390 
Fishery Bulletin 115(3) 
ALL: depth SD ~ s(long, lat) + s(mld) + s(SST) + s(size, k = 6) 
Figure 7 
Formulas and corresponding smoothing terms (thin-line regression splines, black lines) with 95% confidence inter- 
vals (dotted lines) for the best-fitted generalized additive models used in this study of vertical movements of oce- 
anic whitetip sharks ( Carcharhinus longimanus). The models were based on data from 6 tagged oceanic whitetip 
sharks in the Atlantic and Indian oceans between 2011 and 2012, with the daily depth standard deviation (SD) 
as the response variable. Shown are the splines for (A) mixed-layer depth (MLD), (B) sea-surface temperature 
(SST), and (C) size for the model that used all 6 sharks, MLD for the model that used the shark tagged in the 
Indian Ocean (IOCS1) (D), MLD and SST for the models that used an individual shark tagged in the Atlantic 
Ocean — (E-F) AOCS3, (G-H) AOCS5, (I-J) AOCS6 — and (K) SST for the model that used a shark tagged in the 
Atlantic Ocean (AOCS7). Splines (s) are not shown for a fourth smoothing term, longitude (long.) and latitude 
(lat). K=number of individuals. 
