April 2, 2020

Tom update:

Looked at trends in species over time by veg type - some interesting trends there especially Kobresis increasing in dry meadows
Also looked at highly variable plots by subsetting plots were Deschampsia increased/decreased by 20
- logic here - what would Deschampsia be replacing if anything?
Veg classes - how are they calculated? Tom can ask Marco. Scott will check Ecosphere paper to see if code is there.
If veg classes aren't available for every year maybe just use one year, e.g., see if what was a dry meadow in 2010 is more likely to change than what was a wet meadow.

Use a map of the veg class + elevation on the saddle.

- Use this map to see if the snow metrics make sense

April 7, 2020

Zoom meeting, with Tom, Sean, and Scott present.

####Tom:

figuring out average change in plots for plots which actually change
maybe looking at plots with high coefficients of variation
- look for directionality in tends of a species
on to do list: spatial trends along with abiotic variables
- spatial autocorrelation is one way to do this
- animate this?

Temperature:

two datasets, neither complete, but probably can be combined to make a complete one
max-mean average; species might prefer warmer/cooler
read paper Tom sent
- extremes seem to have a large effect
- absolute metrics of extremes could be useful
the newer dataset (logger one) has a lot of data (e.g., soil temp, wind speed)
Talk with Sarah about temperature because she is working on this now
- could also talk with Courtney
Could maybe build models which relate temperature to soil temp, solar radiation, etc. to maybe get pre-2000 measurements of things missing from the logger data
maybe do variance partitioning
- mean temp over growing season
- GDD
Need to consider lags and time effects...
- looking at time-lags
- it's because the growth/shrinkage of one of these species depends on fecundity/veg growth in a given species
Veg class stuff - Marco's thing came from Hope Humphries, used 88 classificaiton
Gam: maybe fit only from maximum depth onward? We're mostly interested in the shape of the curve as the snow melts, not as it accumulates...
Temporal autocorrelation; e.g., DECE's abundance in 2006 probably affects its abundance in 2007...

Sean: will read papers collected Tom: will look into spatial autocorrelation (Fletcher & Fortin?) Scott: continue with gams and temperature stuff