Environmental Biology of Fishes

, Volume 98, Issue 1, pp 135–143

Broad salinity tolerance in the invasive lionfish Pterois spp. may facilitate estuarine colonization

Authors

    • Marine Sciences Program, Department of Biological SciencesFlorida International University
  • Patrick K. Nichols
    • Department of BiologyUniversity of Miami
  • Craig A. Layman
    • Marine Sciences Program, Department of Biological SciencesFlorida International University
    • Department of Applied EcologyNorth Carolina State University
Article

DOI: 10.1007/s10641-014-0242-y

Cite this article as:
Jud, Z.R., Nichols, P.K. & Layman, C.A. Environ Biol Fish (2015) 98: 135. doi:10.1007/s10641-014-0242-y

Abstract

The ongoing invasion of non-native Indo-Pacific lionfish (Pterois spp.) represents a significant ecological threat throughout the Western Atlantic and Caribbean. As a generalist species, lionfish have been able to rapidly colonize a wide variety of ecosystems, including coral reefs, seagrass beds, mangroves, the sea floor at depths as great as 300 m, and even brackish estuaries. While lionfish have been encountered in a number of estuarine systems, the spatial distribution of lionfish in estuaries is likely limited by the species’ ability to tolerate low salinities. Here, we experimentally identify minimum salinity tolerance in lionfish by measuring survival salinity minimum—the lowest salinity at which all individuals survive for 48 h. Additionally, we examine whether long-term exposure to low (but sub-lethal) salinities has negative effects on lionfish. Field observations in the Loxahatchee River estuary (Jupiter, FL) showed that lionfish can survive brief exposure to salinities as low as 1 ‰. At one estuarine location, fish survived exposure to salinity fluctuations of ~28 ‰ every 6 h for several days. In laboratory trials, survival salinity minimum for lionfish was 5 ‰; however, some individuals survived at 4 ‰ for up to 94 h before dying. Lionfish that were held at 7 ‰ for 28 days showed no differences in mortality, behavior or growth, when compared to control fish held at 35 ‰ (typical ocean salinity). This broad salinity tolerance may allow lionfish to colonize estuaries throughout their invaded range, and may facilitate dispersal across the Amazon-Orinoco plume. Because of the ecological and economic importance of estuaries, this facet of the lionfish invasion warrants further study.

Keywords

EstuaryIndian River LagoonInvasive marine fishLionfishPterois volitansSalinity tolerance

Supplementary material

10641_2014_242_MOESM1_ESM.pdf (28 kb)
ESM 1(PDF 28 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2014