Ecological Archives E096-051-A5

Jamin Dreyer, Philip A. Townsend, James C. Hook III, David Hoekman, M. Jake Vander Zanden, and Claudio Gratton. 2015. Quantifying aquatic insect deposition from lake to land. Ecology 96:499–509. http://dx.doi.org/10.1890/14-0704.1

Appendix E. Model coefficients, evaluation, and comparison to midge infall data collected at Lake Mývatn, 2008–2011.

Table E1. Model coefficients of 3-parameter local maxima model, distance of maximum deposition (first derivative), maximum distance of deposition (terminus; see Methods), and model fit, for the six models developed from midge infall measurements around Lake Mývatn, Iceland during the summers 2008–2011.

Decay Model Parameters and Measure of Fit

Data

   

Distance of maximum

   

aggregation

Midge

a

b

c

deposition (m)

Max. Dist. (m)

Pseudo R²

Annual

Large (Chironomus)

0.053

0.170

-0.005

38

578

0.8281

Annual

Small (Tanytarsus)

0.083

0.121

-0.008

13

357

0.8393

Annual

All

0.080

0.093

-0.006

16

454

0.8887

Weekly

Large (Chironomus)

0.040

0.302

-0.008

52

395

0.8472

Weekly

Small (Tanytarsus)

0.070

0.203

-0.011

19

295

0.8290

Weekly

All

0.070

0.166

-0.008

20

359

0.9212

 

Table E2. Local maxima decay model evaluation for the "annual" and "weekly" models comparisons predicted and observed proportions of midge infall at Lake Mývatn, Iceland during the summers 2008–2011.

Decay Model Evaluation

Year Removed

Data

Pseudo R²

None

Annual

0.8887

2008

Annual

 0.8304

2009

Annual

 0.9416

2010

Annual

 0.9039

2011

Annual

 0.8726

None

Weekly

0.9212

2008

Weekly

 0.8052

2009

Weekly

 0.9535

2010

Weekly

 0.9366

2011

Weekly

 0.9209

 

FigE1

Fig. E1. Midge deposition as predicted by the "emergence constrained" model compared to midge deposition "observed" from infall traps around Lake Mývatn, Iceland May-August between 2008–2011. There was a strong positive relationship (F1,99 = 240.1, P <<0.0001, adj. psuedo-R² = 0.701) between estimated midge deposition from our model and observed midge infall from cup traps, with year (F3,88 = 2.92, P = 0.038) and transect (F8,88 = 6.51, P <<0.0001) also significant. This pattern, lying above the 1:1 dashed line, indicates that while infall traps along transects are highly correlated with modeled deposition from the emergence constrained model, they overestimate deposition by a factor of ~20–30X.


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