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Zhang P.,Dalian Ocean University | Zhang P.,Key Laboratory of Hydrobiology in Liaoning Province | Sun J.,Dalian Ocean University | Wang S.,Dalian Ocean University | And 3 more authors.
Hydrobiologia | Year: 2016

The terrestrialization success of aquatic organisms requires physiological adaptations, of which water loss restraint, respiratory, and osmoregulatory systems are notably critical. Isopods of the genus Ligia (Oniscidea) have a particular significance for understanding the evolutionary transition of crustaceans from marine to terrestrial/freshwater environments. The main aim of this study was to analyze whether Ligia cinerascens as a supralittoral species has the potential for inland migration and colonization based on its performance of survival under desiccation, submergence, and salinity change. The change of body weight and survival time in desiccation experiments was measured and calculated for the loss of body water and water-specific rate of water loss. The survival of individuals submerged in the seawater (33 ppt) and different salinities of water (0, 10, 30, 50, 70, 90 ppt) was recorded. Salinity acclimation experiments were then conducted with or without food provision. The larger individuals exhibited stronger desiccation tolerance but poorer ability against submergence. Ligia cinerascens could survive the lower water salinity (0, 10, 30 ppt), especially when adequate food was provided. This work suggests the high potential of inland migration and colonization in L. cinerascens based on its strong desiccation tolerance and freshwater adaptation. © 2016 Springer International Publishing Switzerland

Zhang P.,Dalian Ocean University | Zhang P.,Key Laboratory of Hydrobiology in Liaoning Province | Zhang P.,Dalian Bio Engineering Technology Company Postdoctoral Research Center | Sun J.,Dalian Ocean University | And 10 more authors.
Marine Environmental Research | Year: 2013

The present study established an experimental marine food chain of three levels (microalgae→zooplankton→fish) to investigate the effect of feeding selectivity on the transfer of methylmercury (MeHg) through the food chain. Total Hg concentrations in Chlorella sp., Nitzschia closterium and Isochrysis galbana exposed to 1μgL-1 MeHg for three days were 27.91, 32.74 and 40.03μgg-1 respectively and were significantly different (p<0.05) between species. Moina mongolica and Artemia sp. primarily selected Chlorella sp. as the sole diet, though the Artemia sp. partly grazed on I.galbana as well. Harpacticus uniremis, however, preferred to graze N.closterium and I.galbana and avoided Chlorella sp.The varying concentration of Hg in the microalgae species as well as the selectivity of zooplankton to the algal diet resulted in varying Hg accumulation in three zooplankton species (M.mongolicaP.olivaceus>F.rubripes with total Hg concentrations of 0.0042, 0.0031 and 0.0020μgg-1, respectively). These investigations suggested feeding selectivity plays a key role in the transfer of MeHg along marine food chains. © 2013 Elsevier Ltd.

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