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Dyspanopeus sayi

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Dyspanopeus sayi is a species of mud crab that is native to the Atlantic coast of North America. It has also become established outside its native range, living in Swansea Docks since 1960, the Mediterranean Sea since the 1970s, the North Sea since 2007 and the Black Sea since 2010. It can reach a carapace width of 20 mm (0.8 in), and has black tips to its unequal claws. It feeds on bivalves and barnacles, and is in turn eaten by predators including the Atlantic blue crab, Callinectes sapidus. Eggs are produced from spring to autumn, the offspring reach sexual maturity the following summer, and individuals can live for up to two years. The closest relative of D. sayi is D. texanus, which lives in the Gulf of Mexico; the two species differ in subtle features of the genitalia and the last pair of walking legs.

Description

Dyspanopeus sayi is a small crab, similar in appearance to Eurypanopeus depressus.[2] It reaches a maximum carapace width of 20 millimetres (0.8 in), with sexually mature females having a carapace 6.1 millimetres (0.24 in) or more across.[3] The carapace is roughly hexagonal, about 1.3–1.4 times as wide as long and strongly convex.[2] It has a finely granular surface,[4] and has a light covering of hair, especially towards the front and sides.[2] The chelae (claws) are unequal: the right claw is stouter, and the left claw is narrower.[4] The carapace is olive-green to brown, but the tips of the claws are black.[4]

Distribution

The natural range of D. sayi extends from the Baie des Chaleurs (eastern Canada) to the Florida Keys (south-eastern United States),[5] where it lives from the intertidal zone down to depths of 46 metres (151 ft).[6] It tolerates a wide range of temperatures and salinities.[6]

D. sayi has also been recorded from a number of locations in Europe. The first sighting was in Swansea Docks, South Wales (United Kingdom) in 1960, and the scientist who reported it, E. Naylor, believed there was "no doubt" that the species had arrived through trans-Atlantic shipping.[7] The first record from the Mediterranean Sea was made in 1993, when the species was discovered in the Venetian Lagoon (north-eastern Italy),[5] although it is thought to have been living there since the late 1970s.[4] In 2007, D. sayi was recorded from the North Sea coast of the Netherlands.[8] It was discovered in the Black Sea in 2010, living in Constanța harbour (Romania),[9] and in the Ebro delta of the Balearic Sea (western Mediterranean Sea) in 2012.[6]

Ecology

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The bivalve mollusc Chamelea gallina is a food item for D. sayi in the Adriatic Sea.

Dyspanopeus sayi lives predominantly on muddy bottoms,[2] where it is a predator of bivalve molluscs.[6] In its native environment, it hides among colonies of polychaetes to avoid being preyed on by the Atlantic blue crab, Callinectes sapidus.[3] It is an important predator of the quahog, Mercenaria mercenaria, in Narragansett Bay, and of the barnacle Balanus improvisus in Delaware Bay.[2] In the Adriatic Sea, it has been observed to feed on the striped venus clam, Chamelea gallina, and the introduced Asian date mussel, Musculista senhousia.[10]

Life cycle

The life cycle of D. sayi begins with copulation, which normally takes place shortly after the female has moulted, while her exoskeleton is still soft.[11] Spawning occurs within hours or days of copulation, and the eggs are brooded on the female's pleopods (swimmerets) until they are ready to hatch. Females have been found carrying eggs from April to October;[2] in a study of crabs caught at Gloucester Point, Virginia in 1978, females were observed to carry between 686 and 14,735 eggs. The number of eggs increases with carapace width according to a power law; extrapolation of the power law suggests that the largest D. sayi females are capable of carrying over 32,000 eggs each.[11]

At 29 °C (84 °F), the eggs can take only 9 or 10 days to develop, and this increases to 16 days at temperatures of 20 °C (68 °F).[11] The young crabs hatch as zoea larvae, and pass through three further zoeal stages and one megalopa before becoming juveniles.[6] Juveniles are thought to reach maturity in the summer after they hatch.[2] The total lifespan of an individual can be up to 2 years.[3]

Taxonomy

The species had been noticed by the American zoologist Thomas Say, and formed part of the species he called "Cancer panope" – a junior homonym of "Cancer panope" Herbst, 1801,[12] which is itself a junior synonym of Sphaerozius scaber (Fabricius, 1798).[13] In 1869, Sidney Irving Smith described seven new species in the genus Panopeus, including "P. sayi", in addition to the twelve species already placed in the genus at that time.[12] Common names for the species include "Say's mud crab" and "Say mud crab".

Smith noted the similarity of the species to "Panopeus texanus", which had been described ten years earlier by William Stimpson, and Smith considered that the two might be the same species.[12] In 1880, John Sterling Kingsley and Alphonse Milne-Edwards independently synonymised "P. sayi" with "P. texana", which remained until Mary J. Rathbun moved both taxa to the genus Neopanope and re-established Smith's taxon as a subspecies of "N. texana".[14] She argued that the two taxa should be considered subspecies, as hybrids between them occurred, although the specimens she saw are now thought to be D. sayi.[14]

In 1972, Lawrence G. Abele re-examined "N. texanus texanus", "N. texanus sayi" and N. packardi, and concluded that they were all good species, and so re-elevated "N. sayi" to the rank of species.[14] In 1986, Joel W. Martin and Abele placed N. texanus and N. sayi in a separate genus, Dyspanopeus, reaffirming their close relationship.[15] However, P. texana only occurs in the Gulf of Mexico, and can be distinguished from P. sayi by the form of the fifth pereiopod (last walking leg) and that of the male gonopod.[16]

References

  1. ^ Michael Türkay (2012). "Dyspanopeus sayi (Smith, 1869)". WoRMS. World Register of Marine Species. Retrieved February 9, 2012.
  2. ^ a b c d e f g Austin B. Williams (1965). "Marine decapod crustaceans of the Carolinas". Fishery Bulletin. 65 (1): 1–298.
  3. ^ a b c Melany P. Puglisi (October 1, 2008). "Dyspanopeus sayi". Indian River Lagoon Species Directory. Smithsonian Institution. Retrieved February 9, 2012.
  4. ^ a b c d "Dyspanopeus sayi (Smith, 1869) (Crustacea, Decapoda, Panopeidae)" (in Italian). Museo di Storia Naturale di Venezia. Archived from the original on February 18, 2013. Retrieved February 9, 2012.
  5. ^ a b Carlo Froglia & Simonetta Speranza (1993). "First record of Dyspanopeus sayi (Smith, 1869) in the Mediterranean Sea (Crustacea: Decapoda: Xanthidae)" (PDF). Quaderni dell'Istituto Ricerche Pesca Marittima. 5 (2): 163–166.CS1 maint: uses authors parameter (link)
  6. ^ a b c d e Christoph D. Schubart, Guillermo Guerao & Pere Abelló (2012). "First record and evidence of an established population of the North American mud crab Dyspanopeus sayi (Brachyura: Heterotremata: Panopeidae) in the western Mediterranean" (PDF). Scientia Marina. 76 (1): 79–85. doi:10.3989/scimar.03361.16A.CS1 maint: uses authors parameter (link)
  7. ^ E. Naylor (1960). "A North American xanthoid crab new to Britain". Nature. 187 (4733): 256–257. Bibcode:1960Natur.187..256N. doi:10.1038/187256a0.
  8. ^ S. Vaz, R. ter Hofstede, J. Martin, J.-M. Dewarumez, Y. Verin, D. Le Roy, H. Heessen & N. Daan (2007). "Benthic invertebrates community structure inferred from bottom trawl hauls observations and its relationships to abiotic conditions in the southern North Sea" (PDF). Structure and dynamics of the benthos in ICES waters. ICES Technical Report CM 2007/A: 03.CS1 maint: uses authors parameter (link)
  9. ^ Dragoș Micu, Victor Nițǎ & Valentina Todorova (2010). "First record of Say's mud crab Dyspanopeus sayi (Brachyura: Xanthoidea: Panopeidae) from the Black Sea" (PDF). Marine Biodiversity Records. 3: e36. doi:10.1017/S1755267210000308.CS1 maint: uses authors parameter (link)
  10. ^ Michele Mistri (2004). "Predatory behavior and preference of a successful invader, the mud crab Dyspanopeus sayi (Panopeidae), on its bivalve prey". Journal of Experimental Marine Biology and Ecology. 312 (2): 385–398. doi:10.1016/j.jembe.2004.07.012.
  11. ^ a b c Richard C. Swartz (1978). "Reproductive and molt cycles in the xanthid crab, Neopanope sayi (Smith, 1869)". Crustaceana. 34 (1): 15–32. doi:10.1163/156854078x00529. JSTOR 20103245.
  12. ^ a b c Sidney Irving Smith (1869). "Notes on new of little known species of American cancroid Crustacea". Proceedings of the Boston Society of Natural History. 12: 274–289.
  13. ^ Peter Davie (2010). "Cancer panope Herbst, 1801". WoRMS. World Register of Marine Species. Retrieved February 9, 2012.
  14. ^ a b c Lawrence G. Abele (1972). "A reevaluation of the Neopanope texanasayi complex with notes on N. packardii (Crustacea: Decapoda: Xanthidae) in the Northwestern Atlantic". Chesapeake Science. 13 (4): 263–271. JSTOR 1351110.
  15. ^ Joel W. Martin & Lawrence G. Abele (1986). "Notes on male pleopod morphology in the brachyuran crab family Panopeidae Ortmann, 1893, sensu Guinot (1978) (Decapoda)" (PDF). Crustaceana. 50 (2): 182–198. doi:10.1163/156854086x00205. JSTOR 20104136.
  16. ^ Harriet Perry & Kirsten Larsen (April 24, 2004). "Dyspanopeus texana (Stimpson, 1859) = Neopanope texana, Gulf grassflat crab" (PDF). Picture Guide to Shelf Invertebrates of the Northern Gulf of Mexico. Gulf States Marine Fisheries Commission. Retrieved February 9, 2012.
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Dyspanopeus sayi: Brief Summary

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Dyspanopeus sayi is a species of mud crab that is native to the Atlantic coast of North America. It has also become established outside its native range, living in Swansea Docks since 1960, the Mediterranean Sea since the 1970s, the North Sea since 2007 and the Black Sea since 2010. It can reach a carapace width of 20 mm (0.8 in), and has black tips to its unequal claws. It feeds on bivalves and barnacles, and is in turn eaten by predators including the Atlantic blue crab, Callinectes sapidus. Eggs are produced from spring to autumn, the offspring reach sexual maturity the following summer, and individuals can live for up to two years. The closest relative of D. sayi is D. texanus, which lives in the Gulf of Mexico; the two species differ in subtle features of the genitalia and the last pair of walking legs.

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Depth range

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Shallow-waters (0-100 m)
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bibliographic citation
Katsanevakis, S.; Bogucarskis, K.; Gatto, F.; Vandekerkhove, J.; Deriu, I.; Cardoso A.S. (2012). Building the European Alien Species Information Network (EASIN): a novel approach for the exploration of distributed alien species data. <em>BioInvasions Records.</em> 1: 235-245. Minchin, D.; Cook, E.; Clark, P. (2013). Alien species in British brackish and marine waters. <em>Aquatic Invasions.</em> 8(1): 3-19. d'Udekem d'Acoz, C. (1999). Inventory and distribution of the decapod crustaceans from the northeastern Atlantic, the Mediterranean and the adjacent continental waters north of 25°N. <em>Collection Patrimoines Naturels, 40. Muséum national d'Histoire naturelle.</em> Paris. ISBN 2-86515-114-10. X, 383 pp. North-West Atlantic Ocean species (NWARMS) North-West Atlantic Ocean species (NWARMS) Molnar, J. L.; Gamboa, R. L.; Revenga, C.; Spalding, M. D. (2008). Assessing the global threat of invasive species to marine biodiversity. <em>Frontiers in Ecology and the Environment.</em> 6(9): 485-492. Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77). Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77).
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Distribution

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Western Atlantic: southern Gulf of St. Lawrence to the Florida Keys
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WoRMS Editorial Board
bibliographic citation
Katsanevakis, S.; Bogucarskis, K.; Gatto, F.; Vandekerkhove, J.; Deriu, I.; Cardoso A.S. (2012). Building the European Alien Species Information Network (EASIN): a novel approach for the exploration of distributed alien species data. <em>BioInvasions Records.</em> 1: 235-245. Minchin, D.; Cook, E.; Clark, P. (2013). Alien species in British brackish and marine waters. <em>Aquatic Invasions.</em> 8(1): 3-19. d'Udekem d'Acoz, C. (1999). Inventory and distribution of the decapod crustaceans from the northeastern Atlantic, the Mediterranean and the adjacent continental waters north of 25°N. <em>Collection Patrimoines Naturels, 40. Muséum national d'Histoire naturelle.</em> Paris. ISBN 2-86515-114-10. X, 383 pp. North-West Atlantic Ocean species (NWARMS) North-West Atlantic Ocean species (NWARMS) Molnar, J. L.; Gamboa, R. L.; Revenga, C.; Spalding, M. D. (2008). Assessing the global threat of invasive species to marine biodiversity. <em>Frontiers in Ecology and the Environment.</em> 6(9): 485-492. Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77). Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77).
contributor
Mary Kennedy [email]

Distribution

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Introduced south-west of England (Swansea) (Clark, 1986)
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WoRMS Editorial Board
bibliographic citation
Katsanevakis, S.; Bogucarskis, K.; Gatto, F.; Vandekerkhove, J.; Deriu, I.; Cardoso A.S. (2012). Building the European Alien Species Information Network (EASIN): a novel approach for the exploration of distributed alien species data. <em>BioInvasions Records.</em> 1: 235-245. Minchin, D.; Cook, E.; Clark, P. (2013). Alien species in British brackish and marine waters. <em>Aquatic Invasions.</em> 8(1): 3-19. d'Udekem d'Acoz, C. (1999). Inventory and distribution of the decapod crustaceans from the northeastern Atlantic, the Mediterranean and the adjacent continental waters north of 25°N. <em>Collection Patrimoines Naturels, 40. Muséum national d'Histoire naturelle.</em> Paris. ISBN 2-86515-114-10. X, 383 pp. North-West Atlantic Ocean species (NWARMS) North-West Atlantic Ocean species (NWARMS) Molnar, J. L.; Gamboa, R. L.; Revenga, C.; Spalding, M. D. (2008). Assessing the global threat of invasive species to marine biodiversity. <em>Frontiers in Ecology and the Environment.</em> 6(9): 485-492. Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77). Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77).
contributor
[email]

Habitat

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infralittoral of the Gulf and estuary
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copyright
WoRMS Editorial Board
bibliographic citation
Katsanevakis, S.; Bogucarskis, K.; Gatto, F.; Vandekerkhove, J.; Deriu, I.; Cardoso A.S. (2012). Building the European Alien Species Information Network (EASIN): a novel approach for the exploration of distributed alien species data. <em>BioInvasions Records.</em> 1: 235-245. Minchin, D.; Cook, E.; Clark, P. (2013). Alien species in British brackish and marine waters. <em>Aquatic Invasions.</em> 8(1): 3-19. d'Udekem d'Acoz, C. (1999). Inventory and distribution of the decapod crustaceans from the northeastern Atlantic, the Mediterranean and the adjacent continental waters north of 25°N. <em>Collection Patrimoines Naturels, 40. Muséum national d'Histoire naturelle.</em> Paris. ISBN 2-86515-114-10. X, 383 pp. North-West Atlantic Ocean species (NWARMS) North-West Atlantic Ocean species (NWARMS) Molnar, J. L.; Gamboa, R. L.; Revenga, C.; Spalding, M. D. (2008). Assessing the global threat of invasive species to marine biodiversity. <em>Frontiers in Ecology and the Environment.</em> 6(9): 485-492. Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77). Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77).
contributor
Mary Kennedy [email]

Habitat

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Hard bottom (rock and rubbles)
license
cc-by-4.0
copyright
WoRMS Editorial Board
bibliographic citation
Katsanevakis, S.; Bogucarskis, K.; Gatto, F.; Vandekerkhove, J.; Deriu, I.; Cardoso A.S. (2012). Building the European Alien Species Information Network (EASIN): a novel approach for the exploration of distributed alien species data. <em>BioInvasions Records.</em> 1: 235-245. Minchin, D.; Cook, E.; Clark, P. (2013). Alien species in British brackish and marine waters. <em>Aquatic Invasions.</em> 8(1): 3-19. d'Udekem d'Acoz, C. (1999). Inventory and distribution of the decapod crustaceans from the northeastern Atlantic, the Mediterranean and the adjacent continental waters north of 25°N. <em>Collection Patrimoines Naturels, 40. Muséum national d'Histoire naturelle.</em> Paris. ISBN 2-86515-114-10. X, 383 pp. North-West Atlantic Ocean species (NWARMS) North-West Atlantic Ocean species (NWARMS) Molnar, J. L.; Gamboa, R. L.; Revenga, C.; Spalding, M. D. (2008). Assessing the global threat of invasive species to marine biodiversity. <em>Frontiers in Ecology and the Environment.</em> 6(9): 485-492. Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77). Poupin, J. (2018). Les Crustacés décapodes des Petites Antilles: Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et la Martinique. Muséum national d'Histoire naturelle, Paris, 264 p. (Patrimoines naturels ; 77).
contributor
[email]