[Coral-List] New Paper: Invasive lionfish had no measurable effect on prey fish community structure across the Belizean Barrier Reef

Serena Hackerott snhackerott at gmail.com
Wed May 31 17:45:08 EDT 2017

New paper published in PeerJ: https://peerj.com/articles/3270/

Invasive lionfish are assumed to significantly affect Caribbean reef fish
communities. However, evidence of lionfish effects on native reef fishes is
based on uncontrolled observational studies or small-scale,
unrepresentative experiments, with findings ranging from no effect to large
effects on prey density and richness. Moreover, whether lionfish affect
populations and communities of native reef fishes at larger,
management-relevant scales is unknown. The purpose of this study was to
assess the effects of lionfish on coral reef prey fish communities in a
natural complex reef system. We quantified lionfish and the density,
richness, and composition of native prey fishes (0–10 cm total length) at
sixteen reefs along ∼250 km of the Belize Barrier Reef from 2009 to 2013.
Lionfish invaded our study sites during this four-year longitudinal study,
thus our sampling included fish community structure before and after our
sites were invaded, i.e., we employed a modified BACI design. We found no
evidence that lionfish measurably affected the density, richness, or
composition of prey fishes. It is possible that higher lionfish densities
are necessary to detect an effect of lionfish on prey populations at this
relatively large spatial scale. Alternatively, negative effects of lionfish
on prey could be small, essentially undetectable, and ecologically
insignificant at our study sites. Other factors that influence the dynamics
of reef fish populations including reef complexity, resource availability,
recruitment, predation, and fishing could swamp any effects of lionfish on
prey populations.

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