May et al.: Fine-scale movements of Pristis pectinata 
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Date 
Figure 6 
Example patterns of weekly diel movements of 6 tagged smalltooth sawfish (Pristis pecti¬ 
nata) in the Peace River, Florida, by hour and date: (A) >1 year old (sawfish 3), (B) young 
of the year (YOY, sawfish 17), (C) >1 year old (sawfish 15), (D) YOY (sawfish 18), (E) YOY 
(sawfish 16), and (F) YOY (sawfish 19). River kilometer (rkm) refers to distance from the 
river mouth (i.e., rkm 0), and gray bars indicate night. The Vemco Positioning System 
(VPS) was located at rkm 6-8. Sawfish ID numbers correspond to those in Table 1. In 
general, individuals of both age classes remained in or near the protected cove (rkm 9-11) 
during the day and moved downriver and toward the southern shoreline, where they were 
detected within the VPS, at night. 
of the Peace River, to obtain fine-scale data on where juve¬ 
nile smalltooth sawfish reside during the day. In addition, 
results of recent work indicate that internally placed acous¬ 
tic tags can eliminate tag retention issues and allow col¬ 
lection of year-round data over multiple years (Poulakis 
and Grubbs, 2019); therefore, the tracking data from these 
arrays will provide a more complete picture of how juve¬ 
niles use the most productive habitats within their broader 
nurseries. Although this technology offers many benefits, 
we recognize that it may not be accessible to all researchers 
because of the cost and maintenance involved, but it may 
be worth the investment if the most productive habitats 
can be identified for a species of interest. 
Acknowledgments 
This research was supported primarily by grant 
NA13NMF4720047 from the National Marine Fisheries 
Service (NMFS) under Section 6 of the U.S. Endangered 
Species Act (Cooperation with the States) and grant no. 
02012016-001 from the Nature Conservancy. Research was 
conducted pursuant to NMFS endangered species permit 
no. 15802. C. Saari and 3 anonymous reviewers improved 
earlier versions of the manuscript. Statements, findings, 
conclusions, and recommendations are those of the authors 
and do not necessarily reflect the views or policies of the 
funding agencies. 
