INVESTIGADORES
DIMA Jimena Bernadette
artículos
Título:
Schedule of the reprodutive events and maturity at size of the Patagonian stone crab Platyxanthus patagonicus (Brachyura, Platyxanthidae)
Autor/es:
G.A LEAL, J.B. DIMA, F.G.DELLATORRE & P.J BARÓN
Revista:
JOURNAL OF CRUSTACEAN BIOLOGY
Editorial:
allen press
Referencias:
Lugar: Virginia Beach; Año: 2008 vol. 2 p. 262 - 269
ISSN:
0278-0372
Resumen:
The most significant events of the reproductive cycle of the Patagonian stone crab,
Platyxanthus patagonicus, were studied in specimens sampled in northern Patagonian gulfs
from August 2004 to May 2006. Male and female crabs were assigned to stages of a scale of
gonad maturity. Females were also classified according to the presence/absence of embryos
on the pleopods and of spermatic content in the spermathecae. Ogives were fitted to maturity
at size data. The highest frequency of pre-ovigerous females and spermathecae with hardened
seminal contents occurred during the fall and winter. Fifty percent of the females reached
ovarian maturity at 66.4 mm CW. Ovigerous females were frequent from mid-fall to midspring,
peaking during early winter and mid-spring, and were unusual or absent during the
2
summer months. Post-ovigerous females were present in samples in all months but May and
June 2005, being frequent from late-spring to early-fall. Specimens with spent ovaries were
common in all seasons but summer, while those with mature or recovering ovaries were
present in samples taken in all months but August 2004 and May-June 2005. Fifty percent of
the males reached testes maturity at 54.7 mm CW. Males larger than this size showed mature
gonads year round, but a pulse of individuals with recovering testes was observed during the
winter of 2005 and early-fall of 2006. Our results show that mating occurs during the fall
months, spawning and embryonic incubation extends from fall to early spring, and hatching
takes place during late-spring and early-summer.
from August 2004 to May 2006. Male and female crabs were assigned to stages of a scale of
gonad maturity. Females were also classified according to the presence/absence of embryos
on the pleopods and of spermatic content in the spermathecae. Ogives were fitted to maturity
at size data. The highest frequency of pre-ovigerous females and spermathecae with hardened
seminal contents occurred during the fall and winter. Fifty percent of the females reached
ovarian maturity at 66.4 mm CW. Ovigerous females were frequent from mid-fall to midspring,
peaking during early winter and mid-spring, and were unusual or absent during the
2
summer months. Post-ovigerous females were present in samples in all months but May and
June 2005, being frequent from late-spring to early-fall. Specimens with spent ovaries were
common in all seasons but summer, while those with mature or recovering ovaries were
present in samples taken in all months but August 2004 and May-June 2005. Fifty percent of
the males reached testes maturity at 54.7 mm CW. Males larger than this size showed mature
gonads year round, but a pulse of individuals with recovering testes was observed during the
winter of 2005 and early-fall of 2006. Our results show that mating occurs during the fall
months, spawning and embryonic incubation extends from fall to early spring, and hatching
takes place during late-spring and early-summer.
from August 2004 to May 2006. Male and female crabs were assigned to stages of a scale of
gonad maturity. Females were also classified according to the presence/absence of embryos
on the pleopods and of spermatic content in the spermathecae. Ogives were fitted to maturity
at size data. The highest frequency of pre-ovigerous females and spermathecae with hardened
seminal contents occurred during the fall and winter. Fifty percent of the females reached
ovarian maturity at 66.4 mm CW. Ovigerous females were frequent from mid-fall to midspring,
peaking during early winter and mid-spring, and were unusual or absent during the
2
summer months. Post-ovigerous females were present in samples in all months but May and
June 2005, being frequent from late-spring to early-fall. Specimens with spent ovaries were
common in all seasons but summer, while those with mature or recovering ovaries were
present in samples taken in all months but August 2004 and May-June 2005. Fifty percent of
the males reached testes maturity at 54.7 mm CW. Males larger than this size showed mature
gonads year round, but a pulse of individuals with recovering testes was observed during the
winter of 2005 and early-fall of 2006. Our results show that mating occurs during the fall
months, spawning and embryonic incubation extends from fall to early spring, and hatching
takes place during late-spring and early-summer.
from August 2004 to May 2006. Male and female crabs were assigned to stages of a scale of
gonad maturity. Females were also classified according to the presence/absence of embryos
on the pleopods and of spermatic content in the spermathecae. Ogives were fitted to maturity
at size data. The highest frequency of pre-ovigerous females and spermathecae with hardened
seminal contents occurred during the fall and winter. Fifty percent of the females reached
ovarian maturity at 66.4 mm CW. Ovigerous females were frequent from mid-fall to midspring,
peaking during early winter and mid-spring, and were unusual or absent during the
2
summer months. Post-ovigerous females were present in samples in all months but May and
June 2005, being frequent from late-spring to early-fall. Specimens with spent ovaries were
common in all seasons but summer, while those with mature or recovering ovaries were
present in samples taken in all months but August 2004 and May-June 2005. Fifty percent of
the males reached testes maturity at 54.7 mm CW. Males larger than this size showed mature
gonads year round, but a pulse of individuals with recovering testes was observed during the
winter of 2005 and early-fall of 2006. Our results show that mating occurs during the fall
months, spawning and embryonic incubation extends from fall to early spring, and hatching
takes place during late-spring and early-summer.
were studied in specimens sampled in northern Patagonian gulfs
from August 2004 to May 2006. Male and female crabs were assigned to stages of a scale of
gonad maturity. Females were also classified according to the presence/absence of embryos
on the pleopods and of spermatic content in the spermathecae. Ogives were fitted to maturity
at size data. The highest frequency of pre-ovigerous females and spermathecae with hardened
seminal contents occurred during the fall and winter. Fifty percent of the females reached
ovarian maturity at 66.4 mm CW. Ovigerous females were frequent from mid-fall to midspring,
peaking during early winter and mid-spring, and were unusual or absent during the
2
summer months. Post-ovigerous females were present in samples in all months but May and
June 2005, being frequent from late-spring to early-fall. Specimens with spent ovaries were
common in all seasons but summer, while those with mature or recovering ovaries were
present in samples taken in all months but August 2004 and May-June 2005. Fifty percent of
the males reached testes maturity at 54.7 mm CW. Males larger than this size showed mature
gonads year round, but a pulse of individuals with recovering testes was observed during the
winter of 2005 and early-fall of 2006. Our results show that mating occurs during the fall
months, spawning and embryonic incubation extends from fall to early spring, and hatching
takes place during late-spring and early-summer.