Suspended sediment alters predator–prey interactions between two coral reef fishes
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Sediment derived from agriculture and development increases water turbidity and threatens the health of inshore coral reefs. In this study, we examined whether suspended sediment could change predation patterns through a reduction in visual cues. We measured survivorship of newly settled Chromis atripectoralis exposed to Pseudochromis fuscus, a common predator of juvenile damselfishes, in aquaria with one of four turbidity levels. Increased turbidity led to a nonlinear response in predation patterns. Predator-induced mortality was ~50 % in the control and low turbidity level, but exhibited a substantial increase in the medium level. In the highest turbidity level, predation rates declined to the level seen in the control. These results suggest an imbalance in how the predator and prey cope with turbidity. A turbidity-induced change to the outcome of predator–prey interactions represents a major change to the fundamental processes that regulate fish assemblages.
KeywordsTurbidity Sediment thresholds Damselfish Predation
This study was completed in accordance with the JCU animal ethics board under permit number A1619. This study was funded by an Australian Coral Reef Society grant to ASW and Australian Research Council, Centre of Excellence funding to GPJ. We thank Geoff Endo for field assistance and the staff at Lizard Island Research Station (Australian Museum) for logistical support.
- Fabricius KE, De’ath G, Humphrey C, Zagorskis I, Schaffelke B (2012) Intra-annual variation in turbidity in response to terrestrial runoff on near-shore coral reefs of the Great Barrier Reef. Estuar Coast Shelf Sci. doi: 10.1016/j.ecss.2012.03.010
- Hect T, Van de Lingen CD (1992) Turbidity-induced changes in feeding strategies of fish in estuaries. S Afr J Zool 27:95–107Google Scholar
- Hixon MA (1991) Predation as a process structuring coral reef fish communities. In: Sale PF (ed) The ecology of coral reef fishes. Academic Press, San Diego, pp 475–500Google Scholar
- Hobson ES (1979) Interactions between piscivorous fishes and their prey. In: Stroud RH, Clepper H (eds) Predator–prey systems in fisheries management. Sport Fishing Institute, Washington, DC, pp 231–242Google Scholar
- Jones GP (1991) Postrecruitment processes in the ecology of coral reef fish populations: a multifactorial perspective. In: Sale PF (ed) The ecology of fishes on coral reefs. Academic Press, San Diego, pp 294–328Google Scholar
- Lima SL, Steury TD (2005) The perception of predator risk—the foundation of non-lethal predator–prey interactions. In: Barbosa P, Castellanos I (eds) Ecology of predator/prey interactions. Oxford University Press, Oxford, pp 166–188Google Scholar
- Ogston AS, Storlazzi CD, Field ME, Presto MK (2004) Sediment resuspension and transport patterns on a fringing reef flat, Molokai, Hawaii. Coral Reefs 23:559–569Google Scholar
- Reid SM, Fox MG, Whillans TH (1999) Influence of turbidity on piscivory in largemouth bass (Micropterus salmoides). Can J Fish Aquat Sci 56:1362–1369Google Scholar
- Swenson WA (1978) Influence of turbidity on fish abundance in Western Lake Superior. Research report of the United State Environmental Protection Agency, Duluth, pp 1–84Google Scholar
- Utne AC (1997) The effect of turbidity and illumination on the reaction distance and search time of the marine planktivore Gobiusculus flavescens. J Fish Biol 50:926–938Google Scholar