19 research outputs found

    Table_1_The relationship between exercise intention and behavior of Chinese college students: A moderated mediation model.DOCX

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    Inconsistency between intention and behavior is very common in daily life. This study explored the intention-behavior relationship in exercise, focusing on the mediating effect of action planning and the moderating effects of habit strength and gender. For the purpose of providing theoretical reference for the implementation of intervention strategies in the volitional phase, a total of 489 college students (M-age = 20.61, 57.46% female) from Hubei Province, China, were recruited to complete the questionnaire at two time points. The findings showed that exercise intention could positively predict exercise behavior via the mediating effect of action planning, with the mediating effect accounting for 48.52% of the total effect. The predictive effect of action planning × habit strength interaction on exercise behavior was statistically significant. As individuals’ levels of habitual strength increased, so did the relationship between action plans and exercise behavior. The action planning-exercise behavior relationship was stronger in males than in females. In summary, action planning is a very important predictor of the post-intentional phase and has many advantages. For individuals whose exercise has become habitualized, forming a plan is not counterproductive and can still promote more exercise rather than in a mutually compensating manner.</p

    Sensitivity and Acclimation of Three Canopy-Forming Seaweeds to UVB Radiation and Warming

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    <div><p>Canopy-forming seaweeds, as primary producers and foundation species, provide key ecological services. Their responses to multiple stressors associated with climate change could therefore have important knock-on effects on the functioning of coastal ecosystems. We examined interactive effects of UVB radiation and warming on juveniles of three habitat-forming subtidal seaweeds from Western Australia–<i>Ecklonia radiata</i>, <i>Scytothalia dorycarpa</i> and <i>Sargassum sp</i>. Fronds were incubated for 14 days at 16–30°C with or without UVB radiation and growth, health status, photosynthetic performance, and light absorbance measured. Furthermore, we used empirical models from the metabolic theory of ecology to evaluate the sensitivity of these important seaweeds to ocean warming. Results indicated that responses to UVB and warming were species specific, with <i>Sargassum</i> showing highest tolerance to a broad range of temperatures. <i>Scytothalia</i> was most sensitive to elevated temperature based on the reduced maximum quantum yields of PSII; however, <i>Ecklonia</i> was most sensitive, according to the comparison of activation energy calculated from Arrhenius’ model. UVB radiation caused reduction in the growth, physiological responses and thallus health in all three species. Our findings indicate that <i>Scytothalia</i> was capable of acclimating in response to UVB and increasing its light absorption efficiency in the UV bands, probably by up-regulating synthesis of photoprotective compounds. The other two species did not acclimate over the two weeks of exposure to UVB. Overall, UVB and warming would severely inhibit the growth and photosynthesis of these canopy-forming seaweeds and decrease their coverage. Differences in the sensitivity and acclimation of major seaweed species to temperature and UVB may alter the balance between species in future seaweed communities under climate change.</p></div

    Phytoplankton in Lake Gjersjøen from 1969 to 1989 detected by high throughput sequencing of 16S rRNA (a) and 18S rRNA (b) hypervariable regions.

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    <p>Phytoplankton in Lake Gjersjøen from 1969 to 1989 detected by high throughput sequencing of 16S rRNA (a) and 18S rRNA (b) hypervariable regions.</p

    Light absorption spectra of <i>Ecklonia</i>, <i>Scytothalia</i> and <i>Sargassum</i> before incubation (original spectra) and after 14 days of cultivation at 16°C and 30°C, with (UVB (+)) or without (UVB (-)) UVB radiation.

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    <p>The spectra are averaged for all individuals (n = 2~6) in each treatment. Photos illustrate transitions from “healthy” to “unhealthy” status: discoloration from brown to green for <i>Ecklonia</i>, <i>Scytothalia</i>; and becoming darker from brown to black for <i>Sargassum</i>.</p

    Maximum quantum yield values (mean ± standard error) measured on dark-adapted <i>Ecklonia</i>, <i>Scytothalia</i> and <i>Sargassum</i>, after 0, 2, 7, 10 and 14 days of cultivation at temperatures from 16 to 30°C, left: no UVB radiation; right: exposed to UVB radiation.

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    <p>Maximum quantum yield values (mean ± standard error) measured on dark-adapted <i>Ecklonia</i>, <i>Scytothalia</i> and <i>Sargassum</i>, after 0, 2, 7, 10 and 14 days of cultivation at temperatures from 16 to 30°C, left: no UVB radiation; right: exposed to UVB radiation.</p
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