1
|
Infection patterns of helminth community in black rockcod Notothenia coriiceps in West Antarctica over a 6-year term. Parasitol Res 2023; 122:853-865. [PMID: 36737553 DOI: 10.1007/s00436-023-07785-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/22/2023] [Indexed: 02/05/2023]
Abstract
Patterns of the rockcod Notothenia coriiceps infection with helminths were analysed to understand the dynamics of parasite communities in this Antarctic fish and to test their stability over time. The study was performed using helminth samples collected from 183 N. coriiceps in 2014-2015 and 2020-2021 in the vicinity of the Ukrainian Antarctic station (UAS) "Akademik Vernadsky", Galindez Island, Argentine Islands, West Antarctica. Overall, 25 helminth taxonomical categories (nine trematodes, four cestodes, five nematodes, and seven acanthocephalans) were subjected to analysis. A direct comparison of the helminth population characteristics showed that nine species significantly changed their infection parameters during the 6 years between the samples. Seven of them (Pseudoterranova sp., Contracaecum sp., Ascarophis nototheniae, monolocular metacestodes, bilocular metacestodes, Metacanthocephalus rennicki, and Diphyllobothrium sp.) were found to have a significant impact on the differences between helminth infracommunities in 2014-2015 and 2020-2021. Most studied patterns of helminth component community appeared to show a stable tendency, and observed fluctuations were close to the steady trend. Slight but significant changes in the infection patterns observed in this study might have been caused by changes in the populations of intermediate, paratenic, and definitive hosts of helminths (marine invertebrates, mammals, and birds), which participate in helminth transmission in Antarctic ecosystems.
Collapse
|
2
|
Bao M, Olsen KM, Levsen A, Cipriani P, Giulietti L, Storesund JE, García-Seoane E, Karlsbakk E. Characterization of Pseudoterranova ceticola (Nematoda: Anisakidae) larvae from meso/bathypelagic fishes off Macaronesia (NW Africa waters). Sci Rep 2022; 12:17695. [PMID: 36271251 PMCID: PMC9587057 DOI: 10.1038/s41598-022-22542-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/17/2022] [Indexed: 01/18/2023] Open
Abstract
The genus Pseudoterranova includes parasite species of cetaceans and pinnipeds. The third stage larva (L3) of seal-infecting species occur in second intermediate or paratenic fish hosts mainly in neritic waters. This study firstly describes a Pseudoterranova L3 from meso/bathypelagic fishes off Macaronesia. L3s were morphologically and genetically studied by light microscopy and sequencing of the mtDNA cox2 and entire ITS rDNA genes. Bayesian inferences were performed with sequences from the larvae and selected sequences from GenBank. The nematode L3s were molecularly identified as Pseudoterranova ceticola, a parasite of kogiid whales. Such larvae were collected from Bolinichthys indicus, Chauliodus danae, Eupharynx pelecanoides, Diaphus rafinesquii, D. mollis, Diretmus argenteus and Maulisia argipalla. They mainly occurred in the viscera of these fishes. Pseudoterranova ceticola L3 were small (< 12 mm) and whitish, and a prominent characteristic is a circumoral ridge extending from the ventral boring tooth which differentiate them from Pseudoterranova spp. L3 maturing in pinnipeds and Terranova sensu lato larvae that mature in poikilotherms. The shape of the tail: conical, long, pointed, ventrally curved and lacking mucron also distinguish these larvae from those of the pinniped-infecting Pseudoterranova spp. Phylogenetic analyses based on mtDNA cox2 and ITS rDNA sequences suggest that P. ceticola is closely related to Skrjabinisakis spp., and not with Pseudoterranova spp. parasitizing pinnipeds. The related species Skrjabinisakis paggiae, S. brevispiculata and S. physeteris (until recently belonging to genus Anisakis), are as P. ceticola also parasites of physeteroid cetaceans. The morphology and morphological variation of the larvae of the cetacean parasite P. ceticola is thoroughly described for the first time. These L3 can readily be morphologically distinguished from those of the pinniped-infecting Pseudoterranova spp. The parasite likely completes its life cycle in the mesopelagic and bathypelagic realm, with meso/bathypelagic fish as 2nd intermediate or paratenic hosts and kogiids as final host. Thus, Pseudoterranova from cetaceans appear to be morphologically, genetically, and ecologically differentiated to those from pinnipeds, suggesting that they are not congeneric.
Collapse
Affiliation(s)
- Miguel Bao
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Kaja M. Olsen
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Arne Levsen
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Paolo Cipriani
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway ,grid.7841.aDepartment of public Health and Infectious Diseases, Section of Parasitology, Sapienza University of Rome, Rome, Italy
| | - Lucilla Giulietti
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Julia E. Storesund
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Eva García-Seoane
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway
| | - Egil Karlsbakk
- grid.10917.3e0000 0004 0427 3161Institute of Marine Research (IMR), Nordnes, PO Box 1870, N-5817 Bergen, Norway ,grid.7914.b0000 0004 1936 7443Department of Biological Sciences, University of Bergen, Bergen, Norway
| |
Collapse
|
3
|
DNA barcoding provides insights into Fish Diversity and Molecular Taxonomy of the Amundsen Sea. CONSERV GENET RESOUR 2022. [DOI: 10.1007/s12686-022-01273-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|