ERDDAP > info > bcodmo_dataset_755712

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	Laboratory study of estimates of per capita sea urchin grazing rates on Clathromorphum nereostratum, evaluated as a function of sea urchin size		I   M	background			BCO-DMO	bcodmo_dataset_755712

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv
attribute	NC_GLOBAL	acquisition_description	String	We conducted a controlled laboratory experiment to test whether the capacity of S. polyacanthus to consume C. nereostratum scales with its size. Conducted under ambient light and continuous water flow (mean water temperature ~8.5 degrees C), this feeding experiment consisted of five sea urchin size classes (15-55 mm test diameter; binned in 10 mm size classes, n = 5/size class). Size classes were evenly distributed among blocks (n = 5), with each block including a control alga (i.e., C. nereostratum caged alone) to account for algal growth as well as loss due to factors other than herbivory (see calculation below). Urchins were individually housed with a single C. nereostratum colony. We assessed the blotted wet mass of each C. nereostratum at the beginning of the assay, then again after 10 days. We calculated the (corrected) amount of C. nereostratum consumed in each assay using the equation [Ti x (Cf/Ci)] - Tf, where Ti and Tf is the initial and final mass (respectively) of an alga exposed to herbivory and Ci and Cf is the initial and final mass (respectively) of its paired control. After computing per capita grazing rate (\"amount.mg.consumed/day\") for each urchin, we also standardized each per capita grazing rate by the estimated biomass (calculated via a known size-weight relationship) of the individual urchin (\"amount.mg.consumed/d/gram.urchin\"). Finally, we quantified the maximum depth (mm) to which each urchin grazed C. nereostratum by examining each sample under a microscope and measuring the depth of the most significant grazing scar using an ocular micrometer.
attribute	NC_GLOBAL	awards_0_award_nid	String	526658
attribute	NC_GLOBAL	awards_0_award_number	String	PLR-1316141
attribute	NC_GLOBAL	awards_0_data_url	String	http://nsf.gov/awardsearch/showAward?AWD_ID=1316141
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Arctic Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF ARC
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	390
attribute	NC_GLOBAL	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Estimates of per capita sea urchin grazing rates on Clathromorphum nereostratum PI's: Steneck (Umaine), J. Estes (UCSC), D. Rasher (BLOS) version: 2019-02-013
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2019-02-13T20:50:58Z
attribute	NC_GLOBAL	date_modified	String	2019-02-25T20:37:51Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.755712.1
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/755712
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	keywords	String	amount, amount_grams_consumed, amount_mg_consumed, amount_mg_consumed_d_gram_urchin, amount_mg_consumed_day, bco, bco-dmo, biological, biomass, cca, cca_mass_final_grams, cca_mass_initial_grams, chemical, consumed, corrected, corrected_cca_mass_initial_grams, correction, correction_factor, data, dataset, day, depth, diameter, dmo, erddap, factor, final, gram, grams, grazed, initial, management, mass, max, max_depth_grazed_mm, oceanography, office, preliminary, replicate, treatment, urchin, urchin_biomass_grams, urchin_diameter_mm
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/755712/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/755712
attribute	NC_GLOBAL	param_mapping	String	{'755712': {'max_depth_grazed_mm': 'master - depth'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/755712/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Maine
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	U Maine DMC
attribute	NC_GLOBAL	people_0_person_name	String	Robert S. Steneck
attribute	NC_GLOBAL	people_0_person_nid	String	526659
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	University of California-Santa Cruz
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	UC Santa Cruz
attribute	NC_GLOBAL	people_1_person_name	String	James Estes
attribute	NC_GLOBAL	people_1_person_nid	String	51389
attribute	NC_GLOBAL	people_1_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Bigelow Laboratory for Ocean Sciences
attribute	NC_GLOBAL	people_2_person_name	String	Douglas B. Rasher
attribute	NC_GLOBAL	people_2_person_nid	String	480721
attribute	NC_GLOBAL	people_2_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_3_person_name	String	Nancy Copley
attribute	NC_GLOBAL	people_3_person_nid	String	50396
attribute	NC_GLOBAL	people_3_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_3_role_type	String	related
attribute	NC_GLOBAL	project	String	OA Kelp Forest Function
attribute	NC_GLOBAL	projects_0_acronym	String	OA Kelp Forest Function
attribute	NC_GLOBAL	projects_0_description	String	Extracted from the NSF award abstract: Marine calcifying organisms are most at risk to rapid ocean acidification (OA) in cold-water ecosystems. The investigators propose to determine if a globally unique and widespread calcareous alga in Alaska's Aleutian archipelago, Clathromorphum nereostratum, is threatened with extinction due to the combined effects of OA and food web alterations. C. nereostratum is a slow growing coralline alga that can live to at least 2000 years. It accretes massive 'bioherms' that dominate the regions' rocky substrate both under kelp forests and deforested sea urchin barrens. It develops growth bands (similar to tree rings) in its calcareous skeleton, which effectively record its annual calcification rate over centuries. Pilot data suggest the skeletal density of C. nereostratum began to decline precipitously in the 1990's in some parts of the Aleutian archipelago. The investigators now propose to use high-resolution microscopy and microCT imaging to examine how the growth and skeletal density of C. nereostratum has changed in the past 300 years (i.e., since the industrial revolution) across the western Aleutians. They will compare their records of algal skeletal densities and their variation through time with reconstructions of past climate to infer causes of change. In addition, the investigators will examine whether the alga's defense against grazing by sea urchins is compromised by ongoing ocean acidification. The investigators will survey the extent of C. nereostratum bioerosion occurring at 10 sites spanning the western Aleutians, both inside and outside of kelp forests. At each site they will compare these patterns to observed and monitored ecosystem trophic structure and recent C. nereostratum calcification rates. Field observations will be combined with laboratory experiments to determine if it is a decline in the alga's skeletal density (due to recent OA and warming), an increase in grazing intensity (due to recent trophic-level dysfunction), or their interactive effects that are likely responsible for bioerosion patterns inside vs. outside of forests. By sampling C. nereostratum inside and outside of forests, they will determine if kelp forests locally increase pH via photosynthesis, and thus buffer the effects of OA on coralline calcification. The combination of field observations with laboratory controlled experiments, manipulating CO2 and temperature, will help elucidate drivers of calcification and project how these species interactions will likely change in the near future. The project will provide the first in situ example of how ongoing ocean acidification is affecting the physiology of long-lived, carbonate producing organisms in the subarctic North Pacific. It will also be one of the first studies to document whether OA, ocean warming, and food web changes to ecological processes are interacting in complex ways to reshape the outcome of species interactions in nature.
attribute	NC_GLOBAL	projects_0_end_date	String	2016-08
attribute	NC_GLOBAL	projects_0_name	String	Ocean Acidification: Century Scale Impacts to Ecosystem Structure and Function of Aleutian Kelp Forests
attribute	NC_GLOBAL	projects_0_project_nid	String	526660
attribute	NC_GLOBAL	projects_0_start_date	String	2013-09
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	Estimates of per capita sea urchin grazing rates on Clathromorphum nereostratum, evaluated as a function of sea urchin size. Assays were performed under ambient conditions in a controlled mesocosm setting, using the urchin Strongylocentrotus polyacanthus.
attribute	NC_GLOBAL	title	String	Laboratory study of estimates of per capita sea urchin grazing rates on Clathromorphum nereostratum, evaluated as a function of sea urchin size
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	treatment		String
attribute	treatment	bcodmo_name	String	treatment
attribute	treatment	description	String	target size class of sea urchin
attribute	treatment	long_name	String	Treatment
attribute	treatment	units	String	millimeters
variable	replicate		byte
attribute	replicate	_FillValue	byte	127
attribute	replicate	actual_range	byte	1, 5
attribute	replicate	bcodmo_name	String	replicate
attribute	replicate	description	String	replicate individual urchin or alga
attribute	replicate	long_name	String	Replicate
attribute	replicate	units	String	unitless
variable	urchin_diameter_mm		byte
attribute	urchin_diameter_mm	_FillValue	byte	127
attribute	urchin_diameter_mm	actual_range	byte	15, 57
attribute	urchin_diameter_mm	bcodmo_name	String	diameter
attribute	urchin_diameter_mm	description	String	actual size (test diameter) of sea urchin
attribute	urchin_diameter_mm	long_name	String	Urchin Diameter Mm
attribute	urchin_diameter_mm	units	String	millimeters
variable	urchin_biomass_grams		float
attribute	urchin_biomass_grams	_FillValue	float	NaN
attribute	urchin_biomass_grams	actual_range	float	1.3, 69.4
attribute	urchin_biomass_grams	bcodmo_name	String	biomass
attribute	urchin_biomass_grams	description	String	biomass of sea urchin; estimated using known length-weight relationship
attribute	urchin_biomass_grams	long_name	String	Urchin Biomass Grams
attribute	urchin_biomass_grams	units	String	grams
variable	cca_mass_initial_grams		float
attribute	cca_mass_initial_grams	_FillValue	float	NaN
attribute	cca_mass_initial_grams	actual_range	float	4.269, 15.44
attribute	cca_mass_initial_grams	bcodmo_name	String	mass
attribute	cca_mass_initial_grams	description	String	initial mass of coralline alga
attribute	cca_mass_initial_grams	long_name	String	Cca Mass Initial Grams
attribute	cca_mass_initial_grams	units	String	grams
variable	cca_mass_final_grams		float
attribute	cca_mass_final_grams	_FillValue	float	NaN
attribute	cca_mass_final_grams	actual_range	float	4.208, 13.887
attribute	cca_mass_final_grams	bcodmo_name	String	mass
attribute	cca_mass_final_grams	description	String	final mass of coralline alga
attribute	cca_mass_final_grams	long_name	String	Cca Mass Final Grams
attribute	cca_mass_final_grams	units	String	grams
variable	correction_factor		float
attribute	correction_factor	_FillValue	float	NaN
attribute	correction_factor	actual_range	float	0.985, 0.997
attribute	correction_factor	bcodmo_name	String	unknown
attribute	correction_factor	description	String	correction factor; computed by dividing the final mass of the paired control alga by its initial mass (Cf/Ci)
attribute	correction_factor	long_name	String	Correction Factor
attribute	correction_factor	units	String	unitless
variable	corrected_cca_mass_initial_grams		float
attribute	corrected_cca_mass_initial_grams	_FillValue	float	NaN
attribute	corrected_cca_mass_initial_grams	actual_range	float	4.222, 15.353
attribute	corrected_cca_mass_initial_grams	bcodmo_name	String	mass
attribute	corrected_cca_mass_initial_grams	description	String	cca_mass_initial_grams * correction_factor
attribute	corrected_cca_mass_initial_grams	long_name	String	Corrected Cca Mass Initial Grams
attribute	corrected_cca_mass_initial_grams	units	String	grams
variable	amount_grams_consumed		float
attribute	amount_grams_consumed	_FillValue	float	NaN
attribute	amount_grams_consumed	actual_range	float	-0.031, 1.466
attribute	amount_grams_consumed	bcodmo_name	String	mass
attribute	amount_grams_consumed	description	String	amount of coralline algae consumed: corrected_cca_mass_initial_grams minus cca_mass_final_grams
attribute	amount_grams_consumed	long_name	String	Amount Grams Consumed
attribute	amount_grams_consumed	units	String	grams
variable	amount_mg_consumed		float
attribute	amount_mg_consumed	_FillValue	float	NaN
attribute	amount_mg_consumed	actual_range	float	-31.072, 1465.543
attribute	amount_mg_consumed	bcodmo_name	String	mass
attribute	amount_mg_consumed	description	String	amount of coralline algae consumed
attribute	amount_mg_consumed	long_name	String	Amount Mg Consumed
attribute	amount_mg_consumed	units	String	millimeters
variable	amount_mg_consumed_day		float
attribute	amount_mg_consumed_day	_FillValue	float	NaN
attribute	amount_mg_consumed_day	actual_range	float	-3.046, 143.681
attribute	amount_mg_consumed_day	bcodmo_name	String	unknown
attribute	amount_mg_consumed_day	description	String	rate of algal consumption (per day)
attribute	amount_mg_consumed_day	long_name	String	Amount Mg Consumed Day
attribute	amount_mg_consumed_day	units	String	millimeters
variable	amount_mg_consumed_d_gram_urchin		float
attribute	amount_mg_consumed_d_gram_urchin	_FillValue	float	NaN
attribute	amount_mg_consumed_d_gram_urchin	actual_range	float	-1.965, 20.483
attribute	amount_mg_consumed_d_gram_urchin	bcodmo_name	String	unknown
attribute	amount_mg_consumed_d_gram_urchin	description	String	rate of algal consumption (per day): standardized by the biomass of the individual sea urchin
attribute	amount_mg_consumed_d_gram_urchin	long_name	String	Amount Mg Consumed D Gram Urchin
attribute	amount_mg_consumed_d_gram_urchin	units	String	millimeters
variable	max_depth_grazed_mm		double
attribute	max_depth_grazed_mm	_FillValue	double	NaN
attribute	max_depth_grazed_mm	actual_range	double	0.013, 0.2
attribute	max_depth_grazed_mm	bcodmo_name	String	depth
attribute	max_depth_grazed_mm	description	String	maximum depth of sea urchin grazing scar on the coralline alga
attribute	max_depth_grazed_mm	long_name	String	Max Depth Grazed Mm
attribute	max_depth_grazed_mm	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	max_depth_grazed_mm	units	String	millimeters

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.