IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Influence of experimental thermal shifts and overcrowding on fecundity in wild females of Acartia tonsa of the Bahía Blanca estuary
Autor/es:
BERASATEGUI, A. A.; LOPÉZ ABATE, M. C.; BIANCALANA, F.; HOFFMEYER, M. S.
Revista:
BRAZILIAN JOURNAL OF OCEANOGRAPHY
Editorial:
INST OCEANOGRAFICO
Referencias:
Lugar: São Paulo; Año: 2014 vol. 63 p. 201 - 207
ISSN:
1679-8759
Resumen:
The copepod Acartia tonsa plays an important role in the food web of many estuaries influenced by
changes due to anthropic activities, hence it is relevant to know its reproductive plasticity
under stressful conditions. We examined the influence of thermal shift (6 ± 1ºC and 18 ± 1ºC) and
overcrowding stress on egg production and hatching success in wild females of A. tonsa of the Bahía
Blanca Estuary. Egg production rate (EP), hatching success during seven days (E7 %) and time taken
to hatch 50 % of eggs (T 50) were registered. Th e high individual density used in the incubations
caused a decrease in EP values at both temperatures. Nevertheless, all the females responded
favorably to 18°C. EP and E7 % obtained at both temperatures were significantly different the values
at 18ºC, being twice as high as those obtained at 6°C. T 50 values at 18ºC indicated a shorter
developmental time in eggs from spring females, whereas the opposite effect was observed in eggs
from winter females. Our results indicate that the reproductive performance is affected by short
exposures to thermal shift. The pattern of egg production and hatching is also modified in accordance
with the maternal history.