Étude préliminaire sur la présence de diatomées sur les lichens

Bertrand, J.; Coste, Clother; Cohu, R. Le; Renon, Jean-Pierre; Éctor, Luc

doi:10.1080/23818107.2016.1156573

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…These habitats would more likely allow the attachment to woodpecker feathers compared with freshwater rocks. Aerial dispersal of freshwater diatoms may be more common than previously thought (Bertrand et al., 2016), constituting yet another possible route of attachment. Similarly, the rotifers and testate amebae now observed from strictly terrestrial group of birds are known previously known only from water‐associated birds (Green & Elmberg, 2014).…”

Section: Discussionmentioning

confidence: 95%

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Woodpeckers can act as dispersal vectors for fungi, plants, and microorganisms

Johansson

Kaasalainen

Rikkinen

2021

Ecology and Evolution

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Bird‐mediated dispersal is presumed to be important in the dissemination of many different types of organisms, but concrete evidence remains scarce. This is especially true for biota producing microscopic propagules. Tree‐dwelling birds, such as woodpeckers, would seem to represent ideal dispersal vectors for organisms growing on standing tree trunks such as epiphytic lichens and fungi. Here, we utilize bird natural history collections as a novel source of data for studying dispersal ecology of plants, fungi, and microorganisms. We screened freshly preserved specimens of three Finnish woodpecker species for microscopic propagules. Samples were taken from bird feet, and chest and tail feathers. Propagules were extracted using a sonication–centrifugation protocol, and the material obtained was studied using light microscopy. Diverse biological material was recovered from all specimens of all bird species, from all positions sampled. Most abundant categories of discovered biological material included bryophyte fragments, fungal spores, and vegetative propagules of lichens. Also, freshwater diatoms, bryophyte spores, algal cells, testate amebae, rotifers, nematodes, pollen, and insect scales were identified. The method developed here is applicable to living specimens as well, making it a versatile tool for further research. Our findings highlight the potential of bird‐mediated dispersal for diverse organisms and showcase the use of natural history collections in ecological research.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 97%

Woodpeckers can act as dispersal vectors for fungi, plants, and microorganisms

Johansson

Kaasalainen

Rikkinen

2021

Ecology and Evolution

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“…Diatoms form a group of eukaryotic microalgae found in all ecosystems, including the narrowest ones [ 1 , 2 ]. Diatoms contribute to around 20% of global carbon fixation [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Bioinformatics-Based Screening Approach for the Identification and Characterization of Lipolytic Enzymes from the Marine Diatom Phaeodactylum tricornutum

et al. 2023

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Oleaginous diatoms accumulate lipids of biotechnological interest when exposed to nutrient stress conditions such as nitrogen starvation. While accumulation mechanisms are well-known and have been engineered to improve lipid production, degradation mechanisms remain poorly investigated in diatoms. Identifying lipid-degrading enzymes is the initial step to understanding the catabolic processes. In this study, an in silico screening of the genome of Phaeodactylum tricornutum led to the identification of 57 putative triacylglycerol lipases (EC 3.1.1.3) grouped in 4 families. Further analysis revealed the presence of conserved domains and catalytic residues of lipases. Physico-chemical characteristics and subcellular localization predictions highlighted that a majority of these putative proteins are hydrophilic and cytosolic, suggesting they could be recruited to lipid droplets directly from the cytosol. Among the 57 identified putative proteins, three lipases were identified as possibly involved in lipophagy due to a potential vacuolar localization. The expression of the mRNA corresponding to the 57 proteins was then searched in 3 transcriptomic datasets obtained under nitrogen starvation. Nine genes were highly regulated and were considered as encoding enzymes with a probable important function in lipid catabolism. A tertiary structure prediction of these nine candidates yielded eight functional 3D models. Among those, two downregulated enzymes, Phatr3_J54974 and Phatr3_EG00720, were highlighted as good targets for future functional genomics and purification studies to investigate their role in lipid degradation.

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“…Microalgae form a diverse group of photosynthetic organisms living in almost all of Earth's ecosystems and ecological niches, like lichens (Bertrand et al, 2016) or mineral springs (Millan et al, 2020); most microalgae are, however, present in freshwater or marine aquatic habitats. Microalgae are of significant ecological and economic importance.…”

Section: Introduction: Microalgae Research Outlookmentioning

confidence: 99%