Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Estuarine, Coastal and Shelf Science |
| Vol/bind | 85 |
| Udgave nummer | 2 |
| Sider (fra-til) | 319-326 |
| ISSN | 0272-7714 |
| DOI | |
| Status | Udgivet - 2009 |
Bibliografisk note
Keywords: sediment; iron; sulfate reduction rates; anthropogenic pressuresAdgang til dokumentet
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I: Estuarine, Coastal and Shelf Science, Bind 85, Nr. 2, 2009, s. 319-326.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Sulfide intrusion in the tropical seagrasses Thalassia testudinum and Syringodium filiforme
AU - Holmer, Marianne
AU - Pedersen, Ole
AU - Krause-Jensen, Dorte
AU - Olesen, Birgit
AU - Petersen, Malene Hedegård
AU - Schopmeyer, Stephanie
AU - Koch, Marguerite
AU - Lomstein, Bente Aa.
AU - Jensen, Henning S.
N1 - Keywords: sediment; iron; sulfate reduction rates; anthropogenic pressures
PY - 2009
Y1 - 2009
N2 - Sulfur and oxygen dynamics in the seagrasses Thalassia testudinum and Syringodium filiforme and their sediments were studied in the US Virgin Islands (USVI) in order to explore sulfide intrusion into tropical seagrasses. Four study sites were selected based on the iron concentration in sediments and on proximity to anthropogenic nutrient sources. Meadow characteristics (shoot density, above- and below-ground biomass, nutrient content) were sampled along with sediment biogeochemistry. Sulfide intrusion was high in T. testudinum, as up to 96% of total sulfur in the plant was derived from sediment-derived sulfides. The sulfide intrusion was negatively correlated to the turnover of sulfides in the sediments regulated by both plant parameters and sediment sulfur pools. Sediment iron content played an indirect role by affecting sulfide turnover rates. Leaf production was negatively correlated with sulfide intrusion suggesting that active growth reduced sulfide intrusion. Sulfide intrusion was lower in S. filiforme (up to 44%) compared to T. testudinum consistent with a higher internal nighttime oxygen concentrations found for S. filiforme. When S. filiforme can take advantage of its ability to maintain high internal oxygen concentrations, as was the case on the USVI, it could increase its success in colonizing unvegetated disturbed sediments with potentially high sulfide concentrations.
AB - Sulfur and oxygen dynamics in the seagrasses Thalassia testudinum and Syringodium filiforme and their sediments were studied in the US Virgin Islands (USVI) in order to explore sulfide intrusion into tropical seagrasses. Four study sites were selected based on the iron concentration in sediments and on proximity to anthropogenic nutrient sources. Meadow characteristics (shoot density, above- and below-ground biomass, nutrient content) were sampled along with sediment biogeochemistry. Sulfide intrusion was high in T. testudinum, as up to 96% of total sulfur in the plant was derived from sediment-derived sulfides. The sulfide intrusion was negatively correlated to the turnover of sulfides in the sediments regulated by both plant parameters and sediment sulfur pools. Sediment iron content played an indirect role by affecting sulfide turnover rates. Leaf production was negatively correlated with sulfide intrusion suggesting that active growth reduced sulfide intrusion. Sulfide intrusion was lower in S. filiforme (up to 44%) compared to T. testudinum consistent with a higher internal nighttime oxygen concentrations found for S. filiforme. When S. filiforme can take advantage of its ability to maintain high internal oxygen concentrations, as was the case on the USVI, it could increase its success in colonizing unvegetated disturbed sediments with potentially high sulfide concentrations.
U2 - 10.1016/j.ecss.2009.08.015
DO - 10.1016/j.ecss.2009.08.015
M3 - Journal article
SN - 0272-7714
VL - 85
SP - 319
EP - 326
JO - Estuarine, Coastal and Shelf Science
JF - Estuarine, Coastal and Shelf Science
IS - 2
ER -