Demographic and competition studies on Brachionus ibericus and Proales similis in relation to salinity and algal (Nannochloropsis oculata) density
Por:
Rebolledo U.A., Nandini S., Sarma S.S.S., Reyes J.C.R., Montes de Oca G.A.R.
Publicada:
1 abr 2018
Resumen:
We isolated the rotifers Brachionus ibericus and Proales similis from the sediment of shrimp tanks and studied their individual demographic characters and competition between them at two food levels (0.25 × 106, 1.00 × 106 cells ml-1 of Nannochloropsis oculata at 25 °C) and salinities ranging from 10 to 30‰. Our hypothesis was that growth rates would be higher with increasing food levels and salinities. Observations were taken twice a day for life table studies and daily once for population growth experiments. Using survivorship and fecundity data, we derived various life history variables. Although the average life span (7.6 ± 0.4 days) and gross reproductive rate (33.8 ± 2.9 neonate female-1 day-1) of B. ibericus were higher than those of P. similis (average life span 5.4 ± 0.6 days and gross reproductive rate 13.0 ± 0.6 neonate female-1 day-1), the population growth experiments showed that P. similis had higher r values (0.32 ± 0.005 day-1) than B. ibericus (0.23 ± 0.002 day-1) at 1.0 × 106 cells ml-1 of N. oculata. The rotifer P. similis was more adversely affected due to the presence of B. ibericus than vice versa. The data are important for developing techniques for a large-scale culture of these rotifers as food in aquaculture. © 2018, Springer International Publishing AG, part of Springer Nature.
Filiaciones:
Rebolledo U.A.:
Doctorado en Ciencias en Recursos Acuáticos, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Mazatlán, Sinaloa, Mexico
Nandini S.:
Laboratorio de Zoología Acuática, División de Investigación y Posgrado, Universidad Nacional Autónoma de México, Campus Iztacala, Av. de los Barrios # 1, Los Reyes Iztacala, Tlalnepantla, Estado de México, Mexico
Sarma S.S.S.:
Laboratorio de Zoología Acuática, División de Investigación y Posgrado, Universidad Nacional Autónoma de México, Campus Iztacala, Av. de los Barrios # 1, Los Reyes Iztacala, Tlalnepantla, Estado de México, Mexico
Reyes J.C.R.:
Laboratorio de Reproducción y Cultivo de Peces, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen s/n, Mazatlán, Sinaloa, Mexico
Montes de Oca G.A.R.:
Laboratorio de Reproducción y Cultivo de Peces, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen s/n, Mazatlán, Sinaloa, Mexico
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