Estimating sigma for SODO

[djhocking]

There were very few spatial recaptures for SODO (~4 in total). I used a moderately informative half normal prior on sigma (halfnorm(3, 2)). But the data pulled it close to zero and resulted in a bimodal posterior. Options:

1. Stronger prior (e.g. gamma(3, 2) or gamma(4, 1)) - requires info on home range size to justify
2. Dummer prior (e.g. uniform(0, 10)) - seems silly unless there's truly no known info
3. Don't do analysis for SODO because so few recaps

[djhocking]

@nthaydt Can you please gather any info on home range size for SODO or anything in the same genus so we can try a more informative prior?

[nthaydt]

Found the attached paper (Pérez-Pérez et al. 2017). It includes a table with literature values for home ranges (table 4) and a table with distances moved (table 5) for SODO and related species.

Here is a link to a table with additional information for home range/movement literature values (CPIC and SODO included so far).
https://docs.google.com/spreadsheets/d/13_6JsILABoB3FvHYY7dRc64-w9oz6woc7e3oFiJTM4A/edit?usp=sharing

2017-How_far_do_adult_turtles_move_Home_range_and_dispersal_of_Kinosternon_integrum.pdf