Genetic variation among life-history stages of mussels in a Mytilus edulis?M . trossulus hybrid zone

Toro, Jorge E.; Innes, David J.; Thompson, R. J.

doi:10.1007/s00227-004-1363-1

Cited by 38 publications

(55 citation statements)

References 52 publications

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“…Knowledge of the life-history differences between the M. edulis and M. trossulus taxa is needed to understand the dynamics of mussel taxa coexistence and hybrid zones as well as the environmental and genetic factors that can explain not only the occurrence of hybrids but also the mechanisms that keep the species Table 1 Polar Biol (2016) 39:343-355 351 distinct despite hybridization (McDonald et al 1991;Toro et al 2004). The two taxa, M. edulis and M. trossulus, hold the same habitat, where individuals are attached to the substrate by byssus threads and filter food particles from the water column.…”

Section: Characteristics Of Greenland Mytilus Populations and Interpomentioning

confidence: 99%

“…The possible impact of recent mixing of M. trossulus with M. edulis was discussed by Zbawicka et al (2012). Structures in hybrid zones have been studied with respect to reproductive barriers, and results have indicated higher conspecific than heterospecific fertilization rates and greater survival of larvae from conspecific than heterospecific crosses (e.g., Miranda et al 2010;Toro et al 2004;Klibansky and McCartney 2014). There are also indications of differences in life-history traits, where for example M. edulis have been found to initiate spawning before the time of M. trossulus.…”

Section: Hybridizationmentioning

confidence: 99%

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A first report on coexistence and hybridization of Mytilus trossulus and M. edulis mussels in Greenland

et al. 2015

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Semi-sessile Mytilus mussels are used as indicators of climate changes, but their geographic distribution is not sufficiently known in the Arctic. The aim of this study was to investigate the taxonomic status and genetic differentiation of Mytilus populations in a Northwest Greenlandic fjord at Maarmorilik, impacted by contaminations from a former mine. In this study, mussels were collected at three sites differing in exposure to environmental factors. A total of 54 polymorphic SNPs found in the Mytilus EST and DNA sequences analyzed were successfully applied to 256 individuals. The results provided the first evidence for the existence of M. trossulus in Greenland. The mussel from M. trossulus and M. edulis taxa are shown to coexist and hybridize in the fjord. The three studied sites were found to differ significantly in the distribution of taxa with a higher prevalence of M. trossulus in the inner fjord. The identified M. edulis 9 M. trossulus hybrids mostly had a hybrid index score of about 0.5, indicating a similar number of alleles characteristic for M. trossulus and M. edulis. There was a low number of backcrosses between 'pure' taxa and hybrids. This newly discovered hybrid zone between the two taxa is unique in comparison with the Canadian populations. As Mytilus mussels in Greenland hitherto have been regarded as the one taxon M. edulis, the results have importance for biogeography and future monitoring and environmental studies.

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Section: Characteristics Of Greenland Mytilus Populations and Interpomentioning

confidence: 99%

Section: Hybridizationmentioning

confidence: 99%

A first report on coexistence and hybridization of Mytilus trossulus and M. edulis mussels in Greenland

et al. 2015

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“…In addition, many genetic studies describe their ability to generate hybrid individuals when two species are in contact (Dias et al, 2009;Kijewski et al, 2009;Gardner & Westfall, 2012). Mussels develop for weeks, even months, in planktonic larval stages and thereby potentially dispersed over large geographical areas by marine currents or human-mediated activities (Hilbish et al, 2002;Toro et al, 2004). Biochemical and molecular characterization divided the morphologically classified Mytilus edulis Linnaeus, 1758 into a complex of three sibling species termed the Mytilus edulis species complex: M. edulis, M. trossulus Gould, 1850 and M. galloprovincialis Lamarck, 1819 (Westfall & Gardner, 2010).…”

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Genetic composition of Mytilus species in mussel populations from southern Chile

Larraín¹,

Díaz²,

Lamas³

et al. 2012

lajar

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ABSTRACT. Mussels are one of the most cultivated and commercialized bivalves worldwide and in southern Chile its culture represent an important economic activity. The species identification within the Mytilus genera, by morphological features, is unreliable, so we used a polymorphism RFLP in the gene encoding the polyphenolic adhesive protein as a species-specific genetic marker to describe Mytilus species diversity in southern Chile, and evaluate possible applications in traceability, food quality and safety. Using Me 15-16 marker most mussels were M. chilensis, finding no other pure individuals; however, putative hybrids of M. chilensis x M. trossulus and M. chilensis x M. galloprovincialis were detected. There was no evidence of M. edulis. The presence of the M. trossulus allele, faraway from its distribution area, demands further analysis with different genetic markers to allow a better understanding of its origin. In addition, the correspondence between markers that distinguishes northern from southern hemisphere M. galloprovincialis, with those who discriminates between M. chilensis and M. galloprovincialis would contribute to the taxonomic status of Chilean blue mussels. In Chile, the genetic composition of Mytilus indicates that geographical origin of mussels and its traceability cannot be established merely from the identification of the species. The use of other markers would be required. Keywords: Mytilus, mussels, genetic identification, Me 15-16, PCR-RFLP, southern Chile. Composición genética de especies de

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“…The results of Comesaña et al (1999) and Toro et al (2004) ♀Mg x ♂Mg 100 0.16 (0.14) C (Koehn, 1991), we expected that a potentially chilean mussel hybrid zone could be represented by very high percentages of natural hybrids. The results of the present study provide evidence that there are no differences in the percentage of fertilized eggs between pure line crosses and hybrid crosses between M. chilensis and M. galloprovincialis.…”

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confidence: 57%

Production and performance of larvae and spat of pure and hybrid species of Mytilus chilensis and M. galloprovincialis from laboratory crosses

Toro

Oyarzún

Peñaloza

et al. 2012

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ABSTRACT. Adult specimens of M. galloprovincialis from Concepción Bay and M. chilensis from Yaldad Bay, Chile, were transferred to the laboratory to produce crosses of "pure" and "hybrid" species in order to evaluate early larval development and growth. These variables are important for understanding the dynamics of these two mussel species in this potential hybrid zone where they occur sympatrically. The study showed that fertilization occurred in all crosses and significant differences were not detected between pure lines and hybrids in terms of the percentage of eggs that developed into larvae. Hybrid larvae and spat from both reciprocal crosses grew significantly more than those from pure lines, although valve length values were within the ranges reported in the literature. Keywords: Mytilus chilensis, Mytilus galloprovincialis, larval development, hybrids, Chile. Producción y comportamiento de larvas de especies puras e híbridas entreMytilus chilensis y Mytilus galloprovincialis obtenidas en laboratorio RESUMEN. Ejemplares adultos de M. galloprovincialis de la bahía de Concepción y de M. chilensis de la bahía de Yaldad, Chile, se trasladaron al laboratorio para realizar cruzamientos puros de cada especie e híbridos, para evaluar el desarrollo larval temprano y su crecimiento. Estas variables son importantes para entender la dinámica de estas dos especies de mitílidos en esta potencial zona híbrida donde se encuentran en forma simpátrica. El estudio mostró que la fertilización ocurrió en todos los cruzamientos y no se detectó diferencias significativas entre líneas puras e híbridas en el porcentaje de huevos que se desarrollaron a larvas. Las larvas y juveniles híbridos de ambos cruzamientos recíprocos crecieron significativamente más que las larvas de los cruzamientos de especies puras, aunque los valores de longitud de la valva están dentro de los rangos reportados en la bibliografía. There is no evidence in the literature for the presence of unfit hybrid recombinants within Mytilus hybrid zones (Comesaña et al., 1999;Toro et al., 2002;Beaumont et al., 2004;Westfall & Gardner, 2010;Dias et al., 2011). As discussed by Comesaña et al. (1999), the degree of natural hybridization is generally higher in the Mytilus edulis-M. galloprovincialis hybrid zone in Europe than in the M. edulis-M. trossulus hybrid zone on the east coast of north America. According to Harrison (1993) the more genetically divergent the parental types, the lower will be the fitness of the hybrids produced. This difference in natural hybridization in these two mussel hybrid zones implies that M. edulis and M. galloprovincialis are more closely related (Gardner, 1994) than are M. edulis and M. trossulus (Rawson et al., 1996). This has been corroborated by successful interbreeding between M. edulis and M. galloprovincialis, the

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Genetic variation among life-history stages of mussels in a Mytilus edulis?M . trossulus hybrid zone

Cited by 38 publications

References 52 publications

A first report on coexistence and hybridization of Mytilus trossulus and M. edulis mussels in Greenland

A first report on coexistence and hybridization of Mytilus trossulus and M. edulis mussels in Greenland

Genetic composition of Mytilus species in mussel populations from southern Chile

Production and performance of larvae and spat of pure and hybrid species of Mytilus chilensis and M. galloprovincialis from laboratory crosses

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