<0.01). The common goldeneyes tend to use the upper and lower part of Noksan floodgate of Seonakdonggang (west branch of Nakdonggang) where the flow of water is smoothly, the river is wide and the water is relatively shallow due to extension construction of Noksan floodgate. In addition, as development in the west area of Busan due to construction of a new port and designation as the Free Economic Zone has harmful influences to the local ecosystem in Nakdonggang Estuary, it is under an urgent condition to prepare for the maintainance and preservation the ecosystem in this area.

The study performed collection surveys for 4 times from May to September, 2011 to investigate the insect fauna in Daebudo and Yeongheungdo Islands in the West Sea of Korea. The study confirmed the distribution of 1,153 insects with 9 orders, 96 families and 457 species.