12 results on '"Diaz, Julia I."'
Search Results
2. Phylogenetic relationship between Contracaecum spp. (Nematoda, Anisakidae) parasitizing cormorants (Aves, Phalacrocoracidae) in Argentina.
- Author
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Garbin, Lucas E., Servián, Andrea, Fuentes, Lautaro, Morgenthaler, Annick, Millones, Ana, Fuchs, Daniela, Diaz, Julia I., and Navone, Graciela T.
- Abstract
Species of the genus Contracaecum (Family Anisakidae) exhibit a broad host and geographical distribution, parasitizing aquatic organisms such as piscivorous birds and mammals as their definitive hosts. Several Contracaecum species have been reported parasitizing cormorants (Family: Phalacrocoracidae) in South America. The objective of this study was to highlight phylogenetic relationships between Contracaecum species parasitizing cormorants based on both molecular analyses and the papillae arrangement on the male tail. Some Contracaecum species parasitizing Red-legged cormorants from the Ría Deseado (RD), and other nematodes parasitizing eight Neotropic cormorants from San Miguel del Monte lagoon (SMML), Argentina, were collected and analyzed. Both morphological and phylogenetic analyses allowed us to recognize two species: Contracaecum chubutensis parasitizing Phalacrocorax gaimardi, and Contracaecum australe parasitic in Phalacrocorax brasilianus. According to the obtained sequences (mtDNA cox2, ITS1, ITS2, and SSrRNA), Contracaecum sp. parasitizing P. gaimardi exhibited concordance with the previously reported C. chubutensis parasitizing P. atriceps from Bahía Bustamante, Chubut province. Likewise, Contracaecum sp. isolates parasitizing P. brasilianus showed concordance with C. australe from Chile. Besides, the papillae arrangement on the male tail allowed us to understand the interspecific and genetic relationships between the Contracaecum species. The analyses confirm that C. chubutensis specimens parasitizing P. gaimardi from RD present a new host record for the species, whereas, those C. australe specimens parasitizing P. brasilianus from SMML provide a new geographical record for the species and the extension of its distribution range. Present results also confirm the inland and marine distribution of C. australe and C. chubutensis, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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3. A new species of Maritrema (Trematoda: Microphallidae) parasitizing the Baird's sandpiper Calidris bairdii, and comments about diversity of Microphallidae in two Nearctic shorebirds at Patagonian sites in Argentina.
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Capasso, Sofia, D'Amico, Verónica L., and Diaz, Julia I.
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TREMATODA , *SANDPIPERS , *SHORE birds , *ACETABULUM (Anatomy) , *SPECIES distribution - Abstract
Graphical abstract Highlights • A new Trematoda species is described parasitizing Sandpipers in Patagonia, Argentina. • We analyze and compare the microphallid diversity in two migratory bird species. • We correlated results with some ecological characteristics of both host species. Abstract Birds are hosts of a wide diversity of trematodes. Between them, the Microphallidae is a common family with a cosmopolitan distribution. Nevertheless, only 10 Maritrema species have been recorded previously in South America. The aim of the present paper is to describe a new species of Maritrema parasitizing the Nearctic Baird's sandpiper, Calidris bairdii in its wintering areas in Patagonia, Argentina. We also analyze and compare the microphallid diversity in two host species. We collected 44 C. bairdii and 50 Calidris fuscicollis in search of helminths. Trematodes were found only in C. bairdii. A total of 694 trematodes belonging to 4 microphallid species were found parasitizing the intestine and caeca. Four microphallid species were found: Maritrema formicae , Odhneria odhneri , Levinseniella cruzi and Maritrema pichi n. sp. M. formicae showed the highest prevalence, while M. pichi n. sp. was the species with the highest mean intensity and mean abundance. The new species M. pichi n. sp. differs from congeners by the position of the acetabulum that is included within the vitellarium ring, the ovary is anterior to the acetabulum, and the testes are lateral to it. We discuss the parasitological results in relation with the biological and ecological characteristics of both different host species. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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4. Gastrointestinal helminths of two storm-petrel species, Oceanites oceanicus and Fregetta tropica, (Aves: Oceanitidae) from Antarctica.
- Author
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Fusaro, Bruno, Lorenti, Eliana, Panisse, Guillermo, Fornillo, María Valentina, Fuentes, Lautaro, Libertelli, Marcela, Ansaldo, Martin, and Diaz, Julia I.
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HELMINTHS , *HOST-parasite relationships , *PARASITIC diseases , *SPECIES , *MIGRATORY birds , *KRILL , *NEMATODES - Abstract
Although knowledge about parasitic diseases in Antarctic birds is scarce, an increasing number of studies is currently being carried out in this area. A better knowledge of host-parasite relationships in Antarctic seabirds is key to understanding trophic ecology and epidemiology of infection diseases, especially in those birds with extensive migratory routes that can act as reservoirs and distributors of diseases. This study aims to provide information on helminths of two storm-petrel species, the Wilson's Storm-Petrel Oceanites oceanicus and the Black-bellied Storm-Petrel Fregetta tropica (Oceanitidae). Twenty freshly dead individuals were analysed: 18 O. oceanicus (8 adults, 10 chicks) and 2 F. tropica (adults). Fifteen O. oceanicus were parasitized with the nematode Stegophorus macronectes, whereas the two F. tropica were parasitized by at least one of three parasite species identified: S. macronectes, Seuratia sp., and Tetrabothrius sp. The low richness of parasites may be associated with a stenophagic diet. However, a clear difference is observed between both host species that could be related to a higher fish ingestion by F. tropica, unlike O. oceanicus with a higher ingestion of krill. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. Surveillance of avian malaria and related haemoparasites in common terns (Sterna hirundo) on the Atlantic coast of South America.
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Capasso, Sofía, Schumm, Yvonne R., Quillfeldt, Petra, Bonsergent, Claire, Malandrin, Laurence, Lorenti, Eliana, Fusaro, Bruno, Panisse, Guillermo, Lunardelli, Melina, Castresana, Gabriel, and Diaz, Julia I.
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AVIAN malaria , *BABESIA , *PLASMODIUM , *CYTOCHROME b , *TERNS , *MIGRATORY birds , *STERNUM , *BIRD food - Abstract
Haemosporidia (Apicomplexa, Haemosporida) are protozoa that infect vertebrate blood cells and are transmitted by vectors. Among vertebrates, birds possess the greatest diversity of haemosporidia, historically placed in 3 genera: Haemoproteus , Leucocytozoon and Plasmodium , the causative agent of avian malaria. In South America, existing data on haemosporidia are spatially and temporally dispersed, so increased surveillance is needed to improve the determination and diagnosis of these parasites. During the non-breeding season in 2020 and 2021, 60 common terns (Sterna hirundo) were captured and bled as part of ongoing research on the population health of migratory birds on the Argentinian Atlantic coast. Blood samples and blood smears were obtained. Fifty-eight samples were screened for Plasmodium , Haemoproteus and Leucocytozoon , as well as for Babesia parasites by nested polymerase chain reaction and by microscopic examination of smears. Two positive samples for Plasmodium were found. The cytochrome b lineages detected in the present study are found for the first time, and are close to Plasmodium lineages found in other bird orders. The low prevalence (3.6%) of haemoparasites found in this research was similar to those reported for previous studies on seabirds, including Charadriiformes. Our findings provide new information about the distribution and prevalence of haemosporidian parasites from charadriiforms in the southernmost part of South America, which remains understudied. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. The helminth community structure as an indicator of habitat use: the case of the Baird's Sandpiper (Calidris bairdii) and the White-Rumped Sandpiper (Calidris fuscicollis) on their non-breeding grounds in Patagonia.
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Capasso, Sofia, D'Amico, Verónica L., Minardi, Graciela, and Diaz, Julia I.
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SANDPIPERS , *BIRD communities , *MIGRATORY animals , *BIRD migration , *HABITATS , *FACTOR structure - Abstract
During migrations, birds are exposed to a wide variety of parasites. It has been suggested that shorebird migration and other movements play a critical role in structuring their parasite communities. The objective of this study was to characterize the helminth communities of two sympatric Nearctic migratory shorebird species in their non-breeding grounds in Argentine Patagonia and to assess what factors influence their structuring. The migration of these two bird species span from pole to pole as they breed in the Canadian Arctic and winter at southernmost South America. In contrast to the Arctic, the helminth communities of these birds have never been studied at their austral non-breeding sites. A total of 44 Calidris bairdii and 50 Calidris fuscicollis collected at various coastal marine and inland sites were analyzed for helminths. Ecological parameters were calculated at component community (host population) and infracommunity (single individual hosts) levels. A total of 26 helminth taxa were found, included in 14 families and 20 genera. Results showed that parasite richness and total prevalence were higher in C. bairdii than in C. fuscicollis. Richness, diversity, dominance and abundance values in the infracommunities were generally low, being lower in C. fuscicollis. The infracommunities were characterized by being heterogeneous, unstructured and unpredictable. Possible causes of this pattern are discussed. It is clear that multiple factors influence parasitic diversity; however, considering our observations, we think that habitat use is possibly the main structuring factor of the helminth communities of these two shorebird species. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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7. Two new genera and species of avian schistosomes from Argentina with proposed recommendations and discussion of the polyphyletic genus Gigantobilharzia (Trematoda, Schistosomatidae).
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Lorenti, Eliana, Brant, Sara V., Gilardoni, Carmen, Diaz, Julia I., and Cremonte, Florencia
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SCHISTOSOMA , *TREMATODA , *SPECIES , *FRESH water , *COASTS - Abstract
Gigantobilharzia Odhner, 1910 (Schistosomatidae) includes species that parasitize several orders of birds and families of gastropods from both freshwater and marine environments worldwide. Due to their delicate bodies, most of the species descriptions are incomplete, and lumped in the genus Gigantobilharzia, in some cases despite major morphological variability. Only three of those species have molecular sequence data but then lack a robust morphological description, making species differentiation very difficult. For this reason, several authors consider that many of the species of Gigantobilharzia should be reassigned to new genera. The aim of this paper is to describe two new genera and two new species of schistosomes using morphological and molecular characterization. We described Marinabilharzia patagonense n. g., n. sp. parasitizing Larus dominicanus from north Patagonian coast, and Riverabilharzia ensenadense n. g., n. sp. parasitizing L. dominicanus, Chroicocephalus maculipennis and Chroicocephalus cirrocephalus from freshwater Río de La Plata, in South America, Argentina. We then analysed and discussed the combinations of characters defining species of Gigantobilharzia and, based on that and on the available molecular data, we propose at least four possible new genera. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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8. Redescription and molecular characterization of Baruscapillaria spiculata (Nematoda: Capillariidae) parasitizing the Neotropic cormorant Phalacrocorax brasilianus from two Argentinian lagoons.
- Author
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Garbin, Lucas E., Digiani, María C., Robles, María R., Montes, Martín M., Knoff, Marcelo, Fuchs, Daniela, Montalti, Diego, and Diaz, Julia I.
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CORMORANTS , *LAGOONS , *NEMATODES , *GENETIC distance , *RECOMBINANT DNA - Abstract
Two species of intestinal Capillariidae were hitherto known from the Neotropic cormorant Phalacrocorax brasilianus, Baruscapillaria spiculata (Freitas, 1933), and Baruscapillaria appendiculata (Freitas, 1933). The original descriptions are very short and brief, and further reports of both species are scarce and/or confusing. This paper provides a morphological redescription and molecular characterization, based on the partial 18S rDNA gene, of B. spiculata specimens parasitizing the Neotropic cormorant in two continental lagoons from Buenos Aires province, Argentina. Both morphological and morphometrical differences between B. spiculata and B. appendiculata are highlighted on the examination of available type material. Additionally, two previous reports of B. appendiculata from Mexico and Brazil are discussed. A phylogenetic analysis conducted on specimens of B. spiculata and 46 other capillariid isolates available from the GenBank demonstrated a sister-taxon relationship between our specimens and the type species of Baruscapillaria. But, at the same time, significant genetic distances between both taxa showed an interesting variability of the genus Baruscapillaria. The probable division of this genus into multiple genera could probably be confirmed through integrative studies including more species. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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9. Notocotylus chionis (Trematoda: Notocotylidae) and Notocotylus sp. from shorebirds in southern Patagonian wetlands of Argentina: morphological and molecular studies.
- Author
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Capasso, Sofía, Servián, Andrea, Tkach, Vasyl V., and Diaz, Julia I.
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SHORE birds , *TREMATODA , *RIBOSOMAL DNA , *WETLANDS , *MIGRATORY birds , *MIGRATORY animals , *TUNDRAS - Abstract
Southernmost South America provides significant wintering habitats for migrant shorebirds, most of which breed in the High Arctic tundra. Helminth species parasitizing these migratory birds have been well studied in North America; however, in South America they are poorly known. As part of an ongoing research on the helminth fauna from Patagonian birds in Argentina, we report Notocotylus chionis and Notocotylus sp. (Trematoda: Notocotylidae) parasitizing three shorebird species, the Nearctic migrants Calidris fuscicollis (WRSA) and Calidris bairdii (BASA) (Scolopacidae), and the Neotropical Charadrius falklandicus (TBPL) (Charadriidae). We provide a new morphological description of N. chionis considering that the previous one reported from the snowy sheathbill on Subantarctic islands are incomplete and based on few specimens. We also provided a morphometric characterization of Notocotylus sp. We obtained molecular data which confirmed the identification of specimens recovered from WRSA and TBPL as N. chionis. Phylogenetic analysis based on 28S ribosomal DNA sequences was performed. The results placed N. chionis close to other Patagonian species native to South America (i.e. N. primulus). Notocotylus chionis was found previously in the snowy sheathbill which inhabits in coasts of southern South America, Antarctic Peninsula and surrounding islands. Present finding in resident birds (TBPL) allows us to hypothesize that N. chionis is a Neotropical species whose life cycle is being completed in southern South America and Subantarctic islands and represents a valuable contribution to the knowledge of parasite diversity in the austral subpolar region of the western hemisphere. [ABSTRACT FROM AUTHOR]
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- 2020
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10. Age-Related Differences in the Gastrointestinal Microbiota of Chinstrap Penguins (Pygoscelis antarctica).
- Author
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Barbosa, Andrés, Balagué, Vanessa, Valera, Francisco, Martínez, Ana, Benzal, Jesús, Motas, Miguel, Diaz, Julia I., Mira, Alex, and Pedrós-Alió, Carlos
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GUT microbiome , *CHINSTRAP penguin , *ANIMAL welfare , *MICROBIAL ecology , *PROTEOBACTERIA - Abstract
The gastrointestinal tract microbiota is known to play very important roles in the well being of animals. It is a complex community composed by hundreds of microbial species interacting closely among them and with their host, that is, a microbial ecosystem. The development of high throughput sequencing techniques allows studying the diversity of such communities in a realistic way and considerable work has been carried out in mammals and some birds such as chickens. Wild birds have received less attention and in particular, in the case of penguins, only a few individuals of five species have been examined with molecular techniques. We collected cloacal samples from Chinstrap penguins in the Vapour Col rookery in Deception Island, Antarctica, and carried out pyrosequencing of the V1-V3 region of the 16S rDNA in samples from 53 individuals, 27 adults and 26 chicks. This provided the first description of the Chinstrap penguin gastrointestinal tract microbiota and the most extensive in any penguin species. Firmicutes, Bacteoridetes, Proteobacteria, Fusobacteria, Actinobacteria, and Tenericutes were the main components. There were large differences between chicks and adults. The former had more Firmicutes and the latter more Bacteroidetes and Proteobacteria. In addition, adults had richer and more diverse bacterial communities than chicks. These differences were also observed between parents and their offspring. On the other hand, nests explained differences in bacterial communities only among chicks. We suggest that environmental factors have a higher importance than genetic factors in the microbiota composition of chicks. The results also showed surprisingly large differences in community composition with other Antarctic penguins including the congeneric Adélie and Gentoo penguins. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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11. Molecular identification and larval morphological description of Contracaecum pelagicum (Nematoda: Anisakidae) from the anchovy Engraulis anchoita (Engraulidae) and fish-eating birds from the Argentine North Patagonian Sea.
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Garbin, Lucas E., Mattiucci, Simonetta, Paoletti, Michela, Diaz, Julia I., Nascetti, Giuseppe, and Navone, Graciela T.
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ANISAKIDAE , *MOLECULAR biology , *PISCIVOROUS birds , *HOST-parasite relationships , *RIBOSOMAL DNA - Abstract
Anisakids use invertebrates as paratenic and/or intermediate hosts as a basic feature of larval transmission. The third-stage larva usually develops in invertebrates which are prey items of finfish paratenic hosts. Contracaecum larvae molt twice inside the egg and hatch as free third-stage larvae ensheathed in the second-stage larval cuticle. Copepods act as paratenic or obligatory hosts, usually ingesting these free L3 larvae, and fish act as intermediate/paratenic or metaparatenic hosts preying on infected copepods. Fish-eating birds acquire L3 larvae by ingesting infected fish where they develop into the fourth-stage larvae and adults. Objectives of this work were to establish the specific correspondence between Contracaecum pelagicum L3 larvae parasitizing the anchovy Engraulis anchoita, and the adults parasitizing the Magellanic penguin Spheniscus magellanicus and the Imperial shag Phalacrocorax atriceps through the use of molecular markers; and, to evaluate the anisakid L3 larval recruitment and infection caused by ingestion of anchovy by S. magellanicus. Sixteen specimens of Contracaecum L3 larvae were analyzed from E. anchoita from Bahía Engaño, Chubut, eight adult nematodes from S. magellanicus and six adult specimens from P. atriceps both from the Valdés Peninsula, Chubut. All nematodes were sequenced for three genes: mitochondrial cytochrome oxidase 2 (mtDNA cox2), mitochondrial ribosomal RNA (rrnS), and the internal transcribed spacers (ITS-1 and ITS-2) of the nuclear ribosomal DNA region. Phylogenetic analyses were performed by using Maximum Parsimony (MP) analysis by PAUP. In addition, studies under SEM and LM were carried out on L3 larvae. All L3 individuals from E. anchoita, adults from S. magellanicus, and P. atriceps clustered in the same clade, well supported in the MP tree inferred from the mtDNA cox2, and rrnS gene sequences analyses. Further, the sequence alignments of L3 larvae and adults of C. pelagicum here obtained at the ITS-1 and ITS-2 regions of the rDNA matched the sequences of C. pelagicum previously deposited by us in GenBank. Nematode recruitment (Ro) was equal to 33.07 (7.20–91.14) L3 larvae for C. pelagicum in each penguin's meal of anchovy. The MP tree topologies obtained from mtDNA cox2 and rrnS genes demonstrated that specimens of Contracaecum L3 larvae from E. anchoita and C. pelagicum from S. magellanicus as well as from P. atriceps constitute a unique clade, well-distinct and supported from all the others formed by the Contracaecum spp. sequenced so far for these genes. Molecular markers are considered to be an effective tool to elucidate larval transmission. The Contracaecum L3 larval recruitment value showed that many worms fail to establish in the bird digestive tract, probably because they are below a critical size. Further work is needed to elucidate other factors (e.g., physiological, immunological) that control nematode populations in the penguin digestive tract. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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12. Risk assessment of SARS-CoV-2 in Antarctic wildlife.
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Barbosa, Andrés, Varsani, Arvind, Morandini, Virginia, Grimaldi, Wray, Vanstreels, Ralph E.T., Diaz, Julia I., Boulinier, Thierry, Dewar, Meagan, González-Acuña, Daniel, Gray, Rachael, McMahon, Clive R., Miller, Gary, Power, Michelle, Gamble, Amandine, and Wille, Michelle
- Abstract
The coronavirus disease 2019 (COVID-19) pandemic is caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This pathogen has spread rapidly across the world, causing high numbers of deaths and significant social and economic impacts. SARS-CoV-2 is a novel coronavirus with a suggested zoonotic origin with the potential for cross-species transmission among animals. Antarctica can be considered the only continent free of SARS-CoV-2. Therefore, concerns have been expressed regarding the potential human introduction of this virus to the continent through the activities of research or tourism to minimise the effects on human health, and the potential for virus transmission to Antarctic wildlife. We assess the reverse-zoonotic transmission risk to Antarctic wildlife by considering the available information on host susceptibility, dynamics of the infection in humans, and contact interactions between humans and Antarctic wildlife. The environmental conditions in Antarctica seem to be favourable for the virus stability. Indoor spaces such as those at research stations, research vessels or tourist cruise ships could allow for more transmission among humans and depending on their movements between different locations the virus could be spread across the continent. Among Antarctic wildlife previous in silico analyses suggested that cetaceans are at greater risk of infection whereas seals and birds appear to be at a low infection risk. However, caution needed until further research is carried out and consequently, the precautionary principle should be applied. Field researchers handling animals are identified as the human group posing the highest risk of transmission to animals while tourists and other personnel pose a significant risk only when in close proximity (< 5 m) to Antarctic fauna. We highlight measures to reduce the risk as well as identify of knowledge gaps related to this issue. Unlabelled Image • Conditions in Antarctica could be favourable for SARS-CoV-2 stability. • In silico analyses revealed that Cetaceans have a higher susceptibility to the virus. • Seals and birds seem to have a lower risk of infection. • Wildlife researchers have the highest risk of transmission to Antarctic fauna. • Tourists can be potential vectors for SARS-CoV-2 transmission to Antarctic fauna. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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