Data Package Metadata View Summary

Intertidal Crab Data in Midcoast Maine: 2018-2024

General Information

Data Package:

Local Identifier:

edi.1189.6

Title:

Intertidal Crab Data in Midcoast Maine: 2018-2024

Alternate Identifier:

DOI PLACE HOLDER

Abstract:

Invasive species have caused major disruptions to ecosystems worldwide. The European green crab invaded North America in the 1800s and is considered one of the world’s 100 worst invaders by the IUCN. Observations of spatiotemporal green crab population dynamics are essential for predicting and managing the ecological and economic impacts of this harmful invasive species. These data come from a standardized method for assessing green crab population dynamics in the rocky intertidal zone of New England and Atlantic Canada. Data was collected from 10 survey sites located along the coast of Maine from Yarmouth, ME (furthest point south), to Walpole, ME (furthest site north) from January, 2018 to November, 2024. Data was collected following the survey design described in McMahan (2020), using a 1m^2 quadrat to sample rocky intertidal habitat. The resulting data collected using this protocol has a wide range of uses, including to inform ecological research, conservation efforts, mitigation strategies, and fishery development, as well as for educational outreach purposes.

Publication Date:

2024-12-12

For more information:
Visit:	https://doi.org/10.6073/pasta/6ce63c067471ce075992d0189c4cebb0
Visit:	DOI PLACE HOLDER

Time Period

Begin:

2018

End:

2024

People and Organizations
Contact:	McMahan, Marissa D (Manomet) [ email ]
Creator:	McMahan, Marissa D (Manomet)
Creator:	Batchelder, Jessica P (Manomet)
Associate:	Ferrelli, Erica (University of Southern Maine, Research Assistant)
Associate:	Carter, Eliza A (EDI Summer Fellow, Data Management)

Data Entities
Data Table Name:	Intertidal Crab Data
Description:	Intertidal crab observation and environmental data for Midcoast Maine from 2018 to 2024.

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/1189/6/14bb1fd5be33c4774885acfdabb2f68a
Name:	Intertidal Crab Data
Description:	Intertidal crab observation and environmental data for Midcoast Maine from 2018 to 2024.
Number of Records:	3908
Number of Columns:	24

Table Structure

Object Name:

Intertidal Crab Data_2024a.csv

Size:

413708 byte

Authentication:

1351870a096533e60eb2b49fd0da0b69 Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

site

lat

long

date

tide_height

tide_time

start_time

end_time

sunrise

sunset

lunar_phase

quad_number

rock

asco

species_presence

species

sex

claws

legs

condition

ovigerous

color

notes

Column Name:

site

lat

long

date

tide_height

tide_time

start_time

end_time

sunrise

sunset

lunar_phase

quad_number

rock

asco

species_presence

species

sex

claws

legs

condition

ovigerous

color

notes

Definition:

site name

latitude

longitude

date of data collection

height of low tide

time of low tide

time of arrival at study site

time of departure at study site

time of sunrise

time of sunset

percent of lunar illumination

quadrat sample number related to date and site

quadrat coverage of movable rock to the nearest 25%

quadrat coverage of Ascophyllum nodosum to the nearest 25%

presence/absence of any crab species

identified species code

species carapace width

species sex

number of claws (0-2)

number of legs (0-8)

molt status

egg presence on outside of female

only for species Cm, color is based on standard color scale

any notes from the survey

Storage Type:

string

float

dateTime

float

dateTime

float

string

float

string

float

string

float

string

Measurement Type:

nominal

ratio

dateTime

ratio

dateTime

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

Measurement Values Domain:

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	BR
Definition	Back River
Source

Code Definition

Code	DMC
Definition	Darling Marine Center
Source

Code Definition

Code	FI
Definition	Five Islands
Source

Code Definition

Code	HI
Definition	Hermit Island
Source

Code Definition

Code	KB
Definition	Kennebec
Source

Code Definition

Code	LC
Definition	Lowells Cove
Source

Code Definition

Code	NM
Definition	New Meadows
Source

Code Definition

Code	RH
Definition	Robinhood Cove
Source

Code Definition

Code	SP
Definition	Sandy Point
Source

Code Definition

Code	SPT
Definition	Southport
Source

Unit	decimalDegrees
Type	real

Unit	decimalDegrees
Type	real

Format	YYYY-MM-DD
Precision

Unit	foot
Type	real

Format	hh:mm
Precision

Format	hh:mm
Precision

Format	hh:mm
Precision

Format	hh:mm
Precision

Format	hh:mm
Precision

Unit	percent
Type	integer

Unit	number
Type	integer

Unit	percent
Type	real

Unit	percent
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	0
Definition	absent
Source

Code Definition

Code	1
Definition	present
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	Cb
Definition	Cancer borealis
Source

Code Definition

Code	Ci
Definition	Cancer irroratus
Source

Code Definition

Code	Cm
Definition	Carcinus maenas
Source

Code Definition

Code	Hs
Definition	Hemigrapsus sanguineus
Source

Unit	millimeter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	F
Definition	female
Source

Code Definition

Code	M
Definition	male
Source

Unit	number
Type	real

Unit	number
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	H
Definition	hard
Source

Code Definition

Code	P
Definition	premolt (only for species Cm)
Source

Code Definition

Code	S
Definition	soft
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	N
Definition	no
Source

Code Definition

Code	Y
Definition	yes
Source

Unit	number
Type	real

Definition

text

Missing Value Code:

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Code	NA
Expl	not available

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
(No thesaurus)	Intertidal Crab Monitoring, green crab, Carcinus maenas
LTER Controlled Vocabulary	intertidal, monitoring, crustaceans, invasive species, marine, long term, conservation

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Crab surveys were conducted following the protocol developed by McMahan (2020). Surveys took place in the lower third of the intertidal zone, during negative or zero tides. Most surveys occurred between May and November during the height of productivity in the intertidal zone. From 2018-2021, surveys were conducted monthly from May through November, as effort allowed. Beginning in 2022, surveys were conducted three times on a seasonal basis: spring (April or May), summer (July or August), and fall (October or November). All surveys sites were wave-sheltered rocky intertidal areas with cobble (i.e., not stable, rolled by wave action) and algal canopy habitat with at least 100 m of shoreline to accommodate the sampling. At each site, the same 100 m section was surveyed on every sampling trip; these areas were delineated by permanent landmarks. Surveys were conducted by haphazardly tossing a 1 m2 quadrat within the predefined low intertidal zone area running parallel to the shoreline. A visual estimate of the percent of both moveable rock (i.e., cobble/gravel that you can look underneath) and algae canopy cover (e.g. Ascophyllum or Fucus spp.) within the quadrat to the nearest quarter percent (i.e., 0, 25, 50, 75, or 100%) was made. As the rocky intertidal habitat is often patchy and can contain areas of sand, mud, ledge, or other habitats where green crabs are not found, only quadrats with greater than 50% movable rock, or greater than 50% algal canopy were surveyed. Within each quadrat, rocks and cobble were lifted, and algae was moved aside to look for crabs. Data recorded for each crab included species identification, carapace width (widest part of the carapace, spanning from tip to tip of the terminal spines) measured to the nearest 1 mm, sex, number of claws, number of legs, shell condition (i.e., hard- or soft-shell as determined by whether the carapace resists (hard) or gives (soft) when finger pressure is applied), and the presence (i.e., ovigerous) or absence of extruded eggs for females. For green crabs only, shell condition was also identified if pre-molt, as the timing of the green crab molt cycles are of particular interest to the emerging soft-shell green crab fishery. Color was also recorded for green crabs using the protocol developed by Young and Elliot (2017). All crabs were returned to the habitat and any cobble or algae that was moved was replaced.

Description:

Bibliography

McMahan 2020 Green Crab Protocol:

McMahan, M. D. (2020). Assessing Intertidal Populations of the Invasive European Green Crab. JoVE (Journal of Visualized Experiments), 163, e61667. https://doi.org/10.3791/61667

Green Crab Color Chart:

Young, A. M., Elliott, J. A., Incatasciato, J. M., & Taylor, M. L. (2017). Seasonal catch, size, color, and assessment of trapping variables for the European green crab Carcinus maenas (Linnaeus, 1758) (Brachyura: Portunoidea: Carcinidae), a nonindigenous species in Massachusetts, USA. Journal of Crustacean Biology, 37(5), 556–570. https://doi.org/10.1093/jcbiol/rux068

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@edirepository.org

Web Address:

https://edirepository.org

Id:

https://ror.org/0330j0z60

Creators:

Individual:

Marissa D McMahan

Organization:

Manomet

Email Address:

mmcmahan@manomet.org

Individual:

Jessica P Batchelder

Organization:

Manomet

Email Address:

jbatchelder@manomet.org

Contacts:

Individual:

Marissa D McMahan

Organization:

Manomet

Email Address:

mcmahan@manomet.org

Associated Parties:

Individual:

Erica Ferrelli

Organization:

University of Southern Maine

Email Address:

erica.ferrelli@maine.edu

Role:

Research Assistant

Individual:

Eliza A Carter

Position:

EDI Summer Fellow

Email Address:

eliza.carter@duke.edu

Role:

Data Management

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

2018

End:

2024

Geographic Region:

Description:

All surveys were conducted at sites along the Maine coast, the southernmost site in Yarmouth, ME, and the northernmost (easternmost) site in Walpole, ME. This bounding box includes the entire coast segment for all sites surveyed.

Bounding Coordinates:

Northern:	43.9363	Southern:	43.728611
Western:	-70.149314	Eastern:	-69.5813

Project

Parent Project Information:

Title:

Intertidal Crab Monitoring

Personnel:

Individual:

Marissa D McMahan

Organization:

Manomet

Email Address:

mmcmahan@manomet.org

Role:

Principal Investigator

Additional Award Information:

Funder:	National Oceanic and Atmospheric Administration
Number:	NA18NMF4270194
Title:	Saltonstall-Kennedy Grant

Additional Award Information:

Funder:	Robert and Patricia Switzer Foundation
Number:	LGP 17-01
Title:	Leadership Grant

Maintenance

Maintenance:

Description:	Ongoing data collection
Frequency:	annually

Other Metadata

Additional Metadata

additionalMetadata
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        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'fetchedFromEDI'
        |     |        \___attribute 'dateFetched' = '2024-12-12'
        |     |        \___attribute 'packageID' = 'edi.1189.3'
        |     |___text '\n      '
        |___text '\n   '

Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'importedFromXML'
        |     |        \___attribute 'dateImported' = '2024-12-12'
        |     |        \___attribute 'filename' = 'edi.1189.3.xml'
        |     |        \___attribute 'taxonomicCoverageExempt' = 'True'
        |     |___text '\n      '
        |___text '\n   '

Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'unitList' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unitList')
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'decimalDegrees'
        |     |     |     |  \___attribute 'name' = 'decimalDegrees'
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Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'emlEditor'
        |     |        \___attribute 'app' = 'ezEML'
        |     |        \___attribute 'release' = '2024.10.30'
        |     |___text '\n      '
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Copyright 2024 Environmental Data Initiative. This material is based upon work supported by the National Science Foundation under grants #2223103 and #2223104. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Please contact us with questions, comments, or for technical assistance regarding this web site or the Environmental Data Initiative. Please read our privacy policy to know what information we collect about you and to understand your privacy rights.

EDI is a collaboration between the University of New Mexico and the University of Wisconsin – Madison, Center for Limnology:

Data Package Metadata View Summary

Intertidal Crab Data in Midcoast Maine: 2018-2024

Data Entities

Data Table

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Additional Metadata

Additional Metadata

Additional Metadata

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Intertidal Crab Data in Midcoast Maine: 2018-2024

+/- Data Entities

Data Table

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

+/- Additional Metadata

+/- Additional Metadata

+/- Additional Metadata

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Metadata

Additional Metadata

Additional Metadata

Additional Metadata