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Seasonal variations in the density of and corallivory by Drupella rugosa and Cronia margariticola (Caenogastropoda: Muricidae) from the coastal waters of Hong Kong: ‘plagues’ or ‘aggregations’?

Published online by Cambridge University Press:  17 November 2008

Brian Morton*
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Graham Blackmore
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
Correspondence should be addressed to: Brian Morton, Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK email: prof_bmorton@hotmail.co.uk

Abstract

Sixteen coral sites in the coastal waters of Hong Kong were examined for the corallivorous muricid gastropods Drupella rugosa and Cronia margariticola. These were recorded from all sites where there was significant hard coral cover and observed feeding upon species of Platygyra, Leptastrea, Stylocoeniella, Porites, Favites, Cyphastrea, Goniastrea, Favia, Acropora, Montipora, Pavona, Lithophyllon, Hydnophora, Echinophyllia and Plesiastrea. One large aggregation (~2000 individuals) of, mainly, D. rugosa was observed but much smaller groups (<20 individuals) were more typical. Five sites were chosen for more detailed study and surveyed during winter and summer. Despite being characterized by different coral communities, inter-site densities of D. rugosa were not significantly different and, usually, ~2 individuals · m2 were recorded. Seasonal differences were, however, significant with numbers greater during the summer, possibly related to reproduction. Feeding activity followed a similar pattern and was also largely confined to summer.

Prey selection by Drupella rugosa was complex in the field and changed according to the relative abundance of each coral taxon. Acropora was strongly selected for at all sites where it was present and Montipora, Platygyra and Pavona were usually fed upon in greater proportions than their abundances. Leptastrea, Cyphastrea, Favites, Favia and Goniastrea were fed upon but in proportions lower than suggested by their abundances. Goniopora was never fed upon despite being relatively common. The seasonality of feeding, low density, rarity of large feeding aggregations, prey selection and aspects of the feeding behaviour, that is, generally only consuming the coral's coenenchyme (the polyps surviving), suggest that while D. rugosa is widespread in Hong Kong, and contrary to other views, it poses little, if any, threat to local coral communities. Thus, reported feeding clusters of D. rugosa are probably not ‘plague’ outbreaks but examples of seasonally fostered ‘aggregations’ of feeding (and probably reproducing) individuals. Indeed, no ‘plague-like’ outbreak of any species of Drupella has been reported upon in the literature since 1999.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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References

REFERENCES

Antonius, A. and Riegl, B. (1997) A possible link between coral diseases and a corallivorous snail (Drupella cornus) outbreak in the Red Sea. Atoll Research Bulletin 447, 29.CrossRefGoogle Scholar
Antonius, A. and Riegl, B. (1998) Coral diseases and Drupella cornus invasion in the Red Sea. Coral Reefs 17, 48.CrossRefGoogle Scholar
Ayling, A.M. and Ayling, A.L. (1987) Ningaloo Marine Park: preliminary fish density assessment and habitat survey, with information on coral damage due to Drupella cornus grazing. Western Australia: Department of Conservation and Land Management.Google Scholar
Baird, A. (1999) A large aggregation of Drupella rugosa following the mass bleaching of corals on the Great Barrier Reef. Reef Research 9, 67.Google Scholar
Birkland, C. and Lucas, J.S. (1990) Acanthaster planci: major management problem on coral reefs. Boca Raton, Florida: CRC Press.Google Scholar
Black, R. and Johnson, M.S. (1994) Growth rates in outbreak populations of the corallivorous gastropod Drupella cornus (Röding, 1798) at Ningaloo Reef, Western Australia. Coral Reef 13, 145150.CrossRefGoogle Scholar
Boucher, L.M. (1986) Coral predation by muricid gastropods of the genus Drupella at Enewetak, Marshall Islands. Bulletin of Marine Science 38, 911.Google Scholar
Collinson, P.R.J. (1997) The ecology of a peripheral, subtropical coral community in Hong Kong. PhD thesis. The University of Hong Kong, Hong Kong.CrossRefGoogle Scholar
Cope, M. (1986) Seasonal, diel and tidal hydrographic patterns, with particular reference to dissolved oxygen, above a coral community at Hoi Ha Wan, Hong Kong. Asian Marine Biology 3, 5974.Google Scholar
Cope, M. and Morton, B. (1988) The scleractinian coral community at Hoi Ha Wan; Hong Kong. Asian Marine Biology 5, 4152.Google Scholar
Cornish, A.S. and McKellar, D. (1998) Fishing with explosives and poisons in Hong Kong, China: history and legislation. In Proceedings of the APEC workshop on the Impacts of Destructive Fishing Practices on the Marine Environment, Hong Kong 1997. Hong Kong: Agriculture and Fisheries Department, pp. 8288.Google Scholar
Cumming, R.L. (1992) Interaction between coral assemblages and corallivores gastropods on the Great Barrier Reef. In Turner, S. (ed.) Drupella cornus: a synopsis. Department of Conservation and Land Management, CALM Occasional Paper No. 3/92, Western Australia, pp. 4344.Google Scholar
Cumming, R.L. (1999) Predation on reef-building corals: multiscale variation in the density of three corallivorous gastropods, Drupella spp. Coral Reefs 18, 147157.CrossRefGoogle Scholar
Cumming, R.L. and McCorry, D. (1998) Corallivorous gastropods in Hong Kong. Coral Reefs 17, 178.CrossRefGoogle Scholar
Feare, C.J. (1970) The adaptive significance of aggregation behaviour in the dogwhelk Nucella lapillus (L.). Oecologia 7, 117–26.CrossRefGoogle Scholar
Forde, M.J. (1992) Populations, behaviour and effects of Drupella cornus on the Ningaloo Reef, Western Australia. In Turner, S. (ed.) Drupella cornus: a synopsis. Department of Conservation and Land Management, CALM Occasional Paper No. 3/92, Western Australia, pp. 4550.Google Scholar
Fujioka, Y. (1982) On the secondary sexual characters found in the dimorphic radula of Drupella (Gastropoda: Muricidae) with reference to its taxonomic revision. Venus 40, 203223.Google Scholar
Fujioka, Y. and Yamazato, K. (1983) Host selection of some Okinawan coral associated gastropods belonging to the genera Drupella, Coralliophilia and Quoyula. Galaxea 2, 5973.Google Scholar
Harriott, V.J. (1999) Coral growth in subtropical eastern Australia. Coral Reefs 18, 281291.CrossRefGoogle Scholar
Hayes, J.A. (1990a) Distribution, movement and impact of the corallivorous gastropod Coralliophila abbreviata (Lamarck) on a Panamanian patch reef. Journal of Experimental Marine Biology and Ecology 142, 2542.CrossRefGoogle Scholar
Hayes, J.A. (1990b) Prey preference in a Caribbean corallivore, Coralliophila abbreviata (Lamarck) (Gastropoda, Coralliophilidae). Bulletin of Marine Science 47, 557560.Google Scholar
Holborn, K., Johnson, M.S. and Black, R. (1994) Population genetics of the corallivorous gastropod Drupella cornus at Ningaloo Reef, Western Australia. Coral Reefs 13, 3339.CrossRefGoogle Scholar
Jacobs, J. (1974) Quantitative measurement of food selection. A modification of the forage ratio and Ivlev's electivity index. Oecologia 14, 413417.CrossRefGoogle ScholarPubMed
Johnson, M.S. and Cumming, R.L. (1995) Genetic distinctness of three widespread and morphologically variable species of Drupella (Gastropoda, Muricidae). Coral Reefs 14, 7178.CrossRefGoogle Scholar
Johnson, M.S., Holborn, K. and Black, R. (1993) Fine-scale patchiness and genetic heterogeneity of recruits of the corallivorous gastropod Drupella cornus. Marine Biology 117, 9196.CrossRefGoogle Scholar
Kobluk, D.R. and Lysenko, M.A. (1993) Hurricane effects on shallow-water cryptic reef molluscs, Fiji Islands. Journal of Paleontology 67, 798816.CrossRefGoogle Scholar
Kohn, A.J. (1961) Chemoreception in gastropods molluscs. American Zoologist 1, 291308.CrossRefGoogle Scholar
Kohn, A.J. (1983) Feeding biology of gastropods. In Saleuddin, A.S.M. and Wilbur, K.M. (eds) The Mollusca. Volume 5. Physiology, Part 2. New York: Academic Press, pp. 163.Google Scholar
Krebs, C.J. (1989) Ecological methodology. New York: Harper Collins Publishers.Google Scholar
Kruskal, J.B. (1964) Multidimensional scaling by optimising goodness of fit to a nonmetric hypothesis. Psychometrika 29, 127.CrossRefGoogle Scholar
Lam, K. and Morton, B. (2003) Morphological and ITS1, 5.85, and partial ITS2 ribosomal DNA sequence distinctions between two species of Platygyra (Cnidaria: Scleractinia) from Hong Kong. Marine Biotechnology 5, 555567.CrossRefGoogle Scholar
Lam, K., Shin, P.K.S. and Hodgson, P. (2007) Severe bioerosion caused by an outbreak of corallivorous Drupella and Diadema at Hoi Ha Wan Marine Park, Hong Kong. Coral Reefs 26, 893.CrossRefGoogle Scholar
Littell, R.C., Milliken, G.A., Stroup, W.W. and Wolfinger, R.D. (1996) SAS® system for mixed models. Cary, North Carolina, USA: SAS Institute Inc.Google Scholar
Lun, J.C.-Y. (2003) Hong Kong reef-building corals. Hong Kong: Cosmos Books Ltd. 104 pp.Google Scholar
Margalef, D.R. (1958) Information theory in ecology. General Systems 3, 3671.Google Scholar
McClanahan, T.R. (1990) Kenyan coral reef-associated gastropod assemblages: distribution and diversity patterns. Coral Reefs 9, 6374.CrossRefGoogle Scholar
McClanahan, T.R. and Muthiga, N.A. (1989) Patterns of predation on a sea urchin, Echinometra mathaei (de Blainville), on Kenyan coral reefs. Journal of Experimental Marine Biology and Ecology 126, 7794.CrossRefGoogle Scholar
McCorry, D.M. and Blackmore, G. (2000) Tolo revisited: a resurvey of the corals and their metal burdens in Tolo Harbour and Channel twelve years and one million people later. In Morton, B. (ed.) Proceedings of the Fifth International Workshop on the Marine Flora and Fauna of Hong Kong and Southern China, Hong Kong 1998. Hong Kong: Hong Kong University Press, pp. 454484.Google Scholar
Meyers, R.F. (1991) Micronesian reef fishes. Guam, USA: Coral Graphics.Google Scholar
Morrisey, D.J., Underwood, A.J., Howitt, L. and Stark, J.S. (1992) Temporal variation in soft sediment benthos. Journal of Experimental Marine Biology and Ecology 164, 233245.CrossRefGoogle Scholar
Morton, B. (1992) A case for marine conservation: Hong Kong's scleractinian coral communities. In Morton, B. (ed.) Proceedings of the Fourth International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China, Hong Kong 1989. Hong Kong: Hong Kong University Press, pp. 313.Google Scholar
Morton, B. (2006) Scavenging behaviour by Ergalatax contractus (Gastropoda: Muricidae) and interactions with Nassarius nodifer (Gastropoda: Nassariidae) in the Cape d'Aguilar Marine Reserve, Hong Kong. Journal of the Marine Biological Association of the United Kingdom 86, 141152.CrossRefGoogle Scholar
Morton, B. & Ruxton, J. (1997) Hoi Ha Wan. Hong Kong: World Wide Fund for Nature Hong Kong.Google Scholar
Morton, B., Blackmore, G. and Kwok, C.T. (2002) Corallivory and prey choice by Drupella rugosa (Gastropoda: Muricidae) in Hong Kong. Journal of Molluscan Studies 68, 217223.CrossRefGoogle Scholar
Moyer, J.T., Emerson, W.K. and Ross, M. (1982) Massive destruction of scleractinian corals by the muricid gastropod, Drupella, in Japan and the Philippines. Nautilus 96, 6982.Google Scholar
Moyer, J.T., Higuchi, H., Matsuda, K. and Hasegawa, M. (1985) Threat to unique terrestrial and marine environments and biota in a Japanese National Park. Environmental Conservation 12, 293–30.CrossRefGoogle Scholar
Ng, W.C. and Morton, B. (2003) Genetic structure of the scleractinian coral Platygyra sinensis in Hong Kong. Marine Biology 143, 963968.CrossRefGoogle Scholar
Osborne, S. (1992) A preliminary summary of Drupella cornus distribution and abundance patterns following a survey of Ningaloo Reef in spring 1991. In Turner, S. (ed.) Drupella cornus: a synopsis. Western Australia: Department of Conservation and Land Management, CALM Occasional Paper No. 3/92, pp. 1117.Google Scholar
Pielou, E.C. (1984) The interpretation of ecological data. New York: John Wiley.Google Scholar
Pratt, D.M. (1976) Intraspecfic signalling of hunting success or failure in Urosalpinx cinerea Say. Journal of Experimental Marine Biology and Ecology 21, 79.CrossRefGoogle Scholar
Robertson, R. (1970) Review of the predators and parasites of stony corals, with special reference to symbiotic prosobranch gastropods. Pacific Science 24, 4354.Google Scholar
Scott, P.J.B. and Cope, M. (1982) The distribution of scleractinian corals at six sites within Tolo Harbour and Channel. In Morton, B. and Tseng, C.K. (eds) Proceedings of the First International Marine Biological Workshop: the Marine Flora and Fauna of Hong Kong and Southern China, Hong Kong, 1980. Hong Kong: Hong Kong University Press, pp. 575585.Google Scholar
Scott, P.J.B. and Cope, M. (1990) Tolo revisted: a resurvey of the corals in Tolo Harbour and channel six years and half a million people later. In Proceedings of the Second International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China, Hong Kong, 1986. (ed. Morton, B.). pp. 12031220. Hong Kong: Hong Kong University Press.Google Scholar
Taylor, J.D. (1980) Diets and habitats of shallow water predatory gastropods around Tolo Channel, Hong Kong. In Morton, B. (ed.) Proceedings of the First International Workshop on the Malacofauna of Hong Kong and Southern China, Hong Kong, 1977. Hong Kong: Hong Kong University Press, pp. 163165.Google Scholar
Taylor, J.D. and Morton, B. (1996) The diets of predatory gastropods in the Cape d'Aguilar Marine Reserve, Hong Kong. Asian Marine Biology 13, 141165.Google Scholar
Tong, L.K.Y. (1988) The reproductive biology of Thais clavigera and Morula musiva (Gastropoda: Muricidae) in Hong Kong. Asian Marine Biology 5, 6575.Google Scholar
Turner, S.J. (1994a) The biology and population outbreaks of the corallivorous gastropod Drupella on Indo-Pacific reefs. Oceanography and Marine Biology: an Annual Review 32, 461530.Google Scholar
Turner, S.J. (1994b) Spatial variability in the abundance of the corallivorous gastropod Drupella cornus. Coral Reefs 13, 4148.CrossRefGoogle Scholar
Underwood, A.J. (1981) Techniques of analysis of variance in experimental marine biology and ecology. Oceanography and Marine Biology: an Annual Review 19, 513605.Google Scholar
Underwood, A.J. (1994) Spatial and temporal problems of monitoring. In Calow, P. and Petts, G.E. (eds) The rivers handbook, Volume 2. Oxford, UK: Blackwell Scientific Press, pp. 101123.CrossRefGoogle Scholar
Veron, J.E.N. (1982) Hermatypic Scleractina of Hong Kong—an annotated list of species. In Morton, B. and Tseng, C.K. (eds) Proceedings of the First International Marine Biological Workshop: the Marine Flora and Fauna of Hong Kong and southern China, Hong Kong, 1980. Hong Kong: Hong Kong University Press, pp. 111125.Google Scholar
Veron, J.E.N. (1993) Corals of Australia and the Indo-Pacific. Honolulu, Hawaii: University of Hawaii Press.Google Scholar