Genetic, Morphological, and Acoustic Evidence Reveals Lack of Diversification in the Colonization Process in an Island Bird

Illera, Juan Carlos; Palmero, Ana María; Laiolo, Paola; Rodríguez, Fernando Martín; Moreno, Ángel C.; Navascués, Miguel

doi:10.1111/evo.12429

Cited by 24 publications

(37 citation statements)

References 92 publications

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“…Following other approaches (e.g. Illera et al., ), three demographic models were compared and demographic parameters for the best model were estimated. The analyses focused on comparing the Ekalluk and Lauchlan samples and then the Ekalluk and Halokvik samples to limit computational demands.…”

Section: Methodsmentioning

confidence: 99%

Genomics and telemetry suggest a role for migration harshness in determining overwintering habitat choice, but not gene flow, in anadromous Arctic Char

et al. 2017

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Migration is a ubiquitous life history trait with profound evolutionary and ecological consequences. Recent developments in telemetry and genomics, when combined, can bring significant insights on the migratory ecology of nonmodel organisms in the wild. Here, we used this integrative approach to document dispersal, gene flow and potential for local adaptation in anadromous Arctic Char from six rivers in the Canadian Arctic. Acoustic telemetry data from 124 tracked individuals indicated asymmetric dispersal, with a large proportion of fish (72%) tagged in three different rivers migrating up the same short river in the fall. Population genomics data from 6,136 SNP markers revealed weak, albeit significant, population differentiation (average pairwise F = 0.011) and asymmetric dispersal was also revealed by population assignments. Approximate Bayesian computation simulations suggested the presence of asymmetric gene flow, although in the opposite direction to that observed from the telemetry data, suggesting that dispersal does not necessarily lead to gene flow. These observations suggested that Arctic Char home to their natal river to spawn, but may overwinter in rivers with the shortest migratory route to minimize the costs of migration in nonbreeding years. Genome scans and genetic-environment associations identified 90 outlier markers putatively under selection, 23 of which were in or near a gene. Of these, at least four were involved in muscle and cardiac function, consistent with the hypothesis that migratory harshness could drive local adaptation. Our study illustrates the power of integrating genomics and telemetry to study migrations in nonmodel organisms in logistically challenging environments such as the Arctic.

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Section: Methodsmentioning

confidence: 99%

Genomics and telemetry suggest a role for migration harshness in determining overwintering habitat choice, but not gene flow, in anadromous Arctic Char

et al. 2017

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“…Sampling was carried out at multiple localities within each site (except in North Africa where only one locality was surveyed; Figs 1 & 2), to avoid bias related to intra‐site pathogen structure (González‐Quevedo et al ., ). Most birds were caught during 2010 and 2011 (see Illera et al ., ), with extra samples collected during 2012 and 2013 in La Palma ( n = 7), the Iberian Peninsula ( n = 22) and Fuerteventura ( n = 6). All birds (22–54 per site; Table ) were trapped using mist nets during the breeding period, and they were kept in clean individual ringing bags until they were ringed.…”

Section: Methodsmentioning

confidence: 99%

“…This bird inhabits temperate to tropical latitudes across geographically disjunct and patchy populations in the Mediterranean Basin, and has colonized three oceanic archipelagos in the Atlantic. In addition, the spectacled warbler populations in Macaronesia have only recently been founded in the last 10,000 years (Illera et al ., ). Such a model offers an ideal opportunity to test biogeographical hypotheses about variation in prevalence, loss and gain of parasite species, and associations between groups of pathogens, in a recent colonizer.…”

Section: Introductionmentioning

confidence: 97%

Unforeseen biogeographical patterns in a multiple parasite system in Macaronesia

Illera

Fernández-Álvarez

Hernández-Flores

et al. 2015

Journal of Biogeography

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Aim Understanding the reasons why hosts lose, maintain or swap their parasite burden after colonizing new areas has long intrigued island biogeographers. Using molecular markers, we evaluated parasite biogeography of a multiple parasite system of Apicomplexa protozoans (haemosporidian and coccidian parasites) showing different modes of transmission in the spectacled warbler (Sylvia conspicillata), a small passerine with recently founded populations in Macaronesia.Location Twelve oceanic islands of three Macaronesian archipelagos (Madeira, the Canary Islands and Cape Verde) and two continental areas (the Iberian Peninsula and Morocco).Methods We amplified and sequenced fragments of the parasite mitochondrial genome (cytochrome b for haemosporidian and cytochrome c oxidase subunit I for coccidian parasites) to determine the prevalence, richness, diversity and associations between groups of pathogens from the continental sources to the Macaronesian islands. We also built a haplotype network for the coccidian parasites to obtain insights on their evolutionary history. ResultsWe did not find a significant reduction in parasite diversity in the Macaronesian islands compared with the mainland. The prevalence was higher in Macaronesia for both parasite groups than on the mainland, although it was only significant for the haemosporidian parasites. The haplotype network revealed an unexpectedly strong differentiation in the coccidia, with a similar structure to the haplotype topology previously found in the host.Main conclusions Oceanic islands provide model systems for disentangling geographical origins, colonization pathways, and diversification of avian hosts through analysis of parasites. We show that analysis of coccidians, which closely track the evolutionary history of their avian hosts, may illuminate co-speciation processes in both groups. Our results show that coccidian populations in Macaronesia are highly structured but fail to provide support for the predicted impoverishment of parasite assemblages on islands.

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“…Migration between continental islands and the mainland may be more common, while species on oceanic islands that exist along an archipelago can exhibit gene flow among adjacent islands (Illera et al, 2007;Clegg and Phillimore, 2010;Illera et al, 2014;Bell et al, 2015a, b). This distinction is a generalization; the migration levels in both oceanic and continental islands will depend on the dispersal ability of particular colonizing organisms and the degree to which marine environments act as barriers to dispersal.…”

Section: Introductionmentioning

confidence: 99%

Vicariance and marine migration in continental island populations of a frog endemic to the Atlantic Coastal forest

2015

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The theory of island biogeography is most often studied in the context of oceanic islands where all island inhabitants are descendants from founding events involving migration from mainland source populations. Far fewer studies have considered predictions of island biogeography in the case of continental islands, where island formation typically splits continuous populations and thus vicariance also contributes to the diversity of island populations. We examined one such case on continental islands in southeastern Brazil, to determine how classic island biogeography predictions and past vicariance explain the population genetic diversity of Thoropa taophora, a frog endemic to the Atlantic Coastal Forest. We used nuclear microsatellite markers to examine the genetic diversity of coastal and island populations of this species. We found that island isolation has a role in shaping the genetic diversity of continental island species, with island populations being significantly less diverse than coastal populations. However, area of the island and distance from coast had no significant effect on genetic diversity. We also found no significant differences between migration among coastal populations and migration to and from islands. We discuss how vicariance and the effects of continued migration between coastal and island populations interact to shape evolutionary patterns on continental islands.

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Genetic, Morphological, and Acoustic Evidence Reveals Lack of Diversification in the Colonization Process in an Island Bird

Cited by 24 publications

References 92 publications

Genomics and telemetry suggest a role for migration harshness in determining overwintering habitat choice, but not gene flow, in anadromous Arctic Char

Genomics and telemetry suggest a role for migration harshness in determining overwintering habitat choice, but not gene flow, in anadromous Arctic Char

Unforeseen biogeographical patterns in a multiple parasite system in Macaronesia

Vicariance and marine migration in continental island populations of a frog endemic to the Atlantic Coastal forest

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