Click
here to close Hello! We notice that
you are using Internet Explorer, which is not supported by Echinobase
and may cause the site to display incorrectly. We suggest using a
current version of Chrome,
FireFox,
or Safari.
Heredity (Edinb)
2019 Nov 01;1235:622-633. doi: 10.1038/s41437-019-0228-9.
Show Gene links
Show Anatomy links
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star.
Jossart Q
,
Sands CJ
,
Sewell MA
.
???displayArticle.abstract???
Poecilogony, or multiple developmental modes in a single species, is exceedingly rare. Several species described as poecilogenous were later demonstrated to be multiple (cryptic) species with a different developmental mode. The Southern Ocean is known to harbor a high proportion of brooders (Thorson''s Rule) but with an increasing number of counter examples over recent years. Here we evaluated poecilogony vs. crypticism in the brittle star Astrotoma agassizii across the Southern Ocean. This species was initially described from South America as a brooder before some pelagic stages were identified in Antarctica. Reproductive and mitochondrial data were combined to unravel geographic and genetic variation of developmental modes. Our results indicate that A. agassizii is composed of seven well-supported and deeply divergent clades (I: Antarctica and South Georgia; II: South Georgia and Sub-Antarctic locations including Kerguelen, Patagonian shelf, and New Zealand; III-VI-VII: Patagonian shelf, IV-V: South Georgia). Two of these clades demonstrated strong size dimorphism when in sympatry and can be linked to differing developmental modes (Clade V: dwarf brooder vs. Clade I: giant broadcaster). Based on their restricted geographic distributions and on previous studies, it is likely that Clades III-VI-VII are brooders. Clade II is composed of different morphological species, A. agassizii and A. drachi, the latter originally used as the outgroup. By integrating morphology, reproductive, and molecular data we conclude that the variation identified in A. agassizii is best described as crypticism rather than poecilogony.
,
On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life.
2020, Pubmed
,
On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life.
2020,
Pubmed
Allcock,
Southern Ocean diversity: new paradigms from molecular ecology.
2012,
Pubmed
Ballard,
The incomplete natural history of mitochondria.
2004,
Pubmed
Boissin,
Did vicariance and adaptation drive cryptic speciation and evolution of brooding in Ophioderma longicauda (Echinodermata: Ophiuroidea), a common Atlanto-Mediterranean ophiuroid?
2011,
Pubmed
,
Echinobase
Bouckaert,
BEAST 2: a software platform for Bayesian evolutionary analysis.
2014,
Pubmed
Byrne,
Reproduction and larval morphology of broadcasting and viviparous species in the Cryptasterina species complex.
2003,
Pubmed
,
Echinobase
Collin,
Molecular phylogenetic and embryological evidence that feeding larvae have been reacquired in a marine gastropod.
2007,
Pubmed
Darriba,
jModelTest 2: more models, new heuristics and parallel computing.
2012,
Pubmed
Duda,
Developmental shifts and species selection in gastropods.
1999,
Pubmed
Ellingson,
Evolution of poecilogony from planktotrophy: cryptic speciation, phylogeography, and larval development in the gastropod genus Alderia.
2006,
Pubmed
Excoffier,
Arlequin suite ver 3.5: a new series of programs to perform population genetics analyses under Linux and Windows.
2010,
Pubmed
Faurby,
Theoretical limits to the correlation between pelagic larval duration and population genetic structure.
2012,
Pubmed
Folmer,
DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates.
1994,
Pubmed
,
Echinobase
Fujisawa,
Delimiting species using single-locus data and the Generalized Mixed Yule Coalescent approach: a revised method and evaluation on simulated data sets.
2013,
Pubmed
Galaska,
Crossing the Divide: Admixture Across the Antarctic Polar Front Revealed by the Brittle Star Astrotoma agassizii.
2017,
Pubmed
,
Echinobase
Goodall-Copestake,
On the comparison of population-level estimates of haplotype and nucleotide diversity: a case study using the gene cox1 in animals.
2012,
Pubmed
Hart,
MOLECULAR PHYLOGENETIC ANALYSIS OF LIFE-HISTORY EVOLUTION IN ASTERINID STARFISH.
1997,
Pubmed
,
Echinobase
Heimeier,
Molecular species identification of Astrotoma agassizii from planktonic embryos: further evidence for a cryptic species complex.
2010,
Pubmed
,
Echinobase
Hemery,
Comprehensive sampling reveals circumpolarity and sympatry in seven mitochondrial lineages of the Southern Ocean crinoid species Promachocrinus kerguelensis (Echinodermata).
2012,
Pubmed
,
Echinobase
Ho,
SeqVis: visualization of compositional heterogeneity in large alignments of nucleotides.
2006,
Pubmed
Hugall,
An Exon-Capture System for the Entire Class Ophiuroidea.
2016,
Pubmed
,
Echinobase
Hunter,
Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the drake passage in the Southern Ocean.
2008,
Pubmed
,
Echinobase
Janosik,
Unrecognized Antarctic biodiversity: a case study of the genus Odontaster (Odontasteridae; Asteroidea).
2010,
Pubmed
,
Echinobase
Jossart,
Highly contrasted population genetic structures in a host-parasite pair in the Caribbean Sea.
2017,
Pubmed
,
Echinobase
Kapli,
Multi-rate Poisson tree processes for single-locus species delimitation under maximum likelihood and Markov chain Monte Carlo.
2017,
Pubmed
Kelly,
Genetic structure among 50 species of the northeastern Pacific rocky intertidal community.
2010,
Pubmed
Knott,
Introduction to symposium: Poecilogony--a window on larval evolutionary transitions in marine invertebrates.
2012,
Pubmed
Kumar,
MEGA X: Molecular Evolutionary Genetics Analysis across Computing Platforms.
2018,
Pubmed
Kumar,
MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 for Bigger Datasets.
2016,
Pubmed
Leese,
Cryptic speciation in a benthic isopod from Patagonian and Falkland Island waters and the impact of glaciations on its population structure.
2008,
Pubmed
Moon,
Reconsidering connectivity in the sub-Antarctic.
2017,
Pubmed
Pante,
Species are hypotheses: avoid connectivity assessments based on pillars of sand.
2015,
Pubmed
Poulin,
WHY ARE THERE SO MANY SPECIES OF BROODING ANTARCTIC ECHINOIDS?
1996,
Pubmed
Riesgo,
Evolutionary patterns in Antarctic marine invertebrates: an update on molecular studies.
2015,
Pubmed
Ronquist,
MrBayes 3: Bayesian phylogenetic inference under mixed models.
2003,
Pubmed
Schneider,
NIH Image to ImageJ: 25 years of image analysis.
2012,
Pubmed
Sewell,
Are Echinoderm Egg Size Distributions Bimodal?
1997,
Pubmed
Shanks,
Pelagic larval duration and dispersal distance revisited.
2009,
Pubmed
Sunnucks,
Numerous transposed sequences of mitochondrial cytochrome oxidase I-II in aphids of the genus Sitobion (Hemiptera: Aphididae).
1996,
Pubmed
Weber,
Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata).
2019,
Pubmed
,
Echinobase
Weber,
Genetic data, reproduction season and reproductive strategy data support the existence of biological species in Ophioderma longicauda.
2014,
Pubmed
,
Echinobase
White,
Ocean currents help explain population genetic structure.
2010,
Pubmed
Zhang,
A general species delimitation method with applications to phylogenetic placements.
2013,
Pubmed
