The coral δ15N record of terrestrial nitrate loading varies with river catchment land use

Atsuko Ishida, T. Watanabe, U. Tsunogai, H. Hasegawa, H. Yamano

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We analysed the nitrogen isotopes in two coral cores (δ15Ncoral) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δ15Ncoral reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δ15Ncoral for 14 years (CORE1; 1993–2007) and the annual variation of δ15Ncoral for 52 years (CORE2; 1958–2010). In CORE1, the 5-month running mean of δ15Ncoral was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d−1). In CORE2, the δ15Ncoral mean in the earlier period (1958–1980) was 1.0 ‰ greater than that in the later period (1981–2010). The annual averages of δ15Ncoral are positively correlated with the total precipitation in the rainy season (May–June) for both time periods. The difference in the δ15Ncoral between the earlier and later periods is probably caused by the land use changed from paddy fields with 15N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δ15N coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.

Original languageEnglish
Pages (from-to)353-362
Number of pages10
JournalCoral Reefs
Volume34
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

coral record
corals
coral
land use
nitrates
catchment
nitrate
rivers
river
sugar cane
nitrogen isotope
paddy field
paddies
annual variation
sugarcane
manure
mouth
isotopes
wet season
uncertainty

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

The coral δ15N record of terrestrial nitrate loading varies with river catchment land use. / Ishida, Atsuko; Watanabe, T.; Tsunogai, U.; Hasegawa, H.; Yamano, H.

In: Coral Reefs, Vol. 34, No. 1, 01.01.2015, p. 353-362.

Research output: Contribution to journalArticle

Ishida, Atsuko ; Watanabe, T. ; Tsunogai, U. ; Hasegawa, H. ; Yamano, H. / The coral δ15N record of terrestrial nitrate loading varies with river catchment land use. In: Coral Reefs. 2015 ; Vol. 34, No. 1. pp. 353-362.
@article{4a4333dfe1e3445e841923916f899216,
title = "The coral δ15N record of terrestrial nitrate loading varies with river catchment land use",
abstract = "We analysed the nitrogen isotopes in two coral cores (δ15Ncoral) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δ15Ncoral reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δ15Ncoral for 14 years (CORE1; 1993–2007) and the annual variation of δ15Ncoral for 52 years (CORE2; 1958–2010). In CORE1, the 5-month running mean of δ15Ncoral was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d−1). In CORE2, the δ15Ncoral mean in the earlier period (1958–1980) was 1.0 ‰ greater than that in the later period (1981–2010). The annual averages of δ15Ncoral are positively correlated with the total precipitation in the rainy season (May–June) for both time periods. The difference in the δ15Ncoral between the earlier and later periods is probably caused by the land use changed from paddy fields with 15N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δ15N coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.",
author = "Atsuko Ishida and T. Watanabe and U. Tsunogai and H. Hasegawa and H. Yamano",
year = "2015",
month = "1",
day = "1",
doi = "10.1007/s00338-014-1235-1",
language = "English",
volume = "34",
pages = "353--362",
journal = "Coral Reefs",
issn = "0722-4028",
publisher = "Springer Verlag",
number = "1",

}

TY - JOUR

T1 - The coral δ15N record of terrestrial nitrate loading varies with river catchment land use

AU - Ishida, Atsuko

AU - Watanabe, T.

AU - Tsunogai, U.

AU - Hasegawa, H.

AU - Yamano, H.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We analysed the nitrogen isotopes in two coral cores (δ15Ncoral) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δ15Ncoral reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δ15Ncoral for 14 years (CORE1; 1993–2007) and the annual variation of δ15Ncoral for 52 years (CORE2; 1958–2010). In CORE1, the 5-month running mean of δ15Ncoral was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d−1). In CORE2, the δ15Ncoral mean in the earlier period (1958–1980) was 1.0 ‰ greater than that in the later period (1981–2010). The annual averages of δ15Ncoral are positively correlated with the total precipitation in the rainy season (May–June) for both time periods. The difference in the δ15Ncoral between the earlier and later periods is probably caused by the land use changed from paddy fields with 15N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δ15N coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.

AB - We analysed the nitrogen isotopes in two coral cores (δ15Ncoral) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δ15Ncoral reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δ15Ncoral for 14 years (CORE1; 1993–2007) and the annual variation of δ15Ncoral for 52 years (CORE2; 1958–2010). In CORE1, the 5-month running mean of δ15Ncoral was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d−1). In CORE2, the δ15Ncoral mean in the earlier period (1958–1980) was 1.0 ‰ greater than that in the later period (1981–2010). The annual averages of δ15Ncoral are positively correlated with the total precipitation in the rainy season (May–June) for both time periods. The difference in the δ15Ncoral between the earlier and later periods is probably caused by the land use changed from paddy fields with 15N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δ15N coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.

UR - http://www.scopus.com/inward/record.url?scp=84925504618&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84925504618&partnerID=8YFLogxK

U2 - 10.1007/s00338-014-1235-1

DO - 10.1007/s00338-014-1235-1

M3 - Article

AN - SCOPUS:84925504618

VL - 34

SP - 353

EP - 362

JO - Coral Reefs

JF - Coral Reefs

SN - 0722-4028

IS - 1

ER -