By Karl E. Miller
Florida scrub-jay (Aphelocoma coerulescens) populations throughout the state are vulnerable from the effects of habitat fragmentation. The species is mostly sedentary and rarely disperses long distances through non-scrub habitat. Currently, >90% of the remaining scrub-jay populations consist of fewer than 25 family groups.
FWC staff are conducting experimental translocations of Florida scrub-jays to determine the feasibility of a state-wide translocation program to stabilize smaller populations and prevent genetic isolation. The conservation goal is to transport – or “translocate” – birds from a large, stable population in the Ocala National Forest to smaller populations where extensive habitat has been restored but has not been discovered or occupied by Florida scrub-jays. FWC researchers are following up these translocations with intensive monitoring to determine whether the donor population is resilient to the loss of birds and also to determine their impact on populations at recipient sites.
During winter 2017 (December 22-March 21), we relocated 9 Florida scrub-jays, constituting 4 family groups, from Ocala National Forest to Seminole State Forest, which is a distance of >32 km. This initial translocation was a collaborative effort between staff from FWC, the Florida Forest Service, and the US Forest Service.
Translocated groups were tracked using radio telemetry to determine the extent to which they moved throughout the landscape and to understand interactions with neighboring groups. All birds survived transport and release and soon established breeding territories within 200 m of where they were released. During the first week of July, the first successful nest fledged.
In Ocala National Forest, the territories that were vacated were soon occupied by other Florida scrub-jays, including some groups that immigrated from adjacent sub-optimal habitat patches that were heavily overgrown.
Overall, translocated birds appeared to acclimate well to recipient sites, and populations at donor sites did not appear to be negatively affected, which suggests that future translocations will be a worthwhile tool for stabilizing and increasing populations of Florida scrub-jays on managed lands. During winter 2018, we will increase the number of birds moved and the number of recipient sites involved and continue to test the effectiveness of moving different age classes of scrub-jays. We will also continue to test the effectiveness of novel transport and release methods.