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Çѱ¹È¯°æ»ýÅÂÇÐȸ / v.23, no.6, 2009³â, pp.528-534
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( Breeding Site Characteristics of Styan's Grasshopper Warblers(Locustella pleskei) on Mara Islet, Jeju Province, Korea )
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±¹Á¦Àû ¸êÁ¾À§±âÁ¾À̸ç, µ¿¾Æ½Ã¾Æ¿¡ ±¹ÇÑÇÏ¿© ºÐÆ÷ÇÏ´Â ¼¶°³°³ºñ(Locustella pleskei)´Â Çѱ¹ÀÇ ÃßÀÚµµ, ¸¶¶óµµ, Ä¥¹ßµµ, È«µµ µî¿¡¼­ ¹ø½ÄÇÏ´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ¿ÔÀ¸³ª, ±¸Ã¼ÀûÀÎ ¹ø½Ä Á¤º¸´Â ¾ÆÁ÷ ¾Ë·ÁÁ® ÀÖÁö ¾Ê´Ù. º» ¿¬±¸´Â ¸¶¶óµµ(N $33^{circ}$ 06', E $126^{circ}$ 16')¿¡ ¹ø½ÄÇÏ´Â ¼¶°³°³ºñÀÇ ¹ø½Ä ÇöȲ°ú ¹ø½ÄÁö Ư¼ºÀ» ÆÄ¾ÇÇϱâ À§ÇÏ¿© ½Ç½ÃµÇ¾ú´Ù. 2008³â 5¿ùºÎÅÍ 9¿ù±îÁö ¼¶°³°³ºñ ÃÑ 11½ÖÀÌ ¹ø½ÄÇÏ´Â °ÍÀ» È®ÀÎÇÏ¿´°í, ¹ø½ÄÇÏ´Â µÕÁö´Â °õ¼Ö½£ÀÇ °ü¸ñÃþ¿¡ ÁÖ·Î ºÐÆ÷ÇÏ¿´´Ù. µÕÁö´Â °õ¼Ö½£ÀÇ °ü¸ñÃþ¿¡ ÁÖ·Î ºÐÆ÷ÇÏ¿´À¸¸ç, µ¿¹é³ª¹«(Camellia japonica)¿Í µ·³ª¹«(Pittosporum tobira) µî °ü¸ñ¼º ³ª¹«¸¦ µÕÁö¸ñÀ¸·Î ¼±È£ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. µÕÁö¸ñÀÇ ¼ö°í´Â $2.77{pm}1.10m$, Áö¸éÀ¸·ÎºÎÅÍ µÕÁöÀÇ ³ôÀÌ´Â $1.75{pm}0.56m$¿´À¸¸ç, µÕÁö¸ñÀÇ ¼ö°í´Â ´Ù¸¥ ÁÖº¯ÀÇ ³ª¹«º¸´Ù ³·Àº °ÍÀ¸·Î ³ªÅ¸³ª ¸¶¶óµµÀÇ °­ÇÑ ÇØÇ³À» ÇÇÇϴµ¥ À¯¸®ÇÑ °ÍÀ¸·Î ÆÇ´ÜµÇ¾ú´Ù. ÁÖ·Î ¾ï»õÀÙÀ̳ª »çÃʰú ½Ä¹°ÀÇ ÀÙÀ» ÀÌ¿ëÇÏ¿© ¹ä±×¸© ÇüÅÂÀÇ µÕÁö¸¦ ¸¸µé¾úÀ¸¸ç, µÕÁöÀÇ Áö¸§Àº $11.9{pm}0.5cm$, ³ôÀÌ´Â $11.1{pm}1.1cm$, ±íÀÌ´Â $5.8{pm}0.4cm$·Î ³ªÅ¸³µÀ¸¸ç, »êÁÂÁö¸§Àº 6.0cm¿´´Ù. ¸¶¶óµµ¿¡¼­ ¼¶°³°³ºñ´Â ´Ù¸¥ ¼¶Áö¿ªº¸´Ù ¹ø½Ä½Ã±â°¡ ´Ù¼Ò ´Ê¾úÀ¸¸ç, Çѹè»ê¶õ¼ö´Â 3°³·Î¼­ º¸Åë ´Ù¸¥ ¹ø½ÄÁöÀÇ 4-5°³º¸´Ù ÀÛ¾Ò´Ù. ÀÌ´Â ¹ø½Ä½Ã±â°¡ ´Ê¾îÁú¼ö·Ï Çѹè»ê¶õ¼ö°¡ Àû¾îÁö´Â ÀϹÝÀûÀÎ °æÇâÀ» µû¸£´Â °ÍÀ¸·Î º¸ÀδÙ. ÀÌ»óÀÇ °á°ú·Î º¼ ¶§, ¸¶¶óµµ °õ¼Ö½£ÀÇ ¼Ô¾Æº£±â¿Í °ü¸ñÃþ Á¦°Å´Â ¹ÐÁýµÈ °ü¸ñÃþÀ» µÕÁö·Î ¼±È£ÇÏ´Â ¼¶°³°³ºñÀÇ ¹ø½Ä¿¡ ¿µÇâÀ» ¹ÌÄ¥ ¼ö ÀÖ´Ù. µû¶ó¼­ ¼¶°³°³ºñ ¹ø½Ä »ýÅ ¹× ¼­½ÄÁö¿¡ Áö¼ÓÀûÀ̰í ü°èÀûÀÎ Á¶»ç°¡ ¿ä±¸µÇ¸ç, ½£°¡²Ù±â ¼öÇà¿¡ À־µµ ¼¶°³°³ºñÀÇ º¸ÀüÀ» À§ÇÑ ¼¼½ÉÇÑ ¹è·Á°¡ ÇÊ¿äÇÏ´Ù.
Styan's Grasshopper Warblers (Locustella pleskei) are vulnerable species distributed in East-Asia only. Its known breeding sites in Korea are remote islets including Hongdo Islet, Chilbal Islet, Mara Islet, and Chuja Islets, and, therefore, the breeding biology of this species is still poorly known. This study was conducted on Mara Islet (N $33^{circ}$ 06', E $126^{circ}$ 16') from May to September 2008 to investigate the breeding status and breeding site characteristics of the grasshopper warblers. A total of 11 breeding pairs and their nests were found on trees and shrubs at artificially planted forests and hedges of Pinus thunbergii. The grasshopper warblers preferentially utilized the shrub trees for nesting places, and major nesting trees were Camellia japonica, Pittosporum tobira and Pinus thunbergii as nesting trees. Average heights of nesting trees and nests were $2.77{pm}1.10m$ and $1.75{pm}0.56m$, respectively. The grasshopper warblers selected lower shrubs and trees for nesting than randomly selected ones around them, probably to avoid strong and prevailed winds in flat and un vegetated environments on Mara Islet. The shape of nests was a round bowl-type, and measurements of nests were $11.9{pm}0.5cm$ in exterior nest diameter, $11.1{pm}1.1cm$ in height of exterior nest, $5.8{pm}0.4cm$ in interior nest depth, and 6.0cm in interior nest diameter. It incubated eggs until the early August on Mara islet, and incubation periods of Mara Islet was possibly later than that of other areas. Furthermore, the clutch size in the study area was three, and they laid smaller number of eggs than normal clutch size (4~5 eggs) reported in other areas. Although we could not observe any nest predator on this species in the study area, selective cutting and pruning of trees will diminish dense shrub layer of forests. Therefore, it may affect the breeding of this threatened species which prefers dense shrubs of artificially planted forest of Pinus thunbergii. This study suggests that detailed and consistent further research on breeding biology and habitats of the grasshopper warblers are needed to conserve and manage of Pinus thunbergii forests on Mara Islet as an important breeding site of Styan's Grasshopper Warblers.
 
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Çѱ¹È¯°æ»ýÅÂÇÐȸÁö / v.23, no.6, 2009³â, pp.528-534
Çѱ¹È¯°æ»ýÅÂÇÐȸ
ISSN : 1229-3857
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200912368301435)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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