Mitochondrial DNA variation and phylogenetic relationships of Jasus spp. (Decapoda: Palinuridae)

Abstract

The seven species of rock lobster in the genus Jasus have a fragmented circumpolar distribution, inhabiting continental or island waters of the Southern Ocean. Gene flow between nominal species is possible as the planktonic larval stages of Jasus are widely dispersed in major oceanic gyres. Restriction endonuclease analysis of mitochondrial DNA (mtDNA) from five species (J. verreauxi, J. novaehollandiae, J. edwardsii, J. lalandii and J. tristani) was used to assess taxa previously defined only by morphological criteria. Intraspecific mtDNA nucleotide sequence diversity was generally high (0˙33–0˙99%). An absence of episodic population bottlenecks and extinctions, attributable to a teleplanic (far wandering) and prolonged pelagic stage, may be a significant factor contributing to this variation. New Zealand (J. edwardsii) and Australian (J. novaehollandiae) populations appear to be conspecific and should be referred to as J. edwardsii; however, a significant difference in the magnitude of mean sequence diversities between these populations may indicate restrictions to gene flow across the Tasman Sea. The genome of J. verreauxi is highly distinct from the genomes of the other species (nucleotide sequence diversity: 14˙92–16˙67%), supporting the existence of ‘verreauxi’ and ‘lalandii’ groups within Jasus. High sequence diversities separating J. edwardsii, J. lalandii and J. tristani (4˙41–7˙36%) indicates longterm reproductive isolation. Hypotheses for the evolution of ‘lalandii’ group Jasus, which suggest a relatively recent divergence of J. lalandii and J. tristani, are not supported by phylogenetic reconstruction. Instead, it gives systematic validity to the grouping of J. lalandii with J. edwardsii as proposed by the existing taxonomy.

Isolation and characterization of mitochondrial DNA from the endangered white-clawed crayfish Austropotamobius pallipes pallipes, Lereboullet, 1858

“…In Jasus edwardsii, OVENDEN et al (1992) have compared 13 populations and obtained a nucleotides substitution mean of about 0.78 whereas the heterozygosity was low in this same species (0.015 according to SMITH ef al., 1980). BRASHER et al (1992b) confirmed a high level of mitochondrial polymorphism in the genus Jasus by studying 5 species. Seeing that OVENDEN (1990) specified that some marine species have less variable mitochondrial génomes than previously studied terrestrial and freshwater species, we can hope that mitochondrial DNA will be a suitable molecular marker in crayfish.…”

A new deep-sea Cirripedia of the genus Heteralepas from the northeastern Atlantic

“…In addition, the marker 12S presented divergences approximately of 6.5% and 7.5 %, with the species H. canci and H. japonica, respectively, being within the expected values for barnacle species within the same genus (Chan et al 2007(Chan et al , 2009). The marker 16S also showed 7 % of genetic divergence with the only specimen of Heteralepas (unidentified) available in public databases (Schiffer & Herbig 2016, GenBank accession KT947465), which is in accordance with the results obtained for other crustaceans (Brasher et al 1992;Machado et al 1993). H. adiposa Zevina, 1982 andH.…”

Biogeography of a southern hemisphere freshwater fish: how important is marine dispersal?

“…We suggest that the evolutionary biology of G. maculatus parallels that of species that have long‐duration planktonic marine larval stages (e.g. Brasher et al . 1992; Ovenden et al .…”