biomedi

Recent studies demonstrate that marine N 2 fixation can be carried out without light. However, direct measurements of N 2 fixation in dark environments are relatively scarce. This study uses a model that represents biogeochemical cycles at a deep-ocean location in the Gulf of Aqaba (Red Sea). Different model versions are used to test assumptions about N 2 fixers. Download Aplikasi Wifi Buat Pc. Relaxing light limitation for marine N 2 fixers improved the similarity between model results and observations of deep nitrate and oxygen. To investigate responses of the calcifying E. Huxleyi to multiple environmental factors, we investigated its growth, POC and PIC quotas and photosynthesis parameter at different levels of CO 2, light, dissolved inorganic nitrogen and phosphate concentrations.

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High CO 2 (HC) and low nitrogen (LN) synergistically decreased growth rates, high light compensated for inhibition of low phosphate (LP) on growth rates at LC, but exacerbated inhibition of LP at HC. LN or LP increased PIC quotas and ETRmax. Based on a wide set of chemical and physical analyses applied to a sediment record, we found that although long-term climate variability has modulated depositional conditions and bottom water oxygenation in the coastal northern Baltic Sea over the past 1,500 years, the oxygen loss during the 20 th is unprecedentedly severe and has largely been driven by human-induced nutrient inputs form the catchment, emphasizing the need to reduce nutrient discharges to alleviate oxygen depletion in the future. Surface waters of the western tropical South Pacific were sampled along a longitudinal 4000 km transect during the stratified period between the Melanesian Archipelago and the western part of the South Pacific gyre. America Edition Ethics In Reader Second Source. We found a significant biological carbon pump sustained almost exclusively by N 2 fixation and essentially controlled by phosphate availability in the iron-replete Melanesian Archipelago waters which appears to be a net sink for atmospheric CO 2 while the gyre is in quasi steady state. Effects of an expanding great cormorant colony on small mammals was evaluated. Increase of the number of breeding bird pairs led to increased δ 13C and δ 15N values in the hair of mice after the first year of nest appearance.