Morphological and molecular evidence for a new species of Pseudanisakis Layman &amp; Borovkova, 1926 (Nematoda: Ascaridida), parasitizing Rajiformes in southern Southwest Atlantic waters

Irigoitia, Manuel Marcial; Braicovich, Paola E.; Farber, Marisa Diana; Timi, Juan T.

doi:10.1007/s00436-017-5482-2

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Current knowledge restricts the distribution of D. brevicaudatus to Atlantic waters (Gabbanelli et al, 2018); therefore, only those parasites reported in this region must be considered as representative of its parasite fauna, including two monogeneans (Irigoitia et al, 2014; Irigoitia, Chisholm & Timi, 2016), a myxozoan (Cantatore et al, 2018), three nematodes (Irigoitia et al, 2017; Irigoitia et al, 2018) and a cestode (Franzese & Ivanov, 2020). All previous records of parasites from Pacific waters relate to D. chilensis (Fernandez & Villalba, 1985; Aburto, Torres & Lamilla, 2008; Alves et al, 2017) and it is likely that these Dipturus species share some parasites among those of low host specificity such as larval anisakids.…”

Section: Discussionmentioning

confidence: 99%

“…Studies on the parasite fauna of D. brevicaudatus are mostly restricted to taxonomic investigations (Irigoitia et al, 2014; Irigoitia, Chisholm & Timi, 2016; Irigoitia et al, 2017; Cantatore et al, 2018; Irigoitia et al, 2018; Franzese & Ivanov, 2020), with no information available on the structure of its parasite assemblages. However, larval anisakid nematodes display latitudinal patterns in several skate species, including D. brevicaudatus (as Zearaja chilensis ), increasing in both prevalence and abundance with increasing latitude (Irigoitia et al, 2018) and representing potential indicators for stock identification.…”

Section: Introductionmentioning

confidence: 99%

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Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Irigoitia

Levy

Canel

et al. 2022

Aquatic Conservation

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1. Populations of chondrichthyans are particularly sensitive to elevated fishing mortality due to their low reproductive potential and very low population growth.2. Dipturus brevicaudatus is a common and endemic skate from waters of Argentina and is frequently caught as by-catch and is therefore extremely vulnerable to commercial fishing. There are signs of overfishing in both the northern and southern Argentine Sea and the species has been classified as 'Vulnerable' by the International Union for Conservation of Nature. 3. A parasitological examination of 96 skates revealed 1,913 individual macroparasites belonging to 18 species and one myxozoan. Three parasite species were long-lived and were suitable biological tags, resulting in statistically significant differences between North Patagonic and both Buenos Aires and South Patagonic regions and therefore can be used to identify stocks of D. brevicaudatus. The inclusion of short-lived parasites in the analyses suggested the existence of three stocks. 4. Parasite assemblages from the northern Argentine Sea (Buenos Aires, Argentine biogeographical province) and from Patagonian waters (North and South Patagonic, Magellanic biogeographical province) varied in terms of parasite infracommunity species richness and the relative abundance of parasite guilds.5. Using parasites to infer the existence of three stocks of D. brevicaudatus provides the basis to help establishing management and recovery strategies to preserve the diversity of this vulnerable skate in the south-west Atlantic Ocean.6. Due to the low host specificity of the long-lived parasite tags, there is potential to extend this methodology to other skate species that are commercially exploited in the region, whose population structures remain unknown.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Irigoitia

Levy

Canel

et al. 2022

Aquatic Conservation

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“…The application of SEM is not restricted to few taxa of nematode parasitizing marine fish in the Americas; it has been practically mandatory for taxonomic studies regarding these parasites during the last 20 years, proving to be very important for the description of new species (e.g. Vieira et al ., 2015; Irigoitia et al ., 2017; Aguilar-Aguilar et al ., 2019; Moravec et al ., 2020, 2021), as well as for improving the knowledge of poorly known taxa and resolution of taxonomic issues (e.g. Mejía-Madrid and Aguirre-Macedo, 2011 a ; Pereira et al ., 2015; Moravec et al ., 2017; Sardella et al ., 2017).…”

Section: Advances In the Taxonomic And Phylogenetic Knowledgementioning

confidence: 99%

Review of the parasitic nematodes of marine fishes from off the American continent

Pereira

González-Solís

2022

Parasitology

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The ichthyofauna of the Atlantic and Pacific coasts off the American continent is very rich. Consequently, a high biodiversity of nematodes parasitizing these vertebrates is also expected. Currently, data on nematode parasites of marine fish off the Americas are fragmented. A review of all adult nematode species reported parasitizing marine fish from off the American continent is herein presented, as well as comments on their patterns of diversity, life cycles and advances in the taxonomic and phylogenetic knowledge. A total of 209 valid species, 19 species inquirendae and 6 dubious records have been recorded, the majority from the fish taxa Eupercaria and Perciformes. The families Sciaenidae, Serranidae and Lutjanidae, as well as the tropical and temperate Atlantic waters, exhibited the highest records of parasitic nematodes. The Cucullanidae, Philometridae and Cystidicolidae were the most speciose families of nematodes, which may be related to technological advances and relatively recent efforts of taxonomists, resulting in description of new taxa and the resolution of taxonomic problems. Numerous taxonomic questions still need resolution and, even though genetic data have been important for this process, the database is very scarce. This is the first review on all currently known nematode species parasitizing marine fish off the Americas and may serve as an important basis of reference for future approaches on these organisms.

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“…Pseudanisakis argentinensis Irigoitia et al (2017) Pseudanisakis tricupola Order Ascaridida; Family Anisakidae Anisakis sp. (type I) Pseudoterranova sp.…”

Section: Grillotia Dollfusimentioning

confidence: 99%

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Vargas-Caro¹

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Longnose skates may be one of the most vulnerable taxa of elasmobranch fishes, with documented local extinctions and population declines worldwide. Longnose skates are the main component of the commercial elasmobranch fisheries in the south-east Pacific Ocean, especially in Chilean waters where target and bycatch fisheries have led two species to the brink of collapse. The yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma are endemic of southern South America yet little is known about population ecology and stock structure.Additionally, the external morphology of longnose skates is remarkably similar, especially in early life stages, and a lack of accurate species identification has compromised official landings records which in turn has impacted fishery management. Overall abundance of longnose skates has declined substantially over the last decade due to intensive fishing pressure and the fishery is considered to be `fully exploited'.Based on all available information in peer-reviewed and grey literature, a comparative synthesis of the biology and ecology was conducted on Z. chilensis and D. trachyderma. A positive increase in relation to scientific knowledge over the past decade was noticeable, although several basic aspects of their biology and ecology are still missing. There is an urgent need to fill knowledge gaps on, for example, movement patterns, feeding ecology and habitat use, population size and structure, and levels of connectivity. In this study, taxonomic clarity was provided, and relevant information with regard to the biology, ecology and fisheries that interact with longnose skates was collated.Confusion of identity between longnose skates occurs to the present day. In order to address this issue, morphometric and genetic tools are provided to aid in species identification of early-life stage specimens. Thirty-seven morphometric measurements and three meristic characters were used to identify specimens. These results suggest that the number of midline, nuchal and inter-dorsal thorns could be used to discriminate between specimens of Z. chilensis and D. trachyderma. Previously, the presence of a single nuchal thorn was considered to be a feature that could be used to separate species, however, this morphological feature has proven to be variable in Z. chilensis. Additionally, partial sequences of the 16S, cox1, nadh2 and the control regions of the mitochondrial DNA were amplified and analysed for intraspecific and interspecific divergence. Amplified fragments of cox1 gene and the control region contained information to separate the target species; however, specimens of D. trachyderma and Z. chilensis were grouped indistinctly within a single clade using 16S and nadh2 fragments.-iiiThe evolutionary history of Zearaja was also explored, in a broad taxonomic context by using whole mitochondrial genomes (mitogenomes) to understand higher-level phylogenetic relationships among batoids. A data set of 56 mitogenomes of 47 batoids and four outgroups was analysed. O...

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Morphological and molecular evidence for a new species of Pseudanisakis Layman & Borovkova, 1926 (Nematoda: Ascaridida), parasitizing Rajiformes in southern Southwest Atlantic waters

Cited by 4 publications

References 32 publications

Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Review of the parasitic nematodes of marine fishes from off the American continent

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

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