Accessing BCO-DMO data
Brought to you by BCO-DMO
|
|
BCO-DMO ERDDAP
Accessing BCO-DMO data |
log in
Brought to you by BCO-DMO |
| griddap | Subset | tabledap | Make A Graph | wms | files | Accessible | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| log in | [Water column nutrient data 2018-2022] - Water column nutrient data from a 4 year experiment (2018-2022) manipulating consumer pressure and nutrient availability on a coral reef in Moorea, French Polynesia (Collaborative Research: Tipping points in coral reefs and their associated microbiomes: interactive effects of herbivory, nutrient enrichment, and temperature) | Here we experimentally test the relative importance of alterations to top-down and bottom-up processes in driving community development and variability after a simulated disturbance on a coral reef. We use a factorial experiment manipulating consumer pressure and nutrient enrichment for four years on a coral reef in Moorea, French Polynesia. Our experiment consisted of plots (~1.25 m2 each) that manipulated access by consumers via different size openings that allowed different size fishes access to the benthos, creating four levels of consumer pressure (Very Low, Low, Medium, High). These four levels of consumer pressure were crossed with manipulations of nutrient availability with either ambient or nutrient enriched conditions. At the start of the experiment, we removed all live corals and fleshy macroalgae from the plots to mimic the effects of a severe cyclone. We quantified the abundance of benthic organisms (e.g., corals, macroalgae, etc.) for four years to assess how experimental treatments affected community development. At three time points each year (April, July/August, November - except for two time points missed due to the COVID-19 pandemic, April 2020 and November 2020), we quantified benthic cover in each exclosure via point contacts on orthorectified photomosaics. \n \nTo evaluate the effectiveness of our nutrient treatment, we collected water samples using 50-ml syringes ~3cm above the benthos in each of our High consumer pressure exclosures (i.e., our open 1.25m2 exclosures). We collected water samples in 2021 and 2022 across a range of days after we swapped the nutrient diffusers (4-158 days). We filtered samples (GF/F) into falcon tubes, placed on ice and once back in the lab frozen until analysis. We analyzed inorganic nitrogen (nitrite + nitrate) and soluble reactive phosphorus concentrations using an autoanalyzer at the Marine Science Institute Analytical Laboratory at the University of California, Santa Barbara. For both nitrite + nitrate and phosphate, we averaged across time and our High consumer pressure exclosures to evaluate the average nutrient conditions in our experimental treatments.\n\ncdm_data_type = Other\nVARIABLES:\nBlock_plot (unitless)\nNutrient_TRT (unitless)\nDate_taken (unitless)\nDays_since_nutrient_swap (Days)\n... (5 more variables)\n | BCO-DMO | bcodmo_dataset_1000890_v1 |