Dataset: Percent cover of macroalgae at Cabritte Horn

Name: Abundance and percent cover of macroalgae at Cabritte Horn (St.John, US Virgin Islands) from 1992-2020
Published: 2022-06-10
Keywords: coral reef, US Virgin Islands, macroalgae, benthic cover, biota, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.875543.1

Spatial Extent: N:18.3075 E:-64.7219 S:18.3075 W:-64.7219

Temporal Extent: 1992-05-30 - 2020-08-06

Project:

RUI: Pattern and process in four decades of change on Caribbean reefs (St John Coral Reefs)

Principal Investigator:

Peter J. Edmunds (California State University Northridge, CSUN)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-06-10

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Abundance and percent cover of macroalgae at Cabritte Horn (St.John, US Virgin Islands) from 1992-2020

Abstract:

These data describe the abundance of macroalgae in quadrats at Cabritte Horn in St. John from 1992-2020. The percent cover for macroalgae is used to test for an association with Millepora abundance.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2022-06-10	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.875543.1	2022-06-16

Methods & Sampling

Abundance of macroalgae was examined by measuring percent cover at Cabritte Horn on the south shore of St. John, US Virgin Islands across three decades. Photographic sampling of quadrats was performed annually from 1992 to 2020 using cameras mounted on a framer at a fixed height above the reef. Color slide film was used from 1992–2000 (and digitized at 4000 dpi), with digital photography implemented in 2001. Photoquadrats were recorded at random positions along the transect, which was 20 meters long from 1992–1999 and 40 meters long from 2000 onward when the sample size was increased to ~40 photoquadrats per year.

For details on association with Millepora spp., see Related Datasets section below. To access images, see Related Publications section below for link to Coral Image Downloads and Viewer (Cabritte Horn images under "Random Sites")

Data Processing Description

The photoquadrats were used to determine the percentage cover of benthic space holders using CoralNet software (Williams et al, 2019; Chen et al, 2021) with 200 random points on each image that were manually annotated. All aspects of the benthic community were quantified, but here only the cover of macroalgae is reported.

Statistical analyses
Macroalgal cover (arcsine transformed), the morphology of Millepora sp. (log transformed), and temperature were compared among years using one way ANOVAs with Bonferonni post hoc analyses to compare between years (using Systat 13 software).

BCO-DMO processing
- added columns for latitude and longitude
- converted Date to YMD format
- added columns for location and camera type
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions

Data Files

File
macroalgal_cover.csv (Comma Separated Values (.csv), 100.69 KB) MD5:0ad6f40588bc6d570a81db41b1146a6f Primary data file for dataset ID 875543

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2019992

Deployments

None available yet

Instruments

Camera

Supplied Name: Nikonos V film camera

Supplied Description:

A Nikonos V film camera with 28 mm lens was used in the years 1992-2000

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

Camera

Supplied Name: Nikon Coolpix 990

Supplied Description:

A Nikon Coolpix 990 digital camera with 8-24 mm lens was used in the years 2001-2005

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

Camera

Supplied Name: Nikon DSLR digital camera

Supplied Description:

A Nikon DSLR D70/DX digital camera with 18-70 mm lens was used in the years 2006-2010
A Nikon DSLR D90/DX digital camera with 18-70 mm lens was used in the year 2011
A Nikon DSLR D7000/DX digital camera with 18-70 mm lens was used in the years 2012-2015
A Nikon DSLR D810/FX digital camera with 18-35 mm lens was used in the years 2016-2021

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Latitude	Latitude	decimal degrees	lat
Longitude	Longitude	decimal degrees	lon
Sampling_Date	Date of photographic quadrat sampling Format: %Y-%m-%d	unitless	date
Quadrat_number	Quadrat number	unitless	sample
Percent_cover_macroalgae	Percentage cover of macroalgae	percent (%)	percent_cover
Location	Geographical location	unitless	region
Camera	Type of camera and lens used for photographic quadrat sampling	unitless	inst_model

Database

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Dataset: Percent cover of macroalgae at Cabritte Horn