Morphological and molecular sequence analysis of the harmful shell boring species of Polydora (Polychaeta: Spionidae) from Japan and Australia

Sato-Okoshi, Waka; Abe, Haruo

doi:10.1016/j.aquaculture.2012.08.046

Cited by 32 publications

(16 citation statements)

References 22 publications

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“…the so-called polydorid spionid annelids, are well known for inhabiting burrows excavated in mollusc shells or mud tubes in crevices on the surfaces of the shells (Blake, 1996; Sato-Okoshi, 1999, 2000; Simon & Sato-Okoshi, 2015). Among the species which utilize commercially important mollusc shells as a habitat, many are increasingly regarded as harmful invaders from the perspective of aquaculture as they often reduce the commercial value of the molluscs by damaging their shells, decreasing their growth rate and meat yield, and causing heavy mortality (Mori et al , 1985; Okoshi & Sato-Okoshi, 1996; Sato-Okoshi & Takatsuka, 2001; Lleonart et al ., 2003; Simon et al , 2006; Sato-Okoshi & Abe, 2012; Sato-Okoshi et al , 2015). These species have therefore become targets for monitoring and tracking in aquaculture towards reducing infestation.…”

Section: Introductionmentioning

confidence: 99%

And then there was one:Polydora uncinataandPolydora hoplura(Annelida: Spionidae), the problematic polydorid pest species represent a single species

et al. 2016

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It is necessary to monitor shell-associated polydorid worms owing to the risk that they pose to commercially important molluscs. This requires accurate identification, but is often hampered by morphological similarities among species, insufficient type specimens, and abridged species descriptions. Thus morphological characteristics and molecular sequences of the most harmful polydorid species, Polydora uncinata from Japan and Australia and Polydora hoplura from South Africa were compared to determine whether they represent two morphologically similar, but genetically distinct species, or a single species. A wide range of morphological variation (with respect to size, length of caruncle and pigmentation patterns) was observed in each species and population, and their variations largely overlapped and revealed them to be at the intraspecific level of a single species. This was confirmed by gene sequences of nuclear 18S and 28S rRNA that were completely identical for P. uncinata and P. hoplura. The mitochondrial 16S rRNA and cyt b gene analyses also showed no genetic differences between these two species. The tree topology of the mitochondrial cyt b gene did not reflect geographic differences but instead suggests artificial transportation of the species. We recommend the synonymization of P. uncinata with P. hoplura.

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Section: Introductionmentioning

confidence: 99%

And then there was one:Polydora uncinataandPolydora hoplura(Annelida: Spionidae), the problematic polydorid pest species represent a single species

et al. 2016

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“…To date, molecular sequences for several genes have been published for only 13 of the 147 polydorid species in GenBank: Polydora brevipalpa, P. uncinata, P. aura, P. websteri, P. calcarea, P. haswelli, P. triglanda, P. ciliata, P. cornuta, P. giardi, Dipolydora carunculata, Boccardia proboscidea and Boccardiella ligerica (Walker 2011, Sato-Okoshi & Abe 2012, with the data for the 18S rRNA gene sequences only being available for P. brevipalpa, P. uncinata and P. aura (Sato-Okoshi & Abe 2012) and P. websteri, P. calcarea and P. haswelli (Sato-Okoshi & Abe in press) from Japan and Australia, P. triglanda from Taiwan (V. V. Pankova & V. I. Radashevsky unpubl. ), P. ciliata (source locality unstated) (S. Nadot & A.…”

Section: Taxonomymentioning

confidence: 99%

Morphology, 18S rRNA gene sequence and life history of a new Polydora species (Polychaeta: Spionidae) from northeastern Japan

Teramoto¹,

Sato-Okoshi²,

Abe³

et al. 2013

Aquat. Biol.

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A new species of spionid polychaete, Polydora onagawaensis, is described from mollusk shells in Pacific waters of northeastern Japan. Its nuclear 18S rRNA gene sequence as well as its morphology, reproductive features, life history and infestation characteristics are reported. Polydora onagawaensis sp. nov. belongs to the Polydora ciliata/websteri group and has a moderate size and variable black pigmentation on the palps and body. Up to 115 worms were found boring in a single scallop shell from suspended cultures in Onagawa Bay, with significantly higher numbers in the right than in the left valve. Females repeatedly deposited a string of egg capsules from around October to June (seawater temperature was below 15°C). The larvae developed inside the egg capsules for 2 wk (10°C, laboratory conditions), until the 3-chaetiger stage, before being released as planktonic larvae. The main spawning occurred in December, recruitment onto the shells increased after January, and most large worms disappeared between July and October. Thus, the estimated life span is around 1.5 yr after settlement. Details on biology and gene information not only contribute to distinguishing the species from other polydorids similar in morphology, but also allow control of polydorid infestation in mollusk aquaculture.

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“…While there are rare in stances where high infestations by polydorids occur under natural conditions (e.g. Poly do ra brevipalpa in the scallop Patino pecten yesso ensis and Polydora uncinata in the oyster Crasso strea gi gas [Sato-Okoshi & Abe 2012], and Di poly dora convexa, D. con cha rum and D. alborectalis in the scallop Patino pecten yessoensis in Japan [Sato-Okoshi 1999]), high in festation by a few polydorid species is observed more frequently in mollusc culture systems where intensive commercial culture may lead to the development of ecosystems which may encourage the proliferation of pests. For example, in South Africa, Chile and Australasia, farmed molluscs were typically infested by fewer species than are present on wild molluscs occurring close to farms (e.g.…”

Section: Introductionmentioning

confidence: 99%

Polydorid polychaetes on farmed molluscs: distribution, spread and factors contributing to their success

Simon¹,

Sato-Okoshi²

2015

Aquacult. Environ. Interact.

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Species of the Polydora-complex (i.e. polydorids) are the most common shell-boring polychaetes found on cultured molluscs. However, which species become problematic depend on their ability to reach mollusc farms and flourish under culture conditions. We therefore hypothesise that the planktonic larval phases of pest polydorids on molluscs grown on-shore will be short (as is typical of adelphophagic larvae, which can maintain large local populations) while those of polydorids on molluscs grown off-shore will be long (as is typical of planktotrophic larvae, which can disperse long distances to farms). Principal component and discriminant analyses of information extracted from the literature partly supported this hypothesis by identifying larval developmental mode and pest species as contributing more to pest status than host species and culture mode, with differential influence on pest status in different situations and potential bias through incorrect identification of polydorid species. χ 2 analyses confirmed that pest status depended on host culture method and pest larval mode. Pest polydorids producing adelphophagic larvae in on-shore systems may reflect the development of large local populations on hosts with culture periods > 2 yr. The many records of pests in off-shore and near-shore systems with pest species producing planktotrophic larvae may reflect shorter host culture periods and the higher incidence of planktotrophy among polydorid species in general. Polydora websteri, P. uncinata, P. hoplura and P. haswelli are the most frequently recorded and widespread pest species globally, although the taxonomy of these and shell-boring P. ciliata and Boccardia polybranchia need to be clarified. The positive relationships between the numbers of alien shell-borers and pests, and the number of hosts cultured per country confirm that mollusc aquaculture is an important vector and reservoir of alien pest polychaetes.

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Morphological and molecular sequence analysis of the harmful shell boring species of Polydora (Polychaeta: Spionidae) from Japan and Australia

Cited by 32 publications

References 22 publications

And then there was one:Polydora uncinataandPolydora hoplura(Annelida: Spionidae), the problematic polydorid pest species represent a single species

And then there was one:Polydora uncinataandPolydora hoplura(Annelida: Spionidae), the problematic polydorid pest species represent a single species

Morphology, 18S rRNA gene sequence and life history of a new Polydora species (Polychaeta: Spionidae) from northeastern Japan

Polydorid polychaetes on farmed molluscs: distribution, spread and factors contributing to their success

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