MtDNA and nuclear data reveal patterns of low genetic differentiation for the isopods &lt;i&gt;Stenosoma lancifer and Stenosoma acuminatum&lt;/i&gt;, with low dispersal ability along the northeast Atlantic coast

Xavier, Raquel; Santos, António M.; Branco, Madalena

doi:10.3989/scimar.03373.29a

Cited by 11 publications

(8 citation statements)

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“…Restricted dispersal may indirectly enhance differentiation among populations by promoting the effects of local selection, inbreeding and drift (Pelc et al 2009). However, the high population connectivity found in the same region for other species with direct development (Xavier et al 2012) as well as the existence of a genetic break at Cape Ghir (approximately 250 km south of the southernmost site included in this study, Safi) in a species with larval dispersal (Jaziri and Benazzou 2002), suggest that dispersal ability is probably not the only explanation for the patterns observed in this study. Probably the existence of refugial areas also plays an important role in maintaining this kind of structure.…”

Section: Taxonomic and Ecological Remarksmentioning

confidence: 56%

Hidden diversity and cryptic speciation refute cosmopolitan distribution inCaprella penantis(Crustacea: Amphipoda: Caprellidae)

Cabezas

Machordom

et al. 2013

J Zoolog Syst Evol Res

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Caprella penantis is considered a cosmopolitan species and one of the most challenging caprellids in taxonomic terms because of its remarkable intraspecific morphological variation. This study examined DNA sequences from mitochondrial (COI) and nuclear (18S) markers together with morphological data from 25 localities of C. penantis, and closely related species Caprella dilatata and Caprella andreae, all traditionally considered part of the old ‘acutifrons’ complex. The large genetic divergence and reciprocally allopatric distributions point to the existence of a species complex of at least four species, of which one is reported as a cryptic species. This study provides the first evidence of cryptic speciation in the family Caprellidae, and questions the validity of some traditional morphological characters used to delimit species in the genus Caprella. Our results are consistent with the idea that main factors were probably isolation by distance and ecological traits, promoting diversification in C. penantis. The strong genetic structure reported for this species in the Iberian Peninsula and Moroccan coasts also suggests restriction to dispersal as well as the presence of refugial areas. These results highlight the utility of the COI and 18S genes in combination with morphological characters for shedding light on systematic questions in caprellids, and patterns of genetic connectivity.

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Section: Taxonomic and Ecological Remarksmentioning

confidence: 56%

Hidden diversity and cryptic speciation refute cosmopolitan distribution inCaprella penantis(Crustacea: Amphipoda: Caprellidae)

Cabezas

Machordom

et al. 2013

J Zoolog Syst Evol Res

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“…However, there is increasing evidence that the duration of pelagic stages is not directly correlated with dispersal potential (Johannesson 1988;Strathmann et al 2002). This is supported by the fact that many brooding species have wider geographic distributions showing even more genetic connectivity on large scales than congeners with a planktonic larval stage (Highsmith 1985;Ó Foighil et al 2001;Nunes et al 2011;Hoeksema et al 2012;Xavier et al 2012). Passive dispersal through rafting and floating can greatly enhance natural dispersal in the marine environment and is supposed to be the main process leading to long-distance dispersal of these brooding marine invertebrates (Johannesson 1988;Locke and Corey 1989;Thiel and Gutow 2005b;Goodbody-Gringley et al 2010).…”

Section: Introductionmentioning

confidence: 71%

“…Dispersal by rafting is considered as an important means of maintaining population connectivity on both small and large spatial scales: marine organisms that use rafting for dispersing can maintain large and relatively homogeneous populations with little or no genetic subdivision (Fraser et al 2011;Hoeksema et al 2012;Xavier et al 2012). However, some studies have shown that rafting facilitates dispersal, but does not necessarily maintain genetic connectivity among distant populations (Waters and Roy 2004;Baratti et al 2005;Waters 2011).…”

Section: Discussionmentioning

confidence: 99%

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Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

et al. 2012

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The amphipod Caprella andreae Mayer, 1890 was recorded for the first time in Southern Iberian Peninsula (36°44 0 15 00 N, 3°59 0 38 00 W). This species is the only obligate rafter of the suborder Caprellidea and has been reported to attach not only to floating objects such as ropes or driftwoods but also to turtle carapaces. Mitochondrial and nuclear markers were used to examine dispersal capabilities and population genetic structure of C. andreae across seven localities in the Mediterranean and Atlantic Ocean collected from floating substrata with different dispersal patterns. The strong population differentiation with no haplotypes shared between populations suggests that C. andreae is quite faithful to the substratum on which it settles. In addition, the proportionally higher genetic diversity displayed in populations living on turtles as well as the presence of highly differentiated haplotypes in the same turtle population may be indicative that these populations survive longer, which could lead C. andreae to prefer turtles instead of floating objects to settle and disperse. Therefore, rafting on floating objects may be sporadic, and ocean currents would not be the most important factor shaping patterns of connectivity and population structure in this species. Furthermore, molecular phylogenetic analyses revealed the existence of a cryptic species whose estimates of genetic divergence are higher than those estimated between C. andreae and other congeneric species (e.g. Caprella dilatata and Caprella penantis). Discovery of cryptic species among widely distributed small marine invertebrates is quite common and, in this case, prompts for a more detailed phylogenetic analysis and taxonomic revision of genus Caprella. On the other hand, this study also means the first record of the gammarids Jassa cadetta and Elasmopus brasiliensis and the caprellid Caprella hirsuta on drifting objects.

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“…Such changes have resulted in a latitudinal gradient of genetic divergence, with higher levels of diversity at southern locations, which might have functioned as glacial refugia (Luttikhuizen et al 2008, Kettle et al 2010, Xavier et al 2012. For example, in the eastern Atlantic, the Macaronesian archipelagos, the Iberian Peninsula, and the Atlantic coasts of North Africa have been suggested as such glacial refugia areas (Coyer et al 2004, Maggs et al 2008, Kettle et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

Larsen¹,

Tuya

Froufe³

2014

Sci. Mar.

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Summary:In this study, the phylogeographic patterns of nuclear, ribosomal and mtDNA gene fragments of five tanaidacean species (Zeuxo, Tanaidae) from the Atlantic, Pacific and Mediterranean Sea were investigated. We aimed to interpret results in the framework of current hypotheses on the distribution of small invertebrates with very limited dispersal ability. Evidence for a surprisingly high genetic divergence was found for intertidal tanaidaceans from the North Atlantic. This is a result of poor dispersal potential, as tanaidaceans have direct development, no pelagic stage, and very limited swimming capacity. However, lower genetic divergence was found between an intertidal tanaid species from the North Atlantic and two from the North Pacific, which suggests a scenario of recent colonization following the last glacial maximum. The species Zeuxo normani was found to be a species complex consisting, at least, of Z. normani (California), Z. cf. normani (Japan), Z. cf. normani (Australia), Z. sp. A (Korea), and Z. holdichi (Spain and France). Our results showed that traditional species identification underestimates tanaidacean diversity and that what have been previously perceived as reliable diagnostic morphological characters, are, however, variable and unreliable.Keywords: genetic divergence; morphological differences; 28S; H3; COI; Crustacea; Tanaidacea; Zeuxo. Divergencia genética de tanaidáceos (Crustacea: Peracarida) con baja capacidad de dispersiónResumen: En este estudio, investigamos los patrones filogeográficos de fragmentos de ADN nuclear, ribosómico y mitocondrial de 5 especies de tanaidáceos (Zeuxo, Tanaidae) del Atlántico, Pacífico y Mediterráneo. Nos propusimos interpretar los resultados en el marco de hipótesis sobre la distribución de pequeños invertebrados con limitada capacidad de dispersión. Encontramos evidencia de una sorprendentemente alta diferenciación genética para tanaidáceos del medio intermareal del Atlántico Norte. Esto es resultado de una limitada capacidad de dispersión, ya que los tanaidáceos poseen desarrollo directo, carecen de estadíos pelágicos, y una limitada capacidad natatoria. Sin embargo, encontramos una baja diferenciación genética para una especie de tanaidáceo del Atlántico Norte y dos del Pacífico Norte, lo que sugiere un escenario de reciente colonización tras la última glaciación. La especie Zeuxo normani constituye un complejo de especies que, al menos, agrupa a Z. normani (Califonia), Z. cf. normani (Japón), Z. cf. normani (Australia), Z. sp. A (Corea) y Z. holdichi (España y Francia). Nuestros resultados mostraron que la forma tradicional de identificar tanaidáceos subestima su diversidad y que lo que previamente se consideraron como caracteres morfológicos claramente diferenciadores son, sin embargo, variables y poco fiables.Palabras clave: diferencias genéticas; diferencias morfológicas; 28S; COI; crustáceos, tanaidáceos, Zeuxo.Citation/Como citar este artículo: Larsen K., Tuya F., Froufe E. 2014. Genetic divergence of tanaidaceans (Crustacea: Peracarida) with l...

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MtDNA and nuclear data reveal patterns of low genetic differentiation for the isopods <i>Stenosoma lancifer and Stenosoma acuminatum</i>, with low dispersal ability along the northeast Atlantic coast

Cited by 11 publications

References 54 publications

Hidden diversity and cryptic speciation refute cosmopolitan distribution inCaprella penantis(Crustacea: Amphipoda: Caprellidae)

Hidden diversity and cryptic speciation refute cosmopolitan distribution inCaprella penantis(Crustacea: Amphipoda: Caprellidae)

Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

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