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Seasonal and site-specific variability in terrigenous particulate organic carbon concentration in near-shore waters of Lake Biwa, Japan
- Source :
- Limnology. 14(2):167-177
- Publication Year :
- 2013
- Publisher :
- Springer Japan, 2013.
-
Abstract
- Identifying sources of particulate organic matter (POM) is important for clarifying fundamental mechanisms by which lake food webs are sustained. We determined carbon and nitrogen stable isotope ratios of POM in near-shore waters of Lake Biwa, a large, meso-eutrophic lake in Japan, to estimate relative contributions of terrigenous particulate organic carbon (T-POC), plankton-derived POC (P-POC) and epilithon-derived POC (E-POC) to POC in near-shore waters. Samples were collected during different months (November, February, May and July) at 29 sites located near the mouth of tributary rivers with different discharge and catchment land use. The data revealed that POC mainly consisted of P-POC and T-POC, with relative contributions varying widely over season and among locations. E-POC generally contributed little to the near-shore POC. Path analyses revealed that the concentration of riverine POC whose isotopic signatures were similar to those of rice straws increased with a larger %paddy field area in the catchment of tributary rivers, which subsequently enhanced T-POC inputs to near-shore waters through riverine transportation. Furthermore, our results suggested that T-POC contribution was influenced, with a time lag, by wave-driven turbulence and shore topography, which appear to affect sedimentation and resuspension of T-POC.
- Subjects :
- Shore
Hydrology
geography
Particulate organic carbon
geography.geographical_feature_category
Ecology
Terrigenous sediment
Stable isotope ratio
Terrigenous POM
Drainage basin
chemistry.chemical_element
Aquatic Science
Nitrogen
Allochthonous input
Oceanography
chemistry
Tributary
Land use
Environmental science
Paddy field
sotope mixing model
Path analysis
Water Science and Technology
Subjects
Details
- Language :
- English
- ISSN :
- 14398621
- Volume :
- 14
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Limnology
- Accession number :
- edsair.doi.dedup.....0441d76ae930c32ae0a44127e233fe8f