FWGNA > Species Accounts > Ampullariidae > Pomacea maculata
Pomacea maculata (Perry 1810)
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> Habitat & Distribution

Native to South America, invasive pest Pomacea species have spread throughout Florida and into portions of six other southeastern states at the present writing, as well as to east Asia and through the Pacific islands (Carlsson et al. 2004a, Joshi & Sebastian 2006, Byers et al. 2013).  Invasive Pomacea populations were first reported from Georgia in 2005, appearing in the Alabaha River near Blackshear, Pierce County (See my essay of 17Sept05 below).  By the summer of 2007, reliable reports had reached us of Pomacea introductions in the towns of St. Marys and Alma (Bacon Co.), as well as on St. Simons Island.  In May of 2008 the first population was documented in South Carolina (See my essays of 15May08 and 14Aug08 from the links below).   In 2010 word reached us of an introduction in South Carolina's Lake Marion, and in 2013 we confirmed two populations in the Charleston area.  See the essays of 25July13 and 13June18 for updates on Pomacea in South Carolina.

Throughout their introduced range, Pomacea populations are typically found in disturbed environments – retention ponds and drainage ditches with low flow and large standing crops of aquatic macrophytes.  The Lake Marion population seems localized to a small section of lake margin around vacation houses and docks.  FWGNA Incidence rank I-3p.

> Ecology & Life History

Pomacea is a voracious consumer of almost any aquatic vegetation (Baker et al. 2010, Burks et al. 2011), including crops such as rice and taro (Estebenet 1995).  The snails can survive months of dewatering by burrowing and enclosing their shells tightly (Wada & Matsukura 2011).  Large eggs are laid in pink clusters on emergent vegetation and other solid surfaces above the water line.  Maturity can be reached in as little as three months or may require two yClick for largerears, depending on the environment, with iteroparous reproduction thereafter (Andrews 1964, Albrecht et al. 1999, Martin & Estebenet 2002).  Estebenet & Cazzaniga (1992) estimated r = 0.09 and R = 20.1 for a laboratory population in Argentina.  Sex determination appears to be oligogenic (Yusa 2004b, 2006, 2007, see also my essay of 11Aug05 below).

Pomacea populations can exert significant competition/predation pressure on other populations of freshwater snails (Kwong et al. 2009), leading to some experimentation with their suitability for the biological control of the pulmonate hosts of schistosomiasis (review by Dillon 2000: 215-219, 300-301).  Pomacea (of all species) are themselves liable to fall prey to the endangered Everglades kite (Cattau et al. 2010), as well as to a variety of other predators (Carlsson et al. 2004b).  Overall ecosystem effects of Pomacea invasion have been explored by Fang and colleagues (2010).

Pomacea was spread through Asia at least partly in a conscious effort by farmers hoping to harvest the snails for food.  Many of the Asian populations are albinistic, with unpigmented bodies and yellow shells, and are often referred to as "golden apple snails" (Yusa 2004a).  Here in the United States most of the populations are pigmented, and their spread seems to have been accidental, perhaps via aquarium hobbyists.  Additional information on the consequences of Pomacea introduction in Texas is available from Howells (2005a & b).  The model of Byers et al. (2013) suggested that the potential range of P. maculata may ultimately extend along the lower coastal plain of the Carolinas as far north as the Virginia line. 

For comprehensive reviews of the biology, ecology, and life history of Pomacea worldwide, see Joshi & Sebastian (2006), Hayes et al. (2012, 2015) and Joshi et al (2017).  For more about the South Carolina populations, see Gooding et al (2018).

> Taxonomy & Systematics

The systematics of the Ampullariidae in general, and of invasive Pomacea in particular, have become quite an active area of research interest in recent years (Cowie & Thiengo 2003, Hayes et al. 2009).  We initially identified the exotic populations introduced here in South Carolina and Georgia as P. canaliculata, although mtDNA data suggested to Rawlings and colleagues (2007) that our populations might better match the nomen P. insularum.  Then a paper published by Hayes and colleagues in late 2012 led us to re-re-identify our local populations as P. maculata, the third name at the top of this page in eight years.  See my essay of 25July13 for more.  

Recent data from the Far East suggest that hybridization between P. maculata and P. canaliculata may be widespread, although no-choice mating experiments have returned evidence of reduced hatchability in F1 hybrid egg masses (Matsukura et al. 2013).  Mate choice tests would be a welcome addition to the research program.

> Supplementary Resources

> Essays

  • See my post of 11Aug05, "Ampullariids star at Asilomar" for a review of Yoichi Yusa's oligogenic model of sex determination in Ampullariids on 11Aug05, together with some thoughts regarding the ongoing systematic work of Cowie and Hayes.
  • I posted the newspaper article reporting the initial discovery of Pomacea in Georgia on 17Sept05.  The essay includes links to a variety of online references and contributions from Bob Howells in Texas.
  • See my post of 24May07 for a review of the large book by Joshi & Sebastian, "Global Advances in Ecology and Management of Golden Apple Snails."
  • I reported "Pomacea Spreads to South Carolina" on 15May08.  That post also included a couple fresh figures of adults and eggs.
  • I updated the South Carolina situation in my "Two Dispatches from the Pomacea Front" on 14Aug08.  That post included links to an SC DNR flier, distribution map, newspaper articles, photos, and more.
  • On 25July13 I bundled together several Pomacea News items, including reviews of the papers by Hayes et al (2013) and Byers et al. (2013), as well as updates on the status of our local invasions here in South Carolina, and notes on the toxicity of eggs.
  • Although technically restricted, invasive pest Pomacea are not uncommonly offered for sale among hobbyists and in local pet stores.  See my posts of 9Oct 17 What's Out There, 14Feb18 Freshwater Gastropods and Social Media, and 16Mar18 Psst, Buddy! Wanna buy and Apple Snail?.
  • I posted another batch of Pomacea news on 13June18, featuring a review of recent research on the specific distinction between P. maculata and P. canaliculata.  See Invasive Species Updates.

> References

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Andrews, E. B.  (1964)  The functional anatomy of the mantle cavity, kidney and blood system of some pilid gastropods.  J. Zool. 146: 70 - 94.  
Andrews, E. B. (1965)  The functional anatomy and histology of the reproductive system of some pilid gastropod  molluscs.  Proc. Malac. Soc. Lond. 36: 121 -140.
Baker, P., F. Zimmanck, and S. Baker. 2010. Feeding rates of an introduced freshwater gastropod Pomacea insularum on native and nonindigenous aquatic plants in Florida. J. Moll. Stud. 76: 138-143.
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Byers, J. E., W. McDowell, S. Dodd, R. Haynie, L. Pintor & S. Wilde (2013)
 Climate and pH predict the potential range of the invasive apple snail (Pomacea insularum) in the southeastern United States.  PLoS ONE 8 (2): e56812.
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Carlsson, N., A. Kestrup, M. Martensson, and P. Nystrom. 2004b. Lethal and non-lethal effects of multiple indigenous predators on the invasive golden apple snail (Pomacea canaliculata). Freshw. Biol. 49: 1269-1279.
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Dreon, M., M. Frassa, M. Ceolin, S. Ituarte, J-W. Qiu, J. Sun, P. Fernandez, and H. Heras. 2013. Novel animal defenses against predation: a snail egg neurotoxin combining lectin and pore-forming chains that resembles plant defense and bacteria attack toxins. PLoS ONE 8: e63782. 
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Takeichi, M., Y. Hirai, and Y. Yusa. 2007. A water-born sex pheromone and trail following in the apple snail, Pomacea canaliculata. J. Moll. Stud. 73: 275-278.
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Yusa, Y.  (2004a)  Inheritance of color polymorphism and the pattern of sperm competition in the apple snail Pomacea canaliculata.  J. Moll. Stud.  70: 43 - 48.  
Yusa, Y.  (2004b)  Brood sex ratio in the apple snail Pomacea canaliculata is determined genetically and not by environmental factors.  J. Moll. Stud.  70: 269 - 275.  
Yusa, Y. (2006)  Genetics of sex-ratio variation inferred from parent-offspring regressions and sib correlations in the apple snail Pomacea canaliculata.  Heredity 96: 100-105.
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