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µ¿ÇØ ¿ï¸ªºÐÁö ÅðÀû¹° ³» À¯±â¹° ºÐÇØ°æ·Î: ¸Á°£È¯¿øÀÇ Á߿伺 (Organic carbon oxidation dominated by Mn reduction in the deep Ulleung Basin, East Sea)
- ¼öÃþÀÇ ³ôÀº »ý»ê·Â°ú ºü¸¥ ħ°À¸·Î ÀÎÇØ, µ¿ÇØ ¿ï¸ªºÐÁöÀÇ Ç¥ÃþÅðÀû¹°¿¡´Â ´Ù·®ÀÇ À¯±â¹°ÀÌ ÇÔÀ¯(>2.5%, dry wt.) µÇ¾î ÀÖÀ¸¸ç, ºÐÁö Áß¾ÓºÎ(¼ö½É 2000 m ÀÌ»ó)ÀÇ Ç¥Ãþ ÅðÀû¹° ³»¿¡´Â »êÈµÈ ¸Á°£°ú öÀÌ ´Ù·® ÇÔÀ¯µÇ¾î ÀÖ´Ù. ƯÈ÷, ¿ï¸ªºÐÁöÀÇ ³ôÀº »êȸÁ°£ ³óµµ(150-200 ¥ìmol cm-3)´Â Àü¼¼°èÀûÀ¸·Îµµ 3°÷(Panama basin, Black Sea, Skagerrak)¿¡¼¸¸ º¸°í µÈ ƯÀÌÇÑ Áö¿ªÀÌ´Ù.
- ÅðÀû¹° ³»¿¡¼ ¿ëÁ¸ ÇüÅÂÀÇ ¸Á°£Àº ºÐÀÚÈ®»ê°ú »ý¹°°ü°³À» ÅëÇØ, ÀÔÀÚ¼º ¸Á°£Àº »ý¹°±³¶õ°ú ÀÌ·ù °úÁ¤À» ÅëÇØ À̵¿µÉ ¼ö ÀÖ´Ù. ´ë·ú»ç¸é ºÎ±ÙÀÇ ÅðÀû¹° ³»¿¡¼ ÅðÀû¹°/¼öÃþ °æ°è¸éÀ¸·Î À̵¿µÈ ¸Á°£Àº ÀúÃþ¼ö·Î ºüÁ® ³ª¿Í ´À¸®°Ô »êÈµÇ¸é¼ ºÐÁö ÂÊÀ¸·Î À̵¿µÉ ¼ö ÀÖÀ¸¸ç, ºÐÁö ÅðÀû¹° ³» ¸Á°£Àº ÀúÃþ¼ö·Î À̵¿µÇ¾î »êÈµÈ ÈÄ ´Ù½Ã ÀçÅðÀû µÉ ¼ö ÀÖ´Ù. ƯÈ÷ ºÐÁö ³» ¸Á°£ ¼øȯ °úÁ¤¿¡¼ »ý¹°±³¶õ(Fig. 1 ¼Ó ¿ÞÂÊ»çÁø)ÀÇ ¿µÇâÀ¸·Î ¸Á°£ÀÇ À̵¿°ú ÀçÅðÀûÀÌ ºü¸£°Ô ÃËÁøµÉ ¼ö ÀÖÀ» °ÍÀ¸·Î ÀÌÇصǰí ÀÖ´Ù(Fig. 1).
Fig. 2. Sequential distribution of major electron acceptors in the sediments of Ulleung Basin (adopted from Hyun et al. 2017)
- Fig. 2ÀÇ °æ¿ì, ºÐÁö Á¤Á¡(D3)¿¡¼ »ê¼Ò, Áú»ê¿°, »êȸÁ°£, »êÈö°ú °°Àº ÀüÀÚ¼ö¿ëüµéÀÌ À¯±â¹° ºÐÇØ °úÁ¤¿¡¼ÀÇ ¿¡³ÊÁö »êÃâ ¼ø¼¿¡ µû¶ó ¶Ñ·ÇÇÑ ¼öÁ÷ ºÐÆ÷¸¦ º¸ÀÌ°í ÀÖ´Ù. Ç¥Ãþ 8 cm ³»¿¡ »êȸÁ°£°ú »êÈöÀÇ ³óµµ°¡ ³ô°í, ¸Á°£/ö ȯ¿øÀÌ ¿ì¼¼ÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
- µ¿ÇØ ¿ï¸ªºÐÁö Áö¿ªÀº µ¿¼ö½É´ë(1000-2500 m) Áö¿ªµé Áß À¯±â¹° ºÐÇØÀ²ÀÌ °¡Àå ³ô°í, ¿µ¾ç¿° Àç¼øȯÀÌ ºü¸£°Ô ÁøÇàµÇ´Â »ýÁöÈÇÐÀû ÇÖ½ºÆÌ(biogeochemical hotspot)À¸·Î Àνĵǰí ÀÖ´Ù.
- ÅðÀû¹° ³»¿¡¼ À¯±â¹° ºÐÇØ°æ·Î´Â ¼öÃþÀ¸·ÎºÎÅÍÀÇ À¯±â¹° °ø±Þ ¹× ÅðÀû¹° ³»¿¡¼ ÀÌ¿ë °¡´ÉÇÑ ÀüÀÚ¼ö¿ëü(»ê¼Ò, Áú»ê¿°, »êȸÁ°£, »êÈö, Ȳ»ê¿°) ºÐÆ÷¿¡ ÀÇÇØ °áÁ¤µÈ´Ù. Áö³ 30³â°£ µ¿ÇØ¿¡¼´Â ÀúÃþ¼ö ³» ¿ëÁ¸»ê¼Ò ³óµµ °¨¼Ò¿Í ¼ö¿Â Áõ°¡(°¢°¢ 10 % °¨¼Ò, 0.04 C Áõ°¡)°¡ °üÃøµÇ¾ú´Ù. ÀÌ·¯ÇÑ °á°úµéÀº, ÇâÈÄ ¿ï¸ªºÐÁö ÅðÀû¹° ³» À¯±â¹° ºÐÇØ ¹× ºÐÇØ°æ·ÎÀÇ º¯È°¡ ÀϾ ¼ö ÀÖÀ½À» ½Ã»çÇÑ´Ù.
- µû¶ó¼ ¿ï¸ªºÐÁö¿¡¼ À¯±â¹° ºÐÇØ ¹× ºÐÇØ°æ·Î º¯È¿¡ ´ëÇÑ Àå±â¸ð´ÏÅ͸µÀº µ¿ÇØ¿¡¼ Àå±âÀû ±âÈĺ¯È¿Í °ü·ÃµÈ »ýÁöÈÇÐÀû ¹°Áú ¼øȯÀÇ º¯È¸¦ ÀÌÇØÇÏ°í ¿¹ÃøÇϱâ À§ÇØ Áß¿äÇÏ´Ù. º» ¿¬±¸½Ç¿¡¼´Â ½ÉÇØ ÅðÀû¹° ³» ¹Ì»ý¹°¿¡ ÀÇÇÑ »ýÁöÈÇÐÀû °úÁ¤À» ÆľÇÇÏ¿© Çؾçȯ°æ ³» ´Ù¾çÇÑ ¿ø¼Òµé(C, N, P, S, Fe, Mn µî)ÀÇ ¼øȯÀ» ÀÌÇØÇÏ´Â ¿¬±¸¸¦ ÁøÇàÇÏ°í ÀÖ´Ù.
[¹®ÀÇ:¸ñÁø¼÷(bokbok@hanyang.ac.kr)]
Fig. 3. Changes in concentrations of DIC, acetate, Mn2+ and Fe2+ during anoxic incubation of sediment slurries at the center of the UB
- ´õºÒ¾î, Çؾç ȯ°æ ³» ź¼Ò ¹× °¢Á¾ ¿ø¼Ò ¼øȯÀ» Á¶ÀýÇÏ´Â ÇÙ½ÉÀûÀÎ ¿ªÇÒÀ» ¼öÇàÇÏ´Â ¹Ì»ý¹° ±ºÁý±¸Á¶ ¹× ´Ù¾ç¼ºÀ» ÀÌÇØÇÏ´Â ¿¬±¸´Â ÁöÈÇÐÀû Çؼ®°ú ÇÔ²² ¹Ýµå½Ã ¼öÇàµÇ¾î¾ß ÇÒ ¿¬±¸ ºÐ¾ßÀÌ´Ù [¹®ÀÇ:Á¶Çý¿¬ (youn798@hanmail.net)].
- ¸Á°£ »êȹ°ÀÌ Ç³ºÎÇÑ ¿ï¸ªºÐÁö Á߽ɺο¡¼ ÃÖÁ¾ À¯±â¹° ºÐÇØ°úÁ¤(terminal organic carbon oxidation process)À» ÀÌÇØÇÏ°í, ÀÌ¿¡ °ü¿©ÇÏ´Â ¹Ì»ý¹° ±ºÁýÀ» °ËÃâÇØ ³»°íÀÚ ºÐÁö ÅðÀû¹° ³» ¾Æ¼¼Å×ÀÌÆ®¸¦ ÷°¡ÇÏ¿© ÀÏÁ¤ ±â°£ µ¿¾È Çø±â¼º Á¶°Ç¿¡¼ ¹è¾çÇÏ¿´´Ù. ¾Æ¼¼Å×ÀÌÆ® ÷°¡¿¡ µû¶ó ¹Ì»ý¹° È£ÈíÀÌ Àڱصʰú µ¿½Ã¿¡ Mn2+ ÀÌ¿ÂÀÇ ³óµµ°¡ Áõ°¡ÇÏ¿´´Ù. ÀÌ´Â, ºÐÁö ÅðÀû¹° ³» Çø±â¼º ¾Æ¼¼Å×ÀÌÆ® ºÐÇØ´Â ¸Á°£È¯¿ø°ú ¦À» ÀÌ·ç¾î ÀϾ°í ÀÖÀ½À» ÀǹÌÇÑ´Ù (Fig. 3).
- ¾ÈÁ¤µ¿À§¿ø¼Ò·Î Ç¥ÁöµÈ ¾Æ¼¼Å×ÀÌÆ®(13C-acetate)¸¦ ÷°¡ÇÑ ½ÇÇ豸ÀÇ ÅðÀû¹° ½½·¯¸®¿¡¼ RNA¸¦ ÃßÃâÇÑ ÈÄ ÃÊ°í¼Ó ¿ø½ÉºÐ¸®(Ultracentrifugation)¸¦ ÅëÇØ ¾Æ¼¼Å×ÀÌÆ®¸¦ Á÷Á¢ ºÐÇØÇÏ¿© 13C°¡ RNA¿¡ Ç¥ÁöµÈ ¹Ì»ý¹° ±×·ìÀ» °ËÃâÇس»¾ú´Ù.
- µ¿ÇØ ¸Á°£ »êȹ°ÀÌ Ç³ºÎÇÑ ºÐÁö Á߽ɺο¡¼ Gammaproteobacteria¿¡ ¼ÓÇÏ´Â Colwellia ¿Í Oceanosprillales ±×¸®°í, Deltaproteobacteria¿¡ ¼ÓÇÏ´Â Desulfuromonadales ±×·ìÀÌ ÁÖ¿ä ¾Æ¼¼Å×ÀÌÆ® ºÐÇØ-¸Á°£È¯¿ø ¹Ì»ý¹°·Î °ËÃâµÇ¾ú´Ù.
- ÇÑÆí, autotrophic ammonia oxidizer·Î½á ¾Ë·ÁÁø Thaumarchaeotaµµ ¾Æ¼¼Å×ÀÌÆ®·ÎºÎÅÍ À¯·¡µÈ ź¼Ò¸¦ ü³» ÇÕ¼ºÇÑ °ÍÀ¸·Î ³ªÅ¸³ª, Çؾç ÅðÀû ȯ°æ¿¡¼ ź¼Ò ¼øȯ¿¡ ÀÖ¾îThaumarchaeotaÀÇ »õ·Î¿î »ýÅÂÀû ¿ªÇÒ¿¡ ´ëÇÑ Á¤º¸¸¦ Á¦°øÇÏ¿´´Ù [¹®ÀÇ:Á¶Çý¿¬(youn798@hanmail.net)]
Table 1. Phylogenetic affiliation of reversely transcribed 16S rRNA in the center of the UB
Phylogenetic affiliation |
Center of the Ulleung Basin |
0 day |
Heavy fraction |
No. of clones (%) |
No. of clones (%) |
Bacteria |
Actinobacteria |
1 (1.3) |
0 (0.0 ) |
Acidobacteria |
5 (6.3) |
0 (0.0 ) |
Bacteriodetes |
2 (2.5) |
0 (0.0 ) |
Chloroflexi |
2 (2.5) |
0 (0.0 ) |
Nitrospira |
2 (2.5) |
0 (0.0 ) |
Alphaproteobacteria |
9 (11.3) |
|
Deltaproteobacteria |
9 (11.3) |
4 (8.2) |
Gammaproteobacteria |
30 (37.5) |
39 (79.6) |
Fusobacteria |
0 (0.0) |
1 (2.0) |
Planctomycetes |
5 (6.3) |
3 (6.1) |
Unclassified |
15 (18.8) |
2 (4.1) |
Archaea |
Thaumarchaeota |
42 (82.4) |
18 (58.1) |
C3 |
1 (2.0) |
2 (6.5) |
MBGB |
1 (2.0) |
2 (6.5) |
MBGD |
5 (9.8) |
5 (16.1) |
Unclassified |
2 (3.9) |
3 (9.7) |