Effects of temperature and salinity on growth ofThalassiosira pseudonana(Bacillariophyceae) isolated from ballast water

Abstract

We examined the impacts of environmental factors on the survival of ballast water-introduced planktonic organisms and specifically described the effects of temperature and salinity on growth of the centric diatom Thalassiosira pseudonana. In salinity gradient experiments for natural phytoplankton communities of the vessel Daewoo Diamond, several freshwater and marine species were successfully identified. Of these, T. pseudonana was the dominant species in all salinity conditions (2-30 psu). In combination experiments of temperature and salinity with a T. pseudonana monoculture, the organism did not grow between 5 C and 10 C in freshwater culture media but exhibited growth at low temperature (5 C) in brackish and marine waters. Furthermore, the T. pseudonana population grew significantly with increasing of temperature (10-30 C) in brackish and marine waters. Our results indicate that T. pseudonana is well adapted to euryhaline and eurythermal conditions and its viability is suitable for successful colonization into local Korean aquatic ecosystems.

Influences of temperature and salinity on physicochemical properties and toxicity of zinc oxide nanoparticles to the marine diatom Thalassiosira pseudonana

“…pseudonana attained a maximum growth rate at 20–25 °C (Fig. S3 , SI), which is consistent with results of studies with other organisms 10 , 30 . Upper thermal limit for growth of T .…”

“…Comparatively, as shown in this study, growth of diatoms was more affected by temperature than by salinity. Temperature is a dominant accessory factor controlling the growth of aquatic organisms, such as microalgae, fish and cladocerans 10 , 30 , 42 , 43 . In this study, 96-h IC50s of ZnO-NPs for T .…”

“…The marine diatom T . pseudonana was used as the test organism because it is distributed worldwide and can adapt to a wide range of temperatures and salinities 10 . Its genome sequence is available 11 , allowing study of molecular mechanisms of toxicity of ZnO-NPs to T .…”

High throughput cultivation-based screening on porous aluminum oxide chips allows targeted isolation of antibiotic resistant human gut bacteria

“…T . pseudonana has been shown to grow at a wide range of salinities and temperatures [52], and to have anaerobic capabilities [53].…”

Physiological adjustments and transcriptome reprogramming are involved in the acclimation to salinity gradients in diatoms

“…For example, salinity level has been shown to affect the spatial distribution of benthic diatoms by modifying their migratory behavior or favoring a drifting strategy (Underwood et al ., ; Sauer et al ., ; Araujo et al ., ). Field and laboratory experiments have also shown that salinity alone or in combination with other physicochemical factors can impact diatom growth (Baek et al ., ; Sogaard et al ., ) and cell size (De Miranda et al ., ), induce changes in photosynthesis and primary production (Radchenko and Il'iash, ; Osborn and Hook, ), elicit oxidative stress responses (Rijstenbil, ; Zhang et al ., ) and induce changes in the morphology of the diatoms' silica shell (frustules; Vrieling et al ., ; Martin‐Cereceda and Cox, ; Trobajo et al ., ; Ligowski et al ., ; Leterme et al ., ). Variation in salinity level can also influence the production of dimethylsulfoniopropionate (Lyon et al ., ; Kettles et al ., ), a biogenic precursor of a climatically active sulfur compound that is involved in cloud formation.…”