Molecular and morphological phylogenies of the Antarctic teleostean family Nototheniidae, with emphasis on the Trematominae

Sanchez, Sophie; Dettaı̈, Agnès; Bonillo, Céline; Ozouf−Costaz, Catherine; Detrich, H. William; Lecointre, Guillaume

doi:10.1007/s00300-006-0170-1

Cited by 45 publications

(60 citation statements)

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“…The black bands on ideograms indicate the position of the IgH loci. The topology of the phylogenetic tree is from Sanchez et al (2006) Genetica (2007 the present data cannot exclude the alternative hypothesis, also with four steps, that the extra IgH locus may have arisen independently in T. lepidorhinus, T. pennellii, T. newnesi and T. scotti. Due to the absence of detailed structural information, we cannot assess with certainty, the interspecific homeology among the chromosome pairs bearing IgH sequences in the various species.…”

Section: Discussionmentioning

confidence: 54%

“…However very recently Sanchez et al (2006) obtained a consensus phylogenetic tree for the family Nototheniidae based on MLL (Mixed lineage leukemia like gene), Rhodopsin and mitochondrial d-loop and cytochrome b sequencing. This included a better resolution of the interrelationships among the Trematominae, which now appear to be monophyletic.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, we follow the taxonomic nototheniid nomenclature from DeWitt et al (1990), except for the taxon borchgrevinki which has recently been assigned to the genus Trematomus according to phylogenetic evidence (Sanchez et al 2006). Ten Trematomus species were studied, namely T. bernacchii, T. borchgrevinki, T. eulepidotus, T. hansoni, T. lepidorhinus, T. loennbergii, T. newnesi, T. nicolai, T. pennellii and T. scotti.…”

Section: Studied Species and Samplingmentioning

confidence: 99%

“…Conventional karyotyping and molecular cytogenetics detected a high degree of karyotypic variability within the tribe, with diploid numbers ranging from 24 to 58 (Morescalchi et al 1992;Ozouf-Costaz et al 1999;Pisano and Ozouf-Costaz 2003). The phylogenetic relationships among these species have been matter of debate for many years and have been recently clarified (Sanchez et al 2006). Immunological analyses have been performed on one of the species in the tribe, Trematomus bernacchii.…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

et al. 2006

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The chromosomal location of the IgH locus has been analyzed in several bony fish of the Antarctic perciform group Notothenioidei. Two IgH probes were prepared from the species Trematomus bernacchii (family Nototheniidae, tribe Trematominae) and mapped onto the chromosomes of ten species belonging to the same genus (Trematomus) and in two outgroups, through one-color and two-color FISH. A single location of the IgH locus was found in the majority of the species examined, including the outgroups, whereas in four of them the IgH genes splited to two chromosomal loci. RT-PCR experiments revealed the presence of three allelic sequences in T. newnesi, a species in which the IgH genes were organized in two chromosomal loci. Possible pathways leading to IgH genes duplication during the diversification of trematomine fishes were inferred from the analysis of the FISH patterns in a phylogenetic context. The present work provides the first comprehensive picture of IgH genes organization at chromosomal level in a bony fish group.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Studied Species and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

et al. 2006

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“…Here we focus on sympatric sister species that form a crown clade in the notothenioid radiation. Because they share a common ancestry (Near et al 2004, Sanchez et al 2007, Near & Cheng 2008, Notothenia coriiceps and N. rossii are ideal for examining the association between buoyancy and ecological diversification within the spectrum of benthic life styles. Despite the ecological resemblances, N. coriiceps is more demersal and sedentary (North 1996), and feeds on a wider range of benthic organisms, whereas N. rossii is semipelagic and migratory, feeding regularly on water column prey, when available, during the summer months (Barrera-Oro ).…”

Section: Introductionmentioning

confidence: 99%

Adaptive radiation at a low taxonomic level: divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii

Eastman

Barrera-Oro²,

Moreira³

2011

Mar. Ecol. Prog. Ser.

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We studied the buoyancy of 263 specimens of the sympatric sister species Notothenia coriiceps and N. rossii captured at King George Island. In these species without a swim bladder, we expressed measurements of buoyancy as percentage buoyancy (%B = weight in water/weight in air × 100), with smaller numbers reflecting more buoyant (i.e. less dense) species. Mean %B of N. coriiceps (4.34%) was significantly greater than that of N. rossii (3.82%), reflecting the lower density and more active swimming, migratory, and feeding behavior of N. rossii compared to N. coriiceps. Skeletal weight as a percentage of body weight was also significantly greater in N. coriiceps (2.46%) than N. rossii (1.65%). Paradoxically, the weight of the vertebral column as a percentage of skeletal weight was significantly greater in N. rossii (28.01%) than in N. coriiceps (24.29%); however, this is intelligible in light of the bone anatomy and histology. Our sample encompassed a wide size and age range, and trend lines for scatter plots of %B against standard length were curvilinear for both species, peaking at 140 to 160 mm, a phenomenon not previously seen in studies of notothenioid buoyancy. We conclude that the ontogenetic increase in %B (reduced buoyancy) in fingerlings/young juveniles and the ontogenetic decrease in %B (increased buoyancy) in older juveniles/immature adults reflects disproportionate growth of skeletal and visceral tissues, respectively, and is not causally related to concurrent pelagic-demersal habitat shifts. KEY WORDS: Notothenioid · Ontogenetic variation · Skeletal anatomy and histology · South Shetland IslandsResale or republication not permitted without written consent of the publisher

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Divergence of brain and retinal anatomy and histology in pelagic antarctic notothenioid fishes of the sister taxa Dissostichus and Pleuragramma

Eastman

Lannoo

2011

Journal of Morphology

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The neutrally buoyant Antarctic fishes of the sister taxa Dissostichus (D. eleginoides and D. mawsoni) and Pleuragramma antarcticum diverged early in the notothenioid radiation and filled different niches in the pelagic realm of the developing Southern Ocean. To assess the influence of phylogenetic and ecological factors in shaping neural morphology in these taxa, we studied the anatomy and histology of the brains and retinae, and determined the proportional weights of brain regions. With the brain of the non-Antarctic sister taxon Eleginops maclovinus as plesiomorphic, statistically significant departures in the brains of the two Antarctic taxa include reduction of the corpus cerebelli and expansion of the mesencephalon and medulla. Compared to Eleginops, both species also have a relatively smaller telencephalon, although this is significant only in Dissostichus. There are a number of apomorphic features in the brain of Pleuragramma including reduced olfactory nerves and bulbs, an extremely small corpus cerebelli and an expanded mesencephalon. Although there is not a significant difference in the relative weights of the medulla in the two taxa, the prominence of the eminentia granularis and bulging cap-like appearance of the crista cerebellaris are distinctive in Pleuragramma. Brain histology of Dissostichus and Pleuragramma reflects typical perciform patterns and the two species of Dissostichus are histologically identical. Lateral compression in Pleuragramma and notable lobation in Dissostichus also contribute to differences between the taxa. Compression in Pleuragramma is attributable to convergence on an anchovy/herring body shape and to the relatively large brain in this small fish. The less prominent pattern of lobation of the telencephalon, inferior lobes and corpus cerebelli in Pleuragramma probably reflects underlying histology, specifically a reduction in cellularity of the neuropil in the nuclei and lobes. The retinal histology of Dissostichus and Pleuragramma encompasses the extremes seen in Antarctic notothenioids. Dissostichus has a thin scotopic retina with few cones and a high degree of summation. The retina of Pleuragramma is thick and cellular with many small single cones and rods and resembles that of Eleginops. Pedomorphy has not influenced brain morphology in these species but Pleuragramma has superficial neuromasts that are pedomorphic. Although Dissostichus and Pleuragramma are sympatric in the water column, their brains and retinae are highly divergent and reflect the influences of both phylogeny and ecological partitioning of the pelagic realm. Compared to Eleginops, the relatively smaller corpus cerebelli but relatively larger medulla probably indicates, respectively, reduced activity levels of notothenioids in subzero temperatures and expansion of the mechanosensory lateral line system as a supplement to vision under conditions of reduced light. Compared to Dissostichus, Pleuragramma has reduced olfactory bulbs and corpus cerebelli and an expanded mesencephalon. The reduction of the co...

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Molecular and morphological phylogenies of the Antarctic teleostean family Nototheniidae, with emphasis on the Trematominae

Cited by 45 publications

References 20 publications

Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

Adaptive radiation at a low taxonomic level: divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii

Divergence of brain and retinal anatomy and histology in pelagic antarctic notothenioid fishes of the sister taxa Dissostichus and Pleuragramma

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Molecular and morphological phylogenies of the Antarctic teleostean family Nototheniidae, with emphasis on the Trematominae

Cited by 45 publications

References 20 publications

Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

Adaptive radiation at a low taxonomic level: ­divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii

Divergence of brain and retinal anatomy and histology in pelagic antarctic notothenioid fishes of the sister taxa Dissostichus and Pleuragramma

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Adaptive radiation at a low taxonomic level: divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii