Journal article
Mortality rates of small juvenile crown-of-thorns starfish Acanthaster planci on the Great Barrier Reef: implications for population size and larval settlement thresholds for outbreaks
Marine Ecology - Progress Series, Vol.597, pp.179-190
11/06/2018
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Source: InCites
Abstract
Crown-of-thorns starfish Acanthaster planci are a significant predator of scleractinian corals, with outbreak populations continuing to impose large-scale mortality on coral reef communities. We measured mortality rates of small post-settlement juvenile A. planci in a caging experiment on the Great Barrier Reef. Starfish 3 mm in diameter suffered mortality rates of 2.6% d-1, of which 73.0% was attributed to mobile predators. Starfish 13 mm in diameter had a lower rate of mortality of 0.82% d-1. There were no differences in mortality rates between sites, and localised effects, such as the presence of specific predators like the shrimp Hymenocera sp., affected within-site variability in mortality rates. The coral rubble habitat where the experiments were conducted had a large suite of generalist putative predators including both fish and invertebrates. The results from this and previously published studies were used to develop a model of size- and age-dependent mortality, which, when applied with the commonly accepted destructive outbreak threshold for adult A. planci of 10 ha-1 at age 2.5 yr, would require larval settlement rates of 5 m-2. Parameterising the magnitude of likely settlement rates and rates of post-settlement mortality provides a significant advance in understanding and modelling the population dynamics of this important coral predator.
Details
- Title
- Mortality rates of small juvenile crown-of-thorns starfish Acanthaster planci on the Great Barrier Reef: implications for population size and larval settlement thresholds for outbreaks
- Creators
- John K Keesing - Australian Institute of Marine ScienceAndrew R Halford - Australian Institute of Marine ScienceKarina C Hall - Australian Institute of Marine Science
- Publication Details
- Marine Ecology - Progress Series, Vol.597, pp.179-190
- Publisher
- Inter-Research
- Identifiers
- 991012927084402368
- Copyright
- © Inter-Research 2018
- Academic Unit
- National Marine Science Centre; Science; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article