IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Experimental evaluation on survival mechanism of the invader
Autor/es:
BERASATEGUI, A. A.; HOFFMEYER M.S.; DUTTO, M.S.
Lugar:
Porto
Reunión:
Conferencia; BIOLIEF; 2009
Institución organizadora:
CIIMar
Resumen:
Benthic resting eggs constitute a survival mechanism for Eurytemora americanaEurytemora americana which has a short pulse as planktonic phase. Its phylogenetic relationship with E. affinis seems to indicate that E. americana produces diapause eggs as a benthic phase. To study dormancy period, benthic eggs were incubated by simulating temperature and salinity in situ conditions all along the population pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. benthic phase. To study dormancy period, benthic eggs were incubated by simulating temperature and salinity in situ conditions all along the population pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. seems to indicate that E. americana produces diapause eggs as a benthic phase. To study dormancy period, benthic eggs were incubated by simulating temperature and salinity in situ conditions all along the population pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. in situ conditions all along the population pulse from June to November, 2007. It was observed that resting eggs began to appear in the sediment when population abundance was found highest. The number of eggs (frequently found in groups) in the sediment increased gradually as the declining population period advanced. The first nauplii appeared at 17 °C with 30-33 of salinity after a refractory warming period (19- 21°C and hypersaline conditions of 33-35 during 5 months).The maximum number of hatchings was recorded at 15-17°C and 30-33.9 of salinity. A negative relationship trend between hatching success and temperature was observed. Taken together, our results indicate that E. americana produces diapausal eggs. diapausal eggs. E. americana produces diapausal eggs.