﻿This c-n-readme.txt file was generated on 2026-03-24 by Roel Lammerant


DATA-SPECIFIC INFORMATION FOR: c-n.csv

## Data processed by Roel Lammerant and Jenna Hölttä, Tvärminne Zoological Station, Finland - in collaboration with Janina Pykäri, Nishant Nishant, Anna Villnäs, Sofia Wikström, Alf Norkko & Camilla Gustafsson.
## Correspondence concerning these data should be directed to Roel Lammerant (Roel.lammerant@outlook.be).

## Description: 
Spatial field survey in August 2023, where macrophyte material was destructively harvested at 20 sites along a salinity and exposure gradient in the Pojo-Hanko archipelago, Finland.  
Elemental analyses were conducted on a subset of individuals, for up to four individuals of each species per site.
Dried tissue was homogenized using sterile stainless-steel beads and a ball mill (Retsch MM 400). 
Samples were micro-weighed by hand and analyzed using a Sercon Isotope Ratio Mass Spectrometer at Tvärminne Zoological Station.

Data file:

1. Number of variables: 
13

2. Number of cases/rows: 
762

3. Variable List: 
<list variable name(s), description(s), unit(s)and value labels as appropriate for each>
# position  - Sample position on the well plate
# abbr - Abbreviation for samples in the well plate with site, species and tissue information
# exposure - Exposure categories, consisting of Exposed, Semi, Sheltered and Pojo
# organism - Origin of macrophyte material (Algae or Plant)
# species - Abbreviations for the collected species: MYRSPI - Myriophyllum spicatum, CERDEM - Ceratophyllum demersum, POTPER - Potamogeton perfoliatus, RANBAU - Ranunculus baudotii, RANCIR - Ranunculus circinatus, RUPCIR - Ruppia cirrhosa, STUPEC - Stuckenia pectinata, ZANMAJ - Zannichellia major, ZOSMAR - Zostera Marina, NAJMAR - Najas marina, LEMTRI - Lemna trisulca, MYRSIB - Myriophyllum sibiricum, CALHER - Callitriche hermafroditica, POTNIT - Potamogeton nitens, NUPLUT - Nuphar lutea, Fontinalis - Fontinalis sp., POTOBT - Potamogeton obtusifolius, Sparganium - Sparganium sp. 
# tissue - Tissue used for elemental analyses: Leaf, Rhizome, Root
# dwt - Dry weight of the sample used for elemental analyses in mg
# Nmass - Amount of particulate organic nitrogen in µg
# 15N - Nitrogen stable isotope measurement
# Cmass - Amount of particulate organic carbon in µg
# 13C - Carbon stable isotope measurement
# Npercentage - The amount of particulate organic nitrogen per dry weight of the sampled tissue in µg/mg
# Cpercentage - The amount of particulate organic carbon per dry weight of the sampled tissue in µg/mg


4. Missing data codes: 
<list code/symbol and definition>
NA

5. Specialized formats or other abbreviations used: 
