Probing marine<i>Gammarus</i>(Amphipoda) taxonomy with DNA barcodes

Costa, Filipe O.; Henzler, Christy; Lunt, David H.; Whiteley, N.M.; Rock, Jenny

doi:10.1017/s1477200009990120

Cited by 110 publications

(100 citation statements)

References 56 publications

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“…This is in line with the results of several recent studies which suggested that many widespread marine invertebrates taxa comprise genetically divergent cryptic species (Sponer and Roy 2002;Moura et al 2008;Chen and Hares 2011). Additionally, in the order Amphipoda, cryptic speciation has been widely reported, especially for gammarids (Costa et al 2009;Radulovici et al 2009;Baird et al 2011). In this sense, the study carried out by Pilgrim and Darling (2010) is particularly interesting because it provides molecular evidence of cryptic speciation in two introduced biofouling amphipods along the Pacific North American coast (COI genetic divergence ranged from 4.4 to 14 %).…”

Section: Taxonomic Issuessupporting

confidence: 89%

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: 89%

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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“…For instance, two lumpsucker species with different morphology were found to have identical sequences for multiple genes and to actually represent one sexually dimorphic species [93]. Moreover, DNA barcodes could be incorporated into large phylogenies [94,95], or used for inferring preliminary phylogeographic patterns [96].…”

Section: Progress In Dna-based Inventories Of Marine Groupsmentioning

confidence: 99%

DNA Barcodes for Marine Biodiversity: Moving Fast Forward?

Radulovici¹,

Archambault²

2010

Diversity

160

106

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'Biodiversity' means the variety of life and it can be studied at different levels (genetic, species, ecosystem) and scales (spatial and temporal). Last decades showed that marine biodiversity has been severely underestimated at all levels. In order to investigate diversity patterns and underlying processes, there is a need to know what species live in the marine environment. An emerging tool for species identification, DNA barcoding can reliably assign unknown specimens to known species, also flagging potential cryptic species and genetically distant populations. This paper will review the role of DNA barcoding for the study of marine biodiversity at the species level.

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“…For instance, examination of DNA barcodes of hundreds of fish and bird species indicates that the first group has in average higher congeneric divergences (8.4 and 5.5, respectively;Ward 2009). A recent study on crustaceans of the genus Gammarus revealed a level of congeneric divergence (27%; Costa et al 2009) substantially higher than for vertebrates and invertebrates such as Lepidoptera (4.4-6.0%; Hajibabaei et al 2006).…”

Section: Molecular Rates Of Substitutionmentioning

confidence: 99%

New insights into molecular evolution: prospects from the Barcode of Life Initiative (BOLI)

Costa

Carvalho

2010

Theory Biosci.

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Geographic and temporal patterns of morphological and behavioral diversifications among species stimulated Darwin to propose a mechanism for evolutionary change through natural selection. Scientific developments have revealed an even more fundamental level of biological complexity: sequence variation in DNA. While genome projects yield spectacular insights into molecular evolution, they have targeted only a few species. In contrast, the Barcode of Life Initiative (BOLI) proposes a horizontal approach to genomics, examining short, standardized genome segments across the sweep of eukaryotic life, all 10 million species. BOLI will extend our understanding of evolution and speciation in varied ways. It will facilitate quantification of biological diversity by disclosing cryptic species and enabling a rapid survey of taxon diversity in groups that have hitherto received scant morphological examination. It will facilitate assignment of life history stages to known species and provide a first estimate of species ages. It will also reveal key features of the mitochondrial genome, because the evolutionary properties of barcodes relate to those in the mitochondrial genome as a whole, acting to flag taxonomic groups or species with unusual nucleotide composition or evolutionary rates. The growing volume of barcode records has revealed that sequence variability within species is generally much lower than divergence among species (barcoding gap), a pattern that occurs in diverse lineages, suggesting a pervasive evolutionary process. Low variability may reflect recurrent selective sweeps of favored mitochondrial variants propagating as single linkage units across species. If this hypothesis is substantiated, the implications are significant, particularly for our understanding of molecular evolution of mitochondrial DNA and its relationship with species delineation.

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Probing marineGammarus(Amphipoda) taxonomy with DNA barcodes

Cited by 110 publications

References 56 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)

DNA Barcodes for Marine Biodiversity: Moving Fast Forward?

New insights into molecular evolution: prospects from the Barcode of Life Initiative (BOLI)

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