Hybridization between Anguillicola crassus and A. novaezelandiae, and viability of the F1 generation

For decades, it has remained unclear how the Asian swim bladder nematode Anguillicola crassus was able to supplant the previously stable population of its relative from New Zealand Anguillicola novaezelandiae in the Lake Bracciano, Italy. Previously, researchers have hypothesized that A. crassus pos...

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Bibliographic Details
Published in:Journal of helminthology 2022-03, Vol.96, p.e22-e22, Article e22
Main Authors: Honka, K.I., Grabner, D., Sures, B.
Format: Article
Language:English
Subjects:
Air Sacs
Anguilla
Anguillicola crassus
Animals
Coral reefs
Dracunculoidea
Ecosystems
Eggs
Female
Females
Fish Diseases
Habitats
Humans
Hybridization
Hybridization, Genetic
Immune system
Lakes
Life cycle
Life cycles
Male
Males
Microscopy
Nematodes
Nonnative species
Offspring
Parasites
Population
Research Paper
Swim bladder
Worms
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Summary:For decades, it has remained unclear how the Asian swim bladder nematode Anguillicola crassus was able to supplant the previously stable population of its relative from New Zealand Anguillicola novaezelandiae in the Lake Bracciano, Italy. Previously, researchers have hypothesized that A. crassus possesses an ecological advantage due to a more efficient life cycle in combination with a pattern of unidirectional hybridization between A. novaezelandiae females and A. crassus males. The present study focuses on the viability of hybrid offspring and their allelic pattern, particularly in developed adult stages of the hybrid F1 generation. While the percentages of hybrid individuals from A. novaezelandiae mothers and A. crassus fathers increased from egg to adult stages, it was more distinct in egg stages of A. crassus females and A. novaezelandiae males, but did not occur in adult F1 individuals at all. Therefore, we corroborate the hypothesis of unidirectional hybridization by differentiating between egg and adult stages, and suggest this as another explanatory factor for the extinction of A. novaezelandiae in Lake Bracciano in Italy and the predominance of A. crassus.
ISSN:0022-149X
1475-2697
DOI:10.1017/S0022149X22000104