Microbial nutrient limitation in arctic lakes in a permafrost landscape of southwest Greenland

Abstract

Abstract. Permafrost is degrading across regions of the Arctic, which can lead to increases in nutrient concentrations in surface freshwaters. The oligotrophic state of many arctic lakes suggests that enhanced nutrient inputs may have important effects on these systems, but little is known about microbial nutrient limitation patterns in these lakes. We investigated microbial extracellular enzyme activities (EEAs) to infer seasonal nutrient dynamics and limitation across 24 lakes in southwest Greenland during summer (June and July). From early to late summer, enzyme activities that indicate microbial carbon (C), nitrogen (N), and phosphorus (P) demand increased in both the epilimnia and hypolimnia by 74 % on average. Microbial investment in P acquisition was generally higher than that for N. Interactions among EEAs indicated that bacteria were primarily P limited. Dissolved organic matter (DOM, measured as dissolved organic carbon) was strongly and positively correlated with microbial P demand (R2 = 0.84 in July), while there were no relationships between DOM and microbial N demand. Microbial P limitation in June epilimnia (R2 = 0.67) and July hypolimnia (R2 = 0.57) increased with DOM concentration. The consistency of microbial P limitation from June to July was related to the amount of DOM present, with some low DOM lakes becoming N-limited in July. Our results suggest that future changes in P or DOM inputs to these lakes are likely to alter microbial nutrient limitation patterns.

A whole‐lake experiment confirms a small centric diatom species as an indicator of changing lake thermal structure

“…From the early and late season manually collected water samples, nutrients and DOC were measured as described in Burpee et al (). Chl a was extracted in acetone and analyzed with a spectrophotometer (Varian Cary50).…”

The shift of mutualistic relationships among algae, free-living and attached bacteria through different nutrient addition mode: a mesocosm study

“…It is worth to note that in this study excessive organic C input could more limit algal growth than excessive inorganic P input (Figure 1). DOC was strongly and positively correlated with microbial P demand, further accelerating microbial P uptake and resulting in P limitation in lakes (Burpee et al 2016). The N fertilization increased phytoplankton biomass and production in all lakes.…”

Kelimpahan Fitoplankton Sebagai Indikator Kualitas Perairan Di Perairan Laut Labangka, Kabupaten Sumbawa

“…Bahan organik dapat berpengaruh pada kelimpahan fitoplankton di perairan karena dapat menjadi sumber nutrient yang bahkan dapat memicu blooming fitoplankton. Fitoplankton dapat menggunakan bahan organik sebagai sumber karbon, nitrogen, dan fosfor ketika nutrient anorganik tidak tersedia di perairan Burpee et al, (2016) dalam (Liu et al, 2016). Berdasarkan hasil analisis korelasi, diketahui bahwa konsentrasi BOT memiliki korelasi yang kuat dengan kelimpahan fitoplankton, namun korelasi ini tidak searah.…”