Helminths of the mallard<i>Anas platyrhynchos</i>Linnaeus, 1758 from Austria, with emphasis on the morphological variability of<i>Polymorphus minutus</i>Goeze, 1782

Jirsa, Franz; Reier, Susanne; Smales, Lesley R.

doi:10.1017/s0022149x21000079

Cited by 2 publications

(1 citation statement)

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“…Morphological comparison also revealed the latter type to be more different than the other 2, suggesting it might be a non-indigenous form that was introduced with G. roeselii and captured G. pulex as a novel host (Grabner et al ., 2020 ). Nevertheless, certain variabilities in the morphological features of the proboscis seem inherent to acanthocephalans (Jirsa et al ., 2022 ). Considering its potential for host adaptation, PspT3 is the most likely candidate to assign the specimen obtained in this study from G. tigrinus .…”

Section: Discussionmentioning

confidence: 99%

Intermediate host patterns of acanthocephalans in the Weser river system: co-invasion vs host capture

Vogel

Taraschewski

2023

Parasitology

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Anthropogenic interference is a major driver of ecological change in freshwater ecosystems. Pollution and the introduction of new species not only alter macrozoobenthic community structures, but can also affect their respective parasite communities. The ecology of the Weser river system experienced a drastic decline in biodiversity over the past century due to salinization caused by the local potash industry. As a response, the amphipod Gammarus tigrinus was released into the Werra in 1957. A few decades after the introduction and subsequent spread of this North American species, its natural acanthocephalan Paratenuisentis ambiguus was recorded in the Weser in 1988, where it had captured the European eel Anguilla anguilla as a novel host. To assess the recent ecological changes in the acanthocephalan parasite community, we investigated gammarids and eel in the Weser river system. In addition to P. ambiguus, 3 Pomphorhynchus species and Polymorphus cf. minutus were discovered. The introduced G. tigrinus serves as a novel intermediate host for the acanthocephalans Pomphorhynchus tereticollis and P. cf. minutus in the tributary Werra. Pomphorhynchus laevis is persistent in the tributary Fulda in its indigenous host Gammarus pulex. Pomphorhynchus bosniacus colonized the Weser with its Ponto-Caspian intermediate host Dikerogammarus villosus. This study highlights the anthropogenically driven changes in ecology and evolution in the Weser river system. Based on morphological and phylogenetic identification, the shifts in distribution and host usage described here for the first time contribute to the puzzling taxonomy of the genus Pomphorhynchus in times of ecological globalization.

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Section: Discussionmentioning

confidence: 99%

Intermediate host patterns of acanthocephalans in the Weser river system: co-invasion vs host capture

Vogel

Taraschewski

2023

Parasitology

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Occurrence of Gastrointestinal Parasites in Synanthropic Neozoan Egyptian Geese (Alopochen aegyptiaca, Linnaeus 1766) in Germany

Fischer

Recht²,

Vélez

et al. 2023

Diversity

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Various studies have shown that the transmission and passage of alien and native pathogens play a critical role in the establishment process of an invasive species and its further spread. Egyptian geese (Alopochen aegyptiaca) are neozotic birds on various continents. They live not only in the countryside near fresh water bodies but also in urban habitats in Central Europe with close contact to humans and their pets. Although their rapid distribution in Europe is widely debated, scientific studies on the anthropozoonotic risks of the population and studies on the present endoparasites in Egyptian geese are rare worldwide. In the present study, 114 shot Egyptian geese and 148 non-invasively collected faecal samples of wild Egyptian geese from 11 different Federal States in Germany were examined. A total of 13 metazoan endoparasite species in 12 different genera were identified. The main endoparasites found were Hystrichis tricolor, Polymorphus minutus, and, in lesser abundance, Cloacotaenia sp. and Echinuria uncinata. Adult stages of Echinostoma revolutum, an anthropozoonotic heteroxenic trematode, were found in 7.9% of the animals examined postmortem. This species was additionally identified by molecular analysis. Although Egyptian geese live in communities with native waterfowl, it appears that they have a lower parasitic load in general. The acquisition of generalistic parasites in an alien species and the associated increased risk of infection for native species is known as “spill-back” and raises the question of impacts on native waterfowl. Differences between animals from rural populations and urban populations were observed. The present study represents the first large-scale survey on gastrointestinal parasites of free-ranging Egyptian geese.

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Helminths of the mallardAnas platyrhynchosLinnaeus, 1758 from Austria, with emphasis on the morphological variability ofPolymorphus minutusGoeze, 1782

Cited by 2 publications

References 40 publications

Intermediate host patterns of acanthocephalans in the Weser river system: co-invasion vs host capture

Intermediate host patterns of acanthocephalans in the Weser river system: co-invasion vs host capture

Occurrence of Gastrointestinal Parasites in Synanthropic Neozoan Egyptian Geese (Alopochen aegyptiaca, Linnaeus 1766) in Germany

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