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Marine reserves (MRs) may function as a vital tool in the conservation and management of marine resources if source populations are managed for the benefit of those downstream. Consequently, it is critical to evaluate the home range of marine animals to ensure that MRs are large enough to protect source populations. We used acoustic telemetry to study movements of adult queen conch (Strombus gigas) within aggregations at two sites in the Florida Keys from June 1997 through July 1998. A total of 68 conch were tagged and tracked for up to one year. Latitude and longitude of each conch were recorded biweekly and data used to estimate the minimum speed, degree of site fidelity, and home range of each animal. Conch showed significantly greater displacement/ time during the summer. There were no significant differences in movement rate, site fidelity, or size of home range between males and females. Mean home range was 5.98 ha. Based on estimated home ranges of the aggregations, the size and location of the existing reserves at these two sites were inadequate to protect the conch aggregations should the fishery reopen. Florida. However, overharvesting and habitat loss led to the closure of the commercial fishery in 1976 followed by the closure of the recreational fishery in 1986. Despite the harvest moratorium, the population has not recovered to historical levels (Glazer and Berg 1994, Berg and Glazer 1995, Florida Fish and Wildlife Conservation Commission unpublished data). The lack of recovery has been attributed in part to diminished larval supply and recruitment resulting from small spawning aggregations (Stoner et al. 1997, Stoner and Ray-Culp 2000). On July 1, 1997, the Florida Keys National Marine Sanctuary instituted a Zoning Action Plan that established a network of marine reserves (Figure 1) to protect sensitive marine resources from overuse and to separate conflicting visitor uses (US Department of Commerce 1996). These reserves, called Sanctuary Preservation Areas (SPAs) or Special Use Areas depending on their management goals, were implemented with consideration of the needs of sensitive habitats (e.g., reefs) and the socioeconomic impacts to fishers. They were implemented specifically to “enhance the reproductive capabilities of renewable resources [and] protect areas critical for sustaining and protecting important marine species.” All consumptive harvesting is prohibited within the boundaries of these reserves. Because Florida conch spawning aggregations are located in or close to the reserves (Florida Fish and Wildlife Conservation Commission unpublished data), the FKNMS has funded conch spawning aggregation Gulf and Caribbean Research Vol. 14(2), 79–89, 2003 Manuscript received March 2, 2002; accepted June 12, 2002

Estimating Queen Conch (Strombus gigas) Home Ranges Using Acoustic Telemetry: Implications for the Design of Marine Fishery Reserves