The following is a description of the data files associated with Strayer, D.L. 2020. Non-native species have multiple abundance-impact curves.

NOTE: these files all contain output from simulation models, NOT data measured in the field!

Contact for questions about these data: David Strayer (strayerd@caryinstitute.org). 

LIST OF INCLUDED DATA FILES (all are tables of SIMULATED data in .csv format)

Strayer_2020_fig3_shell_production_equilibrial.csv (simulations used in Fig. 3 of shell accumulation at equilibrium in three bodies of water)

Strayer_2020_fig4_shell_production_simple_dynamics.csv (simulations used in Fig. 4 of shell accumulation dynamics in three bodies of water with constant Dreissena populations)

Strayer_2020_fig5_shell_production_variable_dynamics.csv (simulations used in Fig. 5 of shell accumulation dynamics in two bodies of water with variable Dreissena populations)

Strayer_2020_fig7_macrophyte_habitat.csv (simulations used in Fig. 7 of changes in habitat for submerged macrophytes as a function of Dreissena abundance)

DESCRIPTIONS OF INDIVIDUAL DATA SETS

Dataset: “Strayer_2020_fig3_shell_production_equilibrial.csv”
Variables:
shell_production = annual shell production in units of kgDM/m^2-yr
standing_stock(k=-0.05) = simulated standing stock (kgDM/m^2) at equilibrium in a body of water with k = -0.05 (i.e., a hardwater lake); k is the instantaneous shell dissolution rate in units of 1/yr
standing_stock(k=-0.3) = simulated standing stock (kgDM/m^2) at equilibrium in a body of water with k = -0.3 (i.e., a moderately hardwater lake); k is the instantaneous shell dissolution rate in units of 1/yr
standing_stock(k=-2) = simulated standing stock (kgDM/m^2) at equilibrium in a body of water with k = -2 (i.e., a moderately hardwater river); k is the instantaneous shell dissolution rate in units of 1/yr

Dataset: “Strayer_2020_fig4_shell_production_simple_dynamics.csv”
Variables:
standing_stock(k=-0.05) = simulated standing stock (kgDM/m^2) in year y in a body of water with k = -0.05 (i.e., a hardwater lake); k is the instantaneous shell dissolution rate in units of 1/yr
standing_stock(k=-0.3) = simulated standing stock (kgDM/m^2) in year y in a body of water with k = -0.3 (i.e., a hardwater lake); k is the instantaneous shell dissolution rate in units of 1/yr
standing_stock(k=-0.2) = simulated standing stock (kgDM/m^2) in year y in a body of water with k = -2 (i.e., a hardwater lake); k is the instantaneous shell dissolution rate in units of 1/yr
year

Dataset: “Strayer_2020_fig5_shell_production_variable_dynamics.csv”
Variables:
Biomass = standing biomass of the Dreissena population (g shell-free dry mass per square meter, based on data from the Hudson River – see Strayer et al. 2020. Freshwater Biology); assumed to be proportional to annual inputs to the spent shell pool
Loss_hard = simulated annual loss (kg per square meter) via dissolution from the spent shell pool in the hardwater lake, with k = -0.05/yr
Loss_soft = simulated annual loss (kg per square meter) via dissolution from the spent shell pool in the moderately hardwater river, with k = -2/yr
Notes = notes on model assumptions
Spent_hard = standing stock (kg per square meter) of spent shells in the hardwater lake, with k = -0.05/yr
Spent_soft = standing stock (kg per square meter) of spent shells in the moderately hardwater river, with k = -0.2/yr
Year

Dataset: “Strayer_2020_fig7_macrophyte_habitat.csv”
Variables:
%euphotic_eu_deep = % of the bottom area of the eutrophic deep lake within the photic zone of submerged macrophytes (5% of surface light)
%euphotic_eu_shallow = % of the bottom area of the eutrophic shallow lake within the photic zone of submerged macrophytes (5% of surface light)
%euphotic_eu_shelf = % of the bottom area of the eutrophic shelf lake within the photic zone of submerged macrophytes (5% of surface light)
%euphotic_oligo_deep = % of the bottom area of the oligotrophic deep lake within the photic zone of submerged macrophytes (5% of surface light)
%euphotic_oligo_shallow = % of the bottom area of the oligotrophic shallow lake within the photic zone of submerged macrophytes (5% of surface light)
%euphotic_oligo_shelf = % of the bottom area of the oligotrophic shelf lake within the photic zone of submerged macrophytes (5% of surface light)
chl_eu = simulated chlorophyll concentration in the eutrophic lake, in micrograms per liter
chl_oligo = simulated chlorophyll concentration in the oligotrophic lake, in micrograms per liter
notes = notes on model assumptions
secchi_eu = secchi disk depth (m) in the eutrophic lake, calculated from the chlorophyll concentration as secchi = 10^(-0.473*log10(chl)+0.803) (see Rast, W. & Lee, G.F. (1978). Summary analysis of the North American (U.S. portion) OECD eutrophication project: nutrient loading – lake response relationships and trophic state indices. EPA-600/3-78-08. United States Environmental Protection Agency, Corvallis.
secchi_oligo = secchi disk depth (m) in the oligotrophic lake, calculated from the chlorophyll concentration as secchi = 10^(-0.473*log10(chl)+0.803) (see Rast, W. & Lee, G.F. (1978). Summary analysis of the North American (U.S. portion) OECD eutrophication project: nutrient loading – lake response relationships and trophic state indices. EPA-600/3-78-08. United States Environmental Protection Agency, Corvallis.
ZMFR% = assumed Dreissena (“zebra mussel”) filtration rate, as % of the water column per day