Body size and shape evolution in host races of the tick Ixodes uriae
The tick Ixodes uriae is a common ectoparasite of seabirds, and is widely distributed across the circumpolar regions of both hemispheres. Previous work demonstrated the existence of genetically distinct host races of this ectoparasite, occurring across its current range. The objective of the present...
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ftird:oai:ird.fr:fdi:010058950 2023-05-15T17:33:51+02:00 Body size and shape evolution in host races of the tick Ixodes uriae Dietrich, M. Beati, L. Elguero, Eric Boulinier, T. McCoy, K. D. NORVEGE 2013 http://www.documentation.ird.fr/hor/fdi:010058950 EN eng http://www.documentation.ird.fr/hor/fdi:010058950 oai:ird.fr:fdi:010058950 Dietrich M., Beati L., Elguero Eric, Boulinier T., McCoy K. D. Body size and shape evolution in host races of the tick Ixodes uriae. Biological Journal of the Linnean Society, 2013, 108 (2), p. 323-334. adaptation bird morphometry parasite sympatric speciation text 2013 ftird 2020-08-21T06:54:44Z The tick Ixodes uriae is a common ectoparasite of seabirds, and is widely distributed across the circumpolar regions of both hemispheres. Previous work demonstrated the existence of genetically distinct host races of this ectoparasite, occurring across its current range. The objective of the present study was to examine whether these host races have evolved measurable morphological differences. We measured a set of morphological variables on 255 non-engorged ticks (nymphs and adults) collected from three sympatrically occurring host species in the North Atlantic. Genotyping at eight microsatellite markers enabled us to analyse the relationship between patterns of morphological and neutral genetic variation. Multivariate analyses showed that most morphological variation was associated with size differences among tick individuals. Body size differed among races, but only in adult life stages. A linear discriminant analysis based on shape variation revealed three distinct morphological clusters corresponding to the three tick host races. These results, along with correlated patterns of host-related genetic variation, suggest that differences among host-related groups are not simply the result of phenotypic plasticity or drift, but rather reflect host-associated adaptations. Experimental work and observations across the range of I.?uriae will now be required to test the genetic basis and adaptive nature of morphological differences. Text North Atlantic IRD (Institute de recherche pour le développement): Horizon |
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IRD (Institute de recherche pour le développement): Horizon |
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language |
English |
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adaptation bird morphometry parasite sympatric speciation |
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adaptation bird morphometry parasite sympatric speciation Dietrich, M. Beati, L. Elguero, Eric Boulinier, T. McCoy, K. D. Body size and shape evolution in host races of the tick Ixodes uriae |
topic_facet |
adaptation bird morphometry parasite sympatric speciation |
description |
The tick Ixodes uriae is a common ectoparasite of seabirds, and is widely distributed across the circumpolar regions of both hemispheres. Previous work demonstrated the existence of genetically distinct host races of this ectoparasite, occurring across its current range. The objective of the present study was to examine whether these host races have evolved measurable morphological differences. We measured a set of morphological variables on 255 non-engorged ticks (nymphs and adults) collected from three sympatrically occurring host species in the North Atlantic. Genotyping at eight microsatellite markers enabled us to analyse the relationship between patterns of morphological and neutral genetic variation. Multivariate analyses showed that most morphological variation was associated with size differences among tick individuals. Body size differed among races, but only in adult life stages. A linear discriminant analysis based on shape variation revealed three distinct morphological clusters corresponding to the three tick host races. These results, along with correlated patterns of host-related genetic variation, suggest that differences among host-related groups are not simply the result of phenotypic plasticity or drift, but rather reflect host-associated adaptations. Experimental work and observations across the range of I.?uriae will now be required to test the genetic basis and adaptive nature of morphological differences. |
format |
Text |
author |
Dietrich, M. Beati, L. Elguero, Eric Boulinier, T. McCoy, K. D. |
author_facet |
Dietrich, M. Beati, L. Elguero, Eric Boulinier, T. McCoy, K. D. |
author_sort |
Dietrich, M. |
title |
Body size and shape evolution in host races of the tick Ixodes uriae |
title_short |
Body size and shape evolution in host races of the tick Ixodes uriae |
title_full |
Body size and shape evolution in host races of the tick Ixodes uriae |
title_fullStr |
Body size and shape evolution in host races of the tick Ixodes uriae |
title_full_unstemmed |
Body size and shape evolution in host races of the tick Ixodes uriae |
title_sort |
body size and shape evolution in host races of the tick ixodes uriae |
publishDate |
2013 |
url |
http://www.documentation.ird.fr/hor/fdi:010058950 |
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NORVEGE |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010058950 oai:ird.fr:fdi:010058950 Dietrich M., Beati L., Elguero Eric, Boulinier T., McCoy K. D. Body size and shape evolution in host races of the tick Ixodes uriae. Biological Journal of the Linnean Society, 2013, 108 (2), p. 323-334. |
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