Dataset: Vegetative Shoot Heights

Name: Vegetative shoot heights of Zostera marina determined from from weekly-biweekly surveys in shallow and deep zones at two sites in Massachusetts, USA in 2019
Published: 2021-03-31
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.847101.1

Spatial Extent: N:42.55921 E:-70.80578 S:42.42009 W:-70.91553

Temporal Extent: 2019-06-04 - 2019-08-27

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

Vegetative shoot heights of Zostera marina determined from from weekly-biweekly surveys in shallow and deep zones at two sites in Massachusetts, USA in 2019

Abstract:

This dataset includes vegetative shoot heights of Zostera marina determined from from weekly-biweekly surveys in shallow and deep zones at two sites in Massachusetts, USA in 2019. Eleven surveys of two different eelgrass beds were conducted every 1-2 weeks starting June 4th and ending August 27th during the summer of 2019. The two sites were West Beach in Beverly (N 42.55921, W 70.80578) and Curlew Beach in Nahant (N 42.42009, W 70.91553).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-03-31	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.847101.1	2021-04-01

Methods & Sampling

We conducted eleven surveys of two different eelgrass beds in Massachusetts every 1-2 weeks starting June 4th and ending August 27th during the summer of 2019. The two sites were West Beach in Beverly (N 42.55921, W 70.80578) and Curlew Beach in Nahant (N 42.42009, W 70.91553). Each survey consisted of a 20 m transect being laid out parallel to shore 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 each survey, we measured the height of up to 5 vegetative shoots per quadrat to the nearest half cm.

Data Processing Description

Data Processing:
We examined vegetative shoot height using a linear mixed effects models with site, depth, and time (week) as fixed factors and unique quadrat as a random effect to account for non-independence of measurements within the same quadrat. The model included all possible interactions.

Statistical analyses were conducted using R Statistical Software v. 3.6.0 (R Core Team 2019). Mixed linear models were done using the lme4 and lmerTest packages (Bates et al. 2015; Kuznetsova et al. 2017). We used a significance level of α = 0.05 for all of our analyses.

BCO-DMO Processing:
- changed date format to YYYY-MM-DD;
- renamed fields to conform with BCO-DMO naming conventions.

Data Files

File
veg_shoot_height.csv (Comma Separated Values (.csv), 73.80 KB) MD5:177a8cc3d71341942a7f65d947a5411b Primary data file for dataset ID 847101

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
Date	The date of sample collection; format: YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Week	The assigned collection week number. Numbers start at 1 for the first week of collection and go up 1 each collection week.	unitless	time_point
Site	The site of collection. Either West (West Beach, Beverly, MA) or Dorothy (Curlew Beach, Nahant, MA)	unitless	site
Depth	SH (shallow zone) or DP (deep zone)	unitless	site_descrip
Quadrat	For each transect, quadrats will be in order with 1 being the first quadrat of each transect at 2m and 10 being the last at 20m. Some weeks go higher than 10 quadrats if we sampled more or had empty quadrats. Week 4 quadrat numbers do not correspond to transect position/sampling order.	unitless	site
Height	The height of the vegetative shoot in question; measured to the nearest half centimeter. A maximum of 5 heights of randomly selected vegetative shoots were taken per quadrat.	centimters (cm)	height
Unique_Quadrat	A unique number assigned to each quadrat.	unitless	sample_descrip

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Dataset: Vegetative Shoot Heights