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Diversity 2017, 9(1), 8; doi:10.3390/d9010008

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, QLD 4810, Australia
2
The Environment Institute and School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
3
AgroParisTech, Paris 75005, France
4
Coralquest Inc., 1-34-10 Asahicho, Atsugi 2430014, Japan
5
Deakin University, Geelong, Australia, School of Life and Environmental Sciences, Warrnambool Campus, Princes Hwy, Sherwood Park, PO Box 423, Warrnambool, VIC 3280, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Morgan Pratchett and Michael Wink
Received: 24 November 2016 / Revised: 25 January 2017 / Accepted: 30 January 2017 / Published: 7 February 2017
(This article belongs to the Special Issue Biology, Ecology and Management of Crown-of-Thorns Starfish)
View Full-Text   |   Download PDF [1978 KB, uploaded 7 February 2017]   |  

Abstract

Outbreaks of the crown-of-thorns seastar (CoTS) represent a major cause of coral loss on the Great Barrier Reef. Outbreaks can 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 experiment were conducted on CoTS 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 the 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. View Full-Text
Keywords: electivity; feeding behaviour; filtration rate; Great Barrier Reef; phytoplankton electivity; feeding behaviour; filtration rate; Great Barrier Reef; phytoplankton
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mellin, C.; Lugrin, C.; Okaji, K.; Francis, D.S.; Uthicke, S. Selective Feeding and Microalgal Consumption Rates by Crown-Of-Thorns Seastar (Acanthaster cf. solaris) Larvae. Diversity 2017, 9, 8.

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