INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Sexual maturity and ontogenetic shape variations in the freshwater anomuran crab, Aegla uruguayana (Decapoda, Aeglidae).
Autor/es:
COLLINS PABLO AGUSTIN; GIRI FEDERICO; WILLINER VERONICA
Revista:
INVERT. REPROD. DEVELOP.
Editorial:
NTERNATIONAL SOCIETY OF INVERTEBRATE REPRODUCTION & DEVELOPMENT
Referencias:
Lugar: Balaban; Año: 2008 vol. 52 p. 113 - 119
ISSN:
0792-4259
Resumen:
Sexual maturity is marked by morphological changes in freshwater anomuran crabs. Specific
modifications to the dorsal and ventral forms of the cephalothorax and the coxa of the fifth
pereiopod in males indicate reproductive maturity. Here, we describe changes in cephalothorax and
coxa that develop during sexual maturity in the freshwater anomuran, Aegla uruguayana. To
evaluate shape, the dorsal and ventral cephalothorax and the coxa of the fifth pereiopod of this
species were digitally photographed. With specific landmarks as reference points, the crab shape
was analyzed for each of the three body parts. Relative warps analysis were performed revealing
shape differences among the size forms and sexes. The dorsal cephalothorax and the coxa of the
fifth pereiopod are different between juveniles, males and females. Individuals of 1216 mm
cephalothorax length have a shape closest to the consensus configuration in the population,
which is correlated with the onset of sexual maturity in males. Additionally, there are size and
shape differences among juveniles and adult individuals of the population. The shape differences
were observed mainly in the coxa of the fifth pereiopod of males, as the length of the sexual tube
increases during sexual development. Moreover, sexual maturity occurred simultaneously with
cephalothorax and coxa development. These results show that multiple cohorts of A. uruguayanaAegla uruguayana. To
evaluate shape, the dorsal and ventral cephalothorax and the coxa of the fifth pereiopod of this
species were digitally photographed. With specific landmarks as reference points, the crab shape
was analyzed for each of the three body parts. Relative warps analysis were performed revealing
shape differences among the size forms and sexes. The dorsal cephalothorax and the coxa of the
fifth pereiopod are different between juveniles, males and females. Individuals of 1216 mm
cephalothorax length have a shape closest to the consensus configuration in the population,
which is correlated with the onset of sexual maturity in males. Additionally, there are size and
shape differences among juveniles and adult individuals of the population. The shape differences
were observed mainly in the coxa of the fifth pereiopod of males, as the length of the sexual tube
increases during sexual development. Moreover, sexual maturity occurred simultaneously with
cephalothorax and coxa development. These results show that multiple cohorts of A. uruguayanaA. uruguayana
coexist in the population and that individuals can have a different reproductive capacity within the
active sexual population.