Coalescent Modelling Suggests Recent Secondary-Contact of Cryptic Penguin Species

Grosser, Stefanie; Burridge, Christopher P.; Peucker, Amanda J.; Waters, Jonathan M.

doi:10.1371/journal.pone.0144966

Cited by 37 publications

(45 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This recent timeframe is also supported by coalescent analysis of microsatellite genotypes [26]. Additionally, the current Bayesian modelling suggests an initial decline of E. minor around the time of E. novaehollandiae colonization.…”

Section: Discussionsupporting

confidence: 70%

Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins

et al. 2016

Self Cite

View full text Add to dashboard Cite

The expansion of humans into previously unoccupied parts of the globe is thought to have driven the decline and extinction of numerous vertebrate species. In New Zealand, human settlement in the late thirteenth century AD led to the rapid demise of a distinctive vertebrate fauna, and also a number of 'turnover' events where extinct lineages were subsequently replaced by closely related taxa. The recent genetic detection of an Australian little penguin (Eudyptula novaehollandiae) in southeastern New Zealand may potentially represent an additional 'cryptic' invasion. Here we use ancient-DNA (aDNA) analysis and radiocarbon dating of pre-human, archaeological and historical Eudyptula remains to reveal that the arrival of E. novaehollandiae in New Zealand probably occurred between AD 1500 and 1900, following the anthropogenic decline of its sister taxon, the endemic Eudyptula minor. This rapid turnover event, revealed by aDNA, suggests that native species decline can be masked by invasive taxa, and highlights the potential for human-mediated biodiversity shifts.

show abstract

Section: Discussionsupporting

confidence: 70%

Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Little penguins are the only mainland species in Australia; they are also found on the New Zealand mainland. Recent research suggests that Australian and New Zealand little penguins are separate species (Grosser et al 2015). This may have implications for conservation status and actions, but since the little penguin is formally recognised as a single species at the time of writing (BirdLife International 2017b), we consider it here as a single species.…”

Section: Australasiamentioning

confidence: 99%

“…However, if little penguins are split into separate New Zealand and Australian species (Grosser et al 2015), this would increase conservation concern and therefore the relative priority of the bycatch issue.…”

Section: Moderate Riskmentioning

confidence: 99%

Tangled and drowned: a global review of penguin bycatch in fisheries

Crawford¹,

Ellenberg²,

Frere³

et al. 2017

Endang. Species. Res.

View full text Add to dashboard Cite

“…with a composite dataset of mtCR and nuclear microsatellites.IMa2 estimates six demographic parameters for population pairs: two descendent and one ancestral population sizes (θ 0 , θ 1 and θ 2 ), two migration rates (m 0 and m 1 ), and the population splitting time (t). These initial runs were used as the starting state for ten additional independent runs starting from different random number seeds with 3 × 10 5 burn-in steps and 10 6 run steps (e.g.,Grosser, Burridge, Peucker, & Waters, 2015). An HKY model of sequence evolution was used for the mtCR locus, and the stepwise mutation model (SSM) was employed for microsatellite loci.Preliminary runs of 3-10 × 10 6 steps were conducted to evaluate Markov chain Monte Carlo (MCMC) mixing and upper bounds of model parameter priors.…”

mentioning

confidence: 99%

Navigating the southern seas with small fins: Genetic connectivity of seahorses (Hippocampus abdominalis) across the Tasman Sea

Ashe

Wilson

2019

Journal of Biogeography

View full text Add to dashboard Cite

Aim: Historical patterns of ocean circulation in the Southern Hemisphere have been well-studied, but the effects of coastal oceanography on marine biogeography in this region remain poorly understood relative to northern latitudes. Our study investigates historical and contemporary patterns of migration and dispersal across the Tasman Sea.Location: Coastal regions of the Tasman Sea including southeastern Australia, Tasmania and New Zealand.Taxon: Hippocampus abdominalis, the pot-bellied seahorse, one of the most broadly distributed seahorse species, and the only seahorse to have successfully colonized New Zealand from Australia across 2,000 km of open ocean. Methods:We used a multilocus genetic dataset to measure population diversity and differentiation from seahorses across the full species range to investigate contemporary and historical demography, and to reconstruct colonization routes across the Tasman Sea. Results:Genetic data indicate that seahorses colonized New Zealand from Australia during the previous interglacial-glacial cycle (12,000-120,000 ybp), and have evolved in relative isolation since the initial establishment event. Contemporary effective population sizes in the newly colonized range are substantially larger than those inferred in Australia, and both appear to be reduced relative to ancestral levels. Australian seahorses are genetically diverse and show high levels of population connectivity, while the distribution of genetic variation in New Zealand suggests an initial colonization of the South Island following by northward migration. Importantly, despite clear evidence that New Zealand seahorses are descendent from Australian ancestors, patterns of contemporary genetic diversity are consistent with trans-Tasman migration from New Zealand to Australia, suggesting that genetic variation accumulated in the newly colonized range may be contributing to the genetic diversity of Australian seahorses.Main conclusions: Despite a largely independent evolutionary trajectory of seahorses separated by the Tasman Sea, haplotype sharing between populations in Australia and New Zealand suggests that secondary genetic exchange is contributing to the contemporary phylogeography of the species. Patterns of genetic structure in H. abdominalis mirror those found in other rafting species, suggesting that adult dispersal via rafting has been an important vector of marine dispersal in this species. 197

show abstract

Coalescent Modelling Suggests Recent Secondary-Contact of Cryptic Penguin Species

Cited by 37 publications

References 69 publications

Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins

Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins

Tangled and drowned: a global review of penguin bycatch in fisheries

Navigating the southern seas with small fins: Genetic connectivity of seahorses (Hippocampus abdominalis) across the Tasman Sea

Contact Info

Product

Resources

About