Water column nutrient concentrations are related to excretion by benthic invertebrates in Lake Taihu, China

Üniversitemiz ziyaretçi araştırmacılarından Prof. Dr. Erik Jeppesen’in yazarları arasında bulunduğu “Water column nutrient concentrations are related to excretion by benthic invertebrates in Lake Taihu, China” başlıklı makale Environmental Pollution’da yayınlandı.

Internal release of nutrients is an important contributor to the nutrient dynamics in shallow eutrophic lakes. Zoobenthic organisms may contribute to this release by excreting nutrients to the overlaying water. Based on experiments and using results from previous experimental studies as well as field monitoring density data from 2007 to 2017, we calculated the annual and seasonal nutrient excretions of the two most common macroinvertebrates (Corbicula fluminea and Limnodrilus hoffmeisteri) in Lake Taihu, China. We compared these rates with the concentrations of NH4–N, total nitrogen (TN), PO4–P and total phosphorus (TP) in the lake water as well as with previous results of release rates from undisturbed sediments collected in the lake. The spatial distribution of nutrient excretion by the two invertebrate species varied markedly among sites and years. Regression analyses revealed significant relationships between total nutrient excretions by these two species and the concentrations of NH4–N, TN, PO4–P and TP in the lake, but with seasonal differences. The relationship was overall strongest in winter, followed by spring, and weakest in summer and autumn. The flux of NH4–N and PO4–P released by the two macroinvertebrate species were equivalent to as much as 50% and 66%, respectively, of the sediment release recorded in lab experiments under undisturbed conditions; however, the percentages would be somewhat lower under field conditions where the sediment is subjected to frequent wind-induced resuspension and fish disturbance, enhancing the release rates. The release declined during the study period due to a reduction in the density of macroinvertebrates, perhaps indicating increasing stocking of fish since 2007. Our results indicate that benthic invertebrates are important contributor to the internal loading in shallow eutrophic lakes.

Peng, K., Qin, B., Cai, Y., Gong, Z., & Jeppesen, E. (2020). Water column nutrient concentrations are related to excretion by benthic invertebrates in lake taihu, china. Environmental Pollution, 261 doi:10.1016/j.envpol.2020.114161

Makaleye erişim için: https://www.sciencedirect.com/science/article/pii/S0269749119350651

Etiketler/Anahtar sözcükler:

Internal release, Macroinvertebrates excretion, Nutrient concentrations

Diğer Yazarlar:
Peng, K., Qin, B., Cai, Y., & Gong, Z.

Ek Bilgiler:
This work was jointly Supported by the Major Science and Technology Program for Water Pollution Control and Treatment ( 2017ZX07203-004 ), the National Natural Science Foundation of China (Grants No. 41621002 , 41671110 , 31670466 ), Project of Science and Technology of Water Resources Department of Jiangsu Province (Grants No. 2019005 , 2018039 , 2017049 ) and the "One-Three-Five" Strategic Planning of Nanjing Institute of Geography and Limnology of Chinese Academy of Sciences (Grant No. NIGLAS2017GH05 ). Erik Jeppesen was supported by Tübitak, BIDEB 2232.