Melanie
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Zosteropidae (1 Viewer)
- Thread starter Peter Kovalik
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MJB
Well-known member
Jim LeNomenclatoriste
Je suis un mignon petit Traquet rubicole
Melanie
Well-known member
It took nineteen years from the discovery to the description according the Wangi-wangi white-eye
albertonykus
Well-known member
Vinciguerra, N.T., C.H. Oliveros, R.G. Moyle, and M.J. Andersen (2022)
Island life accelerates geographical radiation in the white-eyes (Zosteropidae)
Ibis (advance online publication)
doi: 10.1111/ibi.13177
White-eyes are an iconic avian radiation of small passerines that are mainly distributed across the eastern hemisphere tropics and subtropics. Species diversity of white-eyes is particularly high on oceanic islands, and many species are restricted to single islands or island groups. The high rate of species diversification of white-eyes ranks them among the fastest radiations known in birds, but whether their accelerated diversification was the result of repeatedly colonizing islands remains unexplored. We used a newly estimated timetree for nearly all zosteropids and phylogenetic comparative methods to estimate and compare diversification rates between island and continental lineages. We show that island white-eyes have similar extinction rates, yet higher speciation rates compared with continental white-eyes. In addition, we find higher rates of transitions from islands to continents. Our results show the importance of islands, such as Wallacean and Melanesian archipelagos of the Indo-Pacific, in facilitating high rates of speciation within this remarkable clade.
Island life accelerates geographical radiation in the white-eyes (Zosteropidae)
Ibis (advance online publication)
doi: 10.1111/ibi.13177
White-eyes are an iconic avian radiation of small passerines that are mainly distributed across the eastern hemisphere tropics and subtropics. Species diversity of white-eyes is particularly high on oceanic islands, and many species are restricted to single islands or island groups. The high rate of species diversification of white-eyes ranks them among the fastest radiations known in birds, but whether their accelerated diversification was the result of repeatedly colonizing islands remains unexplored. We used a newly estimated timetree for nearly all zosteropids and phylogenetic comparative methods to estimate and compare diversification rates between island and continental lineages. We show that island white-eyes have similar extinction rates, yet higher speciation rates compared with continental white-eyes. In addition, we find higher rates of transitions from islands to continents. Our results show the importance of islands, such as Wallacean and Melanesian archipelagos of the Indo-Pacific, in facilitating high rates of speciation within this remarkable clade.
jurek
Well-known member
I wonder what independent measure of radiation they used?
Because the result can be interpreted "birds on islands are more likely to evolve into new taxa" or "Ornithologists are more likely to call birds on islands as new taxa".
Jim LeNomenclatoriste
Je suis un mignon petit Traquet rubicole
You have the paper ?I wonder what independent measure of radiation they used?
Because the result can be interpreted "birds on islands are more likely to evolve into new taxa" or "Ornithologists are more likely to call birds on islands as new taxa".
Jacana
Will Jones
Candidate gene length polymorphisms are linked to dispersive behaviour: searching for a mechanism behind the "paradox of the great speciators"
Andrea Estandia, Ashley T. Sendell-Price, Graeme Oatley, Fiona Robertson, Dominique Potvin, Melanie Massaro, Bruce C. Robertson, Sonya M. Clegg
bioRxiv 2023.01.19.524190; doi: Candidate gene length polymorphisms are linked to dispersive behaviour: searching for a mechanism behind the "paradox of the great speciators"
The "paradox of the great speciators" has puzzled evolutionary biologists for over half a century. A great speciator requires excellent dispersal ability to explain its occurrence on multiple islands, but reduced dispersal ability to explain its high number of subspecies. A rapid reduction in dispersal ability is often invoked to solve this apparent paradox, but a proximate mechanism has not been identified. Here, we explore the role of six genes linked to migration and animal personality differences (CREB1, CLOCK, ADCYAP1, NPAS2, DRD4, and SERT) in 20 South Pacific populations of silvereye (Zosterops lateralis) that range from highly sedentary to partially migratory, to determine if genetic variation is associated with dispersal propensity. We detected genetic associations in three of the six genes: i) in a partial migrant population, migrant individuals had longer microsatellite alleles at the CLOCK gene compared to resident individuals from the same population; ii) CREB1 displayed longer average microsatellite allele lengths in recently colonised island populations (< 200 years), compared to evolutionarily older populations. Bayesian broken stick regression models supported a reduction in CREB1 length with time since colonisation and decreasing dispersal propensity; and iii) like CREB1, DRD4 showed differences in polymorphisms between recent and old colonisations but a further sample size is needed to confirm. ADCYAP1, SERT, and NPAS2 were variable but that variation was not associated with dispersal propensity. The association of genetic variants at three genes with migration and dispersal ability in silvereyes provides the impetus for further exploration of genetic mechanisms underlying dispersal shifts, and the prospect of resolving a long-running evolutionary paradox through a genetic lens.
Andrea Estandia, Ashley T. Sendell-Price, Graeme Oatley, Fiona Robertson, Dominique Potvin, Melanie Massaro, Bruce C. Robertson, Sonya M. Clegg
bioRxiv 2023.01.19.524190; doi: Candidate gene length polymorphisms are linked to dispersive behaviour: searching for a mechanism behind the "paradox of the great speciators"
The "paradox of the great speciators" has puzzled evolutionary biologists for over half a century. A great speciator requires excellent dispersal ability to explain its occurrence on multiple islands, but reduced dispersal ability to explain its high number of subspecies. A rapid reduction in dispersal ability is often invoked to solve this apparent paradox, but a proximate mechanism has not been identified. Here, we explore the role of six genes linked to migration and animal personality differences (CREB1, CLOCK, ADCYAP1, NPAS2, DRD4, and SERT) in 20 South Pacific populations of silvereye (Zosterops lateralis) that range from highly sedentary to partially migratory, to determine if genetic variation is associated with dispersal propensity. We detected genetic associations in three of the six genes: i) in a partial migrant population, migrant individuals had longer microsatellite alleles at the CLOCK gene compared to resident individuals from the same population; ii) CREB1 displayed longer average microsatellite allele lengths in recently colonised island populations (< 200 years), compared to evolutionarily older populations. Bayesian broken stick regression models supported a reduction in CREB1 length with time since colonisation and decreasing dispersal propensity; and iii) like CREB1, DRD4 showed differences in polymorphisms between recent and old colonisations but a further sample size is needed to confirm. ADCYAP1, SERT, and NPAS2 were variable but that variation was not associated with dispersal propensity. The association of genetic variants at three genes with migration and dispersal ability in silvereyes provides the impetus for further exploration of genetic mechanisms underlying dispersal shifts, and the prospect of resolving a long-running evolutionary paradox through a genetic lens.
Jim LeNomenclatoriste
Je suis un mignon petit Traquet rubicole
GEORGE SANGSTER, NICHOLAS T. VINCIGUERRA, JIMMY GAUDIN, MICHAEL J. ANDERSEN (2023). A new genus for Dasycrotapha plateni and D. pygmaea (Aves: Zosteropidae). Zootaxa 5361(1): 145-148.
No abstract available.
Stictocerthia new genus
No abstract available.
Stictocerthia new genus
Jacana
Will Jones
Andrea Estandia, Nilo Merino Recalde, Ashley T. Sendell-Price, Dominique A. Potvin, Bruce C. Robertson, Sonya M. Clegg. Islands promote diversification within the silvereye clade: a phylogenomic analysis of a great speciator
bioRxiv 2024.03.11.584438; doi: Islands promote diversification within the silvereye clade: a phylogenomic analysis of a great speciator
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.
bioRxiv 2024.03.11.584438; doi: Islands promote diversification within the silvereye clade: a phylogenomic analysis of a great speciator
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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