Intermediate dispersal hypothesis of species diversity: New insights

Yamaguchi, Ryo

doi:10.1111/1440-1703.12313

Cited by 9 publications

(10 citation statements)

References 100 publications

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“…This pattern suggests that dispersal ability is a reliable indicator of gene flow. If dispersal abilities, or proxies thereof, are high, then species will tend towards panmixia (Yamaguchi, 2022). In contrast, lower dispersal abilities will result in populations subdividing across geographic barriers in the landscape (Yamaguchi, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…If dispersal abilities, or proxies thereof, are high, then species will tend towards panmixia (Yamaguchi, 2022). In contrast, lower dispersal abilities will result in populations subdividing across geographic barriers in the landscape (Yamaguchi, 2022). This association is most obvious in species occupying heterogeneous landscapes with many barriers to dispersal.…”

Section: Introductionmentioning

confidence: 99%

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Amazonian birds in more dynamic habitats have less population genetic structure and higher gene flow

et al. 2023

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Understanding the factors that govern variation in genetic structure across species is key to the study of speciation and population genetics. Genetic structure has been linked to several aspects of life history, such as foraging strategy, habitat association, migration distance, and dispersal ability, all of which might influence dispersal and gene flow. Comparative studies of population genetic data from species with differing life histories provide opportunities to tease apart the role of dispersal in shaping gene flow and population genetic structure. Here, we examine population genetic data from sets of bird species specialized on a series of Amazonian habitat types hypothesized to filter for species with dramatically different dispersal abilities: stable upland forest, dynamic floodplain forest, and highly dynamic riverine islands. Using genome-wide markers, we show that habitat type has a significant effect on population genetic structure, with species in upland forest, floodplain forest, and riverine islands exhibiting progressively lower levels of structure. Although morphological traits used as proxies for individual-level dispersal ability did not explain this pattern, population genetic measures of gene flow are elevated in species from more dynamic riverine habitats. Our results suggest that the habitat in which a species occurs drives the degree of population genetic structuring via its impact on long-term fluctuations in levels of gene flow, with species in highly dynamic habitats having particularly elevated gene flow. These differences in genetic variation across taxa specialized in distinct habitats may lead to disparate responses to environmental change or habitatspecific diversification dynamics over evolutionary time scales.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Amazonian birds in more dynamic habitats have less population genetic structure and higher gene flow

et al. 2023

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“…Spatial processes, such as how islands are geographically arranged, could be a third explanation for the observed patterns. This argument does not necessarily require invoking selection against dispersal ability, and it could easily arise with intermediate dispersal (Ashby et al, 2020; Yamaguchi, 2022). Most likely a great speciator pattern would arise from a combination of spatial, abiotic and biotic factors, but the relative importance of each factor is currently unknown.…”

Section: Discussionmentioning

confidence: 99%

Islands promote diversification within the silvereye clade: a phylogenomic analysis of a great speciator

Estandía,

Recalde,

Sendell-Price

et al. 2024

Preprint

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Geographic isolation plays a pivotal role in speciation by restricting gene flow between populations through distance or physical barriers. However, the speciation process is complex, influenced by the interplay between dispersal ability and geographic isolation, especially in “great speciators” – bird species present on multiple islands that, at the same time, have many subspecies. Comparing population differentiation in both continental and insular settings can help us to understand the importance of geographical context in the emergence of great speciators. The highly diverse white-eye family Zosteropidae includes several great speciators, including the silvereye (Zosterops lateralis) which consists of 16 subspecies, 11 occurring on islands. The distribution of the silvereye on the Australian continent and numerous southwest Pacific islands allows us to explore the influence of different forms of geographic isolation on population divergence. To do this, we conducted a comprehensive phylogenomic analysis of the silvereye and compared patterns of population divergence in insular versus continental silvereye populations. We estimate that the silvereye lineage emerged approximately 1.5 million years ago, followed by the split of the two main silvereye clades: Southern Melanesia and the broader South Pacific (encompassing Australia, New Zealand, and outlying islands). Continental populations show low genetic population structure, which suggests that they can overcome multiple forms of geographic barriers across long distances. In contrast, most island populations are highly structured even over relatively short distances. Divergence statistics further support the idea that water barriers lead to a higher population differentiation when compared to continental distances. Our results indicate that islands promote divergence and provide an empirical example of the geographical conditions that result in the emergence of great speciators.

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“…On the one hand, high dispersal ability allows species to expand and reach large range sizes rapidly, possibly reducing the influence of age on range expansion and size. On the other hand, high dispersal ability prevents speciation and, thereby, range splitting, by maintaining gene flow among populations (Mayr 1963, Yamaguchi 2022). Indeed, dispersal ability positively affects range size (Alzate & Onstein 2022), and we found that for all clades examined and for species of similar age, those with higher dispersal abilities had larger ranges than species with lower dispersal abilities (Fig.…”

Section: Geographical Constraints On the Relationship Between Evoluti...mentioning

confidence: 99%

The evolutionary age-range size relationship is modulated by insularity and dispersal in plants and animals

Alzate,

Rozzi,

Velasco

et al. 2023

Preprint

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Earth is home to millions of plant and animal species, with more than 40 thousand species facing extinction worldwide (Diaz et al. 2019). Species’ range size is particularly important in this context because it influences extinction risk (Purvis et al. 2000, Gaston & Fuller 2009), but the causes underlying the wide natural variation in range size remain poorly known. Here, we investigate how evolutionary age is related to present-day range size for over 25,000 species of mammals, birds, reptiles, amphibians, reef fishes, and plants. We show that, on average, older species have significantly larger ranges, but the effect of age on range size is modulated by clade, geographical context and dispersal ability. Specifically, age does not affect range size for island species, because islands limit dispersal and hence range size, regardless of species age. Furthermore, species from clades with high dispersal capabilities obtain large ranges faster, thereby further neutralizing the relationship between age and range size. Our results can help supporting global conservation priorities, by showing that species that are young, occupy islands, and/or are dispersal limited often have small ranges and therefore increased extinction risk.

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Intermediate dispersal hypothesis of species diversity: New insights

Cited by 9 publications

References 100 publications

Amazonian birds in more dynamic habitats have less population genetic structure and higher gene flow

Amazonian birds in more dynamic habitats have less population genetic structure and higher gene flow

Islands promote diversification within the silvereye clade: a phylogenomic analysis of a great speciator

The evolutionary age-range size relationship is modulated by insularity and dispersal in plants and animals

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