Sexual segregation of Echinorhynchus borealis von Linstow, 1901 (Acanthocephala) in the gut of burbot (Lota lota Linnaeus).
Identifieur interne : 000016 ( Main/Exploration ); précédent : 000015; suivant : 000017Sexual segregation of Echinorhynchus borealis von Linstow, 1901 (Acanthocephala) in the gut of burbot (Lota lota Linnaeus).
Auteurs : Arto Tuomainen [Finlande] ; E. Tellervo Valtonen [Finlande] ; Daniel P. Benesh [Finlande, États-Unis]Source :
- Folia parasitologica [ 0015-5683 ] ; 2015.
Abstract
Helminths often occupy defined niches in the gut of their definitive hosts. In the dioecious acanthocephalans, adult males and females usually have similar gut distributions, but sexual site segregation has been reported in at least some species. We studied the intestinal distribution of the acanthocephalan Echinorhynchus borealis von Linstow, 1901 (syn. of E. cinctulus Porta, 1905) in its definitive host, burbot (Lota lota Linnaeus). Over 80% of female worms were found in the pyloric caeca, whereas the majority of males were in the anterior two-thirds of the intestine. This difference was relatively consistent between individual fish hosts. Worms from different parts of the gut did not differ in length, so site segregation was not obviously related to worm growth or age. We found proportionally more males in the caeca when a larger fraction of the females were found there, suggesting mating opportunities influence gut distribution. However, this result relied on a single parasite infrapopulation and is thus tentative. We discuss how mating strategies and/or sexual differences in life history might explain why males and females occupy different parts of the burbot gut.
DOI: 10.14411/fp.2015.061
PubMed: 26580557
Affiliations:
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Benesh</name><affiliation wicri:level="1"><nlm:affiliation>Department of Biological and Environmental Science, University of Jyvaskyla, Finland;</nlm:affiliation><country xml:lang="fr">Finlande</country><wicri:regionArea>Department of Biological and Environmental Science, University of Jyvaskyla</wicri:regionArea><wicri:noRegion>University of Jyvaskyla</wicri:noRegion></affiliation><affiliation wicri:level="2"><nlm:affiliation>Marine Science Institute, University of California, Santa Barbara, CA, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Marine Science Institute, University of California, Santa Barbara, CA</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author></analytic><series><title level="j">Folia parasitologica</title><idno type="ISSN">0015-5683</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Helminths often occupy defined niches in the gut of their definitive hosts. In the dioecious acanthocephalans, adult males and females usually have similar gut distributions, but sexual site segregation has been reported in at least some species. We studied the intestinal distribution of the acanthocephalan Echinorhynchus borealis von Linstow, 1901 (syn. of E. cinctulus Porta, 1905) in its definitive host, burbot (Lota lota Linnaeus). Over 80% of female worms were found in the pyloric caeca, whereas the majority of males were in the anterior two-thirds of the intestine. This difference was relatively consistent between individual fish hosts. Worms from different parts of the gut did not differ in length, so site segregation was not obviously related to worm growth or age. We found proportionally more males in the caeca when a larger fraction of the females were found there, suggesting mating opportunities influence gut distribution. However, this result relied on a single parasite infrapopulation and is thus tentative. We discuss how mating strategies and/or sexual differences in life history might explain why males and females occupy different parts of the burbot gut.</div></front></TEI><affiliations><list><country><li>Finlande</li><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="Finlande"><noRegion><name sortKey="Tuomainen, Arto" sort="Tuomainen, Arto" uniqKey="Tuomainen A" first="Arto" last="Tuomainen">Arto Tuomainen</name></noRegion><name sortKey="Benesh, Daniel P" sort="Benesh, Daniel P" uniqKey="Benesh D" first="Daniel P" last="Benesh">Daniel P. Benesh</name><name sortKey="Tellervo Valtonen, E" sort="Tellervo Valtonen, E" uniqKey="Tellervo Valtonen E" first="E" last="Tellervo Valtonen">E. Tellervo Valtonen</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Benesh, Daniel P" sort="Benesh, Daniel P" uniqKey="Benesh D" first="Daniel P" last="Benesh">Daniel P. 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