Long-term shifts in intertidal predator and prey communities in the Wadden Sea and consequences for food 
requirements and supply
Author: A.S. Jung (Sarina.Jung@gmx.de)
Contributors
Dekker, R. (Rob)
Germain, M. (Myriam)
Philippart, C.J.M. (Katja)
Witte, J.IJ. (Hans)
van der Veer H.W. (Henk)

This is a read me instruction for the above mentioned dataset uploaded to 4TU 

The uploaded files are a mix of data sheets in *.txt and *.csv format and R scripts (*.R). Additional there is a 
*.Rnw file that can be used to produce a PDF with the plots of the publication (Additional software for LaTeX compilation necessary).


Some headers are reoccurring throughout the files and mean the following:

Cruiseid: Individual ID for each sampling event consisting of the Year and a two digit running ID (e.g. 197503 is the third sampling event in 1975)
Species: Species are coded in numbers, a list of the full list of species and their corresponding number can be found in the file “Names.csv”
Age: Age class of the species runs from 0 to 2 (0-group=0, I-group=1, II-group=2), all species with no age distinction have age 0.
datum: sampling date in Year-Month-Day format 
TBioCrus: Total biomass per cruise in mg 1000 m-2 
NumStat: Numbers of stations sampled in that cruise, used to correct mean biomass and density
Length: Length in mm
LK: length class in 0.5 cm steps
TNum: total number uncorrected for length class sampling
LN: Total number of age classes sampled to correct total density
TNum1000m: Density in Ind. 1000 m-2 
Help: Artificial indicator to help identify data that has been stored as total numbers per cruise instead of per station
TNumCr: Total density uncorrected for number of stations sampled
TNumCrus: Density in Ind. 1000 m-2 per cruise
G-a, G-b: growth parameters from first estimate, only parameters for crustaceans get used
Q10, WW-AFDM, MaintC, AssiEff: Species specific coefficients used in calculations that are corresponding to Q10, wet-weight to ash-free-dry-mass conversion factor, maintenance coefficient and assimilation efficiency
a, b, ref: length-weight parameters (a and b) as well as an indicator as to how weight is calculated (ref), ref=1 -> (a*Length)^b; ref=5 -> a*L^b



List of files with Filename, Type, Description, and header (if applicable) in order, for description of headers see above:
Biomass
*.csv
File with total biomass of each species and age class in mg 1000 m-2
Cruiseid,"datum","Species","Age","TBioCrus"
----------------------
Density
*.csv
File with density of each age class of each species at each station in Ind. 
1000 m-2
Cruiseid,"datum","Station","NumStat","Species","Length","Age","T
Num","LN","TNum1000m"
----------------------
Density2
*.csv
File with density of each length class and age class of each species in Ind. 
1000 m-2
Cruiseid,"NumStat","datum","Species","Age","Length","LK","Help",
"TNumCr","TNumCrus"
----------------------
Density-Biomass
*.csv
file with Density and biomass of each age class of each species, same 
units as above
Cruiseid,"datum","Species","Age","TNumCr","Year","NumCrus","Lat
Name","TBioCrus"
----------------------
Names
*.csv
List of all species numbers with their corresponding Latin names 
(LatName)
Species,"LatName"
----------------------
Temp
*.csv
Mean temperature data (in degree Celsius) for each cruise
Cruiseid,"Temp"
----------------------
SpeciesCaughtY
*.csv
List if a certain species was caught at all in a certain cruise to include 0 
cases
Cruiseid,"Species","Age","datum","Year","Ind"
----------------------
macrobenthos
*.csv
Biomass of potential macrozoobenthic prey in each year (in 
Year, variable, Type, value
----------------------
Coeffcients
*.txt
Coefficients for each of the analyzed species 
Species, G-a, G-b, Q10, WW-AFDM, MaintC, AssiEff, a, b, ref
----------------------
2014-02-05FoodItems
*.txt
File with proportion of Macrozoobenthic prey (MP) to total diet of each 
species and age class
Species, Age, MP
----------------------
Growth
*.R
R script to calculate growth of the species
----------------------
FoodIntake
*.R
R script to calculate the food requirements 
----------------------
FunctionsFI
*.R
R functions file with functions used for calculations of growth and food 
requirement
----------------------
Plots
*.Rnw
Rnw file to produce plots


