Musyl et al.: Postrelease survival, vertical and horizontal movements, and thermal habitats of five species of pelagic sharks 
349 
Blue shark, Prionace glauca 
2001 PSATs (w=10) 
North - 
America 
Pacific Ocean 
B * > 
- ~ 
Vjjk* 'k 
Bine shark, Prionace glauca 
2002 PSATs (/?=6) 
\ J 
\ 
V ' o 
Silky shark, 
Carcharhinus falciform is (n= 1 0) 
Oceanic whitetip, 
Carcharhinus longimanus (/?= 13) 
3"-f 
i- 
F >- ' ^ 
Bigeye thresher, 
Alopias superciliosus (n= 3) 
Figure 1 
Most probable tracks for five species of pelagic sharks tagged with PSATs and released 
in the central Pacific Ocean were estimated from the raw geolocations using the Kalman 
filter-sea surface temperature state-space model (Appendix 1). Downward triangles indicate 
pop-up satellite archival tag (PSAT) deployment locations and upward triangles indicate 
PSAT pop-up locations. In situations where no geolocation data were returned, movements 
of sharks with from PSAT deployment to pop-up locations are indicated as a straight line. 
(A) Blue sharks ( Prionace glauca) tagged in 2001, where male shark movement patterns are 
shown in gray; (B) blue sharks (Prionace glauca) tagged in 2002, where male shark move- 
ment patterns are shown in gray; (C) silky sharks ( Carcharhinus falciformis ), where female 
movement patterns are shown in gray; (D) oceanic whitetip sharks (C. longimanus), where 
female movement patterns are shown in gray; (E) shortfin makos (Isurus oxyrinchus) (n = 2, 
both female); and (F) bigeye threshers, (Alopias superciliosus). 
IQR = 28.2-28.6°C) (MWBC, z= -39.47, Monte Carlo 
P<0.0001). Within and between these two geographic 
groups, significantly different trends for depth and tem- 
perature preferences during daytime and nighttime 
were also observed. 
Female shortfin makos remained significantly deeper 
and at cooler temperatures during the daytime than 
at nighttime (Figs. 3 and 7; Appendices 2 and 3). Un- 
like pronounced crepuscular patterns exhibited by blue 
sharks, bigeye threshers, silky sharks, and oceanic 
