Chapman_capturehistories.csv - README This is the small mammal capture history data which we used in the Spatially Explicit Capture Recapture (SECR) models in the paper. Each row represents a single capture of one small mammal, on one day, in one single-catch trap, on one trapping grid, in one sampling year. This data is used in conjunction with the "trap location" datahseet as one of the two essential components of an SECR model. For modelling using the R package "secr", this master dataset needs to be split up by trapping grid and saved as separate datasheets: the trap locations and small mammal populations are obviously specific to each grid. The datasheet for each grid should also be saved WITHOUT COLUMN HEADINGS, or "secr" returns an error. Column headings are included here solely for clarity. The first column "Session" corresponds to the trapping year, and is used to structure multi-session models. NB the grids D1-1, D1-2, D10-1, D10-2, F1-1, F1-2, F100-1, and F100-2 were only trapped in one year, so these were not run as multi-session models and the "session" column is strictly uneccessary for these grids. In general, R package "secr" ignores "session" if all values are identical. The second column "Individual ID" corresponds to the ID of the small mammal captured. In nearly every case, this is the number of the PIT tag fitted to that animal (a ten-digit alphanumeric string starting with 041, note that we replaced all zeros "0" with capital letters "O" to circumvent problems with Microsoft Excel). In some cases where an animal was not tagged but had no chance of being captured again (generally either 1.) untagged animals found dead in the trap or 2.) live, identified animals not tagged for any reason (e.g individual escaped) at the end of a trapping session on a grid which was not trapped subsequently) a different ID is applied. In case 1, this comprises the words "NewDead" and a identifier number eg. "NewDead25". In case 2, the species code (see below) and a number is used eg "LGTRS02". The third column "Occasion" records the trapping day. Our grids were trapped for seven consecutive days annually, therefore occasions are integers from 1 to 7. Clearly, these numbers are repeated between sessions corresponding to different years; the specification of a multisession model ensures that "secr" does not treat, for example, Occasion 5 in 2011 as the same actual day as Occasion 5 in 2012. Negative occasion numbers denote animals which died on this occasion; this is the standard notation "secr" uses to remove those individuals from the pool. The fourth column "Trap" is the trap location or "detector" in SECR terminology. Our grid design is formed of 48 numbered sampling points in twelve lines of four (23m separation), with each point having two traps (A and B). There are six possible grid locations in each SAFE project sampling block - two each in the forest areas which will eventually become 1, 10, and 100 ha experimental fragments (for more details of the sampling design, see Ewers, R.M. et al, Phil. Trans. R. Soc. B (2011) 366, 3292–3302). The blocks are denoted A-F; we sampled in D, E and F. Therefore the trap location identifier is in the format "Block""Fragment"-"Grid"-"Point""Trap". Examples: E100-2-3A, D10-1-34B. The fifth column "Species" is a factor covariate in the SECR models allowing density to be estimated across any number of species. For brevity, species are recorded as codes: CTRS = Common Treeshrew, Tupaia longipes DTT = Dark-Tailed Tree Rat, Niviventer cremoriventer LGTRS = Large Treeshrew, T. tana LTG = Long-tailed Giant Rat, Leopoldamys sabanus MR = Muller's Rat, Sundamys muelleri RS = Red Spiny Rat, Maxomys surifer SLTRS = Slender Treeshrew, T. gracilis SS = Small Spiny Rat, M. baeodon WH = Whitehead's Rat, M. whiteheadi