Preprint Article Version 1 NOT YET PEER-REVIEWED

Selective Feeding and Microalgal Consumption Rates by Crown-of-Thorns Seastar (Acanthaster cf. solaris) Larvae

  1. Australian Institute of Marine Science PMB No 3, Townsville, Queensland 4810, Australia
  2. The Environment Institute and School of Biological Sciences, The University of Adelaide, South Australia 5005, Australia
  3. AgroParisTech, 75005 Paris, France
  4. Coralquest Inc., 1-34-10 Asahicho, Atsugi 2430014, Japan
  5. School of Life and Environmental Sciences, Deakin University, Warrnambool Campus, Princes Hwy, Sherwood Park, PO Box 423, Warrnambool VIC 3280, Australia
Version 1 : Received: 24 November 2016 / Approved: 24 November 2016 / Online: 24 November 2016 (11:27:13 CET)

How to cite: Mellin, C.; Lugrin, C.; Okaji, K.; Francis, D.; Uthicke, S. Selective Feeding and Microalgal Consumption Rates by Crown-of-Thorns Seastar (Acanthaster cf. solaris) Larvae. Preprints 2016, 2016110124 (doi: 10.20944/preprints201611.0124.v1). Mellin, C.; Lugrin, C.; Okaji, K.; Francis, D.; Uthicke, S. Selective Feeding and Microalgal Consumption Rates by Crown-of-Thorns Seastar (Acanthaster cf. solaris) Larvae. Preprints 2016, 2016110124 (doi: 10.20944/preprints201611.0124.v1).

Abstract

Outbreaks of the crown-of-thorns seastar (CoTS) represent a major cause of coral loss on the Great Barrier Reef. Outbreaks might be explained by enhanced larval survival supported by higher phytoplankton availability after flood events, yet little is known about CoTS larvae feeding behaviour, in particular their potential for selective feeding. Here, single- and mixed-species feeding experiments were conducted on CoTS bipinnaria larvae using five algae (Phaeodactylum tricornutum, Pavlova lutheri, Tisochrysis lutea , Dunaliella sp. and Chaetoceros sp.) and two algal concentrations (1000 and 2500 algae mL-1). Cell counts using flow-cytometry at the beginning and end of each incubation experiment allowed us to calculate the filtration and ingestion rates of each species by CoTS larvae. In line with previous studies, CoTS larvae ingested more algae when initial algal concentration was higher. We found evidence for the selective ingestion of some species (Chaetoceros sp., Dunaliella sp.) over others (P. lutheri, P. tricornutum). The preferred algal species had the highest energy content, suggesting that CoTS selectively ingested the most energetic algae. Ultimately, combining these results with spatio-temporal patterns in phytoplankton communities will help elucidate the role of larval feeding behaviour in determining the frequency and magnitude of CoTS outbreaks.

Subject Areas

electivity; feeding behavior; filtration rate; Great Barrier Reef; phytoplankton

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