Abstract

Tracking studies for invasive lionfish (Pterois volitans and P. miles) in the Western Atlantic can provide key information on habitat use to inform population control, but to date have likely underestimated home range size and movement due to constrained spatial and temporal scales. We tracked 35 acoustically tagged lionfish for >1 year (March 2018-May 2019) within a 35 km2 acoustic array within Buck Island Reef National Monument, St. Croix, U.S. Virgin Islands (10x larger than previous studies). Tracking lionfish at this scale reveals home range size is 3-20 times larger than previously estimated and varies more than 8-fold across individuals (48,000 m2 - 385,000 m2; average:101,000 m2), with estimates insensitive to assumptions about potential mortality for low-movement individuals. Lionfish move far greater distances than previously reported, with 37% of fish travelling >1 km from the initial tagging site toward deeper habitats, and one individual moving ~10 km during a 10-day period. Movement rates, home range size, and maximum distance traveled were not related to lionfish size (18 - 35 cm total length) or lunar phase. Lionfish movement was lowest at night and greatest during crepuscu-lar periods, with fish acceleration (m s-2) increasing with water temperature during these times. Our results help reconcile observed patterns of rapid recolonization following lionfish removal, and suggest complex drivers likely result in highly variable patterns of movement for similarly sized fish occupying the same habitat. Culling areas; the average lionfish home range size identified here (i.e., ~10 hectares), or prioritizing habitat patches isolated by ~180m (radius of average home range) may minimize subsequent recolonization. If the shallow-deep long-distance movements observed here are unidirec-tional, mesophotic habitats

PDF Preview