مقالات اکولوژی

Internal loading of phosphate in Lake Erie Central Basin
Science of The Total Environment (2016)
Adina Paytan, Kathryn Roberts, Sue Watson, Sara Peek, Pei-Chuan Chuang, Delphine Defforey, Carol Kendall
After significant reductions in external phosphorus (P) loads, and subsequent water quality improvements in the early 1980s, the water quality of Lake Erie has declined considerably over the past decade. The frequency and magnitude of harmful algal blooms (primarily in the western basin) and the extent of hypoxic bottom waters in the central basin have increased. The decline in ecosystem health, despite meeting goals for external P loads, has sparked a renewed effort to understand P cycling in the lake. We use pore-water P concentration profiles and sediment cores incubation experiments to quantify the P flux from Lake Erie central basin sediments. In addition, the oxygen isotopes of phosphate were investigated to assess the isotopic signature of sedimentary phosphate inputs relative to the isotopic signature of phosphate in lake water. Extrapolating the total P sediment flux based on the pore-water profiles to the whole area of the central basin ranged from 300 to 1250metric tons per year and using the flux based on core incubation experiments an annual flux of roughly 2400metric tons of P is calculated. These estimates amount to 8–20% of the total external input of P to Lake Erie. The isotopic signature of phosphate in the extractable fraction of the sediments (~18‰) can explain the non-equilibrium isotope values of dissolved phosphate in the deep water of the central basin of Lake Erie, and this is consistent with sediments as an important internal source of P in the Lake
Palaeobiology of an extinct Ice Age mammal: Stable isotope and cementum analysis of giant deer teeth
Palaeogeography, Palaeoclimatology, Palaeoecology (2009)
Oxygen and carbon stable isotopes in otoliths record spatial isolation of Patagonian toothfish (Dissostichus eleginoides)
Geochimica et Cosmochimica Acta (2007)
Variations in the D/H and 18O/16O ratios in cellulose extracted from a peat bog core
Earth and Planetary Science Letters (1982)

اطلاعات تماس

اراک - میدان بسیج - بلوار کربلا - دانشگاه اراک - آزمایشگاه مرکزی- مرکز تحقیقات ایزوتوپهای پایدار

Email: a-sirl@araku.ac.ir

تلفن : ۳۲۶۲۲۸۲۲ ۰۸۶ - ۳۲۶۲۲۸۲۰ ۰۸۶

امکانات

آزمایشگاه تحقیقاتی ایزوتوپهای پایدار شامل یک آزمایشگاه دستگاهی، یک آزمایشگاه آماده سازی نمونه و یک انبار نگهداری نمونه ها می باشد.

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