Larval survivorship and settlement of Crown-of-Thorns Starfish (Acanthaster cf. solaris) at varying algal cell densities

The dispersal potential of crown-of-thorns starfish (CoTS) larvae is important in understanding both the initiation and spread of population outbreaks, and is fundamentally dependent upon how long larvae can persist while still retaining the capacity to settle. This study quantified variation in larval survivorship and settlement rates for CoTS maintained at three different densities of a single-celled flagellate phytoplankton, Proteomonas sulcata (1 × 103, 1 × 104, and 1 × 105 cells/mL). Based on the larval starvation hypothesis, we expected that low to moderate levels of phytoplankton prey would significantly constrain both survival and settlement. CoTS larvae were successfully maintained for up to 50 days post-fertilization, but larval survival differed significantly between treatments. Survival was greatest at intermediate food levels (1 × 104 cells/mL), and lowest at high (1 × 105 cells/mL) food levels. Rates of settlement were also highest at intermediate food levels and peaked at 22 days post-fertilization. Peak settlement was delayed at low food levels, probably reflective of delayed development, but there was no evidence of accelerated development at high chlorophyll concentrations. CoTS larvae were recorded to settle 17–43 days post-fertilization, but under optimum conditions with intermediate algal cell densities, peak settlement occurred at 22 days post-fertilization. Natural fluctuations in nutrient concentrations and food availability may affect the number of CoTS that effectively settle, but seem unlikely to influence dispersal dynamics.

[1]  M. Berumen,et al.  Microsatellites Reveal Genetic Homogeneity among Outbreak Populations of Crown-of-Thorns Starfish (Acanthaster cf. solaris) on Australia’s Great Barrier Reef , 2017 .

[2]  C. Mellin,et al.  Selective Feeding and Microalgal Consumption Rates by Crown-of-Thorns Seastar (Acanthaster cf. solaris) Larvae , 2017 .

[3]  Hugh Sweatman,et al.  Spatiotemporal modelling of crown‐of‐thorns starfish outbreaks on the Great Barrier Reef to inform control strategies , 2017 .

[4]  R. Babcock,et al.  Relationships between size and reproductive output in the crown-of-thorns starfish , 2016 .

[5]  M. Fox,et al.  Crown-of-Thorns Starfish Larvae Can Feed on Organic Matter Released from Corals , 2016 .

[6]  M. Pratchett,et al.  Predation on crown-of-thorns starfish larvae by damselfishes , 2016, Coral Reefs.

[7]  M. Pratchett,et al.  The Role of Maternal Nutrition on Oocyte Size and Quality, with Respect to Early Larval Development in The Coral-Eating Starfish, Acanthaster planci , 2016, PloS one.

[8]  J. Brodie,et al.  Environmental triggers for primary outbreaks of crown-of-thorns starfish on the Great Barrier Reef, Australia. , 2015, Marine pollution bulletin.

[9]  S. Nagai,et al.  Genetic connectivity of the coral-eating sea star Acanthaster planci during the severe outbreak of 2006–2009 in the Society Islands, French Polynesia , 2015 .

[10]  M. Byrne,et al.  Larval Starvation to Satiation: Influence of Nutrient Regime on the Success of Acanthaster planci , 2015, PloS one.

[11]  S. Uthicke,et al.  Climate change as an unexpected co-factor promoting coral eating seastar (Acanthaster planci) outbreaks , 2015, Scientific Reports.

[12]  M. Berumen,et al.  The role of individual variation in marine larval dispersal , 2014, Front. Mar. Sci..

[13]  M. Byrne,et al.  Larvae of the coral eating crown‐of‐thorns starfish, Acanthaster planci in a warmer‐high CO2 ocean , 2014, Global change biology.

[14]  Kenneth R. N. Anthony,et al.  Connectivity networks reveal the risks of crown-of-thorns starfish outbreaks on the Great Barrier Reef , 2014 .

[15]  G. Haszprunar,et al.  An integrative approach to the taxonomy of the crown-of-thorns starfish species group (Asteroidea: Acanthaster): A review of names and comparison to recent molecular data. , 2014, Zootaxa.

[16]  M. Byrne,et al.  The thermal tolerance of crown-of-thorns (Acanthaster planci) embryos and bipinnaria larvae: implications for spatial and temporal variation in adult populations , 2014, Coral Reefs.

[17]  D. R. Robertson,et al.  Adult and larval traits as determinants of geographic range size among tropical reef fishes , 2013, Proceedings of the National Academy of Sciences.

[18]  John Sibert,et al.  AD Model Builder: using automatic differentiation for statistical inference of highly parameterized complex nonlinear models , 2012, Optim. Methods Softw..

[19]  P. Smouse,et al.  There's No Place Like Home: Crown-of-Thorns Outbreaks in the Central Pacific Are Regionally Derived and Independent Events , 2012, PloS one.

[20]  S. Nielsen,et al.  Do Cues Matter? Highly Inductive Settlement Cues Don't Ensure High Post-Settlement Survival in Sea Urchin Aquaculture , 2011, PloS one.

[21]  M. Pratchett,et al.  High gene flow across large geographic scales reduces extinction risk for a highly specialised coral feeding butterflyfish , 2011, Molecular ecology.

[22]  J. Brodie,et al.  Dispersal of suspended sediments and nutrients in the Great Barrier Reef lagoon during river-discharge events: conclusions from satellite remote sensing and concurrent flood-plume sampling , 2010 .

[23]  G. De’ath,et al.  Three lines of evidence to link outbreaks of the crown-of-thorns seastar Acanthaster planci to the release of larval food limitation , 2010, Coral Reefs.

[24]  K. Nadaoka,et al.  Gene flow of Acanthaster planci (L.) in relation to ocean currents revealed by microsatellite analysis , 2009, Molecular ecology.

[25]  J. Benzie,et al.  A threat to coral reefs multiplied? Four species of crown-of-thorns starfish , 2008, Biology Letters.

[26]  A. Baird,et al.  Survival dynamics of scleractinian coral larvae and implications for dispersal , 2008, Coral Reefs.

[27]  Alan Y. Chiang,et al.  Generalized Additive Models: An Introduction With R , 2007, Technometrics.

[28]  Jon Brodie,et al.  Spatial and temporal patterns of near-surface chlorophyll a in the Great Barrier Reef lagoon , 2007 .

[29]  G. Jones,et al.  Local Replenishment of Coral Reef Fish Populations in a Marine Reserve , 2007, Science.

[30]  M. Pratchett.  Dynamics of an outbreak population of Acanthaster planci at Lizard Island, northern Great Barrier Reef (1995–1999) , 2005, Coral Reefs.

[31]  O. Hoegh‐Guldberg.  Uptake of dissolved organic matter by larval stage of the crown-of-thorns starfish Acanthaster planci , 1994, Marine Biology.

[32]  J. Parrish.  The Ecology of Fishes on Coral Reefs , 1993 .

[33]  S. Rumrill,et al.  Natural mortality of marine invertebrate larvae , 1990 .

[34]  R. R. Olson.  In situ culturing as a test of the larval starvation hypothesis for the crown‐of‐thoms starfish, Acanthaster planci1 , 1987 .

[35]  J. Lucas.  Quantitative studies of feeding and nutrition during larval development of the coral reef asteroid Acanthaster planci (L.) , 1982 .

[36]  R. Kenchington,et al.  Growth and recruitment of Acanthaster planci (L.) on the great barrier reef , 1977 .

[37]  J. Henderson,et al.  Larval Development and Metamorphosis of Acanthaster planci (Asteroidea) , 1971, Nature.

[38]  R. S. Scheltema.  LARVAL DISPERSAL AS A MEANS OF GENETIC EXCHANGE BETWEEN GEOGRAPHICALLY SEPARATED POPULATIONS OF SHALLOW-WATER BENTHIC MARINE GASTROPODS , 1971 .

[39]  R Core Team,et al.  R: A language and environment for statistical computing. , 2014 .

[40]  M. Pratchett,et al.  LIMITS TO UNDERSTANDING AND MANAGING OUTBREAKS OF CROWN-OF-THORNS STARFISH (ACANTHASTER SPP.) , 2014 .

[41]  R. Toonen,et al.  Widespread Dispersal of the Crown-of-Thorns Sea Star, Acanthaster planci, across the Hawaiian Archipelago and Johnston Atoll , 2011 .

[42]  Jon Brodie,et al.  Are increased nutrient inputs responsible for more outbreaks of crown-of-thorns starfish? An appraisal of the evidence. , 2005, Marine pollution bulletin.

[43]  M. Helm,et al.  Hatchery culture of bivalves: a practical manual , 2004 .

[44]  Eric Wolanski,et al.  Sticky Waters in the Great Barrier Reef , 2000 .

[45]  J. Lucas,et al.  Selective feeding by larvae of the crown-of-thorns starfish, Acanthaster planci (L.) , 1997, Coral Reefs.

[46]  B. Victor.  CHAPTER 9 – Settlement Strategies and Biogeography of Reef Fishes , 1991 .

[47]  R. Richmond.  Energetics, competency, and long-distance dispersal of planula larvae of the coral Pocillopora damicornis , 1987 .

[48]  R. S. Scheltema.  Long-distance dispersal by planktonic larvae of shoal-water benthic invertebrates among central Pacific Islands , 1986 .

[49]  E. Wolanski,et al.  Physical properties of Great Barrier Reef lagoon waters near Townsville. II. Seasonal variations , 1981 .

[50]  R. R. Strathmann.  Length of pelagic period in echinoderms with feeding larvae from the Northeast Pacific , 1978 .