Population Connectivity and Traces of Mitochondrial Introgression in New Zealand Black-Billed Gulls (Larus bulleri)

Mischler, Claudia; Veale, Andrew J.; Stijn, Tracey Van; Bräuning, Rüdiger; McEwan, John C.; Maloney, Richard F.; Robertson, Bruce C.

doi:10.3390/genes9110544

Cited by 8 publications

(12 citation statements)

References 68 publications

(95 reference statements)

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“…The results from this population indicated that these samples had a high frequency of mtDNA haplotypes from Red-billed Gulls (six out of 26 samples, 23%). A recent study (Mischler et al 2018) collected 69 blood samples from 10 Black-billed Gull colonies in different parts of New Zealand. The study found that, overall, 16% showed mtDNA introgression.…”

Section: Why Does Hybridization Occur Among Masked Gulls?mentioning

confidence: 99%

“…The first documented account of interbreeding of the two New Zealand species of masked gulls was between five pairings of Red-billed Gulls Chroicocephalus novaehollandiae scopulinus and Black-billed Gulls Chroicocephalus bulleri at Lake Rotorua (Gurr 1967). More recently, mtDNA analysis of 69 adult Black-billed Gulls collected at 10 colonies at different localities revealed the presence of mtDNA haplotypes characteristic of Redbilled Gulls (Mischler et al 2018). This pattern can be explained by hybridization between the two species, though incomplete lineage sorting could not be excluded as an alternative mechanism.…”

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confidence: 99%

“…The rates of putative introgression among Black-billed Gull colonies with mtDNA typical of Red-billed Gulls.The information provided by Claudia Mischler is unpublished information pertaining to theMischler et al (2018) study.…”

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confidence: 99%

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Molecular evidence for introgressive hybridization in New Zealand masked gulls

Given

Mills

Momigliano

et al. 2022

Ibis

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We used mitochondrial DNA (mtDNA) gene sequences and nuclear microsatellite loci to investigate the extent and outcome of hybridization between the Black‐billed Gull Chroicocephalus bulleri and the Red‐billed Gull Chroicocephalus novaehollandiae scopulinus in New Zealand. Six of 26 sampled Black‐billed Gulls possessed mtDNA typical of Red‐billed Gulls, but allele frequencies at six polymorphic microsatellites provided little evidence of mixed ancestry expected in very recent hybrids. None of the Red‐billed Gulls sampled from different colonies possessed Black‐billed Gull mtDNA expected in the reciprocal cross, suggesting that hybridization in the two species typically occurs between female Red‐billed Gulls and Black‐billed Gull males. The lack of any hybrid signal in the nuclear loci indicates that there has been extensive backcrossing with Black‐billed Gulls, effectively diluting the Red‐billed Gull nuclear DNA contribution. Divergence of Red‐billed Gulls and Black‐billed Gulls occurred approximately 250 000 years ago, indicating that unsorted ancestral polymorphism is an unlikely alternative to hybridization. Comparing demographic models within an approximate Bayesian computation (ABC) framework, we confirm that the observed patterns cannot result from incomplete lineage sorting. Using an ABC random forest approach, we determined that the most likely model explaining the data is a recent introgression scenario, whereby unidirectional gene flow is re‐established following a period of strict isolation. The ability of Black‐billed and Red‐billed Gulls to successfully interbreed shows that despite significant differentiation (FST > 0.3), there has been insufficient time for the two species to develop complete reproductive isolation. The apparent one‐way transfer of Red‐billed Gull mtDNA into Black‐billed Gulls and extensive backcrossing argues against cytoplasmic–nuclear genome incompatibilities between the two species. We hypothesize that the specific mate recognition system cued on colours of soft parts normally functions to prevent hybridization, but that it can break down under demographic conditions where there is a shortage of available mates and a surplus of females in the Red‐billed Gull population. The high incidence of introgression in Black‐billed Gulls conflicts with field observations that interbreeding is extremely rare.

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Section: Why Does Hybridization Occur Among Masked Gulls?mentioning

confidence: 99%

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confidence: 99%

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Molecular evidence for introgressive hybridization in New Zealand masked gulls

Given

Mills

Momigliano

et al. 2022

Ibis

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“…Mitochondrial DNA (mtDNA) differs from nuclear data in that it represents a short (15-20,000 base pairs (bp)), circular sequence of DNA (the mitogenome) that is maternally inherited, and found as 10-1000s of copies present in most cells of an individual (O'Hara et al, 2019). These properties make mtDNA useful independently or in combination with nuclear genetic markers for broad-scale comparisons of population-level diversity and differentiation (Alexander et al, 2016;Chapple et al, 2012;Mischler et al, 2018), taxonomic delimitation and phylogenetic inferences (Banker et al, 2017;Boon et al, 2000;Rosenbaum et al, 2017), and for investigating potential drivers of extinction, including in ancient DNA analysis (Allentoft et al, 2014…”

Section: Mitochondrial Datamentioning

confidence: 99%

Current applications and future promise of genetic/genomic data for conservation in an Aotearoa New Zealand context

Forsdick¹,

Adams²,

Alexander³

et al. 2021

Preprint

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1.To achieve the vision outlined in the national strategy for biodiversity, Te Mana o te Taiao, we will need to unite diverse disciplines, including conservation genetics/genomics.2.As conservation genetic/genomic data generated for—and associated with—taonga (treasured) species is also taonga, we highlight the need for collaborative research partnerships that centre the needs, aspirations and expertise of mana whenua.3.As a team of predominantly early-career conservation genetics and genomics researchers working across institutions as Te Tiriti o Waitangi partners, each speaking to our own expertise, we review available and emerging tools in the conservation genetics/genomics toolbox.4.To support practitioners in identifying appropriate and affordable tools from the toolbox, we present a table that encompasses resource requirements (including finances, time, and skill) to assist conservation practitioners in assessing the associated costs and benefits of these tools for informing conservation management.5.To support researchers and practitioners in establishing long-lasting partnerships with mana whenua, we highlight key aspects of data management and data sovereignty for consideration.6.Intended as a platform to initiate discussion within and among conservation practitioners and researchers, mana whenua, and local communities, the development of government policies is beyond the scope of this contribution.7.To meet the vision of Te Mana o te Taiao, we conclude by calling for a transdisciplinary approach that includes conservation genetics/genomics.

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“…In other cases, broader phylogenetic understanding of a group can directly inform different kinds of conservation practice and measures [4,9]. Expanded analyses of historical and ancient DNA now afford novel opportunities for better understanding relevant processes, including contemporary and past hybridization [10][11][12]. In addition, metagenomics and environmental (e)DNA allow for broader access to genetically sample ecosystems in new and rapid ways [13][14][15].…”

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confidence: 99%