Dataset: Algal Ash-Free Dry Weight - Cerro Mundo 2

Name: Nearshore Shallow Subtidal Macroalgal Preburn, Postburn and Ash-Free Dry Weight Data from October 2022 (Galapagos 2021 project)
Published: 2023-07-18
Keywords: biomass, benthic primary production, Galapagos, upwelling, oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:-0.87044 E:-89.58189 S:-0.87044 W:-89.58189

Temporal Extent: 2022-10 - 2022-10

Project:

Temperature Regulation of Top-Down Control in a Pacific Upwelling System (Galapagos 2021)

Principal Investigator:

John Bruno (University of North Carolina at Charlotte, UNCC)

Student:

Isabel Silva Romero (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Contact:

Isabel Silva Romero (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-07-18

Restricted:

Validated:

Current State:

Preliminary and in progress

Nearshore Shallow Subtidal Macroalgal Preburn, Postburn and Ash-Free Dry Weight Data from October 2022 (Galapagos 2021 project)

Abstract:

Increased standing macroalgal biomass in upwelling zones is generally assumed to be the result of higher nutrient flux due to upwelled waters, However, other factors can strongly impact macroalgal communities. For example, herbivory and temperature, via their effects on primary producers and the metabolic demands of consumers, can also influence macroalgal biomass and productivity, respectively. Although there is a fair number of studies looking at the interactive effects of herbivores and nutrients in both tropical and temperate regions, there is a lack of studies looking at these effects in tropical or subtropical upwelling regions. The purpose of this study was to measure the effects that herbivores, temperature, and nutrient availability have on standing macroalgal biomass. We manipulated nutrient availability and herbivory in six field experiments during contrasting productivity and thermal regimes (cool-upwelling and warm, non-upwelling season) on a subtidal nearshore rocky reef. Here, we present the macroalgal biomass raw data (Preburn, Postburn, and Ash-Free Dry Weight) collected in the nearshore shallow subtidal during an October 2022 field experiment.

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Methods & Sampling

Methods & Sampling:

Macroalgae accumulated in exclusion and open cages (deployed in the seafloor) was scraped and vacuumed into independent collection mesh bags after four-week trial in October 2022 (09/15 to 10/13). Ash-Free Dry Weight (AFDW) of the macroalgae samples was determined by drying each sample in an oven for 24 hours at 60 °C and then burning it in a muffle furnace for 4 hours at 500 °C.

Data Processing Description

BCO-DMO Processing Notes:

In column names, spaces were replaced with underscores ("_")
Non underscore special characters were removed from column header names

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2128592

Deployments

None available yet

Instruments

Drying Oven

Supplied Name: Drying Oven (Memmert UFE 400 Sterilizer Laboratory Oven)

Supplied Description:

Macroalgae samples were dried in a drying oven for 24 hours at 60° C.

Instrument Type

Generic Name: Drying Oven

Generic Description:

a heated chamber for drying

muffle furnace

Supplied Name: Optic Ivymen System Laboratory Furnace 8.2/1100

Supplied Description:

Macroalgae samples were burned in a muffle furnace for 4 hours at 500 °C.

Instrument Type

Generic Name: muffle furnace

Generic Description:

A muffle furnace or muffle oven (sometimes retort furnace in historical usage) is a furnace in which the subject material is isolated from the fuel and all of the products of combustion, including gases and flying ash. A type of jacketed enclosure that is used to heat a material to significantly high temperatures while keeping it contained and fully isolated from external contaminants, chemicals or substances. Muffle furnaces are usually lined with stainless steel, making them largely corrosion-resistant.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Cage	replicate number	unitless	replicate
Treatment	Four types of experimental treatments were used: (All Present) Open pizzas (treatment cages of circular bases only) with full access to all grazers. (Urchins Only) Urchin inclusions, where two pencil urchins remained caged throughout the duration of each trial to maintain the identity and density of our herbivore of interest constant. (None Present) Full exclusions, preventing access to all macro-herbivores such as sea urchins, fishes, iguanas, and turtles, but not to meso-herbivores such as amphipods. These cages are covered with a top. (Procedural) Procedural control that included partial sides, designed to affect flow and light to a similar degree as other cages to test for experimental artifacts of the herbivore manipulation.	unitless	treatment
N	description	unitless	N
Algae_Type	Type of macroalgae in sample; algae type in data is either Red filamentous (RF) or Ulva (Ulva).	unitless	sample_type
Foil_cup_weight_g	Weight of only the aluminum foil cup before placing the wet algae sample; blank data values indicate there was no growth of macroalgae for that specific replicate.	grams	weight
Sample_and_foil_cup_weight_g	Weight of algae sample and aluminum foil after the sample was dried in the drying oven; blank data values indicate there was no growth of macroalgae for that specific replicate.	grams	weight
Preburn_weight_calculation_g	Subtraction of Foil_cup_weight_g from Sample_and_foil_cup_weight_g after the sample was dried in the drying oven; blank data values indicate there was no growth of macroalgae for that specific replicate.	grams	weight
Ceramic_cup_weight_g	Weight of only the ceramic melting pot before placing the dried algae sample; blank data values indicate there was no growth of macroalgae for that specific replicate.	grams	weight
Sample_and_ceramic_cup_weight_g	Weight of algae sample and ceramic melting pot after the sample was burned in the muffle furnace; blank data values indicate there was no growth of macroalgae for that specific replicate	grams	weight
Postburn_weight_calculation_g	Subtraction of Ceramic_cup_weight_g from Sample_and_ceramic_cup_weight_g; blank data values indicate there was no growth of macroalgae for that specific replicate	grams	weight
AFDW_Preburn_minus_Postburn_weight_calculation_g	Subtraction of Preburn weight from Postburn weight; blank data values indicate there was no growth of macroalgae for that specific replicate	grams	weight

Database

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Dataset: Algal Ash-Free Dry Weight - Cerro Mundo 2