Biology subjects

Permentier, T.

Publications and source records attributed to Permentier, T..

3 recordsLinked to original sources

bioRxiv2025

Proteomic insights into the photobiology of the Hawaiian rice coral Montipora capitata in response to decreased light intensity

Reef-building corals are sessile marine organisms that inhabit a wide range of light habitats along depth gradients. As coral biology is often studied in the context of global change and changing temperatures, knowledge gaps persist in our understanding of the molecular and cellular pathways involved in the responses to other factors than temperature, such as light intensity, which decreases exponentially in the water column and gradually changes the environment. To fill this gap, we tested the response of the Hawaiian rice coral Montipora capitata to decreased light intensity in a field experiment in K[a]neohe Bay, Oahu, Hawaii, using Data-Independent Acquisition (DIA) proteomics. There was a significant effect of light intensity on both the coral and zooxanthellae proteomes. In the M. capitata host, 69 proteins differed significantly in abundance between light levels after two years. The 50 proteins identified as significantly more abundant in the control condition were mostly involved in mRNA and RNA processing, pointing toward a positive correlation between metabolic activity, growth rates and increased light levels. The 19 proteins identified as significantly more abundant in the shade treatment were associated with calcium transport and with the structure of key cellular components, such as cell membrane and cytoskeleton. By contrast, zooxanthellae showed only minor changes in protein abundances, with photosynthesis proteins more abundant in the shade treatment and enzymes involved in fatty acid metabolism more abundant in the control treatment. Overall, these findings establish a baseline for our understanding of the cellular and metabolic processes driving Montipora capitatas acclimatization potential to different light intensities.

ecology↗

bioRxiv2024

An in-depth dataset of northwestern European arthropod life histories and ecological traits

In response to the ongoing biodiversity crisis among arthropods, it is essential to implement efficient conservation strategies to safeguard both species diversity and the vital ecosystem services they provide. Developing such strategies requires reliable predictive models that can identify the species that are the most vulnerable to current and future threats, including those posed by climate and land-use change. Species life histories are central to these models, as they influence both population dynamics and spread rates. To support this effort, we compiled a dataset with key traits for arthropods based on several literature sources and expert knowledge. The dataset contains data on body size, life history, thermal niche and ecology for 4874 northwestern European species across 10 different orders. By gathering these essential trait data, we aim to create a robust foundation for predicting species vulnerability and anticipating shifts in arthropod communities in response to global change.

ecology↗

bioRxiv2024

Shading does not lower thermal tolerance in the coral Montipora capitata: implications for conservation intervention

Marine heatwaves trigger severe coral bleaching events that result in dramatic losses of coral reefs worldwide. An increasingly common method used to mitigate coral bleaching is to shade portions of reefs. However, as shaded corals become less exposed to environmental stress, shading has also been hypothesized to lower their thermal tolerance, which would be detrimental for their survival. Here, we investigated how long-term shading modifies the response of Montipora capitata to both light and temperature stressors. After two years of growth, we used the Coral Bleaching Automated Stress System (CBASS) to compare responses of 73% shaded and unshaded corals during 1) temperature stress under ambient light, 2) temperature stress under low light, and 3) ambient temperature with light stress. Results show that shaded corals are less resistant than control ones to light stress and to heat stress under high light, but not to heat stress under low light, where no difference was detected. We further demonstrate that low light intensity during heat stress reduces the decline of photosynthetic efficiency when compared to heat stress at ambient light, regardless of the light history of the coral colonies. Our data support light-mediated stress, both independent of and synergistic with heat-induced stress, and suggest that light and heat stresses trigger different molecular and cellular pathways. We hereby confirm the benefits of coral shading under both short- and long-term temperature stress, and underline the importance of light acclimation in the conservation and restoration of coral reefs.

ecology↗