Joaquín Vierna

Joaquín Vierna
AllGenetics

PhD

About

20
Publications
6,140
Reads
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271
Citations
Citations since 2016
8 Research Items
192 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
October 2011 - present
AllGenetics
Position
  • Manager

Publications

Publications (20)
Article
Full-text available
Ensis Schumacher, 1817 razor shells occur at both sides of the Atlantic and along the Pacific coasts of tropical west America, Peru, and Chile. Many of them are marketed in various regions. However, the absence of clear autapomorphies in the shell and the sympatric distributions of some species often prevent a correct identification of specimens. A...
Article
Full-text available
We report current genetic variation of popula-tions of the razor shell Ensis directus (Conrad 1843) (Mollusca: Bivalvia: Pharidae) in native (North American) and introduced (European) ranges using nuclear and mitochondrial sequence-based markers. We expected less variation within the introduced range, especially consid-ering the frequent mass morta...
Article
Full-text available
The linkage between 5S ribosomal DNA and other multigene families has been detected in many eukaryote lineages, but whether it provides any selective advantage remains unclear. In this work, we report the occurrence of linked units of 5S ribosomal DNA (5S rDNA) and U1 small nuclear DNA (U1 snDNA) in 10 razor shell species (Mollusca: Bivalvia: Phari...
Article
Full-text available
Purpose A large fraction of a plant’s biomass is belowground, especially in shrublands that typically occur in episodically water-limited climates. Nonetheless, we have no standardized method to map the distribution of the root density (i.e., biomass per soil volumetric unit) of plant individuals (hereafter, Individual-level Root Density Distributi...
Preprint
Full-text available
Purpose: A large fraction of a plant’s biomass is thought to be belowground, especially in shrublands that typically occur in episodically water-limited climates. Nonetheless, we have no standardized method to map individual plant’s root density distribution (IRDD) and lack of easily obtainable allometric predictors of shrubland belowground biomass...
Article
Full-text available
Otter diet in reservoirs is known to experience seasonal changes. We selected a reservoir with a large population of exclusively wintering great cormorants and seasonal changes in stored water volume to test the relative influence of abiotic and biotic factors on otter foraging ecology. DNA metabarcoding of otter spraints revealed a dietary change...
Article
The patterns of genetic and phenotypic diversity in marine life are the result of different geological and ecological processes. We analyzed the pattern of genetic and morphometric variation of the razor clam Ensis macha along its entire geographic distribution. This species is one of the most important shellfish resources of South America. To unco...
Article
Full-text available
Conservation and sustainable management of aquatic ecosystems is a priority in environmental programs worldwide. However, these aims are highly dependent on the efficiency, accuracy and cost of existent methods for the detection of keystone species and monitoring of biological communities. Rapid advances in eDNA, barcoding and metabarcoding promote...
Article
Full-text available
Feather mites are among the most common and diverse ectosymbionts of birds, yet basic questions such as the nature of their relationship remain largely unanswered. One reason for feather mites being understudied is that their morphological identification is often virtually impossible when using female or young individuals. Even for adult male speci...
Article
Full-text available
We assembled and annotated the complete mitochondrial genome of Trouessartia rubecula, the first feather mite complete mitochondrial genome from the largest feather mite superfamily Analgoidea (ca. 1150 spp). The mitogenome was composed of 13 protein, 17 tRNA, and 2 rRNA-coding genes and was 14,125 bp in length.
Article
Full-text available
High-throughput DNA barcoding has become essential in ecology and evolution but some technical questions still remain. Increasing the number of PCR cycles above routine 20-30 cycles is a common practice when working with old-type specimens, with little amounts of DNA, or when facing annealing issues with the primers. However, increasing the number...
Article
Full-text available
Several studies on 5S ribosomal DNA (5S rDNA) have been focused on a subset of the following features in mostly one organism: number of copies, pseudogenes, secondary structure, promoter and terminator characteristics, genomic arrangements, types of non-transcribed spacers and evolution. In this work, we systematically analyzed 5S rDNA sequence div...
Article
Full-text available
The European razor shell Ensis minor (Chenu 1843) and the American E. directus (Conrad 1843) have a diploid chromosome number of 38 and remarkable differences in their karyotypes: E. minor has four metacentric, one metacentric–submetacentric, five submetacentric, one subtelocentric and eight telocentric chromosome pairs, whereas E. directus has thr...
Article
Full-text available
Several reports on the characterization of 5S ribosomal DNA (5S rDNA) in various animal groups have been published to date, but there is a lack of studies analyzing this gene family in a much broader context. Here, we have studied 5S rDNA variation in several molluskan species, including bivalves, gastropods, and cephalopods. The degree of conserva...
Article
Full-text available
Internal transcribed spacer 1 and 2 (ITS1 and ITS2) sequences were analysed in Ensis razor shells (Mollusca: Bivalvia: Pharidae). We aimed to (1) test ITS1 and ITS2 as molecular markers at the population level in the successful alien E. directus (Conrad, 1843); (2) test these spacers at the species level in E. directus and three other Ensis species...
Article
Full-text available
A study of nucleotide sequence variation of 5S ribosomal DNA from six Ensis species revealed that several 5S ribosomal DNA variants, based on differences in their nontranscribed spacers (NTS), occur in Ensis genomes. The 5S rRNA gene was not very polymorphic, compared with the NTS region. The phylogenetic analyses performed showed a between-species...

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Project (1)
Project
Studies on the diversification history, evolutionary ecology and tools for the study of these symbionts.