Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake Donghu: spatial change
We estimated phosphorus flux mediated by benthic invertebrates from the sediments to the water in a shallow eutrophic lake (lake Donghu, central China) and quantified spatial (littoral and central sites) and specific (among different benthic taxa) differences. The mass-specif...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2011-11-01
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| Series: | Knowledge and Management of Aquatic Ecosystems |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1051/kmae/2011073 |
| _version_ | 1828418809590972416 |
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| author | Ji L. Berezina N.A. Golubkov S.M. Cao X. Golubkov M.S. Song C. Umnova L.P. Zhou Y. |
| author_facet | Ji L. Berezina N.A. Golubkov S.M. Cao X. Golubkov M.S. Song C. Umnova L.P. Zhou Y. |
| author_sort | Ji L. |
| collection | DOAJ |
| description | We estimated phosphorus flux mediated by benthic invertebrates from the sediments
to the water in a shallow eutrophic lake (lake Donghu, central China) and quantified spatial
(littoral and central sites) and specific (among different benthic taxa) differences. The
mass-specific excretion rates of phosphorus (soluble reactive phosphorus (SRP, ηmol·mg dry
mass–1·h–1) by benthic invertebrates (abundant taxa) were
estimated experimentally and calculated as a final minus of initial nutrient mass divided by
dry mass of organisms. Results showed high importance of chironomid larvae as a contributor
to the total P flux from sediments to water in shallow lake Donghu. Benthic biomass (from
0.002 to 32.8 g dry mass·m–2) distribution and species composition (31 taxa) were
studied (October 2009) in three regions of lake Donghu (Guozhenghu, Miaohu, Yujiahu) using
samples from three depths: the shallow littoral site (0.2–1 m depth), central site with 2 m
depth, and central site with more than 3 m depth. The total estimated SRP excretion by
benthic invertebrate reaches 36% of the direct SPR flux from sediments to water in this
lake. The phosphorus regeneration by benthic animals is the most intensive in the shallow
littoral sites (69.5 µmol P·m–2·day–1) and at least 20 times greater
than in central sites (3.4 µmol P·m–2·day–1) of lake Donghu. The
results support notable differences in the SRP excretion rates between taxa and sites. The
spatial difference in the SRP flux might be considered as a general feature of lakes with
periodical changing oxygen near bottom. |
| first_indexed | 2024-12-10T14:42:38Z |
| format | Article |
| id | doaj.art-6a6230fadb7e4035a2d308208c0b4964 |
| institution | Directory Open Access Journal |
| issn | 1961-9502 |
| language | English |
| last_indexed | 2024-12-10T14:42:38Z |
| publishDate | 2011-11-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Knowledge and Management of Aquatic Ecosystems |
| spelling | doaj.art-6a6230fadb7e4035a2d308208c0b49642022-12-22T01:44:39ZengEDP SciencesKnowledge and Management of Aquatic Ecosystems1961-95022011-11-0104021110.1051/kmae/2011073kmae110031Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake Donghu: spatial changeJi L.Berezina N.A.0Golubkov S.M.1Cao X.2Golubkov M.S.3Song C.4Umnova L.P.5Zhou Y.6Zoological Institute, Russian Academy of ScienceZoological Institute, Russian Academy of ScienceInstitute of Hydrobiology, Chinese Academy of SciencesZoological Institute, Russian Academy of ScienceInstitute of Hydrobiology, Chinese Academy of SciencesZoological Institute, Russian Academy of ScienceInstitute of Hydrobiology, Chinese Academy of SciencesWe estimated phosphorus flux mediated by benthic invertebrates from the sediments to the water in a shallow eutrophic lake (lake Donghu, central China) and quantified spatial (littoral and central sites) and specific (among different benthic taxa) differences. The mass-specific excretion rates of phosphorus (soluble reactive phosphorus (SRP, ηmol·mg dry mass–1·h–1) by benthic invertebrates (abundant taxa) were estimated experimentally and calculated as a final minus of initial nutrient mass divided by dry mass of organisms. Results showed high importance of chironomid larvae as a contributor to the total P flux from sediments to water in shallow lake Donghu. Benthic biomass (from 0.002 to 32.8 g dry mass·m–2) distribution and species composition (31 taxa) were studied (October 2009) in three regions of lake Donghu (Guozhenghu, Miaohu, Yujiahu) using samples from three depths: the shallow littoral site (0.2–1 m depth), central site with 2 m depth, and central site with more than 3 m depth. The total estimated SRP excretion by benthic invertebrate reaches 36% of the direct SPR flux from sediments to water in this lake. The phosphorus regeneration by benthic animals is the most intensive in the shallow littoral sites (69.5 µmol P·m–2·day–1) and at least 20 times greater than in central sites (3.4 µmol P·m–2·day–1) of lake Donghu. The results support notable differences in the SRP excretion rates between taxa and sites. The spatial difference in the SRP flux might be considered as a general feature of lakes with periodical changing oxygen near bottom.http://dx.doi.org/10.1051/kmae/2011073phosphorusexcretionzoobenthosspatial distributionshallow lake |
| spellingShingle | Ji L. Berezina N.A. Golubkov S.M. Cao X. Golubkov M.S. Song C. Umnova L.P. Zhou Y. Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake Donghu: spatial change Knowledge and Management of Aquatic Ecosystems phosphorus excretion zoobenthos spatial distribution shallow lake |
| title | Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake
Donghu: spatial change |
| title_full | Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake
Donghu: spatial change |
| title_fullStr | Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake
Donghu: spatial change |
| title_full_unstemmed | Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake
Donghu: spatial change |
| title_short | Phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake
Donghu: spatial change |
| title_sort | phosphorus flux by macrobenthic invertebrates in a shallow eutrophic lake donghu spatial change |
| topic | phosphorus excretion zoobenthos spatial distribution shallow lake |
| url | http://dx.doi.org/10.1051/kmae/2011073 |
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