Publications by authors named "F X Grandjean"

148 Publications

Advancing biological invasion hypothesis testing using functional diversity indices.

Sci Total Environ 2022 Aug 8;834:155102. Epub 2022 Apr 8.

Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 - UMR 8204 - CIIL - Center for Infection and Immunity of Lille, F-59000 Lille, France.

Pioneering investigations on the effects of introduced populations on community structure, ecosystem functioning and services have focused on the effects of invaders on taxonomic diversity. However, taxonomic-based diversity metrics overlook the heterogeneity of species roles within and among communities. As the homogenizing effects of biological invasions on community and ecosystem processes can be subtle, they may require the use of functional diversity indices to be properly evidenced. Starting from the listing of major functional diversity indices, alongside the presentation of their strengths and limitations, we focus on studies pertaining to the effects of invasive species on native communities and recipient ecosystems using functional diversity indices. By doing so, we reveal that functional diversity of the recipient community may strongly vary at the onset of the invasion process, while it stabilizes at intermediate and high levels of invasion. As functional changes occurring during the lag phase of an invasion have been poorly investigated, we show that it is still unknown whether there are consistent changes in functional diversity metrics that could indicate the end of the lag phase. Thus, we recommend providing information on the invasion stage under consideration when computing functional diversity metrics. For the existing literature, it is also surprising that very few studies explored the functional difference between organisms from the recipient communities and invaders of the same trophic levels, or assessed the effects of non-native organism establishment into a non-analogue versus an analogue community. By providing valuable tools for obtaining in-depth diagnostics of community structure and functioning, functional diversity indices can be applied for timely implementation of restoration plans and improved conservation strategies. To conclude, our work provides a first synthetic guide for their use in hypothesis testing in invasion biology.
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http://dx.doi.org/10.1016/j.scitotenv.2022.155102DOI Listing
August 2022

[Post-traumatic ileal branch pseudoaneurysm].

Rev Med Liege 2022 Apr;77(4):199-201

Service de Radiologie et d'Imagerie Médicale, CHC MontLégia, Liège, Belgique.

Arterial aneurysms of visceral branches are rare, even more if they occur on the superior mesenteric artery and its branches (among which ileal branches). Rupture is its major complication, thus rapid treatment is mandatory. CT angiography is the gold standard for diagnosis and therapeutic planification. Usual treatment is surgical, even though percutaneous embolization can be safely and precisely performed. Use of coils with sandwich technique is preferred.
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April 2022

 (Iguanidae) from the southern Lesser Antilles: An endemic lineage endangered by hybridization.

Zookeys 2022 17;1086:137-161. Epub 2022 Feb 17.

Laboratoire Écologie et Biologie des Interactions, équipe EES, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpin, 86073 Poitiers Cedex 9, France Université de Poitiers Poitiers France.

The newly described horned iguana from the southern Lesser Antilles is separated in two easily recognized subspecies: from St. Lucia and from the Grenadines. Its former description is completed by the use of 38 new samples for genetic and morphological analysis. Seventeen microsatellites were used to estimate genetic diversity, population structure and the level of introgression with other species over nearly the whole range of the species. ND4 and PAC sequences were also used to better characterize hybridization and to complete the description of this lineage. The population of St. Vincent shows a high level of introgression from whereas in the Grenadines, most islands present pure populations but several show evidence of introgressions. Of the two remaining populations of , only one is still purebred. The recent identification of this and other distinct insular species and subspecies in the eastern Caribbean, and evaluation of where hybridization has occurred, are timely and important because the native iguanas are in urgent need of conservation action. Among the greatest threats is the ongoing human-mediated spread of invasive iguanas from Central and South America, which are destroying the endemic insular lineages through multiple diachronic introgression events.
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http://dx.doi.org/10.3897/zookeys.1086.76079DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8873182PMC
February 2022

The NGS Magic Pudding: A Nanopore-Led Long-Read Genome Assembly for the Commercial Australian Freshwater Crayfish, .

Front Genet 2021 19;12:695763. Epub 2022 Jan 19.

GeneSEQ Sdn Bhd, Rawang, Malaysia.

, the yabby, is an iconic Australian freshwater crayfish species, which, similar to other major invertebrate groups, is grossly under-represented in genomic databases. The yabby is also the principal commercial freshwater crustacean species in Australia subject to explotation via inland fisheries and aquaculture. To address the genomics knowledge gap for this species and explore cost effective and efficient methods for genome assembly, we generated 106.8 gb of Nanopore reads and performed a long-read only assembly of the genome. On a mini-server configured with an ultra-fast swap space, the assembly took 131 h (∼5.5 days). Genome polishing with 126.3 gb of PCR-Free Illumina reads generated an assembled genome size of 3.3 gb (74.6% BUSCO completeness) with a contig N of 80,900 bp, making it the most contiguous for freshwater crayfish genome assemblies. We found an unusually large number of cellulase genes within the yabby genome which is relevant to understanding the nutritional biology, commercial feed development, and ecological role of this species and crayfish more generally. These resources will be useful for genomic research on freshwater crayfish and our methods for rapid and super-efficient genome assembly will have wide application.
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http://dx.doi.org/10.3389/fgene.2021.695763DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8807398PMC
January 2022

The invasive crayfish Cherax quadricarinatus facing chlordecone in Martinique: Bioaccumulation and depuration study.

Chemosphere 2022 Jan 18;286(Pt 3):131926. Epub 2021 Aug 18.

Laboratoire Ecologie et Biologie des Interactions, UMR CNRS 7267 Equipe Ecologie Evolution Symbiose, 5 Rue Albert Turpin, Poitiers Cedex, France.

The redclaw crayfish, Cherax quadricarinatus, was introduced to Martinique Island for aquaculture purposes at the beginning of the 21st century, in an attempt to revitalize the freshwater crustacean aquaculture sector. Mainly due to its high economical value, it was intentionally released in the wild and was caught and sold by fishermen. Martinican rivers are polluted by chlordecone, considered as one of the worst Persistant Organic Pollutants (POP). Despite its dangerousness, it was used until 1993 in the French West Indies against a banana pest and was always found in the ecosystems. This study aimed to investigate the level of contamination in the muscle of crayfish caught in the wild, as well as the potential of bioconcentration and depuration in the C. quadricarinatus muscle. This study could allow us to quantify the risk for consumers but also, to evaluate a depuration process to reduce the risk related to its consumption. Using both in-vitro and in-situ experiments, results highlighted the importance of the chlordecone concentration in the water and the time of exposure to the pollutant. The bioconcentration seems to be very quick and continuous in crayfish muscle, as chlordecone can be detectable as early as 6 h of exposure, whatever the concentration tested. Finally, it appears that, even after 20 days of depuration in chlordecone-free water, chlordecone concentrations remained higher to the residual maximum limit (i.e. 20 ng/g wet weight), concluding that the decontamination of the muscle seems not very efficient, and the risk for the Martinican people could be serious.
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http://dx.doi.org/10.1016/j.chemosphere.2021.131926DOI Listing
January 2022
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