Influence of salinity on the life table demography of a rare Cladocera Latonopsis australis

Abstract

Latonopsis australis is a rare Cladocera inhabiting the entire stretch of the Cochin backwaters, the largest monsoonal estuary along the West Coast of India, during the summer monsoon, but restricted to the upper reaches during the non-monsoon periods. Here, we present the results of an experimental study, which assessed the influence of salinity on the life table demography of the species at different salinity levels. The life table demographic parameters such as net reproduction rate, generation time, intrinsic growth rate, gross reproductive rate, and survivorship of the species were measured in different salinities ranging from freshwater to mesohaline levels (salinity 14). The study showed that higher salinity had a significant negative effect on all life table demography parameters of the species, whereas freshwater to low saline conditions (salinity up to 8) favored the survivorship, life expectancy, net production, and growth rate. It was also noticed that salinity above 8 caused a significant decrease in the survivorship, life expectancy, and reproduction rate of the species, which clearly explained the seasonal distribution pattern of the species in the Cochin backwaters. The present study suggests salinity 2 to 6 as the optimum range for the large-scale production of L. australis for purposes like live feed in aquaculture.

Effect of Different Salinities Gradient on Fatty Acid Composition, Growth, Survival and Reproductive Performance of Moina macrocopa (Straus 1820) (Crustacea, Cladocera)

“…Salinity levels impact the intrinsic rate (births minus deaths) for M. macrocopa population. This claim was supported in similar research done byHaridevan et al (2015) where the intrinsic rate of Latonopsis australis decreased when the salinity levels of treatments increased. In the current study, life table parameters at salinity more than 8psu also cannot be reliable acquired because salinity higher than 8psu is beyond the toleration of M. macrocopa.…”

“…The previous study also showed that the number of offspring produce was the most affected parameters on the life table as caused by an increase of salinity for D. magna and D. longispina Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 21 June 2019 doi:10.20944/preprints201906.0205.v1 (Goncalves et al, 2007). Furthermore, in an observation-based study by Haridevan et al, (2015), the findings also showed that the offspring of Latonopsis australis were significantly influenced by high salinity. It is concluded that salinity clearly impacts reproduction of offspring of this cladoceran.…”

The effect of stress on rates of asexual reproduction in an invasive planarian

“…The flatworms were collected off the bottom of rocks with soft paint brushes. When brought to the laboratory, the planarians were housed individually in 90 mm Petri dishes and maintained in a climate-controlled cabinet at 15 °C (same as river) with 85% humidity to reduce evaporation, and no light since, like many planarians, G. tigrina is photophobic (Hinrichsen et al 2019 ; Fig. 1 ).…”

A Review on Different Zooplankton Culturing Techniques and Common Problems Associated with Declining Density

“…In addition, a previous study indicated that the offspring produced on the life table was the most affected parameters as induced by a rise in salinity for D. Magna, D. Longispina [86]. Haridevan et al (2015) also discovered that excessive salinity has a significant impact on the offspring of Latonopsis australis [87]. It is assumed that salinity specifically influences development of this cladoceran offspring.…”