Enzyme variation in south-eastern Australian samples of the blue-eye or deepsea trevalla, Hyperoglyphe antarctica Carmichael 1818 (Teleostei: Stromateoidei)

Abstract

Six samples (n =67 to 154) of blue-eye or deepsea trevalla were collected from south-eastern Australia (seamounts off New South Wales, a seamount south-east of Tasmania called the Cascade Plateau, off the east, south and west coasts of Tasmania, and off the coast of South Australia). All fish were analysed by starch or cellulose acetate electrophoresis for the products of seven polymorphic loci (defined in this study as those with an average heterozygosity greater than 0.06); a minimum of 24 fish per area were also analysed for 29 other less variable loci. The average heterozygosity per locus was 5.3%. Polymorphic loci showed no significant deviations from Hardy-Weinberg equilibrium. The coefficient of genetic subpopulation differentiation, GST, was 0.38%. Bootstrapping procedures showed that this low value could be attributed to sampling error alone. Contingency Χ2 analysis similarly failed to reveal any significant inter-sample differentiation for any locus. The results indicate that gene flow is sufficient to prevent any genetic differentiation among the sampled localities. During the course of the study a second trevalla species, Schedophilus labyrinthicus, was identified in the New South Wales component of the fishery.

Incongruent patterns of genetic connectivity among four ophiuroid species with differing coral host specificity on North Atlantic seamounts

“…Similar levels of gene flow, with little to no evidence of seamount population structure, have been observed between populations of fish (e.g. Martin et al 1992;Bolch et al 1993), corals (e.g. Smith et al 2004a;Thoma et al 2009), and squat lobsters and a planktotrophic gastropod (e.g.…”

“…For example, investigations of polymorphic allozymes in the fish Hyperoglyphe antarctica and three mitochondrial gene regions in the fish Pseudopentaceros wheeleri revealed a lack of differentiation between different populations inhabiting neighboring seamounts and adjacent non‐seamount areas (Martin et al. 1992; Bolch et al. 1993).…”

“…The majority of studies targeting fish and larger mobile fauna have revealed little to no genetic or geographical isolation between seamounts. For example, investigations of polymorphic allozymes in the fish Hyperoglyphe antarctica and three mitochondrial gene regions in the fish Pseudopentaceros wheeleri revealed a lack of differentiation between different populations inhabiting neighboring seamounts and adjacent non-seamount areas (Martin et al 1992;Bolch et al 1993). In contrast, other population genetic studies of several invertebrates have shown genetic differentiation between even closely spaced (e.g.…”

GENETIC VARIATION AMONG STRAINS OF THE TOXIC DINOFLAGELLATE GYMNODINIUM CATENATUM (DINOPHYCEAE)

“…The cell mass was sonicated on ice twice for 10 s. Cell extracts were used immediately for allozyme studies. Two electrophoretic systems were used as described by Bolch et al (1993). The following six enzymes were found to have poor activity or were not clearly resolved and were not examined further: amino peptidase (Leu-Gly-Gly substrate, PEP1), amino peptidase (Leu-Tyr substrate, PEP2), glycerol-3-phosphate dehydrogenase (G3PDH), fumarate hydratase (FH), isocitrate dehydrogenase (IDH), and malic enzyme (ME).…”

Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts

“…Tagging studies of individual yellowfin and bigeye tuna also found that they moved from seamount areas to non-seamount areas (Itano and Holland 2000;Sibert et al 2000). Genetic studies on fish have also found that there are no differences between different populations found on neighboring seamounts and adjacent non-seamount areas (Bolsch et al 1993;Borets 1979). Although these studies have shown a lack of isolation between studies, they primarily target large fishes that would be the most mobile of all seamount fauna.…”