Nutrient Diffusing Substrates (NDS)

Knowledge graph centered on Nutrient Diffusing Substrates (NDS) with 68 nodes and 131 connections. Top connected: Atriplex canescens, Nutrient availability and phytoplankton nutrient l, Bacteria, climate change, elevational gradients.

Method synopsis

Factorial experimental design using artificial stream channels to test temperature and nutrient effects on algae growth. Solar heating systems create temperature gradients while drip systems deliver controlled nutrient ratios.

Synthesized from method descriptions across 8 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Does the morphology of beaver ponds alter downstream ecosystems? (2011), Hydrobiologia. The protocol was originally introduced by Dissolved iron stimulates uptake of organic phosphorus by <i>Didymosphenia geminata</i> (2010). Implementations in other papers (listed below) may differ.

1. Nutrient limitation experiments
   Deployed nutrient diffusing substrates upstream and downstream at 10 sites in 2008. Incubated NDS in streams for 17 days and then frozen in film canisters for chlorophyll a extraction. Eight replicates of four treatments deployed: +Nitrogen (N), +Phosphorus (P), +Nitrogen and Phosphorus (N + P), and Control (C). Used KaNO3 for nitrogen additions and KH2PO4 for phosphorus additions. Added nutrients to agar at 0.5 M concentration.
   Quantities: 10 sites, 8 replicates per treatment, 4 treatments, 17-day incubationDuration: 17-day incubation period in summer 2008Conditions: In-stream deployment during summer 2008
   Equipment: nutrient diffusing substrates, film canisters, KaNO3, KH2PO4, agar

Typical Equipment

• vinyl rain gutters
• ½ horsepower irrigation pump
• solar heating coil systems
• HOBO data loggers
• 20 L plastic buckets

Output Measurements

• water temperature
• didymo cell density

Papers Using This Protocol (8)

Species Studied With This Protocol