Abstract
The effect of different total dissolved solid levels (TDS) was investigated as a predictor of diapause induction in the calanoid copepod Aglaodiaptomus leptopus. We collected adult copepods in the field and monitored seasonal changes in diapause egg production. We determined total dissolved solid levels, conductivity and temperature values from five ponds. In experimental work, females bearing clutches, collected from the field, were monitored under laboratory conditions to determine the extent of diapause induced. Females without clutches were placed with males and then subjected to low, medium and high TDS levels. After six days, females bearing clutches were isolated to determine the proportion of clutches that were diapausing. The relationship between TDS and food levels was calculated using Williamson and Butler’s food limitation index (f). We concluded that neither TDS nor temperature are predictors of the induction of diapause in this study. The obtained results suggest, however, that density possibly plays a role in predicting diapause induction.
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Di Lonardo, S.S., Maly, E.J. Dissolved solids do not induce diapause in the calanoid copepod Aglaodiaptomus leptopus . Aquatic Ecology 38, 425–432 (2004). https://doi.org/10.1023/B:AECO.0000035176.77771.06
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DOI: https://doi.org/10.1023/B:AECO.0000035176.77771.06