Genome size variation in deep-sea amphipods
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TLDR
The variation in genome size observed is striking and argues against genome size being driven by a common evolutionary history, ecological niche and life-history strategy in deep-sea amphipods.Abstract:
Genome size varies considerably across taxa, and extensive research effort has gone into understanding whether variation can be explained by differences in key ecological and life-history traits among species. The extreme environmental conditions that characterize the deep sea have been hypothesized to promote large genome sizes in eukaryotes. Here we test this supposition by examining genome sizes among 13 species of deep-sea amphipods from the Mariana, Kermadec and New Hebrides trenches. Genome sizes were estimated using flow cytometry and found to vary nine-fold, ranging from 4.06 pg (4.04 Gb) in Paralicella caperesca to 34.79 pg (34.02 Gb) in Alicella gigantea . Phylogenetic independent contrast analysis identified a relationship between genome size and maximum body size, though this was largely driven by those species that display size gigantism. There was a distinct shift in the genome size trait diversification rate in the supergiant amphipod A. gigantea relative to the rest of the group. The variation in genome size observed is striking and argues against genome size being driven by a common evolutionary history, ecological niche and life-history strategy in deep-sea amphipods.read more
Citations
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New species of Eurythenes from hadal depths of the Mariana Trench, Pacific Ocean (Crustacea: Amphipoda)
Johanna N. J. Weston,Priscilla Carrillo-Barragan,Thomas D. Linley,William D. K. Reid,Alan J. Jamieson +4 more
TL;DR: This new Eurythenes species was found to have distinct morphological characteristics and be a well-supported clade based on sequence variation at two mitochondrial regions (16S rDNA and COI) and it is not exempt from the impacts of anthropogenic pollution.
Journal ArticleDOI
Latitudinal variation in genome size in crustaceans
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Molecular Cytogenetic Analysis in Freshwater Prawns of the Genus Macrobrachium (Crustacea: Decapoda: Palaemonidae)
Wagner Franco Molina,Gideão Wagner Werneck Félix da Costa,Inailson Márcio Costa da Cunha,Luiz Antonio Carlos Bertollo,Tariq Ezaz,Thomas Liehr,Marcelo de Bello Cioffi +6 more
TL;DR: The study suggests that the 2n divergence was followed by a considerable rDNA diversification, and the abundance of the exceptional amount of microsatellite sequences in the chromosomes suggests that they are essential components of the Macrobrachium genome and, therefore, maintained as a shared feature by the species.
Journal ArticleDOI
Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean
Johanna N. J. Weston,Liliana Espinosa-Leal,Jennifer A. Wainwright,Eva C.D. Stewart,Eva C.D. Stewart,Carolina González,Thomas D. Linley,William D. K. Reid,Pamela Hidalgo,Marcelo E. Oliva,Osvaldo Ulloa,Frank Wenzhöfer,Frank Wenzhöfer,Ronnie N. Glud,Ronnie N. Glud,Ruben Escribano,Alan J. Jamieson +16 more
TL;DR: Eurythenes S. nov as discussed by the authors is a large species, max. observed length 83.2 mm, possessing diagnostic features, including a short gnathopod 1 palm and a chelate gnathophod 2 palm, and a distinct genetic lineage based on 16S rRNA and COI phylogeny.
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Genome Size Covaries More Positively with Propagule Size than Adult Size: New Insights into an Old Problem.
TL;DR: In this paper, it was shown that genome size correlates more positively with egg size than adult size in crustaceans, which is similar to the pattern observed in other kinds of animals and plants.
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