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Size and Shape Variation of Two Freshwater Crabs in Argentinean Patagonia: The Influence of Sexual Dimorphism, Habitat, and Species Interactions

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AbstractThe morphological variation of Aegla neuquensis and A. riolimayana was studied using a geometric morphometric. Specimens included both allopatric and sympatric populations from rivers and lakes of the Argentinean Patagonia. Cephalothorax shape was analyzed throughout 16 landmarks representing the half configurations of all specimens after symmetrization process. Ordination analysis of the weight matrix revealed a clear distinction between the two species. Multivariate test run on the weight matrix for A. neuquensis and A. riolimayana was highly significant (P < 0.0001). Females and males of the two species differ significantly (P < 0.0001). Females of A. neuquensis and A. riolimayana present a wider posterior region, probably to carry eggs and juveniles. The first relative warp clearly indicates a difference in the shape of crabs inhabiting rivers vs. those living in lakes (P < 0.0001). Lake specimens show a more compact rostrum than river individuals. This is probably associated with the difference in the dynamics of both systems. The shape of A. neuquensis in allopatric populations appears to be similar to the shape of A. riolimayana, while sympatric populations appear much closer to the “typical” A. neuquensis shape. Thus, allopatric populations appear in some way to expand their shape toward A. riolimayana.

Affiliations: 1: a(FG) Instituto Nacional de Limnología (INALI-CONICET-UNL), José Maciá 1933, CP 3016, Santo Tomé, Santa Fe, Argentina Argentina (


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1. Abrams P. A. 1980 "Resource partitioning and interspecific competition in a tropical hermit crab community." Oecologia Vol 46 1432 1939
2. Adams D. C. 1999 "Methods for shapes analysis of landmark data from articulate structures." Evolutionary Ecology Research Vol 1 959 970
3. Bond-Buckup G., Buckup L. 1994 "A familia Aeglidae (Crustacea, Decapoda, Anomura)." Arquivos de Zoologia Vol 32 4 159 346
4. Collins P. A. 2005 "A coexistence mechanism for two freshwater prawns in the Paraná River floodplain, Argentina." Journal of Crustacean Biology Vol 25 219 225
5. Correia A. M. 2001 "Seasonal and interspecific evaluation of predation by mammals and birds on the introduced red swamp crayfish Procambarus clarkii (Crustacea, Cambaridae) in a freshwater marsh (Portugal)." Journal of Zoology Vol 255 533 541
6. Eggleston D. B., Lipcius R. N. 1992 "Shelter selection by spiny lobster under variable predation risk, social conditions, and shelter size." Ecology Vol 73 992 1011
7. Giri F., Collins P. A. 2004 "A geometric morphometric analysis of two sympatric species of the family Aeglidae (Crustacea, Decapoda, Anomura) from the La Plata basin." Italian Journal of Zoology Vol 71 85 88
8. Jara C. G. 1977 "Aegla rostrata n. sp. (Decapoda, Aeglidae), nuevo crustáceo dulceacuícola del Sur de Chile." Studies on Neotropical Fauna and Environment Vol 12 165 176
9. Jara C. G. 1982 "Aegla bahamondei, new species (Crustacea: Decapoda: Anomura) from the coastal mountain range of Nahuelbuta, Chile." Journal of Crustacean Biology Vol 2 232 238
10. Jara C. G. 1986 "Aegla spectabilis, a new species of freshwater crabs from the eastern slope of the Nahuelbuta Cordillera, Chile." Proceeding of the Biological Society of Washington Vol 99 34 41
11. Jara C. G. 1989 "Aegla denticulata lacustris, new subspecies, from Rupanco Lake, Chile (Crustacea: Decapoda: Anomura: Aeglidae)." Proceeding of the Biological Society of Washington Vol 102 385 393
12. Jara C. G. 1994 "Aegla pewenchae, a new species of central chilean freshwater decapod (Crustacea: Anomura: Aeglidae)." Proceeding of the Biological Society of Washington Vol 107 325 339
13. Jara C. G. 1999 "Two new species of Aegla Leach (Crustacea: Decapoda: Anomura: Aeglidae)." Proceeding of the Biological Society of Washington Vol 112 106 119
14. Jara C. G., López M. T. 1981 "A new species of freshwater crab (Crustacea: Anomura: Aeglidae) from insular south Chile." Proceeding of the Biological Society of Washington Vol 94 88 93
15. Lister B. C. 1976 "The nature of niche expansion in West Indian Anolis lizards I: ecological consequences of reduced competition." Evolution Vol 30 659 676
16. López M. 1965 "Estudios biológicos en Aegla odebrechtii paulensis Schimtt." Universidade de São Paulo, Faculdade de Filosophia, Ciências e Letras Vol 25 301 314
17. Lopretto E. C. 1978a "Las especies de Aegla Leach del centro-oeste argentino en base a la morfología comparada del quinto par de pereiópodos (Crustacea, Anomura, Aeglidae)." Neotropica Vol 24 71 57 68
18. Lopretto E. C. 1978b "Estructura exoesqueletaria y miología del quinto par de pereiópodos del macho de la familia Aeglidae (Crustacea Anomura)." Limnobios Vol 1 284 298
19. Lopretto E. C. 1979 "Estudio comparativo del quinto par de pereiópodos en los representantes del género Aegla de la República Argentina (Crustacea Anomura)." Neotropica Vol 25 9 22
20. Lopretto E. C. 1981 "Discusión sobre las presuntas subespecies de Dilocarcinus (D.) pagei (Crustacea Brachyura Trichodactylidae). Redescripción y referencia a su polifenismo." Physis Vol 39 97 21 31
21. Losos J. B., De Queiroz K. 1997 "Evolutionary consequences of ecological release in Caribbean Anolis lizards." Biological Journal of the Linnean Society Vol 61 459 483
22. Magalhães C., Türkay M. 1996 "Taxonomy of the neotropical freshwater crab family Trichodactylidae II. The genera Forsteria, Melocarcinus, Sylviocarcionus, and Zilchiopsis (Crustacea: Decapoda: Brachyura." Senckenbergiana Biologica Vol 75 97 130
23. Mardia K. V., Bookstein F. L., Moreton I. J. 2000 "Statistical assessment of bilateral symmetry of shape." Biometrika Vol 87 285 300
24. Martin J. W. 1984 "Natural history and morphology of aeglid crabs (Decapoda, Anomura) from Uruguay." American Zoologist Vol 24 217
25. Martin J. W., Abele L. 1988 "External morpholgy of the genus Aegla (Crustacea: Anomura: Aeglidae)." Smithsonian Contributions to Zoology Vol 453 1 46
26. Morrone J. J. 1996 "On the geographical distribution of the species of Aegla Leach: identification of areas of endemism (Decapoda: Aeglidae)." Biogeographica Vol 72 113 119
27. Nakata K., Goshima S. 2003 "Competiton for shelter of preferred sizes between the native crayfish species Cambaroides japonicus and the alien crayfish species Pacifastacus leniusculus in Japan in relation to prior residence, sex difference, and body size." Journal of Crustacean Biology Vol 23 897 907
28. Neiff J. J. 1996 "Large rivers of South America: toward the new approach." Verhandlugen International Vereinigung Limnologie Vol 26 167 180
29. Pérez-Losada M., Bond-Buckup G., Jara C., Crandal K. 2004 "Molecular systematic and biogeography of the South American freshwater “crabs” Aegla (Decapoda: Anomura: Aeglidae) using multiple heuristic tree search approaches." Systematic Biology Vol 53 767 780
30. Ringuelet R. 1948a "Una nueva Aegla del Nordeste Argentino (Decapoda, Anomura)." Notas Museo La Plata Vol 13 203 208
31. Ringuelet R. 1948b "Los “cangrejos” Argentinos del género Aegla de Cuyo y la Patagonia." Revista del Museo La Plata Vol 5 297 347
32. Ringuelet R. 1949a "Consideraciones sobre las relaciones filogenéticas entre las especies del Genero Aegla. Leach (Decapodos Anomuros)." Notas del Museo de La Plata, Zoología Vol 14 120 111 118
33. Ringuelet R. 1949b "Los anomuros del género Aegla del noroeste de la República Argentina." Revista del Museo La Plata (N.S.), Zoología Vol 6 36 1 45
34. Ringuelet R. 1949c "La prioridad en el estudio biométrico de los decápodos Anomuros del género Aegla Leach." Notas Museo La Plata Vol 14 119 121
35. Ringuelet R. 1959 "Notas sobre Aegla de Argentina y Paraguay (Crustacea, Decapoda, Anomura)." Phycis Vol 21 61 231 239
36. Ringuelet R. 1960 "Identificación de los crustáceos anomuros del género Aegla de la República de Bolivia. 1° Congreso Sudamericano de Zoología, La Plata." Actas y Trabajos Vol 3 2 245 249
37. Rohlf F. J. 2004a "tpsDig, version 1.40." Department of Ecology and Evolution, State University New York. Stony Brook
38. Rohlf F. J. 2004b "tpsUtil, Version 1.33." Copyright © 2004, Ecology & Evolution, SUNY at Stony Brook
39. Rohlf F. J. 2005 "tpsRelw, Version 1.42." Copyright © 2005, Ecology & Evolution, SUNY at Stony Brook
40. Rohlf F. J. 2004c "tpsRegr, version 1.29." Copyright © 2004, Ecology & Evolution, SUNY at Stony Brook
41. Rohlf F. J., Marcus L. F. 1993 "A revolution in morphometrics." Trends Ecology and Evolution Vol 8 129 132
42. Rohlf F. J., Slice D. E. 1999 "Extensions of the procrustes method for the optimal superimposition of landmarks." Systematic Zoology Vol 39 40 59
43. Schmitt W. 1942 "The species of Aegla, endemic South American fresh-water crustaceans." Proceedings of the United States National Museum Vol 91 431 520
44. Schoener T. W. 1986 "Resource partitioning." In, J. Kikkawa and D. J. Anderson (eds.), Community Ecology: Pattern and Process. Melbourne: Blackwell Scientific 91-126
45. Schuldt M., Nuñez P., Mersing W., Del Valle A., Mancediño y M. 1988 "Aegla (Crustacea, Anomura) en el lago Huechulafquen (Neuquén, Argentina) y algunas implicancias filogenéticas para Aeglidae del centro oeste de Argentina." Anales de la Sociedad Científica Argentina Vol 217 50 27 37
46. Slice D. E. 2000 Morpheus et al. Copyright © 1994-2000, Ecology & Evolution, SUNY at Stony Brook
47. Thompson D. W. 1917 "On Growth and Form." Cambridge: Cambridge University Press
48. Turra A., Leite F. P P. 2001 "Shell utilization patterns of a tropical rocky intertidal hermit crab assemblage: I. the case of grande beach." Journal of Crustacean Biology Vol 21 393 406
49. Vadeboncoeur Y., Vander Zanden M. J., Lodge D. M. 2002 "Putting the lake back together: reintegrating benthic pathways into lake food web models." Bioscience Vol 52 1 11
50. Vaz-Ferreira R., Gray R., Vaz-Ferreira y M. 1945 "Notas biométricas sobre los crustáceos decápodos del género Aegla Leach. I. La variación de algunas magnitudes en Aegla uruguayana Schmitt." Commuicaciones Zoologicas del Museo de Historia Natural de Montevideo Vol 1 24 1 6
51. Wetzel R. G. 2001 "Limnology. Lake and River Ecosystem." San Diego: Academic Press, third ed
52. Williamson S. L., Martínez Fontes y E. 1955 "Aegla franca Schmitt (Crust. Dec. Anomura) Ampliación de su distribución geográfica y estudio biométrico comparativo. Comunicaciones del Instituto Nacional de Investigación de as Ciencias Naturales, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”." Ciencias Zoológicas Vol 3 2 55 93
53. Williner V., Collins y P A. 2000 "¿Existe jerarquización en las poblaciones de Palemónidos del valle aluvial del Río Paraná?." Natura Neotropicalis Vol 31 53 60

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