Effects of Water pH on Life History Parameters of a New Bosminid Cladocera: Bosmina (Bosmina) Tripurae (Korinek, Saha and Bhattachaya, 1999) in Laboratory Condition

Abstract

The effects of water pH on life history parameters of Bosmina tripurae have been studied to determine the most suitable water pH desired for the maximum growth and development of this newly discovered cladoceran species. The study was carried out under the laboratory condition at 20 ± 2°C. Five pH ranges 5.0 ± 0.2, 6.0 ± 0.2, 7.0 ± 0.2, 8.0 ± 0.2 and 9.0 ± 0.2 with six replicates for each pH consisting of one animal in each Petri dish (80 × 15 mm) were used for the study. 20 mL of respective test medium was maintained with Chlorella sp. (2 × 10 ± 0.03 cells mL) in each Petri dish throughout the experiment. Thirty (30) animals were observed daily to investigate different life history parameters like total life span, age at maturity, number of eggs, neonates and egg batches etc. at different condition. From the study it was found that acidic water (pH 5 ± 0.2) is more suitable for the culture of Bosmina tripurae in laboratory condition.

Crecimiento poblacional de Macrothrix spinosa alimentada con Chlorella sp.

“…En relación al pH, este es uno de los parámetros más importantes dentro del cultivo de cladóceros debido a que tiene un gran impacto en las tasas de sobrevivencia y la reproducción (Ghazy et al, 2011;Saha et al, 2017). Sobre el pH, Ghazy et al, (2011) consideran como rango óptimo de 7.9 a 8.3 para Daphnia magna.…”

“…A su vez, Rottman et al, (2011) afirman que pH superior a 9,5 inhibe la producción de Moina sp., y aseguran que el rango de pH en cultivo debe ajustarse entre 7 y 8. Saha et al, (2017) reportan que Bosmina tripurae alcanza menor tiempo en su madurez sexual a pH 8.0, pero fecundidad y sobrevivencia más alta y el menor periodo embrionario en pH de 5. De esta manera se puede inferir que el rango óptimo para el desarrollo de organismos zooplanctónicos es de 5 a 8, dependiendo de la especie en cultivo.…”

Environmental stressors alter multiple determinants of individual reproductive output in the acid‐tolerant mayfly Leptophlebia vespertina

“…Low pH is usually associated with calcium deficiency, which inhibits Daphnia reproduction due to an allocation trade‐off between somatic growth and reproduction (Ashforth & Yan, 2008; Giardini et al, 2015). Reproductive output of acidophilous and acid‐tolerant zooplankton species may however increase at lower pH (Saha et al, 2017), possibly due to competitive release (Locke & Sprules, 1993). In rotifers, egg mortality can also rise rapidly at low pH, especially in species that are more sensitive to acidification (Yin & Niu, 2008).…”