Dataset: Scallop Density Survey - Trap CPUE

Name: Data from minnow traps placed across landscape fragmentation per se treatments in June, July, and August 2019 in Back Sound, NC to accompany scallop density surveys
Published: 2024-10-11
Keywords: artificial seagrass, fragmentation per se, patchiness, bay scallops, density, landscape scale, patch scale, CPUE, predators, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.939592.1

Spatial Extent: N:34.706 E:-76.588 S:34.7 W:-76.604

Oscar Shoal in Back Sound, NC, USA

Temporal Extent: 2019-06 - 2019-08

Project:

Collaborative Research: Habitat fragmentation effects on fish diversity at landscape scales: experimental tests of multiple mechanisms (Habitat Fragmentation)

Co-Principal Investigator:

F. Joel Fodrie (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Scientist:

Amy Yarnall (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Contact:

F. Joel Fodrie (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Amy Yarnall (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-10-11

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data from minnow traps placed across landscape fragmentation per se treatments in June, July, and August 2019 in Back Sound, NC to accompany scallop density surveys

Abstract:

This dataset contains data from minnow traps placed across landscape fragmentation per se treatments in June, July, and August 2019 to accompany scallop density surveys. These data were collected as part of the following study published in Yarnall et al. (2024): To explore the independent influence of fragmentation per se (patchiness) on mobile juvenile bay scallop (Argopecten irradians) density, we constructed 16 artificial seagrass unit (ASU) landscapes, consisting of four replicates each of four treatments. Fragmentation per se treatments consisted of three levels of patchiness while maintaining consistent total ASU area. We also examined the effect of patch-scale position on scallop densities. To examine the relationship of potential scallop predator community density on scallop density, we deployed four baited minnow traps to accompany each density survey. Data were collected by Drs. F. Joel Fodrie and Amy H. Yarnall for the Estuarine Ecology Laboratory of the University of North Carolina at Chapel Hill’s Institute of Marine Sciences.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2024-10-11	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.939592.1	2024-10-11

Description

CPUE = Catch Per Unit Effort
ASU = artificial seagrass unit

Methods & Sampling

To explore the independent influence of fragmentation per se (patchiness) on mobile juvenile bay scallop (Argopecten irradians) density, we constructed 16 artificial seagrass unit (ASU) landscapes (12-m x 10-m), consisting of four replicates each of four treatments. Fragmentation per se treatments consisted of three levels of patchiness (i.e., 1 patch, 12 patches, 24 patches) while maintaining consistent total ASU area (48 ASUs, 50 m² artificial seagrass). Between treatments of 12 and 24 patches, differences in configuration could be achieved by either varying interpatch distances or total footprint area. Therefore, we used two 12-patch treatments to consider these covariates separately, as indicated by footprint sizes (i.e., 12 patches-small versus 12 patches-large). We also examined the effect of patch-scale position on scallop densities. Relative 'inner' and 'outer' positions were operationally defined for 1-patch and multi-patch landscapes, separately. Within 1-patch landscapes, ASUs that bordered sandflat were considered 'outer' positions, while 'inner' positions were defined by ASUs that only bordered other ASUs. Within multi-patch landscapes, 'outer' positions were patches that had no additional patches between them and the landscape footprint border. 'Inner' position patches were centrally located patches in the landscape.

To examine the influence of potential scallop predator community structure on scallop responses, we deployed Gee-style minnow traps (41-cm x 22-cm cylinders, 0.3-cm galvanized wire-mesh, with 4-cm dia. funneled openings) baited with ~8 pieces of dry dog food within landscapes to accompany each density survey. Four traps were deployed in each landscape 24 h prior to scallop placement, to not disturb mobile scallops. Two traps were haphazardly placed in inner and outer patch-scale positions and collected after 24 h. All caught fauna were identified to the species level, enumerated, and released.

Depth note: Depth ranges were similar across all sites as they were located on a single shoal (Oscar Shoal in Back Sound, NC, USA). Depths typically ranged from <0.5 m (at low tide) to 1.5-2 m (at high tide).

Organism identifiers (common name, scientific name, LSID):
bay scallop, Argopecten irradians, urn:lsid:marinespecies.org:taxname:156817
eelgrass, Zostera marina, urn:lsid:marinespecies.org:taxname:495077
* see Supplemental File "Species List" for additional taxonomic information to accompany the trap data.

Problems/Issues

Note: Duplicate rows in this dataset are intentionally included and are from separate individuals of the same species and length caught in the same trap.

Data Processing Description

All data were entered electronically into an Excel spreadsheet.

BCO-DMO Processing

* Sheet "Data" of submitted file "Scallop_Predators_Minnow_Traps_2019.xlsx" was imported into the BCO-DMO data system for this dataset. Values "NA" imported as missing data values.
** In the BCO-DMO data system missing data identifiers are displayed according to the format of data you access. For example, in csv files it will be blank (null) values. In Matlab .mat files it will be NaN values. When viewing data online at BCO-DMO, the missing value will be shown as blank (null) values.

* Column names adjusted to conform to BCO-DMO naming conventions designed to support broad re-use by a variety of research tools and scripting languages. [Only numbers, letters, and underscores. Can not start with a number]

* DateTime with time zone column added "ISO_DateTime_UTC_In." Converted from Date_In and Time_In (from local EST/EDT to UTC) converted to ISO 8601 format.

* Species List added as a supplemental file. Contains match information for taxonomic names used in the dataset to names at the World Register of Marine Species (WoRMS) using the WoRMS taxa match tool (https://www.marinespecies.org/aphia.php?p=match). Match performed on 2024-10-08.

* Submitter revised and resubmitted table with file "939592_v1_scallop-density-assay-trap-cpue_revised.csv" which corrects species names. BCO-DMO data manager made one additional correction Lagadon rhomboides -> Lagodon rhomboides and Sarsema spp. -> Sesarma spp. revised file was imported into the BCO-DMO data system and provided as the primary data table for version 1 of this dataset (939592_v1_scallop-density-assay-trap-cpue.csv).

* Submitter revised and resubmitted table with file "939592_v1_scallop-density-assay-trap-cpue_revised2.csv" which corrects species names and resolves a conflict between revised file was imported into the BCO-DMO data system and provided as the primary data table for version 1 of this dataset (939592_v1_scallop-density-assay-trap-cpue.csv).

* Submitter revised and resubmitted table with file "939592_v1_scallop-density-assay-trap-cpue_revised3.csv" which corrects species names and resolves a conflict between revised file was imported into the BCO-DMO data system and provided as the primary data table for version 1 of this dataset (939592_v1_scallop-density-assay-trap-cpue.csv). This revision resolved conflicting common and species names (Blue crab,Lagodon rhomboides) issue.

* Names checked again and species list supplemental file updated (name match performed on 2024-10-11).

Data Files

File
939592_v1_scallop-density-assay-trap-cpue.csv (Comma Separated Values (.csv), 219.95 KB) MD5:5157df938fd4331d4ebc08e1a06f284c Primary data file for dataset ID 939592, version 1

Supplemental Files

File

Species List
filename: 939592_species_list.csv

(Comma Separated Values (.csv), 4.89 KB)
MD5:b8c7913e1ed9f1b73db297d85408f8cb

Unique list of organism taxonomic names used in this dataset matched to taxonomic identifiers. Includes quality information about the match.

Columns:
dataset_Sp_name, Common name as it appears in the dataset column "Sp_name"
dataset_Sci_name, taxonomic name (verbatim) as it appears in the dataset column "Sci_name"
ScientificName_WoRMS, name matched to at the World Register of Marine Species (WoRMs)
LSID, Life Science Identifier (LSID) for the ScientificName_WoRMS
AphiaID, AphiaID (taxonomic identifier) for the ScientificName_WoRMS 
Match type, An indication of how closely the dataset Sp_name matches the WoRMS name
Taxon_status, An indication of whether the matched names at WoRMS is the currently accepted name for the organism or is an unaccepted synonym (at the time of the match 2024-10-11)

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1635950

Deployments

None available yet

Instruments

minnow trap

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: minnow trap

Generic Description:

shore fishing gear

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Site_ID	Artificial seagrass unit (ASU) landscape name (Number of patches, footprint size, replicate letter)	unitless	site
Landscape	Landscape configuration type (Number of patches, footprint size)	unitless	site_descrip
Num_patches	Number of patches in landscape configuration (1, 12, 24)	integer	site_descrip
Footprint	Landscape footprint size (contiguous, small, large)	unitless	site_descrip
Rep_letter	Landscape configuration letter (a-e)	unitless	site_descrip
lat	Landscape latitude north	decimal degrees	lat
lon	Landscape longitude west	decimal degrees	lon
Month	Month of minnow trap deployment	unitless	month
Date_In	Date of minnow trap deployment (local time zone EST/EDT) Format: %Y-%m-%d	unitless	date_local
Time_In	Time of minnow trap deployment (local time zone EST/EDT) Format: %H:%M	unitless	time_local
ISO_DateTime_UTC_In	DateTime with timezone of minnow trap deployment (ISO 8601 format in timezone UTC) Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Date_Out	Date of minnow trap retrieval Format: %Y-%m-%d	unitless	date_local
Time_Out	Time of minnow trap retrieval Format: %H:%M	unitless	time_local
H_tide	Time of high tide proximate to minnow trap Time_Out (local time zone EST/EDT) Format: %H:%M	unitless	time_local
L_tide	Time of low tide proximate to minnow trap Time_Out (local time zone EST/EDT) Format: %H:%M	unitless	time_local
WaterTemp_C	Surface water temperature at time of minnow trap deployment	degrees C	temp
Sal_PSU	Surface salinity at time of minnow trap deployment	PSU	sal
Trap_num	Trap number (1-4) deployed with landscape on Date_In	integer	sample_descrip
Position	Patch-scale position (Inner, Outer)	unitless	sample_descrip
Sp_name	Common name of fauna species	unitless	common_name
Sci_name	Scientific name of fauna species	unitless	verbatimIdentification
Length_mm	Total length of fauna	millimeters (mm)	length
Notes	Notes about fauna or trap	unitless	comment

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Dataset: Scallop Density Survey - Trap CPUE