Phylogeography of the marine isopod<i>Stenosoma nadejda</i>(Rezig, 1989) in North African Atlantic and western Mediterranean coasts reveals complex differentiation patterns and a new species

Xavier, Raquel; Zenboudji, Saliha; Lima, Fernando P.; Harris, D. James; Santos, António M.; Branco, Madalena

doi:10.1111/j.1095-8312.2011.01718.x

Cited by 25 publications

(35 citation statements)

References 58 publications

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“…3). The high levels of COI genetic divergence ([13 %) between C. andreae's C A and C B is within the interspecific values obtained in this study between the congeneric species C. penantis and C. dilatata (Table 3), as well as those described for other marine peracarid crustaceans (Ashton et al 2008;Xavier et al 2009Xavier et al , 2011.…”

Section: Taxonomic Issuessupporting

confidence: 85%

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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Section: Taxonomic Issuessupporting

confidence: 85%

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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“…A similar pattern in the same geographical region has been observed in another peracarid species: Stenosoma nadejda (Rezig, 1989), where the genetic break separating the Northern portion of the Atlantic Moroccan coast from the Atlantic Iberia and the Alboran Sea was detected (Xavier et al. , ). The second has never been reported in the literature.…”

Section: Discussionsupporting

confidence: 71%

“…; Xavier et al. ). Furthermore, the considerable COI genetic divergence observed between these clades may be indicative of the occurrence of a process of ongoing speciation.…”

Section: Discussionmentioning

confidence: 98%

“…; Xavier et al. , ) and has often been attributed to the large population sizes of marine species (Bucklin and Wiebe ). Our results show two main genetic breaks along the study area: the first one separates the Northern Atlantic Moroccan coast from the Atlantic Iberia and the Mediterranean Sea, whereas the second separates the Northern Atlantic Iberia (Bay of Biscay) from the Southern Atlantic.…”

Section: Discussionmentioning

confidence: 99%

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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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“…In order to resolve taxonomic ambiguity, molecular taxonomy has been successfully applied to isopods. Examples include the validation of new species (Khalaji‐Pirbalouty & Raupach, ; Xavier et al, ), discrimination of morphologically similar species (Radulovici, Sainte‐Marie, & Dufresne, ; Xavier et al, ) or unravelling multiple cryptic species complexes (Brix, Svavarsson, & Leese, ; Markow & Pfeiler, ; Raupach et al, ; Raupach & Wägele, ; Varela & Haye, ).…”

Section: Introductionmentioning

confidence: 99%

Deep segregation in the open ocean: Macaronesia as an evolutionary hotspot for low dispersal marine invertebrates

Vieira

Desiderato

Holdich³

et al. 2019

Molecular Ecology

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Diversification and speciation of terrestrial organisms are anticipated in oceanic islands such as Macaronesia, a group of Atlantic islands that have remained unconnected to continental landmasses. Hitherto, the diversification of marine organisms in oceanic islands, especially those with low vagility, has received little direct empirical analysis using molecular markers. Here, we focus on such a case study, through applying a multilocus molecular approach to investigate the diversity and evolution of a group that lacks a planktonic larval stage, the isopod genus Dynamene, in Macaronesia and Northeast Atlantic. Sequences of two mitochondrial (cytochrome c oxidase subunit I and 16S rRNA) and two nuclear (18S rRNA and 28S rRNA) loci were obtained from specimens of Dynamene edwardsi (Lucas, 1849), Dynamene magnitorata Holdich, 1968 and Dynamene bidentata (Adams, 1800) collected along the Northeast Atlantic and Macaronesia. Although no major phylogeographic structure was detected in D. bidentata and D. magnitorata, from five to nine deeply divergent lineages were evident within D. edwardsi. The divergent lineages displayed genetic distances comparable to those found among established species of peracarids. D. edwardsi exhibits a long, rich and complex phylogeographic history in Macaronesia, where the geodynamics of the islands possibly associated with founder effects and subsequent lack of gene flow among populations confounds patterns based on geographic proximity of targeted populations. Our findings collectively suggest a much larger role of oceanic islands in the diversification of marine invertebrates than previously anticipated. The work provides insights into the origins and dynamics of ongoing geographic segregation and associated deep divergence among sister evolutionary lineages in Macaronesia.

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Phylogeography of the marine isopodStenosoma nadejda(Rezig, 1989) in North African Atlantic and western Mediterranean coasts reveals complex differentiation patterns and a new species

Cited by 25 publications

References 58 publications

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

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

Deep segregation in the open ocean: Macaronesia as an evolutionary hotspot for low dispersal marine invertebrates

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