The influence of climatic variation and density on the survival of an insular passerine Zosterops lateralis

Sandvig, Erik M.; Coulson, Tim; Kikkawa, Jiro; Clegg, Sonya M.

doi:10.1371/journal.pone.0176360

Cited by 11 publications

(10 citation statements)

References 73 publications

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“…The mean population fitness (λ) was obtained by multiplying the average number of fledglings of observed clutches by the mean survival during the summer, autumn and winter of young individuals along with the generation time (Table S1). These parameter values were obtained from literature ( Kikkawa and Wilson 1983 , Brook and Kikkawa 1998 , Clegg et al 2002b , Sandvig et al 2017 ). Male fitness was then scaled such that the total sum of male fitness equalled the total sum of female fitness.…”

Section: Methodsmentioning

confidence: 99%

The Genomic Landscape of Divergence Across the Speciation Continuum in Island-Colonising Silvereyes (Zosterops lateralis)

Sendell‐Price

Ruegg

Anderson

et al. 2020

G3 Genes|Genomes|Genetics

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Inferring the evolutionary dynamics at play during the process of speciation by analysing the genomic landscape of divergence is a major pursuit in population genomics. However, empirical assessments of genomic landscapes under varying evolutionary scenarios that are known a priori are few, thereby limiting our ability to achieve this goal. Here we combine RAD-sequencing and individual-based simulations to evaluate the genomic landscape of divergence in the silvereye (Zosterops lateralis). Using pairwise comparisons that differ in divergence timeframe and the presence or absence of gene flow, we document how genomic patterns accumulate along the speciation continuum. In contrast to previous predictions, our results provide limited support for the idea that divergence accumulates around loci under divergent selection or that genomic islands widen with time. While a small number of genomic islands were found in populations diverging with and without gene flow, in few cases were SNPs putatively under selection tightly associated with genomic islands. The transition from localised to genome-wide levels of divergence was captured using individual-based simulations that considered only neutral processes. Our results challenge the ubiquity of existing verbal models that explain the accumulation of genomic differences across the speciation continuum and instead support the idea that divergence both within and outside of genomic islands is important during the speciation process.

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Section: Methodsmentioning

confidence: 99%

The Genomic Landscape of Divergence Across the Speciation Continuum in Island-Colonising Silvereyes (Zosterops lateralis)

Sendell‐Price

Ruegg

Anderson

et al. 2020

G3 Genes|Genomes|Genetics

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“…Sandvig et al. () found that survival of Zosteropos lateralis on a small island near Australia was indeed correlated to climatic (rainfall) variables. Additionally, Olson et al.…”

Section: Discussionmentioning

confidence: 99%

“…The climatic variation between the species' habitats should favor unique morphological and physiological adaptations, and it is possible that hybrids would suffer from being poorly adapted to either environment. Sandvig et al (2017) found that survival of Zosteropos lateralis on a small island near Australia was indeed correlated to climatic (rainfall) variables. Additionally, Olson et al (2010) found that hybrid chickadees (hybrids of Poecile atricapillus and Poecile carolinensis) had reduced metabolic efficiency compared to their parental species, and suggested that genetic incompatibilities between mismatched mtDNA and nuclear DNA could have severe physiological costs in hybrid birds.…”

Section: Reproductive Barriersmentioning

confidence: 93%

Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

Cowles

2019

Evolution

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Examining what happens when two closely related species come into secondary contact provides insight into the later stages of the speciation process. The Zosteropidae family of birds is one of the most rapidly speciating vertebrate lineages. Members of this family are highly vagile and geographically widespread, raising the question of how divergence can occur if populations can easily come into secondary contact. On the small island of Kolombangara, two closely related nonsister species of white‐eyes, Zosterops kulambangrae and Zosterops murphyi, are distributed along an elevational gradient and come into secondary contact at mid‐elevations. We captured 134 individuals of both species along two elevational transects. Using genotyping‐by‐sequencing data and a mitochondrial marker, we found no evidence of past hybridization events and strong persistence of species boundaries, even though the species have only been diverging for approximately 2 million years. We explore potential reproductive barriers that allow the two species to coexist in sympatry, including premating isolation based on divergence in plumage and song. We also conducted a literature review to determine the time it takes to evolve complete reproductive isolation in congeneric avian species/subspecies in secondary contact (restricted to cases where congeneric taxa are parapatric or have a hybrid zone), finding our study is one of the youngest examples of complete reproductive isolation studied in a genomic context reported in birds.

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“…2019). In contrast, in areas of high rainfall, such as the Cape Horn rainforests, very high levels of rainfall can limit the habitat use of birds (Santillan et al 2018) and decrease chick survival (Sandvig et al 2017;Schöll and Hille 2020). In places with extremely high rainfall, a decrease in structural complexity of forests could also influence a lower species richness (Rozzi et al 2007).…”

Section: The Impact Of Increasing Precipitation On the Hygric Nichementioning

confidence: 99%

The extreme rainfall gradient of the Cape Horn Biosphere Reserve and its impact on forest bird richness

et al. 2022

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A natural laboratory is a place supporting the conditions for hypothesis testing under non-anthropogenic settings. Located at the southern end of the Magellanic sub-Antarctic ecoregion in southwestern South America, the Cape Horn Biosphere Reserve (CHBR) has one of the most extreme rainfall gradients in the world. Subject to oceanic climate conditions, it is also characterized by moderate thermal fluctuations throughout the year. This makes it a unique natural laboratory for studying the effects of extreme rainfall variations on forest bird communities. Here, we monitor the bird species richness in the different forest types present in the CHBR. We found that species richness decreased with increasing precipitation, in which an increase of 100 mm in average annual precipitation showed about 1% decrease in species richness. Similar patterns were found among different forest types within the CHBR. These results provide a baseline to investigate the interactions between physical and biotic factors in a subpolar region that climatically contrasts with boreal forests, which is subject to continental climatic conditions. This research highlights the importance of ecological and ornithological long-term studies in the CHBR, which can contribute both to a higher resolution of the heterogeneity of climate changes in different regions of the world, and to orient conservation policies in the Magellanic sub-Antarctic ecoregion in the face of growing development pressures.

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The influence of climatic variation and density on the survival of an insular passerine Zosterops lateralis

Cited by 11 publications

References 73 publications

The Genomic Landscape of Divergence Across the Speciation Continuum in Island-Colonising Silvereyes (Zosterops lateralis)

The Genomic Landscape of Divergence Across the Speciation Continuum in Island-Colonising Silvereyes (Zosterops lateralis)

Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

The extreme rainfall gradient of the Cape Horn Biosphere Reserve and its impact on forest bird richness

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