Data from: Seagrasses in coastal wetlands of the Algarve region (southern Portugal): past and present distribution and extent

These datasets support the scientific article "Seagrasses in coastal wetlands of the Algarve region (southern Portugal): past and present distribution and area extent" (submitted). It contains detailed data on the distribution and area extent of intertidal and subtidal seagrass meadows in the four main wetlands of the Algarve region (Southern Portugal): Ria de Alvor, Arade Estuary, Ria Formosa, Guadiana Estuary.

The data is composed by 5 datasets with the following variables:

1) data_field_points.csv

Contains data points based on field surveys.

dataset_id [character] - Unique identifier for the data set.

data_id [character] - Unique identifier for the data point.

wetland [character] - Wetland full name, in Portuguese: Ria de Alvor, Estuário do Arade, Ria Formosa, Estuário do Guadiana.

wetland_slug [character] - Short name of the wetland for coding purposes: alvor, arade, riaformosa, guadiana.

quadrat_id [character] - Name of the quadrat as recorded in the field.

photo_id [character] - Name of the pictured associated to the observation.

sampling_id - Name of the observation as recorded in the field.

date [date] - Date of observation (YYYY-MM-DD).

year [integer] - Year of sample collection (YYYY).

month [integer] - Month of sample collection (MM).

latitude [numeric] - The geographic latitude (in decimal degrees, WGS84) of data point.

longitude [numeric] - The geographic longitude (in decimal degrees, WGS84) of data point.

habitat_class [factor] - Type of habitat: unvegetated, seagrass intertidal, seagrass subtidal, seagrass unknown, salt marsh low, caulerpa.

species [factor] - Vegetation species: No vegetation, Zostera noltei, Zostera marina, Cymodocea nodosa, unspecified species, Caulerpa prolifera, Sporobolus maritimus.

notes [character] - Any relevant notes on the data compilation.

method [factor] - Method used for the observation: boat and camera, boat and snorkelling, kayak and camera, on foot.

survey_area [character] - Number of the survey area.

site [character] - Name of the site.

observers [character] - Name of the researcher(s) who collected the data.

2) data_compilation_records.csv

Contains information on the records (i.e. sources) screened during the systematic review for the compilation od seagrass occurrence data.

record_id [character] - unique id for the compiled records.

short_citation [character] - short citation of the record, with author and publication year.

included [boolean] - whereas the record was used to extract data or informacion.

record_type [factor] - type of record: journal article, book or book chapter, PhD or MSc thesis, report, others.

publication_year [integer] - year of the publication of the record, YYYY.

title_record [character] - title of the record.

link [character] - link to access the record, if available (DOI, handle, others URLs).

full_citation [character] - full citation of the record, with authors, publication year, title, etc.

3) data_compilation_points_raw.csv

Contains data points of seagrass occurrence based on the systematic review. This is the original raw file with all the compiled points.

data_id [character] - Unique identifier for the data point (same as used in data_compilation_clean.csv).

included [boolean] - whether the data point was kept in the clean dataset or not: 1, the point has been validated and it is included in the final dataset; 0, the point is excluded due to unprecise location (on land, open ocean, etc.).

reason_exclusion [character] - Reason to exclude the data point from the clean dataset.

record_id [character] - unique id for the compiled record from where data was extracted (same as in data_compilation_records.csv).

short_citation [character] - Short reference (author(s) and year) (same as in data_compilation_records.csv).

wetland [character] - Wetland full name, in Portuguese: Ria de Alvor, Estuário do Arade, Ria Formosa, Estuário do Guadiana.

wetland_slug [character] - Short name of the wetland for coding purposes: alvor, arade, riaformosa, guadiana.

latitude [numeric] - The geographic latitude (in decimal degrees, WGS84) of data point.

longitude [numeric] - The geographic longitude (in decimal degrees, WGS84) of data point.

year [integer] - Year of sample collection (YYYY).

month [integer] - Month of sample collection (MM).

year_precision [character] - Precision of the year registred: exact, after, before, or aproximately.

habitat_class [factor] - Type of seagrass habitat: seagrass intertidal, seagrass subtidal, or seagrass unknown.

species [factor] - Dominant seagrass species: Zostera noltei, Zostera marina, Cymodocea nodosa, unspecified.

collection_code [character] - The name identifying the data set or collection from which the record was derived.

catalogue_number [character] - An identifier for the record within the data set or collection.

original_id [character] - An identifier given to the occurrence at the time it was recorded (specimen collector's number or site collection).

duplicated [boolean] - whether the data point was flagged as duplicated or not.

4) data_compilation_points_clean.csv

Contains data points of seagrass occurrence based on the systematic review. This is the clean file after elimitating duplicates and points with unprobable or unprecise location.

data_id [character] - Unique identifier for the data point (same as used in data_compilation_raw.csv).

record_id [character] - unique id for the compiled record from where data was extracted (same as in data_compilation_records.csv).

short_citation [character] - Short reference (author(s) and year) (same as in data_compilation_records.csv).

wetland [character] - Wetland full name, in Portuguese: Ria de Alvor, Estuário do Arade, Ria Formosa, Estuário do Guadiana.

wetland_slug [character] - Short name of the wetland for coding purposes: alvor, arade, riaformosa, guadiana.

latitude [numeric] - The geographic latitude (in decimal degrees, WGS84) of data point.

longitude [numeric] - The geographic longitude (in decimal degrees, WGS84) of data point.

year [integer] - Year of sample collection (YYYY).

month [integer] - Month of sample collection (MM).

year_precision [character] - Precision of the year registred: exact, after, before, or aproximately.

habitat_class [factor] - Type of seagrass habitat: seagrass intertidal, seagrass subtidal, or seagrass unknown.

species [factor] - Dominant seagrass species: Zostera noltei, Zostera marina, Cymodocea nodosa, unspecified.

collection_code [character] - The name identifying the data set or collection from which the record was derived.

catalogue_number [character] - An identifier for the record within the data set or collection.

original_id [character] - An identifier given to the occurrence at the time it was recorded (specimen collector's number or site collection).

5) data_compilation_extent.csv

Contains area extent data of seagrass meadows based on the systematic review.

data_id [character] - Unique identifier for the data.

record_id [character] - unique id for the compiled record from where data was extracted.

short_citation [character] - Short reference (author(s) and year).

wetland [character] - Wetland full name, in Portuguese: Ria de Alvor, Estuário do Arade, Ria Formosa, Estuário do Guadiana.

wetland_slug [character] - Short name of the wetland for coding purposes: alvor, arade, riaformosa, guadiana.

value [boolean] -  whether the data extracted from the record is a extent value (i.e., a value of area covered by seagrasses).

polygon [boolean] -  whether the data extracted from the record is a polygon.

year [integer] - Year of sample collection (YYYY).

month [integer] - Month of sample collection (MM).

year_precision [character] - Precision of the year registred: exact, after, before, or aproximately.

habitat_class [factor] - Type of seagrass habitat: seagrass intertidal, seagrass subtidal, or seagrass unknown.

species [factor] - Dominant seagrass species: Zostera noltei, Zostera marina, Cymodocea nodosa, unspecified.

area_source [numeric] - The area extent given in the record.

area_source_cover [factor] - The cover of the wetland for the compiled extent from the record means: total, partial or unknown.

area_gis  [numeric] - The area extent obtained using GIS.

area_gis_cover [factor] - The cover of the wetland for the obtained extent from GIS means: total, partial or unknown.

notes [character] - Any relevant notes on the data compilation.