IBIGEO   22622
INSTITUTO DE BIO Y GEOCIENCIAS DEL NOA
Unidad Ejecutora - UE
artículos
Título:
The Ontogeny of Pseudis platensis (Anura, Hylidae):Heterochrony and the Effects of Larval Development on Postmetamorphic Life
Autor/es:
FABREZI, MARISSA; QUINZIO, SILVIA INÉS; GOLDBERG, JAVIER
Revista:
JOURNAL OF MORPHOLOGY
Editorial:
WILEY-LISS, DIV JOHN WILEY & SONS INC
Referencias:
Año: 2010 vol. 271 p. 496 - 510
ISSN:
0362-2525
Resumen:
Recent studies have described the giant
tadpole, delayed metamorphic transformations, and absence
of postmetamorphic growth of the skeleton of Pseudis
Platensis. These features address questions about
derived patterns of life cycles and the role of the heterochrony
during the metamorphosis in anurans. Using anatomical
methods, we provide new data on the development
of reproductive, digestive and integument systems,
and age inference obtained from ontogenetic series of
Pseudis platensis. Our results indicate that at the end of
metamorphosis, the adult skin is completely differentiated,
including the calcified dermal layer; the testis has
seminiferous tubules with spermatogonia, spermatocytes,
and spermatids; ovarian sacs present previtellogenic ova;
and the adult digestive tract is fully formed. The froglets
differ from adults only in being unable to reproduce. The
entire life cycle of P. platensis can occur in 4 years. In the
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
metamorphosis, the adult skin is completely differentiated,
including the calcified dermal layer; the testis has
seminiferous tubules with spermatogonia, spermatocytes,
and spermatids; ovarian sacs present previtellogenic ova;
and the adult digestive tract is fully formed. The froglets
differ from adults only in being unable to reproduce. The
entire life cycle of P. platensis can occur in 4 years. In the
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
metamorphosis, the adult skin is completely differentiated,
including the calcified dermal layer; the testis has
seminiferous tubules with spermatogonia, spermatocytes,
and spermatids; ovarian sacs present previtellogenic ova;
and the adult digestive tract is fully formed. The froglets
differ from adults only in being unable to reproduce. The
entire life cycle of P. platensis can occur in 4 years. In the
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
. Our results indicate that at the end of
metamorphosis, the adult skin is completely differentiated,
including the calcified dermal layer; the testis has
seminiferous tubules with spermatogonia, spermatocytes,
and spermatids; ovarian sacs present previtellogenic ova;
and the adult digestive tract is fully formed. The froglets
differ from adults only in being unable to reproduce. The
entire life cycle of P. platensis can occur in 4 years. In the
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.
P. platensis can occur in 4 years. In the
first year, larval development, growth to adult size, and
gonad differentiation are completed. Long larval development
rather than size of the tadpoles seems to be
involved in the absence of juvenile stages.