Feeding biology and symbiotic relationships of the corallimorpharian Paracorynactis hoplites (Anthozoa: Hexacorallia)

The Raffles bulletin of zoology (Impact Factor: 1.02). 08/2011;


Polyps of the corallimorpharian Paracorynactis hoplites were studied in coral reefs of the Davao Gulf, the Philippines, between October 2007 and January 2009. Polyps of Paracorynactis hoplites preyed mainly on echinoderms. Predation on seven species of echinoderms was observed in the fi eld (four asteroids, two echinoids and one holothurian); an additional ten species were accepted during feeding trials (four asteroids, four echinoids and two holothurians). The echinoids Diadema setosum, Diadema savignyi and Echinotrix calamaris, and the ophiuriod Ophiomastix sp. were not adversely affected by the polyps. The opisthobranch Phyllidiella pustulosa (Mollusca) was accepted during feeding trials, whereas the gastropod Cypraea tigris was not adversely affected. In a feeding experiment, polyps of Paracorynactis hoplites (maximum diameter 170 mm) completely ingested crown-of-thorns sea stars (Acanthaster planci) of up to 340 mm diameter. The polyps had a mean daily biomass uptake of 24.5 g d-1 when having a single-species asteroid diet. Fishes of several species of families Apogonidae, Gobiidae, Labridae, Pomacentridae, and Pseudochromidae as well as the shrimps (Periclimenes holthuisi, Periclimenes lacerate, Stenopus hispidus and Thor amboinensis) lived near or among the tentacles of the polyps.

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Available from: Arthur R. Bos
    • "For example, new Philippine fish species were recorded (Bos and Gumanao, 2013; Bos and Smits, 2013) and previously unknown fish (Motomura et al., 2001; Bos, 2014) and crab species (Husana et al., 2013) were taxonomically described. Moreover, the newly described polyps of the corallimorphian Paracorynactis hoplites (Oca~ na et al., 2010 ) were observed to prey intensively on the crown-of-thorns sea star Acanthaster planci (Bos et al., 2008Bos et al., , 2011), an ecological phenomenon so far only observed in the Davao Gulf. These unusual observations highlight the distinctiveness of biological populations in the Davao Gulf. "
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    ABSTRACT: Length–weight relationships (LWRs) of 139 coral reef and pelagic fish species (representing 34 fish families) were calculated based on 3806 individuals measured at local fish markets near the Davao Gulf in the southern Philippines during weekly visits between March 2009 and July 2011, as well as in June 2012. Fishes were caught with a variety of fishing methods, corroborated by abrasions and injuries. Forty-seven of 139 LWRs were firstly reported and new to science. The mean slope b of the LWRs was 3.035, indicating that the majority of studied species followed isometric growth. Standard length – total length relationships were calculated for all measured fish species. Additionally, standard length – fork length relationships are presented for 108 species. Moreover, fifteen new records of maximum fish length and weight are reported.
    No preview · Article · Jan 2016 · Journal of Applied Ichthyology
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    • "Earlier studies reported that coral skeletons of H. actiniformis may reach a maximum size of 21 cm (Hoeksema 1991b) representing an age of >40 years (Knittweis et al. 2009a). Because previous studies mention corallum size instead of polyp size, it is uncertain whether H. actiniformis corals in Davao Gulf grow larger than in other locations, as observed for the sea star Protoreaster nodosos (Bos et al. 2008a) despite high predation rates (Bos et al. 2008bBos et al. , 2011). The free-living corals of H. actiniformis occupy all kinds of environments and substrates from coastal habitats to offshore and from shallow reef flats and lagoons to deep sandy reef bases (Hoeksema 1991aHoeksema , 2012aHoeksema , 2012b). "
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    ABSTRACT: The free-living solitary mushroom coral Heliofungia actiniformis resembles sea anemones by having large, fleshy polyps with long tentacles, which provide shelter to symbiotic organisms. Commensal shrimps are well studied, but little is known about associated fish fauna. Therefore, the associated fauna of 118 coral polyps of H. actiniformis was examined at a depth range of 4–28 m in the Davao Gulf, Philippines. The distribution of associated fishes and symbiotic invertebrates highly depended on the size of the coral host: Large corals polyps (>18 cm) supported co-inhabiting fishes and commensal shrimps, medium-sized polyps (diameter 5–18 cm) hosted either fishes or shrimps, and small coral polyps (<5 cm) were uninhabited. Fifteen fish species, representing the Apogonidae, Gobiidae, Labridae, and Pomacentridae, were found. Among these, the gobies Eviota lachdeberei and E. rubriceps, and the labrid Oxycheilius celebicus were most common, making up for 77%of all fishes encountered. Total length of the fish ranged from 1 to 6 cm covering adult gobies and juveniles of the other families. Four species of commensal shrimps were hosted by the coral polyps. This study further constitutes the first record of brittle stars of the genus Ophiothrix (Echinodermata: Ophiuroidea) living among tentacles of H. actiniformis.
    Full-text · Article · Apr 2015 · Environmental Biology of Fishes
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    ABSTRACT: Several specimens of the pseudochromid Manonichthys alleni, with total length ranging from 45–60 mm, were observed at depths of 19–28 m in a coral reef in the Davao Gulf in the southern Philippines. Each specimen lived within a separate colony of the tubular sponge Callyspongia aerizusa. This constitutes the first record in the Philippine archipelago of a dottyback so far only known from Indonesian and Malaysian waters.
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