CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
artículos
Título:
Effect of temperature, photoperiod, flooding, and drying on the hatching pattern of the eggs of Strelkovimermis spiculatus (Nematoda: Mermithidae).
Autor/es:
MICIELI, M. V.; RISSO, P.; ACHINELLY, M. F; VILLAR, M. DE LOS M.; TARQUINI, J.
Revista:
JOURNAL OF INVERTEBRATE PATHOLOGY
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2012 vol. 110 p. 114 - 117
ISSN:
0022-2011
Resumen:
We assessed the number of Strelkovimermis spiculatus
preparasites obtained from a known initial number of nematode eggs and the
effect of abiotic conditions (temperature, photoperiod, flooding-drying) on the
number of emerged preparasites. Two egg groups were
maintained: one continuously flooded, another with flooding-drying cycles (every 15, 30, 60 days). Each egg group was studied at 25 ºC and 14:10
(L:D) and 16 ºC and 12:12 (L:D). The flooded
eggs contained a higher overall percentage of S. spiculatus preparasites compared to the wet-dry-cycle eggs.
The conditions of continuous flooding at 16 ºC and 12:12
(L:D) produced the maximum percent of emerged J2s (30 ± 15%). Preparasites were
recorded by 7 (25 ºC) and 14 (16 ºC) days, suggesting this period as the
minimum time for embryonic development. The preparasite-emergence time observed
from the same flooded-egg batch (98 and 112 days at 25 ºC and 16 ºC,
respectively) suggested a nonsychronous hatching, possibly through nonuniform
egg embryonation. The time of exposure todrought in the assays did not
significantly affect the total average percentage of J2s obtained at 25 ºC and 14:10 (L:D), whereas at 16 ºC the number of
emerged J2s diminished with a prolongation of the drying period. The
oviposition period was also recorded only at 16 ºC
and 12:12 (L:D): S. spiculatus
eggs were detected at 12.6 days after postparasite emergence, and oviposition
was complete at 51 days under those conditions. We propose a flooding schedule
to optimize the mass-rearing of S.
spiculatus.