Dataset: Permanent plot seed counts

Name: Seed counts from a survey of the shallow and deep zones at four different sites in Massachusetts, USA in 2019
Published: 2021-03-31
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.847088.1

Spatial Extent: N:42.59711 E:-70.65592 S:42.42009 W:-70.9155

Temporal Extent: 2019-08 - 2019-08

Project:

RUI: Collaborative Research: Trait differentiation and local adaptation to depth within meadows of the foundation seagrass Zostera marina (ZosMarLA)

Principal Investigator:

A. Randall Hughes (Northeastern University)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-03-31

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Seed counts from a survey of the shallow and deep zones at four different sites in Massachusetts, USA in 2019

Abstract:

This dataset includes seed counts from a survey of the shallow and deep zones at four different sites in Massachusetts, USA in 2019. The four sites were West Beach in Beverly (N 42.55921, W 70.80578), Curlew Beach in Nahant (N 42.42009, W 70.91553), Lynch Park in Beverly (N 42.42009, W 70.91553), and Niles Beach in Gloucester (N 42.59711, W 70.65592).

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2021-03-31	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.847088.1	2021-04-01

Methods & Sampling

We conducted surveys of four different eelgrass beds in Massachusetts in mid-August of 2019. The four sites were West Beach in Beverly (N 42.55921, W 70.80578), Curlew Beach in Nahant (N 42.42009, W 70.91553), Lynch Park in Beverly (N 42.42009, W 70.91553), and Niles Beach in Gloucester (N 42.59711, W 70.65592). Surveys were done in both the shallow and deep zone. These zones were defined as being along the respective edges of the eelgrass beds. The exact depths of the zones varied from bed to bed.

During the surveys, we collected flowering shoots from within 0.25 m^2 quadrats every 2 m along a 30 m transect (that would be extended for each quadrat that had no eelgrass). Any flowering shoots found within the quadrats were taken and their seeds counted. This led to there being up to 25 flowering shoots per depth per site.

Data Processing Description

Data Processing:
We analyzed the number of seeds per flowering shoot at all four sites using a GLM with a negative binomial regression and independent and interactive effects of depth and site.

Statistical analyses were conducted using R Statistical Software v. 3.6.0 (R Core Team 2019). Negative binomial regression was done using the glm.nb function in the MASS package (Venables and Ripley 2002). We used a significance level of α = 0.05 for all of our analyses.

BCO-DMO Processing:
- renamed fields to conform with BCO-DMO naming conventions.

Data Files

File
seed_counts.csv (Comma Separated Values (.csv), 2.45 KB) MD5:0b6af764e1eb2bae8e789876daa674f1 Primary data file for dataset ID 847088

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1851043

Deployments

None available yet

Instruments

None available yet

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Seed_Count	The number of mature seeds per flowering shoot.	Number of seeds per flowering shoot	count
ID	A unique identification number given to each flowering shoot for which seeds were counted.	unitless	sample
Site	The location of sample collection. DC (Curlew Beach), WB (West Beach), NB (Niles Beach), or LP (Lynch Park).	unitless	site
Depth	SH (shallow zone) or DP (deep zone).	unitless	site_descrip

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Database

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Dataset: Permanent plot seed counts