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The size at maturity was studied in the crab Aegla uruguayana from the Areco River (31°14′ S, 59°28′ W), Argentina. Size at sexual maturity was determined according to three criteria: morphometric (change in the relative growth of reproductive characters), histological (first maturation of gonads) and functional (capability to mate and carry eggs). Regarding females, morphometric maturity occurred at a carapace length (CL) of 11.50 mm, considering abdomen width as a reproductive character. Gonad maturity of females could be observed at a minimum size ranging from 15 to 17 mm CL. The smallest ovigerous female observed in the field was 15.60 mm CL, although a relevant population incidence of ovigerous females (86.6%) has just been observed at values higher than 17 mm CL. As for males, the relative growth of the left chela length changed at a value of 15.40 mm CL, while morphological changes in sexual tube occurred between CL of 14 and 16 mm. Testicular maturation occurred at a CL ranging from 17 to 19 mm. The smallest size of males having spermatozoids in their vasa deferentia was 18.70 mm CL. The results obtained indicated that, in both sexes, functional maturity occurred after morphometric maturity and at a size similar to that of gonad maturity. Comparing sexes, females acquired sexual maturity (morphometric, gonad and functional maturity) at sizes statistically smaller than those of males. © 2006 The Authors.


Documento: Artículo
Título:Size at the onset of sexual maturity in the anomuran crab, Aegla uruguayana (Aeglidae)
Autor:Viau, V.E.; López Greco, L.S.; Bond-Buckup, G.; Rodríguez, E.M.
Filiación:Department of Biodiversity and Experimental Biology, University of Buenos Aires, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
Departamento de Zoologia, Instituto de Biociencias, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Avenue Paulo Gama 40, 90040-060, Porto Alegre, RS, Brazil
Palabras clave:Aegla uruguayana; Reproduction and growth; Sexual maturity; body size; comparative study; crab; female behavior; field method; histology; male behavior; morphometry; population size; reproductive behavior; sexual maturity; Areco River; Argentina; Buenos Aires [Argentina]; South America; Aegla uruguayana; Aeglidae; Decapoda (Crustacea)
Página de inicio:253
Página de fin:264
Título revista:Acta Zoologica
Título revista abreviado:Acta Zool.


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---------- APA ----------
Viau, V.E., López Greco, L.S., Bond-Buckup, G. & Rodríguez, E.M. (2006) . Size at the onset of sexual maturity in the anomuran crab, Aegla uruguayana (Aeglidae). Acta Zoologica, 87(4), 253-264.
---------- CHICAGO ----------
Viau, V.E., López Greco, L.S., Bond-Buckup, G., Rodríguez, E.M. "Size at the onset of sexual maturity in the anomuran crab, Aegla uruguayana (Aeglidae)" . Acta Zoologica 87, no. 4 (2006) : 253-264.
---------- MLA ----------
Viau, V.E., López Greco, L.S., Bond-Buckup, G., Rodríguez, E.M. "Size at the onset of sexual maturity in the anomuran crab, Aegla uruguayana (Aeglidae)" . Acta Zoologica, vol. 87, no. 4, 2006, pp. 253-264.
---------- VANCOUVER ----------
Viau, V.E., López Greco, L.S., Bond-Buckup, G., Rodríguez, E.M. Size at the onset of sexual maturity in the anomuran crab, Aegla uruguayana (Aeglidae). Acta Zool. 2006;87(4):253-264.