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The Pelagic Crab Planes Cyaneus (Dana, 1851) (Decapoda, Brachyura, Grapsidae) in the Southwestern Atlantic Ocean in Association with Loggerhead Sea Turtles and Buoys

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The Pelagic Crab Planes Cyaneus (Dana, 1851) (Decapoda, Brachyura, Grapsidae) in the Southwestern Atlantic Ocean in Association with Loggerhead Sea Turtles and Buoys THE PELAGIC CRAB PLANES CYANEUS (DANA, 1851) (DECAPODA, BRACHYURA, GRAPSIDAE) IN THE SOUTHWESTERN ATLANTIC OCEAN IN ASSOCIATION WITH LOGGERHEAD SEA TURTLES AND BUOYS BY M. PONS1,2,4),A.VERDI3) and A. DOMINGO1,2) 1) Centro de Investigación y Conservación Marina (CICMAR), Giannattasio km. 30,5 El Pinar, CP 15008, Canelones, Uruguay 2) Departamento de Recursos Pelágicos, Dirección Nacional de Recursos Acuáticos, Constituyente 1497, CP 11200, Montevideo, Uruguay 3) Sección Entomología, Facultad de Ciencias, Universidad de la República, Iguá 4225, CP 11400, Montevideo, Uruguay ABSTRACT This study describes the population structure of the crab Planes cyaneus Dana, 1851 associated with loggerhead sea turtles, Caretta caretta (Linnaeus, 1758), and inanimate flotsam in the south- western Atlantic Ocean. Samples were collected by scientific observers onboard fishing vessels of ◦ ◦ ◦ ◦ the Uruguayan tuna fleet operating between 29 -38 S and 30 -56 W, from May 2002 to July 2005. A total of 140 crabs were sampled, with cephalothorax lengths ranging from 5.6 to 22.9 mm. Eighty- eight percent of the crabs found on loggerhead turtles were adult. However, adults represented only 50% of the crabs found on buoys. We detected no relation between the turtles’ carapace size and the number of crabs on each turtle. Over 50% of the sampled turtles presented a single crab; the rest presented two to five crabs. Some characteristics observed for P. cyaneus in the southwestern Atlantic Ocean were similar to those found by other authors for its congener, Planes minutus,inthe North Atlantic. Results from the present study, also, extend the known geographic distribution of P. cyaneus in the southwestern Atlantic Ocean into offshore waters and suggest that these crabs op- portunistically colonize whatever substrates are available in pelagic environments where substrates are scarce. RESUMEN Este estudio describe la estructura poblacional del cangrejo Planes cyaneus Dana, 1851 en asociación con la tortuga cabezona, Caretta caretta (Linnaeus, 1758), y boyas en el Océano Atlántico Sur oeste. Las muestras fueron recolectadas por observadores científicos a bordo de barcos pesqueros ◦ ◦ ◦ ◦ de la flota atunera Uruguaya que operaron entre los 29 -38 Sy30-56 W entre Mayo de 2002 4) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2011 Crustaceana 84 (4): 425-434 Also available online: www.brill.nl/cr DOI:10.1163/001121611X557064 426 M. PONS, A. VERDI & A. DOMINGO y Julio de 2005. Un total de 140 cangrejos fueron muestreados, con un largo de cefalotórax que varió entre 5,6 y 22,9 mm. Ochenta y ocho por ciento de los cangrejos encontrados en las tortugas cabezonas eran adultos. Sin embargo los adultos sólo representaron el 50% de los cangrejos encontrados en boyas. No se detectó relación entre el tamaño del caparazón de las tortugas y el número de cangrejos presentes en las mismas. Más del 50% de las tortugas muestreadas presentaron un único cangrejo; el resto presentó una alta heterogeneidad de grupos de dos a cinco individuos. Algunas características observadas para P. cyaneus en el Océano Atlántico Sur oeste fueron similares a las encontradas por otros autores para su congénere, Planes minutus, en el Atlántico Norte. Los resultados del presente estudio, además, amplían la distribución geográfica conocida de P.cyaneus en el Océano Atlántico Sur oeste hacia aguas más alejadas de la costa y sugieren que este cangrejo tiene hábitos oportunistas colonizando diferentes sustratos disponibles, particularmente en el ambiente pelágico donde los mismos son escasos. INTRODUCTION The crabs of the genus Planes Bowdich, 1825 are distributed in tropical and temperate waters of the Atlantic, Indian, and Pacific oceans. This genus comprises three species of marine grapsid crabs: Planes minutus (Linnaeus, 1758), Planes cyaneus Dana, 1851, and Planes marinus Rathbun, 1914. All three species of Planes have all been documented from the Atlantic Ocean. P. minutus was reported from the coasts of Africa and in the North Atlantic (from 11◦Nto52◦N); P.cyaneus for Africa, Brazil, and Uruguay, as well as for the North Atlantic and the Gulf of Mexico; and P. marinus for Brazil, Argentina, and St. Helena Island (Chace, 1951; Juanicó, 1976; Spivak & Bas, 1999; Prado & De Melo, 2002; Carranza et al., 2003; Bugoni et al., 2007). Unlike other grapsid crabs, these species are exclusively pelagic and occur in as- sociation with different floating objects (Chace, 1951; Davenport, 1992). They are often found associated with living substrates such as algae (e.g., Sargassum spp.), scyphozoans (e.g., Velella spp.), gastropods (e.g., Janthina spp.) (Chace, 1951; Davenport, 1994; Dellinger et al., 1997), sea turtles (Caretta caretta (Linnaeus, 1758), Chelonia mydas (Linnaeus, 1758), Lepidochelys olivacea (Eschscholtz, 1829) and Eretmochelys imbricata (Linnaeus, 1766)) (Geiselman, 1983; Daven- port, 1994; Frick et al., 2000, 2004, 2006; Wicksten & Behrens, 2000; Miranda & Moreno, 2002; Carranza et al., 2003; Bugoni et al., 2007), as well as on inani- mate objects such as wood, buoys, rope, and plastic, among others (Juanicó, 1976; Dellinger et al., 1997; Spivak & Bas, 1999). During recent years there have been several reports of Planes spp. associated with sea turtles, the majority of which deal with P. minutus and the loggerhead sea turtle, C. caretta, in the North Atlantic (Davenport, 1994; Dellinger et al., 1997; Frick et al., 2000, 2004). These studies suggest a mutualistic relationship between crabs and turtles. The crabs are thought to forage on epibiota, thereby cleaning turtles of fouling organisms and improving their hydrodynamic performance (Frick.
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